Two kinds of novel chelating adsorbents have been synthesized to separate boron from aqueous solutions. One is the boron-specific chelating resin,synthesized by the functionalization of macroporous poly (glycidyl meth...Two kinds of novel chelating adsorbents have been synthesized to separate boron from aqueous solutions. One is the boron-specific chelating resin,synthesized by the functionalization of macroporous poly (glycidyl methacrylate-co-trimethylolpropane trimethacrylate),with N-methylglucamine. The other is the organic-inorganic hybrid mesoporous SBA-15 with polyol functional groups,prepared by a two-step post-grafting method. The resin can adsorb boron in almost all pH range,and its maximum uptake capacity reaches 1.15 mmol/g. The present study of the polyol-functionalized SBA-15 shows that the post-grafting is successful and the resulting adsorbent has the uptake capacity of 0.63 mmol/g.展开更多
An iron-containing SBA-15（Fe-SBA-15） has been synthesized via one-pot hydrothermal method under weak acidic conditions. A series of characterizations show nanocomposite materials of iron particles supported over mes...An iron-containing SBA-15（Fe-SBA-15） has been synthesized via one-pot hydrothermal method under weak acidic conditions. A series of characterizations show nanocomposite materials of iron particles supported over mesostructured materials. The catalytic activity of these iron-containing SBA-15 materials has been tested for the heterogeneous Fenton degradation of phenolic aqueous solutions. The catalytic performance has beta monitored in terms of phenol conversion, whereas the catalytic stability was evaluated by catalyst recycle. The influence of concentration of hydrogen peroxide, catalyst loading, catalyst prepared with different Fe/Si molar ratios in the gel and pH values of the solution on phenol conversion has been studied. Achieving a good catalytic performance accompanied with a noteworthy stability, Fe-SBA-15 materials prepared by this method are shown as the successful catalyst for degradation of phenolic aqueous solutions by Fenton process.展开更多
Iron-containing SBA-15 catalysts have been prepared following different synthesis routes, direct synthesis by adjusting pH at 3 and 6 and with post synthesis procedure. Activity and stability of these materials were a...Iron-containing SBA-15 catalysts have been prepared following different synthesis routes, direct synthesis by adjusting pH at 3 and 6 and with post synthesis procedure. Activity and stability of these materials were assessed on the photo-Fenton degradation of phenolic aqueous solutions by H2O2 using near ultraviolet irradiation （254 nm） at room temperature and initial neutral pH. Their catalytic performance was mentioned in terms of phenol and TOC （total organic carbon） conversions. Several complementary techniques, including X-ray, nitrogen sorption isotherms, UV （Ultraviolet） visible, were used to evaluate the final structural and textural properties of calcined Fe-SBA 15 materials. These materials show a high activity and stability of iron species.展开更多
In this study,a series of polyetherimide/SBA-15： 2-D hexagonal P6 mm,Santa Barbara USA（PEI/SBA-15） adsorbents modified by phosphoric ester based surfactants（including tri（2-ethylhexyl）phosphate（TEP）,bis（2-eth...In this study,a series of polyetherimide/SBA-15： 2-D hexagonal P6 mm,Santa Barbara USA（PEI/SBA-15） adsorbents modified by phosphoric ester based surfactants（including tri（2-ethylhexyl）phosphate（TEP）,bis（2-ethylhexyl） phosphate（BEP） and trimethyl phosphonoacetate（TMPA））were prepared for CO2 adsorption.Experimental results indicated that the addition of TEP and BEP had positive effects on CO2 adsorption capacity over PEI/SBA-15.In particular,the CO2 adsorption amount could be improved by around 20% for 45PEI-5TEP/SBA-15 compared to the additive-free adsorbent.This could be attributed to the decrease of CO2 diffusion resistance in the PEI bulk network due to the interactions between TEP and loaded PEI molecules,which was further confirmed by adsorption kinetics results.In addition,it was also found that the cyclic performance of the TEP-modified adsorbent was better than the surfactant-free one.This could be due to two main reasons,based on the results of in situ DRIFT and TG-DSC tests.First and more importantly,adsorbed CO2 species could be desorbed more rapidly over TEP-modified adsorbent during the thermal desorption process.Furthermore,the enhanced thermal stability after TEP addition ensured lower degradation of amine groups during adsorption/desorption cycles.展开更多
Precise control of the pore sizes for porous carbon materials is of importance to study the confinement effect of metal particles because the pore size in nanosize range will decide the physical and chemical propertie...Precise control of the pore sizes for porous carbon materials is of importance to study the confinement effect of metal particles because the pore size in nanosize range will decide the physical and chemical properties of the metal nanoparticles. In this paper, we report a new approach for the synthesis of iron doped ordered mesoporous carbon materials with adjustable pore size using Fe-SBA-15 as hard template and boric acid as the pore expanding reagent. The pore size can be precisely adjusted by a step of 0.4 nm in the range of 3-6 nm. The carbonization temperature can be lowered to 773 K due to the catalytic role of the doped iron. The present approach is suitable for facile synthesis of metal imbedded porous carbon materials with tunable pore sizes.展开更多
基金Supported by the National Natural Science Foundation (No. 20276075) The Hundred Talents of the Chinese Academy of Sciences The CAS-Bayer Start-up Fund
文摘Two kinds of novel chelating adsorbents have been synthesized to separate boron from aqueous solutions. One is the boron-specific chelating resin,synthesized by the functionalization of macroporous poly (glycidyl methacrylate-co-trimethylolpropane trimethacrylate),with N-methylglucamine. The other is the organic-inorganic hybrid mesoporous SBA-15 with polyol functional groups,prepared by a two-step post-grafting method. The resin can adsorb boron in almost all pH range,and its maximum uptake capacity reaches 1.15 mmol/g. The present study of the polyol-functionalized SBA-15 shows that the post-grafting is successful and the resulting adsorbent has the uptake capacity of 0.63 mmol/g.
