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Saadah Abdul Rahman - One of the best experts on this subject based on the ideXlab platform.
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cellulose micro nanofibres of merbau Intsia bijuga waste effects of chemical treatments on structural and morphology features
Asian Journal of Chemistry, 2018Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was isolated at atmospheric pressure. In the first stage, the samples were delignified using peroxyacetic acid to remove the amorphous structure. In the second stage, the samples were double-bleached using hydrogen peroxide and sodium hydroxide. The morphology of the cellulose samples was compared. From the X-ray diffraction (XRD) data, it is evident that both acid and alkali bleached celluloses have rich cellulose I structure.
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Cellulose Micro/Nanofibres of Merbau (Intsia bijuga) Waste: Effects of Chemical Treatments on Structural and Morphology Features
Asian Journal of Chemistry, 2017Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was isolated at atmospheric pressure. In the first stage, the samples were delignified using peroxyacetic acid to remove the amorphous structure. In the second stage, the samples were double-bleached using hydrogen peroxide and sodium hydroxide. The morphology of the cellulose samples was compared. From the X-ray diffraction (XRD) data, it is evident that both acid and alkali bleached celluloses have rich cellulose I structure.
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Effect of Chemical Treatment on Crystalline Cellulose: Changes in Crystallinity and Functional Groups of Cellulose
Advanced Materials Research, 2015Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Noriean Azraaie, Nurul Aimi Mohd Zainul Abidin, Nur Ain Ibrahim, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was extracted at atmospheric pressure. In the initial stage the sample was delignified using peroxyacetic acid to remove the amorphous. In the second stage the samples were double bleached using hydrogen peroxide (H2O2) and sodium Hydroxide (NaOH). From the X-Ray Diffraction (XRD) data it is evident that both acid and alkali bleached celluloses have rich cellulose I structure. The results are supported by FTIR study in which all samples shown typical spectra of cellulose.
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Preparation and XRD Analysis of Cellulose from Merbau (Intsia bijuga)
Advanced Materials Research, 2014Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Noriean Azraaie, Nurul Aimi Mohd Zainul Abidin, Nur Ain Ibrahim, Saadah Abdul RahmanAbstract:Hardwood is from angiosperm trees. The characteristic of woods include flower, endosperm within seeds and the production of fruits that contain the seeds. This paper aim is to discuss the preparation and characterization the cellulose obtained from hardwood and the analysis of the cellulose from x-ray diffraction result. The hardwood Merbau (Intsia bijuga) was chosen as raw material in this study. Ethanol toluene, lignin and holocellulose extraction methods were used for the preparation of cellulose while acid hydrolysis was used to produce the cellulose nanocrystal (CNC). The untreated (pure hardwood Merbau) and cellulose samples were characterized using XRD. The final products from all samples were then compared.
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Preliminary Preparation and Characterization Studies of Cellulose from Merbau (Intsia bijuga)
Advanced Materials Research, 2012Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Saadah Abdul RahmanAbstract:Hardwood is wood from angiosperm trees. The characteristic of hardwood include flowers, endosperm within seeds and the production of fruits that contain the seeds. This paper aims to discuss the preparation and characterization of cellulose obtained from hardwood. The hardwood Merbau (Intsia bijuga) was chosen as raw material in this study. Alkaline treatment and delignification methods were used for the preparation of cellulose. Acid hydrolysis was employed to produce cellulose nanocrystal (CNC). The treated and untreated samples were characterized using x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The final product, from both trated and untreated samples were then compared.
Nur Amira Mamat Razali - One of the best experts on this subject based on the ideXlab platform.
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cellulose micro nanofibres of merbau Intsia bijuga waste effects of chemical treatments on structural and morphology features
Asian Journal of Chemistry, 2018Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was isolated at atmospheric pressure. In the first stage, the samples were delignified using peroxyacetic acid to remove the amorphous structure. In the second stage, the samples were double-bleached using hydrogen peroxide and sodium hydroxide. The morphology of the cellulose samples was compared. From the X-ray diffraction (XRD) data, it is evident that both acid and alkali bleached celluloses have rich cellulose I structure.
