The solvent extraction of copper from simulated ammoniacal spent etchant with 1-（4＇-dodecyl）-phenyl-3-tertiary butyl-1,3-octadione（HR） was studied,and a model of extraction isotherm was proposed and verified with...The solvent extraction of copper from simulated ammoniacal spent etchant with 1-（4＇-dodecyl）-phenyl-3-tertiary butyl-1,3-octadione（HR） was studied,and a model of extraction isotherm was proposed and verified with equilibrium extraction constant.The influence of equilibration time,extractant concentration and phase ratio on the extraction of copper was studied at（298±0.5） K.For the spent etching solutions containing 112.98 g/L Cu,6 mol/L NH3 and 1 mol/L NH4＋,the optimal solvent extraction condition of copper was obtained in one-stage solvent extraction at phase ratio of 5：4 with 40% HR in sulphonated kerosene for 5 min.The copper concentration in the raffinate decreased to 63.24 g/L and raffinate can be favorably recycled to the etching solution.The stripping studies were carried out with the simulated copper spent electrolyte containing 30 g/L Cu and 180 g/L H2SO4.The stripping ratio is 98.27% from the loaded organic phase after one-stage stripping at phase ratio of 1：2 at（298±0.5） K.展开更多
A new magnetic mesoporous As(Ⅲ)adsorbent of Fe_(3)O_(4)@SiO_(2)@Ce-ZrO_(2)was prepared by solvothermal and sol^(-)gel method.The core-shell adsorbent presented a high specific surface area(168.2 m^(2)/g)and fast magn...A new magnetic mesoporous As(Ⅲ)adsorbent of Fe_(3)O_(4)@SiO_(2)@Ce-ZrO_(2)was prepared by solvothermal and sol^(-)gel method.The core-shell adsorbent presented a high specific surface area(168.2 m^(2)/g)and fast magnetic separation performance(5.37 A·m^(2)/kg).Compared with Fe_(3)O_(4)@SiO_(2)@ZrO_(2),the Ce-doped sample exhibited 12%-23%increase in As(Ⅲ)uptake over p H 3-11,which was mainly attributed to the formation of bimetal M—O—As complexes.The coexisted SO^_(4)(2-)and PO^_(4)(3-)weakened As(Ⅲ)adsorption,Ca^(2+)worked oppositely,but the impact of Cl^(-)and NO_(3)^(-)was negligible.The As(Ⅲ)maximum adsorption capacity was 24.52 mg/g at 313 K with an initial As(Ⅲ)concentration of 5 mg/L at pH 7,and its kinetics was well fitted by the pseudo-second-order model.Moreover,the adsorbent exhibited remarkable recyclability.It is suggested that Fe_(3)O_(4)@SiO_(2)@Ce-ZrO_(2)is a promising adsorbent for the advanced treatment of As(Ⅲ)contaminated wastewater.展开更多
基金Project (2007CB613601) supported by the National Basic Research Program of China
文摘The solvent extraction of copper from simulated ammoniacal spent etchant with 1-（4＇-dodecyl）-phenyl-3-tertiary butyl-1,3-octadione（HR） was studied,and a model of extraction isotherm was proposed and verified with equilibrium extraction constant.The influence of equilibration time,extractant concentration and phase ratio on the extraction of copper was studied at（298±0.5） K.For the spent etching solutions containing 112.98 g/L Cu,6 mol/L NH3 and 1 mol/L NH4＋,the optimal solvent extraction condition of copper was obtained in one-stage solvent extraction at phase ratio of 5：4 with 40% HR in sulphonated kerosene for 5 min.The copper concentration in the raffinate decreased to 63.24 g/L and raffinate can be favorably recycled to the etching solution.The stripping studies were carried out with the simulated copper spent electrolyte containing 30 g/L Cu and 180 g/L H2SO4.The stripping ratio is 98.27% from the loaded organic phase after one-stage stripping at phase ratio of 1：2 at（298±0.5） K.
基金the financial support from the Open Research Fund of Jiangsu Key Laboratory of Resources and Environmental Information Engineering,China(No.JS201810)。
文摘A new magnetic mesoporous As(Ⅲ)adsorbent of Fe_(3)O_(4)@SiO_(2)@Ce-ZrO_(2)was prepared by solvothermal and sol^(-)gel method.The core-shell adsorbent presented a high specific surface area(168.2 m^(2)/g)and fast magnetic separation performance(5.37 A·m^(2)/kg).Compared with Fe_(3)O_(4)@SiO_(2)@ZrO_(2),the Ce-doped sample exhibited 12%-23%increase in As(Ⅲ)uptake over p H 3-11,which was mainly attributed to the formation of bimetal M—O—As complexes.The coexisted SO^_(4)(2-)and PO^_(4)(3-)weakened As(Ⅲ)adsorption,Ca^(2+)worked oppositely,but the impact of Cl^(-)and NO_(3)^(-)was negligible.The As(Ⅲ)maximum adsorption capacity was 24.52 mg/g at 313 K with an initial As(Ⅲ)concentration of 5 mg/L at pH 7,and its kinetics was well fitted by the pseudo-second-order model.Moreover,the adsorbent exhibited remarkable recyclability.It is suggested that Fe_(3)O_(4)@SiO_(2)@Ce-ZrO_(2)is a promising adsorbent for the advanced treatment of As(Ⅲ)contaminated wastewater.
