As-Sb alloy was electrodeposited from high arsenic-containing solutions. The influences of current density, Sb（3＋） concentration, reaction temperature and HCl concentration on the electrolyte composition, cell volt...As-Sb alloy was electrodeposited from high arsenic-containing solutions. The influences of current density, Sb（3＋） concentration, reaction temperature and HCl concentration on the electrolyte composition, cell voltage and current efficiency were investigated. The surface morphology, composition and structure of the deposits were analyzed by scanning electron microscopy（SEM）, inductively coupled plasma mass spectrometry（ICP-MS） and X-ray diffraction（XRD）, respectively. The results show that the prepared As-Sb alloy shows an amorphous structure under all conditions. Under the optimized condition, i.e., 10 g/L As（3＋）, 2 g/L Sb（3＋）, 4 mol/L HCl, current density of 4 mA/cm2 and temperature of 20 °C, desired As-Sb alloy with a composition of 70.26% As and 29.74% Sb（mass fraction） is obtained. What is more, the current efficiency is as high as 94.74% and high arsenic removal rate is achieved under this condition.展开更多
Selective oxidation of glycerol with molecular oxygen in base-free aqueous solutions has become a hot topic,as the rapidly increasing production of biodiesel is creating a surplus of glycerol.In this work,an N-doped-c...Selective oxidation of glycerol with molecular oxygen in base-free aqueous solutions has become a hot topic,as the rapidly increasing production of biodiesel is creating a surplus of glycerol.In this work,an N-doped-carbon-supported core-shell structured Sb@PtSb2 hybrid catalyst was prepared via a facile synthesis route,in which a mixture of glucose,melamine,and SbCl3(Sb-NC)was pyrolyzed,then impregnated with Pt by immersion in an aqueous solution of H2PtCl6,and further treated in hydrogen flow.Characterization of the catalyst products indicated that introducing SbCl3 can increase the surface area of the binary glucose+melamine pyrolyzed support(NC),and Sb@PtSb2 hybrids could be formed on the surface of an Sb-NC support during hydrogen treatment at 700℃.It was found that the Sb@PtSb2/NC catalyst was more active for the selective oxidation of glycerol in a base-free aqueous solution than Sb-free NC-supported Pt(Pt/NC).Further characterization also indicated that the promising performance of Sb@PtSb2/NC might be attributed to its enhanced oxygen activation.展开更多
基金Project(51374185) supported by the National Natural Science Foundation of China
文摘As-Sb alloy was electrodeposited from high arsenic-containing solutions. The influences of current density, Sb（3＋） concentration, reaction temperature and HCl concentration on the electrolyte composition, cell voltage and current efficiency were investigated. The surface morphology, composition and structure of the deposits were analyzed by scanning electron microscopy（SEM）, inductively coupled plasma mass spectrometry（ICP-MS） and X-ray diffraction（XRD）, respectively. The results show that the prepared As-Sb alloy shows an amorphous structure under all conditions. Under the optimized condition, i.e., 10 g/L As（3＋）, 2 g/L Sb（3＋）, 4 mol/L HCl, current density of 4 mA/cm2 and temperature of 20 °C, desired As-Sb alloy with a composition of 70.26% As and 29.74% Sb（mass fraction） is obtained. What is more, the current efficiency is as high as 94.74% and high arsenic removal rate is achieved under this condition.
基金financially supported by the National Natural Science Foundation of China(21773206 and 21473155)Natural Science Foundation of Zhejiang Province(L12B03001)~~
文摘Selective oxidation of glycerol with molecular oxygen in base-free aqueous solutions has become a hot topic,as the rapidly increasing production of biodiesel is creating a surplus of glycerol.In this work,an N-doped-carbon-supported core-shell structured Sb@PtSb2 hybrid catalyst was prepared via a facile synthesis route,in which a mixture of glucose,melamine,and SbCl3(Sb-NC)was pyrolyzed,then impregnated with Pt by immersion in an aqueous solution of H2PtCl6,and further treated in hydrogen flow.Characterization of the catalyst products indicated that introducing SbCl3 can increase the surface area of the binary glucose+melamine pyrolyzed support(NC),and Sb@PtSb2 hybrids could be formed on the surface of an Sb-NC support during hydrogen treatment at 700℃.It was found that the Sb@PtSb2/NC catalyst was more active for the selective oxidation of glycerol in a base-free aqueous solution than Sb-free NC-supported Pt(Pt/NC).Further characterization also indicated that the promising performance of Sb@PtSb2/NC might be attributed to its enhanced oxygen activation.