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Cellulose Micro/Nanofibres of Merbau (Intsia bijuga) Waste: Effects of Chemical Treatments on Structural and Morphology Features
Asian Journal of Chemistry, 2017Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was isolated at atmospheric pressure. In the first stage, the samples were delignified using peroxyacetic acid to remove the amorphous structure. In the second stage, the samples were double-bleached using hydrogen peroxide and sodium hydroxide. The morphology of the cellulose samples was compared. From the X-ray diffraction (XRD) data, it is evident that both acid and alkali bleached celluloses have rich cellulose I structure.
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Effect of Chemical Treatment on Crystalline Cellulose: Changes in Crystallinity and Functional Groups of Cellulose
Advanced Materials Research, 2015Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Noriean Azraaie, Nurul Aimi Mohd Zainul Abidin, Nur Ain Ibrahim, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was extracted at atmospheric pressure. In the initial stage the sample was delignified using peroxyacetic acid to remove the amorphous. In the second stage the samples were double bleached using hydrogen peroxide (H2O2) and sodium Hydroxide (NaOH). From the X-Ray Diffraction (XRD) data it is evident that both acid and alkali bleached celluloses have rich cellulose I structure. The results are supported by FTIR study in which all samples shown typical spectra of cellulose.
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Preparation and XRD Analysis of Cellulose from Merbau (Intsia bijuga)
Advanced Materials Research, 2014Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Noriean Azraaie, Nurul Aimi Mohd Zainul Abidin, Nur Ain Ibrahim, Saadah Abdul RahmanAbstract:Hardwood is from angiosperm trees. The characteristic of woods include flower, endosperm within seeds and the production of fruits that contain the seeds. This paper aim is to discuss the preparation and characterization the cellulose obtained from hardwood and the analysis of the cellulose from x-ray diffraction result. The hardwood Merbau (Intsia bijuga) was chosen as raw material in this study. Ethanol toluene, lignin and holocellulose extraction methods were used for the preparation of cellulose while acid hydrolysis was used to produce the cellulose nanocrystal (CNC). The untreated (pure hardwood Merbau) and cellulose samples were characterized using XRD. The final products from all samples were then compared.
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Preliminary Preparation and Characterization Studies of Cellulose from Merbau (Intsia bijuga)
Advanced Materials Research, 2012Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Saadah Abdul RahmanAbstract:Hardwood is wood from angiosperm trees. The characteristic of hardwood include flowers, endosperm within seeds and the production of fruits that contain the seeds. This paper aims to discuss the preparation and characterization of cellulose obtained from hardwood. The hardwood Merbau (Intsia bijuga) was chosen as raw material in this study. Alkaline treatment and delignification methods were used for the preparation of cellulose. Acid hydrolysis was employed to produce cellulose nanocrystal (CNC). The treated and untreated samples were characterized using x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The final product, from both trated and untreated samples were then compared.
Duryat - One of the best experts on this subject based on the ideXlab platform.
