The Experts below are selected from a list of 23424 Experts worldwide ranked by ideXlab platform
Sagar Pal - One of the best experts on this subject based on the ideXlab platform.
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novel biodegradable polymeric Flocculant based on polyacrylamide grafted tamarind kernel polysaccharide
Bioresource Technology, 2010Co-Authors: Sandipta Ghosh, Gautam Sen, Usha Jha, Sagar PalAbstract:Novel biodegradable polymeric Flocculants were produced by conventional redox grafting, microwave-initiated and microwave-assisted grafting of acrylamide to tamarind kernel polysaccharide (TKP). The graft copolymers were characterized by viscometry, elemental analysis, molecular weight determination using SLS analysis, and NMR spectroscopy. The flocculation efficiency of the grafting products in kaolin suspension, municipal sewage wastewater and textile industry wastewater was primarily dependent on the length of the grafted polyacrylamide chain. The Flocculant obtained by microwave-assisted grafting method was superior to TKP and polyacrylamide-based commercial Flocculant (Rishfloc 226 LV) in flocculation tests.
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cationic tamarind kernel polysaccharide cat tkp a novel polymeric Flocculant for the treatment of textile industry wastewater
International Journal of Biological Macromolecules, 2009Co-Authors: Sagar Pal, Sandipta Ghosh, Gautam Sen, Usha Jha, Reema SinghAbstract:Synthesis of cationic tamarind kernel polysaccharide (Cat TKP), its detailed physicochemical characterization and application as an efficient Flocculant for the treatment of textile industry wastewater have been investigated. N-3-Chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) was used as a cationic reagent to introduce quaternary amine groups onto the backbone of tamarind kernel polysaccharide (TKP). Various grades were synthesized to obtain the optimized one. Effect of reaction parameters onto the degree of cationization has also been investigated. The synthesized polymers were characterized by various macromolecular characterization techniques, which confirm that cationization does take place. Afterwards, the applicability of TKP and various grades of Cat TKP's as Flocculants for the treatment of textile industry wastewater was investigated. The flocculation experiments showed that TKP alone contributes little to the flocculation. However, cationic TKP led to significant improvement as Flocculant for the treatment of textile industry wastewater. The best performing Cat TKP (i.e. Cat TKP 3) was thereafter compared with a commercial Flocculant, which is cationic in nature. It has been observed that Cat TKP 3 surpasses the flocculation efficiency over commercial Flocculant.
Hu Yang - One of the best experts on this subject based on the ideXlab platform.
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evaluation of structural effects on the flocculation performance of a co graft starch based Flocculant
Water Research, 2017Co-Authors: Zhouzhou Liu, Hua Wei, Hu YangAbstract:The molecular structure of a material substantially determines its final application performance. In this work, a series of starch-based Flocculants with different charge densities and average graft chain lengths were prepared by the co-graft polymerization of acrylamide and [(2-methacryloyloxyethyl) trimethyl ammonium chloride] (St-g-PAM-co-PDMC). The flocculation performance of St-g-PAM-co-PDMC was studied systematically at neutral pH using kaolin suspension and sodium humate (NaHA) aqueous solution as synthetic wastewaters. The effects of the two structural factors on the flocculation efficiency of the starch-based Flocculants have been investigated. The experimental results showed that the charge density and average graft chain length contributed distinctly to flocculation performance during the removal of both kaolin particles and NaHA under insufficient and excessive Flocculant dose conditions. The flocculation mechanisms of this starch-based Flocculant were discussed in detail on the basis of the structure-activity relationship, which are significant to optimize the flocculation conditions and guide the development of novel high-performance Flocculants.
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synthesis of amphoteric starch based grafting Flocculants for flocculation of both positively and negatively charged colloidal contaminants from water
Chemical Engineering Journal, 2014Co-Authors: Hu Wu, Aimin Li, Hu Yang, Mu Huang, Bo Yuan, Zhen Yang, Rongshi ChengAbstract:Contaminants in real water are normally complicated. Surface charges of suspended colloidal particles can be either negative or positive. In this work, a series of amphoteric starch-based grafting Flocculants (3-chloro-2-hydroxypropyl trimethyl ammonium chloride modified starch-graft-poly(acrylamide-co-acrylic acid)) denoted as SCPAMPAA were successfully synthesized with different grafting ratios and used for the removal of different charged contaminants from water. Various SCPAMPAA Flocculants exhibited remarkably different flocculation performance and obeyed diverse flocculation mechanisms due to the differences in their structural characteristics. Therefore, precise control of the molecular structure of Flocculants is of great significance to obtain the desired flocculation performance. To provide practically operational feasibility for the preparation of a predicted Flocculant, a quantitative mathematical correlation between the preparation recipe and the structural features of SCPAMPAA were derived. The final well-designed Flocculant demonstrated a high flocculation performance in aspects of optimal dosage, flocculation window and pH sensitivity for the removal of both negatively and positively charged colloidal contaminants from targeted wastewater.
