Macroscopic SiO2 spheres with a homogeneous amine distribution were synthesized by a one-step emulsion based synthesis approach in a flow column reactor. The CO2 adsorption capacity of the nanostructured amine-functio...Macroscopic SiO2 spheres with a homogeneous amine distribution were synthesized by a one-step emulsion based synthesis approach in a flow column reactor. The CO2 adsorption capacity of the nanostructured amine-functionalized silica spheres was studied in absence and presence of H2O. The structural properties were adjusted by varying solvents and surfactants during the synthesis and, at constant amine loadings, were found to be the main factor for influencing the CO2 sorption capacities. Under water-free conditions CO2 is bound to the amino groups via the formation of carbamates, which require two neighboring amino groups to adsorb one CO2 molecule. At constant amine concentrations sorbents with lower surface area allow to establish a higher amine density on the surface, which enhances the CO2 uptake capacities under dry conditions. In presence of H2O the CO2 adsorption changes to 1：1 stoichiometry due to stabilization of carbamates by protonation of H2O and formation of further species such as bicarbonates, which should in principle double the adsorption capacities. Low concentrations of physisorbed H2O（0.3 mmol/g） did not impair the adsorption capacity of the adsorbents for CO2, while at higher water uptakes（0.6 and 1.1 mmol/g） the CO2 uptake is reduced, which could be attributed to capillary condensation of H2O or formation of bulky reaction products blocking inner pores and access to active sites.展开更多
Ti-containing mesoporous silica materials(Ti-MSs) with isolated tetrahedrally coordinated Ti species have been widely applied in bulk molecular catalysis. Herein, Ti-MSs were synthesized using anionic surfactant SDS a...Ti-containing mesoporous silica materials(Ti-MSs) with isolated tetrahedrally coordinated Ti species have been widely applied in bulk molecular catalysis. Herein, Ti-MSs were synthesized using anionic surfactant SDS as the co-template. The SDS molecular assembled structures can interact with silica species through the interface hydrogen bonds leading to the formation of mesoporous silica structure with compact Ti-O bonds, lower hydrophilicity and low template cost. The influence of adding SDS as the co-template on the oxidation of styrene with aqueous H_2O_2 as the oxidant was investigated. Ti-MSs using SDS as the co-template showed better catalytic performance as compared with mesoporous titanium silicate synthesized with CTAB serving as the sole template. Moreover, the Ti-MSs synthesized at a Ti/Si ratio of 0.005 demonstrated an optimized performance for styrene oxidation with styrene conversion improved by 14.8%, benzaldehyde selectivity improved by 13.7% and styrene oxide selectivity improved by 9.2% when the reaction time was 6 h.展开更多
Surfactants are important chemical products,serving as emulsifiers and interfacial modifiers in the household detergents,personal care products,paints and coatings,foods,cosmetics,and pharmaceuticals industries.This r...Surfactants are important chemical products,serving as emulsifiers and interfacial modifiers in the household detergents,personal care products,paints and coatings,foods,cosmetics,and pharmaceuticals industries.This review focuses upon recent advances in research and development to improve the ecological sustainability of surfactants throughout their life cycle,including derivation from renewable resources,production using green manufacturing principles,and improved biocompatibility and biodegradability during their consumer use and disposal stages.Biobased surfactants,derived from vegetable oils,polysaccharides,proteins,phospholipids,and other renewable resources,currently comprise approximately 24%of the surfactant market,and this percentage is expected to increase,especially in Asia.The use of renewables is attractive to consumers because of reduced production of CO2,a greenhouse gas associated with climate change.Enzymes can greatly increase process sustainability,through reduced use of organic solvent,water,and energy,and reduced formation of by-products and waste products.Among the enzymes being investigated for surfactant synthesis,lipases are the most robust,due to their relatively high biocatalytic activity,operational stability and their ability to form or cleave ester,amide,and thioester bonds.For enzymes to be robust catalysts of surfactants,further research and development is needed to improve catalytic productivity,stability and reduce their purchase cost.展开更多
