The MXenes,a new class of two-dimensional layered materials,have found extensive applications in water treatment for its excellent thermal stability,electrical conductivity,and excellent adsorption ability.Sulfidized ...The MXenes,a new class of two-dimensional layered materials,have found extensive applications in water treatment for its excellent thermal stability,electrical conductivity,and excellent adsorption ability.Sulfidized nano zero-valent iron(S-nZVI)is a good reducing agent,however,the practical application of S-nZVI is currently restricted due to the tendency of nano materials to agglomerate.Herein,MXenes use as a support and in situ loading S-nZVI on it to prepare a new material(S-nZVI/Ti_(3)C_(2)T_(x)),and applied it to U(VI)removal in water treatment.The microscopic characterization proves that S-nZVI on Ti_(3)C_(2)T_(x) has good dispersion and effectively alleviates agglomeration.Batch experiments shown that SnZVI/Ti_(3)C_(2)T_(x) has a very good effect on U(VI)removal,and themaximumadsorption capacity reaches 674.4mg/g under the aerobic condition at pH=6.0.The pseudo-second-order kinetic model and the Langmuir isotherm model were found to be more appropriate for describing the adsorption behavior.This indicates that the removal process is a single molecular layer chemisorption.Moreover,the S-nZVI/Ti_(3)C_(2)T_(x) maintained a removal efficiency of over 85%for U(VI)even after being reused five times,demonstrating its excellent reusability.It is worth noting that the material can remove 79.8%of 50 mg/L of U(VI)in simulated seawater,indicating that S-nZVI/Ti_(3)C_(2)T_(x) possessed an excellent uranium extraction performance from seawater.Experimental results and XPS analysis showed that U(VI)was removed by adsorption,reduction and co-precipitation.Moreover,S-nZVI/Ti_(3)C_(2)T_(x) was a lowtoxicitymaterial to Hyriopsis cumingii.Therefore,S-nZVI/Ti_(3)C_(2)T_(x) was expected to be a candidate as adsorbent with great potential in removal of uranium from wastewater and seawater.展开更多
基金supported by the National Natural Science Foundation of China(No.42277063)the Postdoctoral Research Foundation of China(No.2021M702886)+1 种基金the Leading Innovative Talents cultivation Project of Changzhou City(No.CQ20230096)the Research Initiation Project of Changzhou University.
文摘The MXenes,a new class of two-dimensional layered materials,have found extensive applications in water treatment for its excellent thermal stability,electrical conductivity,and excellent adsorption ability.Sulfidized nano zero-valent iron(S-nZVI)is a good reducing agent,however,the practical application of S-nZVI is currently restricted due to the tendency of nano materials to agglomerate.Herein,MXenes use as a support and in situ loading S-nZVI on it to prepare a new material(S-nZVI/Ti_(3)C_(2)T_(x)),and applied it to U(VI)removal in water treatment.The microscopic characterization proves that S-nZVI on Ti_(3)C_(2)T_(x) has good dispersion and effectively alleviates agglomeration.Batch experiments shown that SnZVI/Ti_(3)C_(2)T_(x) has a very good effect on U(VI)removal,and themaximumadsorption capacity reaches 674.4mg/g under the aerobic condition at pH=6.0.The pseudo-second-order kinetic model and the Langmuir isotherm model were found to be more appropriate for describing the adsorption behavior.This indicates that the removal process is a single molecular layer chemisorption.Moreover,the S-nZVI/Ti_(3)C_(2)T_(x) maintained a removal efficiency of over 85%for U(VI)even after being reused five times,demonstrating its excellent reusability.It is worth noting that the material can remove 79.8%of 50 mg/L of U(VI)in simulated seawater,indicating that S-nZVI/Ti_(3)C_(2)T_(x) possessed an excellent uranium extraction performance from seawater.Experimental results and XPS analysis showed that U(VI)was removed by adsorption,reduction and co-precipitation.Moreover,S-nZVI/Ti_(3)C_(2)T_(x) was a lowtoxicitymaterial to Hyriopsis cumingii.Therefore,S-nZVI/Ti_(3)C_(2)T_(x) was expected to be a candidate as adsorbent with great potential in removal of uranium from wastewater and seawater.