Sandipta Ghosh - One of the best experts on this subject based on the ideXlab platform.
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novel biodegradable polymeric Flocculant based on polyacrylamide grafted tamarind kernel polysaccharide
Bioresource Technology, 2010Co-Authors: Sandipta Ghosh, Gautam Sen, Usha Jha, Sagar PalAbstract:Novel biodegradable polymeric Flocculants were produced by conventional redox grafting, microwave-initiated and microwave-assisted grafting of acrylamide to tamarind kernel polysaccharide (TKP). The graft copolymers were characterized by viscometry, elemental analysis, molecular weight determination using SLS analysis, and NMR spectroscopy. The flocculation efficiency of the grafting products in kaolin suspension, municipal sewage wastewater and textile industry wastewater was primarily dependent on the length of the grafted polyacrylamide chain. The Flocculant obtained by microwave-assisted grafting method was superior to TKP and polyacrylamide-based commercial Flocculant (Rishfloc 226 LV) in flocculation tests.
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cationic tamarind kernel polysaccharide cat tkp a novel polymeric Flocculant for the treatment of textile industry wastewater
International Journal of Biological Macromolecules, 2009Co-Authors: Sagar Pal, Sandipta Ghosh, Gautam Sen, Usha Jha, Reema SinghAbstract:Synthesis of cationic tamarind kernel polysaccharide (Cat TKP), its detailed physicochemical characterization and application as an efficient Flocculant for the treatment of textile industry wastewater have been investigated. N-3-Chloro-2-hydroxypropyl trimethyl ammonium chloride (CHPTAC) was used as a cationic reagent to introduce quaternary amine groups onto the backbone of tamarind kernel polysaccharide (TKP). Various grades were synthesized to obtain the optimized one. Effect of reaction parameters onto the degree of cationization has also been investigated. The synthesized polymers were characterized by various macromolecular characterization techniques, which confirm that cationization does take place. Afterwards, the applicability of TKP and various grades of Cat TKP's as Flocculants for the treatment of textile industry wastewater was investigated. The flocculation experiments showed that TKP alone contributes little to the flocculation. However, cationic TKP led to significant improvement as Flocculant for the treatment of textile industry wastewater. The best performing Cat TKP (i.e. Cat TKP 3) was thereafter compared with a commercial Flocculant, which is cationic in nature. It has been observed that Cat TKP 3 surpasses the flocculation efficiency over commercial Flocculant.
Narayan R Mandre - One of the best experts on this subject based on the ideXlab platform.
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enhanced recovery of low grade iron ore by selective flocculation method
Journal of Dispersion Science and Technology, 2018Co-Authors: Kichakeswari Tudu, Shravan Kumar, Narayan R MandreAbstract:ABSTRACTBeneficiation of low-grade iron ore was carried out by selective flocculation process using different Flocculants, namely starch amylopectin (AP) and grafted copolymer of amylopectin (GAP). The iron ore used in the investigation contained 56.98% Fe, 5.45% Al2O3, and 4.22% SiO2. Flocculant dosage, number of floc washing, and pH were considered as variable parameters to analyze their effect on the performance of grade and recovery of concentrate. A Flocculant dosage of 0.4 mg/g was found to be the optimum condition for the sample and variable parameters under investigation. The investigation indicated that a grade of 64.77% Fe can be obtained with 96% recovery using AP; however, GAP showed the better result for Fe grade (67%) with a recovery of 97%.