Recycling waste frying oils for the synthesis of flotation reagents presents a promising avenue for sustainable waste management.Moreover,it offers a cost-effective solution for crafting a specialized collector design...Recycling waste frying oils for the synthesis of flotation reagents presents a promising avenue for sustainable waste management.Moreover,it offers a cost-effective solution for crafting a specialized collector designed to efficiently remove carbonates and enhance phosphate enrichment in froth flotation processes.This study focuses on the synthesis of an anionic collector using the saponification reaction of a frying oil sample,subsequently applied to the flotation of calcite and dolomite.To elucidate the adsorption mechanisms of the frying oil collector(FrOC)and sodium oleate,a reference collector,on fluorapatite,calcite,dolomite,and quartz surfaces,comprehensive experiments were conducted,including zeta potential measurements and Fourier transform infrared spectroscopy.Results revealed diverse adsorption affinities of the molecules towards these minerals.To assess the practical performance of the collector,flotation tests were conducted using a natural phosphate ore mixture,employing a BoxBehnken experimental design.Notably,under optimized conditions(pH 9,1000 g/t of FrOC,3.5 min of conditioning,and 6 min of flotation),FrOC exhibited excellent performance,with calcite and dolomite recoveries exceeding 80%,while apatite recovery in the concentrate fraction remained below 10%.This work exemplifies both circular economy practices and the distinctive approach to sustainable mineral processing.展开更多
The kinetics of the reaction of Fast Green dye(FG)with cetylpyridinum chloride was studied in alkaline medium by UV-Visible spectrophotometer.Reduction of Fast Green dye was carried out by varying the fast green dye c...The kinetics of the reaction of Fast Green dye(FG)with cetylpyridinum chloride was studied in alkaline medium by UV-Visible spectrophotometer.Reduction of Fast Green dye was carried out by varying the fast green dye concentration,cetylpyridinum chloride concentration and concentration of sodium hydroxide.In the present study the reduction of dye was carried out in order to reduce the color content.The interaction of dye was carried out with reducing analyte(cetylpyridinum chloride).The rate of the reaction was determined by varying the above parameters at different temperatures.It was observed that the reduction followed pseudo first-order kinetics with respect to dye,surfactant,OH–ion concentration according to the following reaction pathway.reaction like entropy of activation(ΔS)and free energy of activation(ΔG)showed the extremely solvated states of transient complex which was less disorderly arranged than the oxidized form of dye,whereas Ea values reflects a high amount of energy required for the reduction of dye with cetylpyridinum chloride.展开更多
目的研究降低酒精润版液中酒精浓度的方法。方法首先将赛飞扬FS12-100润版液用纯净水配制成质量分数为3%的原液,测试表面张力;然后将不同质量分数的酒精和表面活性剂6501分别添加到原液中,测试表面张力;最后将不同质量分数的酒精和表面...目的研究降低酒精润版液中酒精浓度的方法。方法首先将赛飞扬FS12-100润版液用纯净水配制成质量分数为3%的原液,测试表面张力;然后将不同质量分数的酒精和表面活性剂6501分别添加到原液中,测试表面张力;最后将不同质量分数的酒精和表面活性剂6501同时添加到原液中,测试表面张力。结果在原液中添加质量分数为0.1%的表面活性剂6501和5%的酒精,表面张力最低为23.37 m N/m,可将酒精的质量分数由12%降低到5%。结论表面活性剂6501与酒精混合配制成新型的低酒精润版液是可行的。展开更多
基金supported by the German Research Council(DFG)within the priority program(Schwerpunktprogramm),“Poröse Medien mit definierter Porenstruktur in der Verfahrenstechnik–Modellierung,Anwendngen,Synthese”(SPP 1570)under the projects LE 1187/10 and SP 648/4the framework of the DFG Excellence Initiative the Cluster of Excellence“Engineering of Advanced Materials”(DFG EXC 415)funding via the DFG research training group GRK 1896
文摘Macroscopic SiO2 spheres with a homogeneous amine distribution were synthesized by a one-step emulsion based synthesis approach in a flow column reactor. The CO2 adsorption capacity of the nanostructured amine-functionalized silica spheres was studied in absence and presence of H2O. The structural properties were adjusted by varying solvents and surfactants during the synthesis and, at constant amine loadings, were found to be the main factor for influencing the CO2 sorption capacities. Under water-free conditions CO2 is bound to the amino groups via the formation of carbamates, which require two neighboring amino groups to adsorb one CO2 molecule. At constant amine concentrations sorbents with lower surface area allow to establish a higher amine density on the surface, which enhances the CO2 uptake capacities under dry conditions. In presence of H2O the CO2 adsorption changes to 1：1 stoichiometry due to stabilization of carbamates by protonation of H2O and formation of further species such as bicarbonates, which should in principle double the adsorption capacities. Low concentrations of physisorbed H2O（0.3 mmol/g） did not impair the adsorption capacity of the adsorbents for CO2, while at higher water uptakes（0.6 and 1.1 mmol/g） the CO2 uptake is reduced, which could be attributed to capillary condensation of H2O or formation of bulky reaction products blocking inner pores and access to active sites.