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Upaya Perbaikan Pertumbuhan Bibit Merbau Darat (Intsia Palembanica) dengan Naungan dan Pemupukan
Jurnal Sylva Lestari, 2016Co-Authors: Esra Maradong Simangunsong, Melya Riniarti, DuryatAbstract:Mirabow (Intsia palembanica) is one of high quality tropical wood. The wood of mirabow is categorized in durable class I, II and strong class I, II. Mirabow has the straight wood fiber, can be used as plywood, panels, furniture, musical instrument and beautiful shiny wood surface. Among the factors that affect plant growth were shading intensity and nutrients. The purpose of the research were to figure out the effect of shading intensity and fertilization to the growth of mirabow. The Block Randomized Design (BRD) of 4 groups and 3 treatment was employed as research design. Group of the reseach was the provision of no shading (0%), shading intensity 55%, shading intensity 65%, and shading intensity 75%, meanwhile the dose of NPK fertilizer of 0 g/polybag, 2 g/polybag, and 4 g/polybag were employed as the treatments. The large of experimental unit were used 1 seedling. The variable that was observed were high accretion, diameter accretion, root length, number of leaves, crown root ratio, dry weight of crown, dry weight of root, total dry weight and quality index of seedling. Bartlett test was employed to figure out the homogenity of datas. Then, analysis of variance was used to the least significant difference. The entire data tested on 5% significant level. The results showed that 55% shading intensity, obviously increase the dry weight of crown, however the shading intensity more than 65% in fact, evidently decrease the dry weight crown and total dry weight of mirabow seedling. The dose of 4 g/polybag of NPK fertilizer, evidently the number of leaves, crown root ratio, dry weight of crown and total dry weight of mirabow seedling. Keywords : mirabow, seed fertilisation, shading intensity
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PENGARUH UKURAN BERAT BENIH TERHADAP PERKECAMBAHAN BENIH MERBAU DARAT (Intsia palembanica)
Jurnal Sylva Lestari, 2015Co-Authors: Windi Wulandari, Afif Bintoro, DuryatAbstract:The demand of mirabow wood is increas ing nowdays , where as the existence species in the nature i s getting reduced . Therefore, it’s preservation efforts are urgent to be done. Seed size was correlated with it’s vigor, where heavy seeds relatively have a better vigor, compare to the light one. The research was aimed to determine the effect of seed size to percentage of germination, average days to germinate, germination value and germination power of mirabow seeds . Th e research was conducted in greenhouse of A griculture F aculty Lampung University on November 2013 to January 2014. Th e r esearch was arranged in Complete R andom D esign (CRD), with 3 treatments and 4 replications. Seed are classified based on the weight of seed is heavy weight, medium weight, and light weight . E ach unit of experiments was used 100 mirabow seed s . The observed variables were consisted of germination percentage, average day to germination, germination value, and germination power. Data analysis methods used were homogeneity of variance, variance analysis, and least significant of difference test at 5% significant level. The results showed that seed size of mirabow has a positive effect to the germination. The heavy weight of s eed (> 3.49 g rams ) gave a better response for germination percentage 80.250% and germination value 1.595 %/day compared with the medium weight (2.36--43.49 grams) and light weight (< 2.36 g rams). Keywords: germination, mirabow, seed size
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THE EFFECT OF SEED SIZE ON SEED GERMINATION OF MIRABOW (Intsia palembanica)
2015Co-Authors: Windi Wulandari, Afif Bintoro, DuryatAbstract:The demand of mirabow wood is increas ing nowdays , where as the existence species in the nature i s getting reduced . Therefore, it’s preservation efforts are urgent to be done. Seed size was correlated with it’s vigor, where heavy seeds relatively have a better vigor, compare to the light one. The research was aimed to determine the effect of seed size to percentage of germination, average days to germinate, germination value and germination power of mirabow seeds . Th e research was conducted in greenhouse of A griculture F aculty Lampung University on November 2013 to January 2014. Th e r esearch was arranged in Complete R andom D esign (CRD), with 3 treatments and 4 replications. Seed are classified based on the weight of seed is heavy weight, medium weight, and light weight . E ach unit of experiments was used 100 mirabow seed s . The observed variables were consisted of germination percentage, average day to germination, germination value, and germination power. Data analysis methods used were homogeneity of variance, variance analysis, and least significant of difference test at 5% significant level. The results showed that seed size of mirabow has a positive effect to the germination. The heavy weight of s eed (> 3.49 g rams ) gave a better response for germination percentage 80.250% and germination value 1.595 %/day compared with the medium weight (2.36--43.49 grams) and light weight (< 2.36 g rams). Keywords: germination, mirabow, seed size
Fauziah Abdul Aziz - One of the best experts on this subject based on the ideXlab platform.
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cellulose micro nanofibres of merbau Intsia bijuga waste effects of chemical treatments on structural and morphology features
Asian Journal of Chemistry, 2018Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was isolated at atmospheric pressure. In the first stage, the samples were delignified using peroxyacetic acid to remove the amorphous structure. In the second stage, the samples were double-bleached using hydrogen peroxide and sodium hydroxide. The morphology of the cellulose samples was compared. From the X-ray diffraction (XRD) data, it is evident that both acid and alkali bleached celluloses have rich cellulose I structure.
