Novel iron manganese oxide modified mulberry biochar for the adsorption of phosphorus in aqueous solution

• Published in: Desalination and water treatment 2020-06, Vol.189, p.357-366
• Main Authors: Liang, Meina, Yan, Liling, Wang, Dunqiu, Cheng, Xu, Deng, Zhenliang, Xu, Shuiping, Li, Sen
• Format: Article
• Language: English
• Subjects: Adsorption; Biochar; Mulberry; Phosphorus
• ISSN: 1944-3986; 1944-3986
• DOI: 10.5004/dwt.2020.25640

The modified iron manganese oxide modified mulberry biochar (IMOM-BC) sorbent was prepared by chemical oxidation and coprecipitation. Scanning electron microscope, Fourier-transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy were employed to analyze the adsorption mechanism of IMOM-BC for phosphorus. The effects brought by different pH values, adsorbent dosages, contact time, and coexisting ions on the adsorption were investigated. The results show that IMOM-BC with pH 2.0 can adsorb phosphorus best, and with a dosage of 2.0 g/L, the removal rate of phosphorus can reach 99.85%. Here the adsorption effect for coexisting ions of phosphorus is CO32– > SO42– > NO3–. The Langmuir isotherm adsorption model can be referred to explain the adsorption process of phosphorus by IMOM-BC. At 25°C, 35°C, and 45°C, the maximum adsorption capacity for phosphorus were 23.09, 25.32, and 26.34 mg/g, respectively. The iron, manganese oxide, surface hydroxyl, and phenolic hydroxyl groups of IMOM-BC are found to be involved in the adsorption, and the adsorption of phosphorus by IMOM-BC is considered to be mainly chemical adsorption.