The adsorption characteristics and mechanisms of modified sepiolite as an adsorbent to recover Pd(Ⅱ) from acidic solutions were studied. The Pd(Ⅱ) adsorption properties were analyzed through isotherm, kinetic and th...The adsorption characteristics and mechanisms of modified sepiolite as an adsorbent to recover Pd(Ⅱ) from acidic solutions were studied. The Pd(Ⅱ) adsorption properties were analyzed through isotherm, kinetic and thermodynamic models. In addition, SEM-EDS, TEM and XPS were applied to investigating the Pd(Ⅱ) adsorption mechanisms onto modified sepiolite. The equilibrium data were well fitted to Langmuir isotherm model with maximum Pd(Ⅱ) adsorption capacity of 322.58 mg/g at 30 ℃. The kinetic data could be satisfactorily simulated by the pseudosecond order model, indicating that the rate-controlling step was chemical adsorption. 99% of Pd(Ⅱ) could be recovered using 1 g/L modified sepiolite when initial concentration of Pd(Ⅱ) was 100 mg/L. The results of reusability studies indicated the modified sepiolite had an acceptable stability and reusability. This study indicated that the modified sepiolite might be an efficient and cost-effective material for Pd(Ⅱ) recovery.展开更多
[ Objective] The research aimed to study the adsorption capability of Fe modifying sepiolite on Cr（Vl）. [ Method] FeCl3 solution with different concentrations was used to modify sepiolite. By static adsorption exper...[ Objective] The research aimed to study the adsorption capability of Fe modifying sepiolite on Cr（Vl）. [ Method] FeCl3 solution with different concentrations was used to modify sepiolite. By static adsorption experiment, the adsorption capability of Fe modifying sepiolite on Cr（VI ） was studied. [Result] Under the condition of initial Cr（VI） concentration of 90 mg/L, 10.0% IMS dosage of 5 g/L, pH of 4.5, adsorption time of 90 min, and temperature of 25 ℃ the equilibrium adsorption quantity of Fe modifying sepiolite was 6.5 mg/g. [Conclusion] The research provided an effective pathway for the application of Fe modifying sepiolite in Cr（VI）-containing wastewater treatment.展开更多
基金Projects(51871250,51504106)supported by the National Natural Science Foundation of ChinaProject(SKL-SPM-201809)supported by the State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals,China+2 种基金Projects(502211852,502211906)supported by the Fundamental Research Funds for the Central Universities of Central South University,ChinaProject(SKYAM005-2016)supported by State Key Laboratory of Applied Microbiology Southern ChinaProjects(2015FB204,2016BA006,2017FA030)supported by the Yunnan Science and Technology Plan Project of China。
文摘The adsorption characteristics and mechanisms of modified sepiolite as an adsorbent to recover Pd(Ⅱ) from acidic solutions were studied. The Pd(Ⅱ) adsorption properties were analyzed through isotherm, kinetic and thermodynamic models. In addition, SEM-EDS, TEM and XPS were applied to investigating the Pd(Ⅱ) adsorption mechanisms onto modified sepiolite. The equilibrium data were well fitted to Langmuir isotherm model with maximum Pd(Ⅱ) adsorption capacity of 322.58 mg/g at 30 ℃. The kinetic data could be satisfactorily simulated by the pseudosecond order model, indicating that the rate-controlling step was chemical adsorption. 99% of Pd(Ⅱ) could be recovered using 1 g/L modified sepiolite when initial concentration of Pd(Ⅱ) was 100 mg/L. The results of reusability studies indicated the modified sepiolite had an acceptable stability and reusability. This study indicated that the modified sepiolite might be an efficient and cost-effective material for Pd(Ⅱ) recovery.
文摘[ Objective] The research aimed to study the adsorption capability of Fe modifying sepiolite on Cr（Vl）. [ Method] FeCl3 solution with different concentrations was used to modify sepiolite. By static adsorption experiment, the adsorption capability of Fe modifying sepiolite on Cr（VI ） was studied. [Result] Under the condition of initial Cr（VI） concentration of 90 mg/L, 10.0% IMS dosage of 5 g/L, pH of 4.5, adsorption time of 90 min, and temperature of 25 ℃ the equilibrium adsorption quantity of Fe modifying sepiolite was 6.5 mg/g. [Conclusion] The research provided an effective pathway for the application of Fe modifying sepiolite in Cr（VI）-containing wastewater treatment.
