The Experts below are selected from a list of 234 Experts worldwide ranked by ideXlab platform
Sara Iborra - One of the best experts on this subject based on the ideXlab platform.
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biomass derived chemicals synthesis of Biodegradable Surfactant ether molecules from hydroxymethylfurfural
Chemsuschem, 2014Co-Authors: Karen S. Arias, Maria J. Climent, Avelino Corma, Sara IborraAbstract:A new class of Biodegradable anionic Surfactants with structures based on 5-alkoxymethylfuroate was prepared starting from 5-hydroxymethylfurfural (HMF), through a one-pot-two-steps process which involves the selective etherification of HMF with fatty alcohols using heterogeneous solid acid, followed by a highly selective oxidation of the formyl group with a gold catalyst. The etherification step was optimized using aluminosilicates as acid catalysts with different pore topologies (H-Beta, HY, Mordenite, ZSM-5, ITQ-2, and MCM-41), different active sites (Bronsted or Lewis) and different adsorption properties. It was shown that highly hydrophobic defect-free H-Beta zeolites with Si/Al ratios higher than 25 are excellent acid catalysts to perform the selective etherification of HMF with fatty alcohols, avoiding the competitive self-etherification of HMF. Moreover, the 5-alkoxymethylfurfural derivatives obtained can be selectively oxidized to the corresponding furoic salts in excellent yield using Au/CeO2 as catalyst and air as oxidant, at moderated temperatures. Both H-Beta zeolite and Au/CeO2 could be reused several times without loss of activity.
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Biomass‐Derived Chemicals: Synthesis of Biodegradable Surfactant Ether Molecules from Hydroxymethylfurfural
ChemSusChem, 2013Co-Authors: Karen S. Arias, Maria J. Climent, Avelino Corma, Sara IborraAbstract:A new class of Biodegradable anionic Surfactants with structures based on 5-alkoxymethylfuroate was prepared starting from 5-hydroxymethylfurfural (HMF), through a one-pot-two-steps process which involves the selective etherification of HMF with fatty alcohols using heterogeneous solid acid, followed by a highly selective oxidation of the formyl group with a gold catalyst. The etherification step was optimized using aluminosilicates as acid catalysts with different pore topologies (H-Beta, HY, Mordenite, ZSM-5, ITQ-2, and MCM-41), different active sites (Bronsted or Lewis) and different adsorption properties. It was shown that highly hydrophobic defect-free H-Beta zeolites with Si/Al ratios higher than 25 are excellent acid catalysts to perform the selective etherification of HMF with fatty alcohols, avoiding the competitive self-etherification of HMF. Moreover, the 5-alkoxymethylfurfural derivatives obtained can be selectively oxidized to the corresponding furoic salts in excellent yield using Au/CeO2 as catalyst and air as oxidant, at moderated temperatures. Both H-Beta zeolite and Au/CeO2 could be reused several times without loss of activity.
Karen S. Arias - One of the best experts on this subject based on the ideXlab platform.
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biomass derived chemicals synthesis of Biodegradable Surfactant ether molecules from hydroxymethylfurfural
Chemsuschem, 2014Co-Authors: Karen S. Arias, Maria J. Climent, Avelino Corma, Sara IborraAbstract:A new class of Biodegradable anionic Surfactants with structures based on 5-alkoxymethylfuroate was prepared starting from 5-hydroxymethylfurfural (HMF), through a one-pot-two-steps process which involves the selective etherification of HMF with fatty alcohols using heterogeneous solid acid, followed by a highly selective oxidation of the formyl group with a gold catalyst. The etherification step was optimized using aluminosilicates as acid catalysts with different pore topologies (H-Beta, HY, Mordenite, ZSM-5, ITQ-2, and MCM-41), different active sites (Bronsted or Lewis) and different adsorption properties. It was shown that highly hydrophobic defect-free H-Beta zeolites with Si/Al ratios higher than 25 are excellent acid catalysts to perform the selective etherification of HMF with fatty alcohols, avoiding the competitive self-etherification of HMF. Moreover, the 5-alkoxymethylfurfural derivatives obtained can be selectively oxidized to the corresponding furoic salts in excellent yield using Au/CeO2 as catalyst and air as oxidant, at moderated temperatures. Both H-Beta zeolite and Au/CeO2 could be reused several times without loss of activity.
