An Innovative Approach for the Synthesis of Grafted Copolyacrylic Xynosulfonate Sodium / Montmorillonite Gel for Effective Absorption of Heavy Metals from Aqueous Media

The presence of heavy metals in aqueous media threatens environmental safety and human health, so it is necessary to effectively remove them from wastewater. Through a simple preparation method, lignin ( LS) and montmorillonite ( MMT) were successfully prepared into efficient biosorbents. The prepared hydrogel not only has water absorption and pH-responsive swelling properties, but also has good removal effect on heavy metals. The maximum adsorption capacity of Cd ( II) ions was 587.14 mg / g. The maximum adsorption capacity of Zn (II) ions was 297.13 mg / g.The results of principal component analysis show that the adsorption process of heavy metals is in good agreement with different kinetic and isotherm models. The adsorption mechanism is proposed, which is related to the chemical properties between adsorbents. This study provides a promising and sustainable lignin-based composite hydrogel.