Development of a cost-effective attapulgite adsorbent for lead(II) removal from aqueous solution: preparation, characterization and performance

Lead contamination in water poses serious risks to ecosystems and human health, highlighting the need for low-cost and efficient treatment technologies. In this study, natural attapulgite clay was thermally treated at various temperatures to improve its capacity for removing lead ions from aqueous solutions. The adsorbent prepared at 400°C exhibited the best performance, with a maximum adsorption capacity of 32.63 mg g –1 . Characterization results indicated that while heating caused partial changes in the crystal structure, the nanorod morphology and key structural features of attapulgite were largely preserved. The enhanced adsorption ability was attributed to an increase in surface reactivity and greater accessibility of active functional groups. These findings demonstrate a simple and effective modification route that broadens the potential use of attapulgite for heavy-metal wastewater treatment.