Nano-cerium oxide functionalized biochar for phosphate retention: preparation, optimization and rice paddy application. (October 2017)

• Record Type: Journal Article
• Authors: Feng, Yanfang; Lu, Haiying; Liu, Yang; Xue, Lihong; Dionysiou, Dionysios D.; Yang, Linzhang; Xing, Baoshan
• Is Part Of: Chemosphere. Volume 185(2017)
• Page Start: 816
• Page End: 825
• Publication Date: 2017-10
• Subjects: Functionalized biochar -- Phosphate retention -- Nano-cerium oxide -- Response Surface Model -- Rice paddy; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2017.07.107
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this study, nano-cerium oxide functionalized maize straw biochar (Ce-MSB) was prepared and utilized to remove P from agricultural wastewater. Response Surface Model was applied to optimize the operating conditions. Moreover, Ce-MSB was applied to actual rice paddy column for the first time. Response Surface Model (RSM) showed higher materials ratio had positive effect on PO4 3− adsorption capacity, while higher pyrolysis temperature had negative effect. The maximum adsorption capacity of Ce-MSB for PO4 3− was 78 mg g −1, implying that Ce-MSB was an effective functionalized adsorbent for P removal. Paddy soil column experiment showed that application of Ce-MSB decreased total phosphorus concentration of surface water by 27.33% and increased total phosphors (TP) content of top soil by 7.22%. Further, Ce-MSB tends to increase rice plant height and leaf area. Therefore, Ce-MSB can be used as a promising functionalized biochar to reduce the risk of phosphorus loss from paddy field surface running water. Graphical abstract: Highlights: Novel nano-cerium oxide functionalized biochar (Ce-MSB) was synthesized. Ce-MSB exhibited around 30 times greater P adsorption capacity than crude biochar. Optimal operating conditions for Ce-MSB preparation were determined by RSM model. Ce-MSB was for the first time applied in actual rice paddy soil-water environment. Ce-MSB enhanced P retention capacity in rice paddy column and promoted rice growth.