Exploring sustainable solutions: Utilizing recycled coffee grounds as a new bio‐adsorbent material for removal of Pb(II) ions from water

• DOI: 10.1002/vjch.202400127
• Publication Date: 2024-09-18T12:04:31Z
• Authors: Tuan Anh Nguyen; Doan Thi Yen Oanh; Thi Thu Phuong Ng...; Manh Ha Nguyen; Thi Huong Nguyen; Thi Thu Trang Bui; Ngoc Thanh Nguyen; Minh Viet Nguyen; Quang Tung Nguyen; Thanh Duc Hoang
• Keywords: Coffee grounds

Abstract This study investigates the potential of utilizing spent coffee grounds (SCG) treated with Ca(OH) 2 as an adsorbent for removal lead (Pb(II)) ions from aqueous solutions. The SCG was subjected to sequential treatments, including washing, drying, sieving, and immersion in solutions varying concentrations. Adsorption experiments were conducted under different conditions evaluate efficiency adsorbent, variations contact time, solution pH, dosage, temperature, initial Pb(II) ion concentration. Characterization before after treatment performed using Fourier transform infrared spectroscopy. results revealed significant changes structural properties , leading enhanced adsorption performance. demonstrated that influenced by factors such Optimal maximum identified a time 270 min, pH 6, dosage 1 g, temperature 313 K, resulting capacity q max 18.69 mg g −1 . highest desorption rate observed HNO 3 measured at 90.6%. reusability material 87.98% first use, decreased 75.41% five reuses, further reduced 39.96% ten indicating decline performance repeated use. These findings highlight effective environmentally friendly potentially toxic elements