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Cellulose Micro/Nanofibres of Merbau (Intsia bijuga) Waste: Effects of Chemical Treatments on Structural and Morphology Features
Asian Journal of Chemistry, 2017Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was isolated at atmospheric pressure. In the first stage, the samples were delignified using peroxyacetic acid to remove the amorphous structure. In the second stage, the samples were double-bleached using hydrogen peroxide and sodium hydroxide. The morphology of the cellulose samples was compared. From the X-ray diffraction (XRD) data, it is evident that both acid and alkali bleached celluloses have rich cellulose I structure.
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The Treated Cellulose Micro/Nano Fibers (CMNF) from Bioresources in Malaysia
Materials Science Forum, 2016Co-Authors: Fauziah Abdul Aziz, Noriean Azraaie, Ariffin Ismail, Wan Yunus Wan Md Zin, Norazman Mohamad Nor, Risby Mohd Sohaimi, Ahmad Zaidi Sulaiman, Norhana Abdul Halim, Dian Darina Indah Daruis, Nurul Aimi Mohd Zainul AbidinAbstract:Cellulose Micro/Nano fibers (CMNF) from various plants which is Resak (Vatica spp.) waste, Merbau (Intsia bijuga) waste, banana (Musa acuminata) pseudo-stem and pineapple (Ananas comosus) leaf fibers have been isolated and characterized. Isolation of microfibril cellulose from raw fibers was achieved using alkaline treatment and bleaching. The treated and untreated samples were characterized using x-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). Characterizations of treated and untreated samples were compared. The comparison between those treated and untreated samples giving different crystallite size, crystallinity, arrangement of CMNF and surface morphology from different plants. Hence, with these information different nanocomposite from CMNF can be constructed and manipulated for various application.
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Effect of Chemical Treatment on Crystalline Cellulose: Changes in Crystallinity and Functional Groups of Cellulose
Advanced Materials Research, 2015Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Noriean Azraaie, Nurul Aimi Mohd Zainul Abidin, Nur Ain Ibrahim, Saadah Abdul RahmanAbstract:Cellulosic material derived from Merbau (Intsia bijuga) was extracted at atmospheric pressure. In the initial stage the sample was delignified using peroxyacetic acid to remove the amorphous. In the second stage the samples were double bleached using hydrogen peroxide (H2O2) and sodium Hydroxide (NaOH). From the X-Ray Diffraction (XRD) data it is evident that both acid and alkali bleached celluloses have rich cellulose I structure. The results are supported by FTIR study in which all samples shown typical spectra of cellulose.
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Preparation and XRD Analysis of Cellulose from Merbau (Intsia bijuga)
Advanced Materials Research, 2014Co-Authors: Nur Amira Mamat Razali, Fauziah Abdul Aziz, Noriean Azraaie, Nurul Aimi Mohd Zainul Abidin, Nur Ain Ibrahim, Saadah Abdul RahmanAbstract:Hardwood is from angiosperm trees. The characteristic of woods include flower, endosperm within seeds and the production of fruits that contain the seeds. This paper aim is to discuss the preparation and characterization the cellulose obtained from hardwood and the analysis of the cellulose from x-ray diffraction result. The hardwood Merbau (Intsia bijuga) was chosen as raw material in this study. Ethanol toluene, lignin and holocellulose extraction methods were used for the preparation of cellulose while acid hydrolysis was used to produce the cellulose nanocrystal (CNC). The untreated (pure hardwood Merbau) and cellulose samples were characterized using XRD. The final products from all samples were then compared.
Faucut Sarah - One of the best experts on this subject based on the ideXlab platform.
