Equilibrium single and co-adsorption of nutrients from aqueous solution onto aluminium-modified biochar. (May 2022)

• Record Type: Journal Article
• Authors: Phuong Tran, Thi Cuc; Nguyen, Thi Phuong; Nguyen, Thi Tinh; Le, Phuoc Cuong; Tran, Quoc Ba; Nguyen, Xuan Cuong
• Is Part Of: Case studies in chemical and environmental engineering. Volume 5(2022)
• Publication Date: 2022-05
• Subjects: Biochar -- Co-adsorption -- Invasive plant -- Nitrate -- Phosphate; Chemical engineering -- Periodicals; Environmental engineering -- Periodicals; Environmental chemistry -- Periodicals; 628.05
• DOI: 10.1016/j.cscee.2022.100181
• Languages: English
• ISSNs: 2666-0164

Abstract

Abstract: The pristine biochars are negatively charged, hindering the adsorption of NO3 − and PO4 3− in water. The current study developed a 2 M AlCl3 - modified biochar and elucidated the co-adsorption behaviour of these ions at the equilibrium condition. The adsorption of NO3 − and PO4 3− onto the biochar modelled by Langmuir and Freundlich isotherms. The results demonstrate that the max adsorption capacity of NO3 −, and PO4 3− in the solution containing one solute ion were 31.80 mg/g and 95.05 mg/g; in the mixed solution of two solute ions were 26.67 mg/g and 78.99 mg/g, respectively. This modified biochar was evidenced as an effective adsorbent to remove simultaneously NO3 - and PO4 3- from aqueous solutions. Adsorption using this material is an appropriate method for eutrophication mitigation. Highlights: 2 M AlCl3 - modified biochar was developed to absorb both NO3 − and PO4 3- . NO3 − max adsorption gained 31.80 mg/g in single test & 26.67 mg/g in co-adsorption. PO4 3− max adsorption was 95.05 mg/g in one ion and 78.99 mg/g in mixed ions. The competition in co-adsorption reduced adsorption capacity for each ion.