基金financially supported by the Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents (No. 2014RCJJ017)
文摘Ti-containing mesoporous silica materials(Ti-MSs) with isolated tetrahedrally coordinated Ti species have been widely applied in bulk molecular catalysis. Herein, Ti-MSs were synthesized using anionic surfactant SDS as the co-template. The SDS molecular assembled structures can interact with silica species through the interface hydrogen bonds leading to the formation of mesoporous silica structure with compact Ti-O bonds, lower hydrophilicity and low template cost. The influence of adding SDS as the co-template on the oxidation of styrene with aqueous H_2O_2 as the oxidant was investigated. Ti-MSs using SDS as the co-template showed better catalytic performance as compared with mesoporous titanium silicate synthesized with CTAB serving as the sole template. Moreover, the Ti-MSs synthesized at a Ti/Si ratio of 0.005 demonstrated an optimized performance for styrene oxidation with styrene conversion improved by 14.8%, benzaldehyde selectivity improved by 13.7% and styrene oxide selectivity improved by 9.2% when the reaction time was 6 h.
文摘Surfactants are important chemical products,serving as emulsifiers and interfacial modifiers in the household detergents,personal care products,paints and coatings,foods,cosmetics,and pharmaceuticals industries.This review focuses upon recent advances in research and development to improve the ecological sustainability of surfactants throughout their life cycle,including derivation from renewable resources,production using green manufacturing principles,and improved biocompatibility and biodegradability during their consumer use and disposal stages.Biobased surfactants,derived from vegetable oils,polysaccharides,proteins,phospholipids,and other renewable resources,currently comprise approximately 24%of the surfactant market,and this percentage is expected to increase,especially in Asia.The use of renewables is attractive to consumers because of reduced production of CO2,a greenhouse gas associated with climate change.Enzymes can greatly increase process sustainability,through reduced use of organic solvent,water,and energy,and reduced formation of by-products and waste products.Among the enzymes being investigated for surfactant synthesis,lipases are the most robust,due to their relatively high biocatalytic activity,operational stability and their ability to form or cleave ester,amide,and thioester bonds.For enzymes to be robust catalysts of surfactants,further research and development is needed to improve catalytic productivity,stability and reduce their purchase cost.
基金financially supported through the research program between OCP Group and UM6P under the specific agreement AS34-flotation project
文摘Recycling waste frying oils for the synthesis of flotation reagents presents a promising avenue for sustainable waste management.Moreover,it offers a cost-effective solution for crafting a specialized collector designed to efficiently remove carbonates and enhance phosphate enrichment in froth flotation processes.This study focuses on the synthesis of an anionic collector using the saponification reaction of a frying oil sample,subsequently applied to the flotation of calcite and dolomite.To elucidate the adsorption mechanisms of the frying oil collector(FrOC)and sodium oleate,a reference collector,on fluorapatite,calcite,dolomite,and quartz surfaces,comprehensive experiments were conducted,including zeta potential measurements and Fourier transform infrared spectroscopy.Results revealed diverse adsorption affinities of the molecules towards these minerals.To assess the practical performance of the collector,flotation tests were conducted using a natural phosphate ore mixture,employing a BoxBehnken experimental design.Notably,under optimized conditions(pH 9,1000 g/t of FrOC,3.5 min of conditioning,and 6 min of flotation),FrOC exhibited excellent performance,with calcite and dolomite recoveries exceeding 80%,while apatite recovery in the concentrate fraction remained below 10%.This work exemplifies both circular economy practices and the distinctive approach to sustainable mineral processing.
文摘The kinetics of the reaction of Fast Green dye(FG)with cetylpyridinum chloride was studied in alkaline medium by UV-Visible spectrophotometer.Reduction of Fast Green dye was carried out by varying the fast green dye concentration,cetylpyridinum chloride concentration and concentration of sodium hydroxide.In the present study the reduction of dye was carried out in order to reduce the color content.The interaction of dye was carried out with reducing analyte(cetylpyridinum chloride).The rate of the reaction was determined by varying the above parameters at different temperatures.It was observed that the reduction followed pseudo first-order kinetics with respect to dye,surfactant,OH–ion concentration according to the following reaction pathway.reaction like entropy of activation(ΔS)and free energy of activation(ΔG)showed the extremely solvated states of transient complex which was less disorderly arranged than the oxidized form of dye,whereas Ea values reflects a high amount of energy required for the reduction of dye with cetylpyridinum chloride.
文摘目的研究降低酒精润版液中酒精浓度的方法。方法首先将赛飞扬FS12-100润版液用纯净水配制成质量分数为3%的原液,测试表面张力;然后将不同质量分数的酒精和表面活性剂6501分别添加到原液中,测试表面张力;最后将不同质量分数的酒精和表面活性剂6501同时添加到原液中,测试表面张力。结果在原液中添加质量分数为0.1%的表面活性剂6501和5%的酒精,表面张力最低为23.37 m N/m,可将酒精的质量分数由12%降低到5%。结论表面活性剂6501与酒精混合配制成新型的低酒精润版液是可行的。
