Enhancement of phosphate adsorption by chemically modified biochars derived from Mimosa pigra invasive plant. (December 2021)

• Record Type: Journal Article
• Authors: Phuong Tran, Thi Cuc; Nguyen, Thi Phuong; Nguyen Nguyen, Thi Thao; Thao Tran, Thi Nhu; Hang Nguyen, Thi An; Tran, Quoc Ba; Nguyen, Xuan Cuong
• Is Part Of: Case studies in chemical and environmental engineering. Volume 4 (2021)
• Publication Date: 2021-12
• Subjects: Adsorption -- Engineered biochar -- Invasive plant -- Phosphate treatment -- Salt modification; Chemical engineering -- Periodicals; Environmental engineering -- Periodicals; Environmental chemistry -- Periodicals; 628.05
• DOI: 10.1016/j.cscee.2021.100117
• Languages: English
• ISSNs: 2666-0164

Abstract

Abstract: Negatively charged biochar restricts adsorbing orthophosphate anions - a main cause of eutrophication, thus modified biochar is suggested to enhance phosphate (PO4 3- ) adsorption from aqueous solution. This work tested the hypothesis that modified biochar results in the enhancement of PO4 3- adsorption compared to pristine biochar derived from Mimosa pigra . Aluminium-modified biochars with different concentrations of AlCl3 (i.e., 0.5, 1, 2, and 3 M) and the pristine biochar were performed for absorbing PO4 3- in batch experiments. Among the modified biochars, 2 M Al-modified biochar achieved the highest PO4 3- adsorption capacity (70.6 mgPO4 3- /g) which was 14 times greater than pristine biochar (5.1 mgPO4 3- /g). Chemical adsorption and electrostatic attraction may control significantly to the adsorption of PO4 3- on biochars. The 2 M Al-modified biochar presents the potential adsorbent for removing phosphorus from water. Graphical abstract: Image 1 Highlights: Al-modified biochars increased surface area, functional groups and reduced pHpzc . 2 M modified biochar obtained 70.6 mg/g in PO4 3- adsorption while biochar 5.1 mg/g. Chemical and electrostatic mechanism may control to adsorption of PO4 3- on biochar.