文献类型：期刊文献

中文题名：pHCd(II)

英文题名：Microscopic Insights into pH-dependent Adsorption of Cd(II) on Molybdenum Disulfide Nanosheets

作者：Dong Lijia[1];Guo Xiaojie[2];Li Xue[1];Chen Chaogui[1];Jin Yang[1];Alsaedi, Ahmed[3];Hayat, Tasawar[3,4];Zhao Qingzhou[5];Sheng Guodong[6]

机构：[1]Shaoxing Univ, Sch Life Sci, Shaoxing 312000, Peoples R China;[2]Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Peoples R China;[3]King Abdulaziz Univ, Fac Sci, Dept Math, NAAM Res Grp, Jeddah 21589, Saudi Arabia;[4]Quaid I Azam Univ, Dept Math, Islamabad 44000, Pakistan;[5]Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China;[6]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Peoples R China

年份：2020

卷号：35

期号：3

起止页码：293

外文期刊名：JOURNAL OF INORGANIC MATERIALS

收录：SCI-EXPANDED(收录号：WOS:000540998700006)、、EI(收录号：20201608480391)、WOS

基金：National Natural Science Foundation of China (31700476)

语种：英文

外文关键词：MoS2 nanosheets; pH; microstructure; EXAFS; cadmium(II)

外文摘要：Herein, the retention mechanisms and microstructure of Cd(II) on MoS2 nanosheets were evaluated by batch experiments and EXAFS technology. The sorption of Cd(II) on MoS2 was strongly affected by solution pH, contact time, and temperature, but not by the ionic strength. The solution pH could only promote the sorption capacity, but does not improve the sorption rates and change the sorption isotherms and thermodynamics in the pH range of 3.3-9.6. The pseudo-second-order model could fit the equilibrium data better and the intra-particle diffusion model showed three typical stages in the sorption process. The isotherms and thermodynamics analysis indicated that the heterogeneity sorption of Cd(II) onto MoS2 was a spontaneous, endothermic, and irreversible process. The EXAFS spectra revealed the coexistence of two sorption types. The inner-sphere complexation was formed in the form of Cd-S bond at lower pH (3.56, 6.48), while the Cd(OH)(2) precipitation occurred in the form of Cd-O and Cd-Cd bonds at higher pH (9.57). These results provide new insights into the interaction mechanisms between metal ions and MoS2 nanosheets.