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Biomass‐Derived Chemicals: Synthesis of Biodegradable Surfactant Ether Molecules from Hydroxymethylfurfural
ChemSusChem, 2013Co-Authors: Karen S. Arias, Maria J. Climent, Avelino Corma, Sara IborraAbstract:A new class of Biodegradable anionic Surfactants with structures based on 5-alkoxymethylfuroate was prepared starting from 5-hydroxymethylfurfural (HMF), through a one-pot-two-steps process which involves the selective etherification of HMF with fatty alcohols using heterogeneous solid acid, followed by a highly selective oxidation of the formyl group with a gold catalyst. The etherification step was optimized using aluminosilicates as acid catalysts with different pore topologies (H-Beta, HY, Mordenite, ZSM-5, ITQ-2, and MCM-41), different active sites (Bronsted or Lewis) and different adsorption properties. It was shown that highly hydrophobic defect-free H-Beta zeolites with Si/Al ratios higher than 25 are excellent acid catalysts to perform the selective etherification of HMF with fatty alcohols, avoiding the competitive self-etherification of HMF. Moreover, the 5-alkoxymethylfurfural derivatives obtained can be selectively oxidized to the corresponding furoic salts in excellent yield using Au/CeO2 as catalyst and air as oxidant, at moderated temperatures. Both H-Beta zeolite and Au/CeO2 could be reused several times without loss of activity.
Somnuk Jarudilokkul - One of the best experts on this subject based on the ideXlab platform.
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removal of pyrene by colloidal gas aphrons of a Biodegradable Surfactant
Separation and Purification Technology, 2009Co-Authors: Virote Boonamnuayvitaya, Panitan Jutaporn, Srisuda Saeung, Somnuk JarudilokkulAbstract:Two commercial Biodegradable and non-toxic Surfactants (BioSolve and BioNonex) were studied for efficiency of pyrene removal from soil. Pumice was used as a model of natural soil with free of organic material. Pumice and natural soil were pretreated by soaking in pyrene solution to obtain the pyrene loading at various concentrations. In preliminary study, at the same concentration, BioNonex solution could remove pyrene from pumice better than BioSolve solution. The removal of pyrene by colloidal gas aphron (CGA) of BioNonex was conducted in a packed column of pumice operated in continuous up-flow mode. It was demonstrated that BioNonex CGA could remove pyrene (78% removal) more efficiently than BioNonex solution (68% removal) and water (11% removal) particularly based on the aqueous volume. The initial rate of removal was high and retarded after 2 h. 7% BioNonex CGA provided the maximum rate of pyrene removal which decreased from 120 to 40 mg/h within 2 h.
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Removal of Pyrene in Soil by Colloidal Gas Aphrons of Prepared from Biodegradable Surfactant
2009Co-Authors: Virote Boonamnuayvitaya, Somnuk Jarudilokkul, Srisuda Sae-ung, Panitan JutapornAbstract:Two commercial Biodegradable and non-toxic Surfactants (BioSolve and BioNonex) were studiedfor efficiency of pyrene removal from soil. Pumice was used as a model of natural soil with free of organicmaterial. Natural soil taken from KMUTT campus was also used in the experiment. Pumice and natural soilwere pretreated by soaking in pyrene solution to obtain the pyrene loading at various concentrations. Inpreliminary study, BioNonex solution could remove pyrene from pumice better than BioSolve solution atthe same concentration. The removal of pyrene by colloidal gas aphron (CGA) of BioNonex was conductedin a packed column of pumice operated in continuous up-flow mode. It was demonstrated that BioNonexCGA could remove pyrene more efficiently than BioNonex solution and water particularly based on theaqueous volume. The initial rate of removal was high and retarded after 2 h. 7% BioNonex CGA providedthe maximum rate of pyrene removal which decreased from 120 mg/h to 40 mg/h within 2 h. Keywords : Biodegradable Surfactant / Colloidal gas aphron / Pyrene / Remediation / Pumice
Xueping Chen - One of the best experts on this subject based on the ideXlab platform.