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perbandingan daya serap serbuk gergaji kayu damar laut shorea sp dan merbau Intsia sp terhadap logam pb ii
JIPI (Jurnal IPA & Pembelajaran IPA), 2018Co-Authors: Ibnu Khaldun, Aristia Aristia, Faucut SarahAbstract:Abstra k . Penelitian ini bertujuan untuk menginvestigasi kemampuan daya serap serbuk gergaji kayu damar laut (Shorea sp) dan merbau (Intsia sp) terhadap logam Pb(II) dari larutan, dan mempelajari pengaruh kondisi percobaan seperti pH larutan, waktu kontak, jumlah adsorben dan konsentrasi adsorbat. Efisiensi adsorpsi maksimum berturut-turut sebanyak 95,72% pada pH 4 dan 98,78% pada pH 5 oleh damar laut (Shorea sp) dan kayu merbau (Intsia sp). Adsorpsi timbal oleh kedua adsorben meningkat dengan bertambahnya waktu dan pH (dari 1 hingga 5) dan menurun dengan menurunnya kekuatan ion. Data kesetimbangan dikorelasikan dengan isotherm Langmuir dan Freundlich. Kapasitas adsorpsi maksimum berdasarkan isotherm Langmuir untuk serbuk kayu damar laut dan kayu merbau berturut-turut sebesar 45,45 mg/g dan 14,706 mg/g dan berdasarkan isotherm Freundlich sebesar untuk serbuk kayu damar laut dan kayu merbau berturut-turut sebesar 1,2475 mg/g dan 1,616 mg/g. Dari hasil tersebut disimpulkan bahwa model Langmuir adalah yang terbaik. Kata kunci : Adsorpsi, damar laut, merbau, isotherm, serbuk gergaji. Abstra ct . The aim of this work is to investigate the performance of damar laut (Shorea sp) and merbau (Intsia sp) sawdust for the adsorption of lead(II) from aqueous solutions, and to study the influence of the operating conditions such as solution pH, contact time, amount of adsorbent, and concentration of adsorbate. The maximum adsorpsi efficiencies were 95.72% for damar laut (Shorea sp) at pH 4 and 98.78% for kayu merbau (Intsia sp) at pH 5. The adsorption of lead by both sorbents increased with an increase in contact time and pH (from 1 to 5) and decreased with an increase in ionic strength. The equilibrium data has been correlated with both Langmuir and Freundlich isotherms. The maximum adsorption capacity of the sawdust evaluated by Langmuir adsorption model by damar laut (Shorea sp) and merbau (Intsia sp) sawdust was 45.45 mg/g and 14.706 mg/g respectively and by Freundlich adsorption model by damar laut (Shorea sp) and merbau (Intsia sp) sawdust was 1.2473 mg/g and 1.616 mg/g respectively. The results indicate that the Langmuir model fits the data better. Keywords : adsorption, Shorea sp, Intsia sp, Isotherms, Sawdust.
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uji daya serap serbuk gergaji kayu merbau Intsia sp terhadap logam timbal ii
Jurnal Ilmiah Mahasiswa Pendidikan Kimia, 2016Co-Authors: Faucut Sarah, Ibnu Khaldun, Muhammad NazarAbstract:Abstrak Penelitian ini bertujuan untuk mengetahui daya serap serbuk gergaji kayu merbau ( Intsia sp ) terhadap logam timbal(II). Sampel serbuk gergaji kayu merbau yang digunakan sebagai adsorben diambil dari sisa pembuatan perabotan rumah tangga pada panglung kayu yang berada di sekitar Kabupaten Aceh Timur. Studi adsorpsi dilakukan dengan memvariasikan pH, waktu kontak, massa adsorben, kecepatan pengadukan, dan konsentrasi awal ion logam timbal(II) yang dianalisis dengan menggunakan AAS. Hasil penelitian menunjukkan bahwa serbuk gergaji kayu merbau ( Intsia sp ) dengan ukuran 150 mesh dapat mengadsorpsi ion logam timbal(II) dengan kondisi konsentrasi 300 ppm, pH 5, waktu kontak 40 menit, massa serbuk gergaji kayu merbau ( Intsia sp ) 3 gram, dan kecepatan pengadukan 250 rpm. Kapasitas adsorpsi dengan menggunakan adsorben yang telah