Synthesis of Biomass-based Adsorbent from Rice Husk Ash for Copper Ions Adsorption

Abstract

To simultaneously solve the problems of low utilization of agricultural waste rice husk and heavy metal pollution, this investigation synthesized a high-performance copper ion adsorbent using rice husk ash(RA) as raw material. Its maximum Cu2+ adsorption capacity is 19.78 mg/g. XPS, FTIR, and BET were used to characterize the composition and structure of the material of silica depleted rice husk ash(SDRA). The thermodynamics and kinetics of copper ions' adsorption by SDRA were studied for their relevance to the adsorption mechanism. The adsorption of copper ions by SDRA is in accordance with the Langmuir model and the pseudo-second-order kinetic model. The adsorption process is mainly chemisorption. And increases in specific surface area and oxygen-containing functional groups following silica removal were primarily responsible for SDRA's enhanced adsorption ability. SDRA is a highly effective adsorbent. And the preparation technique of SDRA is a revolutionary method of adsorbent creation that is both economical and environmentally benign.

Keywords

• biomass
• ash
• circular economy
• agricultural wastes
• wastewater treatment