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Influence of tea saponin on enhancing accessibility of pyrene and cadmium phytoremediated with Lolium multiflorum in co-contaminated soils
Environmental science and pollution research international, 2015Co-Authors: Qian Wang, Xiaoyan Liu, Xinying Zhang, Yunyun Hou, Xia Liang, Xueping ChenAbstract:Tea saponin (TS), a kind of Biodegradable Surfactant, was chosen to improve the accessible solubilization of pyrene and cadmium (Cd) in co-contaminated soils cultivated Lolium multiflorum. TS obviously improved the accessibility of pyrene and Cd for L. multiflorum to accelerate the process of accumulation and elimination of the pollutants. The chemical forms of Cd was transformed from Fe-Mn oxides and associated to carbonates fractions into exchangeable fractions by adding TS in single Cd and pyrene-Cd contaminated soils. Moreover, the chemical forms of pyrene were transformed from associated fraction into bioaccessible fraction by adding TS in pyrene and pyrene-Cd contaminated soils. In pyrene-Cd contaminated soil, the exchangeable fraction of Cd was hindered in the existence of pyrene, and bioaccessible fraction of pyrene was promoted by the cadmium. Besides, in the process of the pyrene degradation and Cd accumulation, the effect could be improved by the elongation of roots with adding TS, and the microorganism activity was stimulated by TS to accelerate the removal of pollutions. Therefore, Planting L. multiflorum combined with adding TS would be an effective method on the phytoremediation of organics and heavy metals co-contaminated soils.
Chen Yen Chen - One of the best experts on this subject based on the ideXlab platform.
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removal of cu pb and zn by foam fractionation and a soil washing process from contaminated industrial soils using soapberry derived saponin a comparative effectiveness assessment
Chemosphere, 2013Co-Authors: Jyoti Prakash Maity, Yuh Ming Huang, Ching I Wu, Chien Cheng Chen, Chun Yi Li, Jiinshuh Jean, Youngfo Chang, Chen Yen ChenAbstract:Abstract The feasibility of using the eco-friendly Biodegradable Surfactant saponin (a plant-based Surfactant) from soapberry and surfactin from Bacillus subtilis (BBK006) for the removal of heavy metals from contaminated industrial soil (6511 mg kg −1 copper, 4955 mg kg −1 lead, and 15 090 mg kg −1 zinc) by foam fractionation and a soil flushing process was evaluated under variation of fundamental factors (Surfactant concentration, pH, temperature and time). The results of latter process showed that 1–2% Pb, 16–17% Cu and 21–24% Zn was removed by surfactin after 48 h, whereas the removal of Pb, Cu and Zn was increased from 40% to 47%, 30% to 36% and 16% to 18% in presence of saponin with an increase from 24 to 72 h at room temperature by the soil washing process at pH 4. In the foam fractionation process, the metal removal efficiencies were increased with increases in the saponin concentration (0.075–0.15 g L −1 ) and time (24–72 h), whereas the efficiency was decreased with increasing pH (4–10) and temperature (>40 °C). The removal efficiencies of Pb, Cu and Zn were increased significantly from 57% to 98%, 85% to 95% and 55% to 56% with an increase in the flow rate from 0.2 to 1.0 L min −1 at 0.15 g L −1 saponin (pH 4 and 30 °C). The present investigation indicated that the foam fractionation process is more efficient for the removal of heavy metal from contaminated industrial soil in comparison to the soil washing process. The plant-based eco-friendly Biodegradable bioSurfactant saponin can be used for environmental cleanup and pollution management.