diaktivasi basa lebih besar karena aktivator basa dapat melarutkan senyawa-senyawa yang menghambat proses adsorpsi. Proses adsorpsi ion timbal(II) oleh serbuk gergaji kayu merbau ( Intsia sp ) memenuhi model isoterm Langmuir dan Freundlich karena nilai R 2 yang didapatkan keduanya mendekati 1. Namun, Isoterm Freundlich lebih cocok digunakan pada proses adsorpsi ion timbal(II) oleh serbuk gergaji kayu merbau ( Intsia sp ) karena nilai R 2 isoterm Freundlich lebih besar dari isoterm Langmuir. Kata kunci : Ion logam timbal(II), serbuk gergaji, merbau ( Intsia sp ), aktivasi, adsorpsi, Isoterm Langmuir dan Freundlich Abstract The purpose of research is to understand the absorption of wood’s sawdust of merbau ( Intsia sp ) to the lead(II) metal. Wood’s sawdust of meubau is taken from residue of furniture which is making in wood’s panglong around the district of east Aceh. The adsorption is conducted by varying pH, contact time, mass of absorbent, speed of stirring, and initial concentration of lead(II) ion which is analyzed by using AAS. The research showed that wood’s sawdust of merbau with the size of 150 mesh can absorb the lead(II) ion with the concentration of 300 ppm, pH of 5, contact time of 40 minutes, 3 grams of sawdust, and speed of stirring of 250 rpm. The, capacity of absorption used activated adsorbent is greater because it can dissolve the compounds which are inhibit the adsorption. The adsorption of lead(II) ion by wood’s sawdust of merbau is qualified as models of Langmuir’s isotherm and Freundlich’s isotherm because of the R 2 value of both were closed to 1. In case, isotherm of Freundlich is more suitably used to the adsorption of lead(II) ion by wood’s sawdust of merbau because of R 2 values of Freundlich’s isotherm is more greater than Langmuir’s isotherm. Keywords : Lead(II) ion, sawdust, merbau ( Intsia sp ), activation, adsorption, Isotherm of Langmuir and Freundlich
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UJI DAYA SERAP SERBUK GERGAJI KAYU MERBAU (Intsia SP) TERHADAP LOGAM TIMBAL(II)
Fakultas Keguruan dan Ilmu Pendidikan, 2016Co-Authors: Faucut SarahAbstract:ABSTRAKKata kunci : Ion logam timbal(II), serbuk gergaji, merbau (Intsia sp), aktivasi, adsorpsi, Isoterm Langmuir dan Freundlich.Penelitian ini bertujuan untuk mengetahui daya serap serbuk gergaji kayu merbau (Intsia sp) terhadap logam timbal(II). Sampel serbuk gergaji kayu merbau yang digunakan sebagai adsorben diambil dari sisa pembuatan perabotan rumah tangga pada panglung kayu yang berada di sekitar Kabupaten Aceh Timur. Studi adsorpsi dilakukan dengan memvariasikan pH, waktu kontak, massa adsorben, kecepatan pengadukan, dan konsentrasi awal ion logam timbal(II) yang dianalisis dengan menggunakan AAS. Hasil penelitian menunjukkan bahwa serbuk gergaji kayu merbau (Intsia sp) dengan ukuran 150 mesh dapat mengadsorpsi ion logam timbal(II) dengan kondisi sebagai berikut konsentrasi 300 ppm, pH 5, waktu kontak 40 menit, massa serbuk gergaji kayu merbau (Intsia sp) 3 gram, dan kecepatan pengadukan 250 rpm. Kapasitas adsorpsi dengan menggunakan adsorben yang telah diaktivasi basa lebih besar karena aktivator basa dapat melarutkan senyawa-senyawa yang menghambat proses adsorpsi. Proses adsorpsi ion timbal(II) oleh serbuk gergaji kayu merbau (Intsia sp) memenuhi model isoterm Langmuir dan Freundlich karena nilai R2 yang didapatkan keduanya mendekati 1. Namun, Isoterm Freundlich lebih cocok digunakan pada proses adsorpsi ion timbal(II) oleh serbuk gergaji kayu merbau (Intsia sp) karena nilai R2 isoterm Freundlich lebih besar dari isoterm Langmuir.Hoboken, N