基金the National Natural Science Foundation of China(2040101550574082)
文摘An iron-containing SBA-15（Fe-SBA-15） has been synthesized via one-pot hydrothermal method under weak acidic conditions. A series of characterizations show nanocomposite materials of iron particles supported over mesostructured materials. The catalytic activity of these iron-containing SBA-15 materials has been tested for the heterogeneous Fenton degradation of phenolic aqueous solutions. The catalytic performance has beta monitored in terms of phenol conversion, whereas the catalytic stability was evaluated by catalyst recycle. The influence of concentration of hydrogen peroxide, catalyst loading, catalyst prepared with different Fe/Si molar ratios in the gel and pH values of the solution on phenol conversion has been studied. Achieving a good catalytic performance accompanied with a noteworthy stability, Fe-SBA-15 materials prepared by this method are shown as the successful catalyst for degradation of phenolic aqueous solutions by Fenton process.
文摘Iron-containing SBA-15 catalysts have been prepared following different synthesis routes, direct synthesis by adjusting pH at 3 and 6 and with post synthesis procedure. Activity and stability of these materials were assessed on the photo-Fenton degradation of phenolic aqueous solutions by H2O2 using near ultraviolet irradiation （254 nm） at room temperature and initial neutral pH. Their catalytic performance was mentioned in terms of phenol and TOC （total organic carbon） conversions. Several complementary techniques, including X-ray, nitrogen sorption isotherms, UV （Ultraviolet） visible, were used to evaluate the final structural and textural properties of calcined Fe-SBA 15 materials. These materials show a high activity and stability of iron species.
基金financially supported by the "151" Talent Project of Zhejiang Province (2013)the Key Project of Zhejiang Provincial Science and Technology Program (No.2012C03003-4)the Program for Zhejiang Leading Team of S&T Innovation (No.2013TD07)
文摘In this study,a series of polyetherimide/SBA-15： 2-D hexagonal P6 mm,Santa Barbara USA（PEI/SBA-15） adsorbents modified by phosphoric ester based surfactants（including tri（2-ethylhexyl）phosphate（TEP）,bis（2-ethylhexyl） phosphate（BEP） and trimethyl phosphonoacetate（TMPA））were prepared for CO2 adsorption.Experimental results indicated that the addition of TEP and BEP had positive effects on CO2 adsorption capacity over PEI/SBA-15.In particular,the CO2 adsorption amount could be improved by around 20% for 45PEI-5TEP/SBA-15 compared to the additive-free adsorbent.This could be attributed to the decrease of CO2 diffusion resistance in the PEI bulk network due to the interactions between TEP and loaded PEI molecules,which was further confirmed by adsorption kinetics results.In addition,it was also found that the cyclic performance of the TEP-modified adsorbent was better than the surfactant-free one.This could be due to two main reasons,based on the results of in situ DRIFT and TG-DSC tests.First and more importantly,adsorbed CO2 species could be desorbed more rapidly over TEP-modified adsorbent during the thermal desorption process.Furthermore,the enhanced thermal stability after TEP addition ensured lower degradation of amine groups during adsorption/desorption cycles.
基金The Programme Strategic Scientific Alliances between China and the Netherlands(2008DFB50130)National Basic Research Program of China (2009CB623503,2005CB221407)
基金supported by the Natural Science Foundation of China (NSFC Grant No. 20803064)the Natural Science Foundation of Zhejiang Province(Y4090348)the Qianjiang Talent Project in Zhejiang Province (2010R10039)
文摘Precise control of the pore sizes for porous carbon materials is of importance to study the confinement effect of metal particles because the pore size in nanosize range will decide the physical and chemical properties of the metal nanoparticles. In this paper, we report a new approach for the synthesis of iron doped ordered mesoporous carbon materials with adjustable pore size using Fe-SBA-15 as hard template and boric acid as the pore expanding reagent. The pore size can be precisely adjusted by a step of 0.4 nm in the range of 3-6 nm. The carbonization temperature can be lowered to 773 K due to the catalytic role of the doped iron. The present approach is suitable for facile synthesis of metal imbedded porous carbon materials with tunable pore sizes.
