Construction of lignosulfonate-lysine hydrogel for adsorption of heavy metal ions

Industrial wastewater has brought great disaster to water body and soil, and seriously affected the growth of crops. It is necessary to prepare a stable, effective and sustainable treatment agent to control water pollution in order to obtain clean water. The adsorption effect of lignosulfonate-lysine hydrogel (CLS-Lys adsorbent) on heavy metal ions (Cu2+ and Co2+) in water is studied. In the synthesis experiment, response surface method is used to optimize the content of sodium lignosulfonate, lysine, initiator and crosslinking. The CLS-Lys adsorbent is characterized by Fourier transform infrared spectroscopy, field emission scanning electron microscopy, thermal analyzer and zeta potential analyzer. The performance of CLS-Lys adsorbent under different influencing factors is studied. The kinetic and isothermal models of CLS-Lys adsorbent are established. The results show that the main adsorption model of CLS-Lys adsorbent is chemical adsorption, accompanied by electrostatic adsorption. These two ions have ...