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Selective flocculation of low grade iron ore slimes using different types of polymers
2017Co-Authors: Rakesh Kumar, Narayan R MandreAbstract:A study on selective flocculation of low grade iron ore slimes employing carboxymethyl cellulose (CMC) and starch as Flocculants and sodiumhexameta phosphate (SHMP) as dispersant has been carried out. The mineralogical studies reveal that the presence of hematite and goethite as major iron bearing phase. Quartz and kaolinite are found to be gangue minerals. The experiments carried out indicate that the Fe grade is enhanced from 58.24% to 65.32% Fe using starch as Flocculant. A Fe grade of 63.44% is obtained using CMC as Flocculant. Further, the efficacy of the studies was analysed using separation index, which indicate that the higher separation index was obtained with the tests employing starch.
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characterization and beneficiation of iron ore tailings by selective flocculation
Transactions of The Indian Institute of Metals, 2016Co-Authors: Rakesh Kumar, Narayan R MandreAbstract:In the present paper, an attempt has been made to beneficiate iron ore tailings by selective flocculation using guar gum and starch as Flocculants along with sodium hexametaphosphate (SHMP) as the dispersant. The mineralogical studies carried out initially indicated the presence of hematite and goethite as major iron bearing mineral phases along with quartz and kaolinite as major gangue minerals. The selective flocculation process showed that the Fe grade could be enhanced from 58.24 to 65.32 % Fe using starch as Flocculant with a recovery of 62.08 %. However, 63.2 % Fe with a recovery of 68.04 % was obtained using guar gum as the Flocculant. The efficacy of the studies were analysed using separation efficiency which indicated higher separation efficiency with the tests employing starch as the Flocculant along with SHMP.
Zhen Yang - One of the best experts on this subject based on the ideXlab platform.
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removal of cu ii and tetracycline using an aromatic rings functionalized chitosan based Flocculant enhanced interaction between the Flocculant and the antibiotic
Chemical Engineering Journal, 2016Co-Authors: Shuying Jia, Zhen Yang, Weiben Yang, Tingting Zhang, Shaopeng Zhang, Xinzhe Yang, Yayi Dong, Yuping WangAbstract:Abstract Weak interaction between Flocculants and antibiotics is a limitation in the flocculation of combined contaminants of heavy metals and antibiotics. To solve this problem, a novel chitosan-based Flocculant (BDAT-CTS) owning functional groups of aromatic rings, which possessed potential to interact with other aromatic rings in antibiotics, was synthesized and applied to remove Cu(II) and tetracycline (TC) from water. Effects of pH, Flocculant dosage and initial contaminant concentration were studied in detail. In comparison with previous reported chitosan-based Flocculant without aromatic rings structure, BDAT-CTS enjoyed significantly enhanced removal efficiency in the treatment of binary contaminants. The highest removal efficiencies of TC and Cu(II) could reach to 98.8% and 94.0%, respectively, under the corresponding optimal conditions. The improved performance was attributed to the strong triangle pairwise interactions among BDAT-CTS, Cu(II) and TC according to flocculation mechanism investigation: besides charge attraction and coordination of BDAT-CTS–Cu(II), and coordination of Cu(II)–TC, there also exists π–π stacking between the triazine rings in BDAT-CTS and the aromatic rings in TC. The current work provided valuable guidance in the design of eco-friendly polymeric Flocculants in the treatment of combined water contamination of heavy metals and antibiotics.
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synthesis of amphoteric starch based grafting Flocculants for flocculation of both positively and negatively charged colloidal contaminants from water
Chemical Engineering Journal, 2014Co-Authors: Hu Wu, Aimin Li, Hu Yang, Mu Huang, Bo Yuan, Zhen Yang, Rongshi ChengAbstract:Contaminants in real water are normally complicated. Surface charges of suspended colloidal particles can be either negative or positive. In this work, a series of amphoteric starch-based grafting Flocculants (3-chloro-2-hydroxypropyl trimethyl ammonium chloride modified starch-graft-poly(acrylamide-co-acrylic acid)) denoted as SCPAMPAA were successfully synthesized with different grafting ratios and used for the removal of different charged contaminants from water. Various SCPAMPAA Flocculants exhibited remarkably different flocculation performance and obeyed diverse flocculation mechanisms due to the differences in their structural characteristics. Therefore, precise control of the molecular structure of Flocculants is of great significance to obtain the desired flocculation performance. To provide practically operational feasibility for the preparation of a predicted Flocculant, a quantitative mathematical correlation between the preparation recipe and the structural features of SCPAMPAA were derived. The final well-designed Flocculant demonstrated a high flocculation performance in aspects of optimal dosage, flocculation window and pH sensitivity for the removal of both negatively and positively charged colloidal contaminants from targeted wastewater.