二硫化碳改性绿豆壳对水中Zn(Ⅱ)的吸附性能OACHSSCD

In order to promote the resource utilization of Mung bean Shells(MS),carbon disulfide is used to modify them,resulting in disulfide Carboxylated Mung bean Shells(CMS),and the treatment of wastewater containing Zn(Ⅱ)is studied.The influence of different adsorption environmental conditions on the adsorption and removal of Zn(Ⅱ)by CMS is investigated,and the adsorption mechanism of CMS on Zn(Ⅱ)is explored through characterization methods such as adsorption kinetics,isotherms,thermodynamics,Scanning Electron Microscopy(SEM),Energy Dispersive X-ray Spectroscopy(EDS)and Fourier Transform Infrared spectroscopy(FTIR).The results show that when the rotational speed of the water bath constant-temperature oscillator is 150 r/min,pH value is 6.0,adsorption temperature is 25 ℃,CMS dosage is 2 g/L,and adsorption time is 2 h,the removal rates of Zn(Ⅱ)containing wastewater with initial mass concentrations of 10,50 mg/L by CMS can reach 96.12％and 99.36％,respectively,which are improved compared to before modification.After 6 adsorption desorption cycles,CMS still maintains a high adsorption capacity.The adsorption of Zn(Ⅱ)by CMS is an exothermic and entropy reducing process,involving both single-layer and multi-layer adsorption,this process involves both chemical adsorption(such as redox and coordination reactions)and physical adsorption(such as electrostatic attraction),with the dithiocarboxyl group introduced into MS playing an important role.