Adsorption of Sb(Ⅲ) in water by modified rice straw biochar
MA Zhi-qiang1, XU Si-qin1, JI Jiang-hao1, PENG Gang-yi1, SUN Jing-ru2
1. Key Laboratory of Karst Georesources and Environment, Ministry of Education, College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China; 2. Gansu Provincial Institute of Natural Resources Planning, Lanzhou 730000, China
Abstract：Modified Rice straw biochars were used as absorbents to remove Sb(Ⅲ) from water. Rice straw biochars modified by Mn and Fe-Mn were marked as Mn-BC, Fe-Mn-BC respectively. Firstly, the surface properties of the adsorbents were analyzed by BET and SEM. Secondly, under the conditions of the optimal pH and solid-liquid ratio for adsorption, experiments of isothermal adsorption, kinetic adsorption and coexisting anions in the system were carried out. Thirdly, the regeneration adsorption capacities of modified biochars were investigated. Finally, FT-IR、XPS were used to explore the adsorption mechanisms of Sb(Ⅲ) on Mn-BC and Fe-Mn-BC. The modified biochar had larger specific surface areas and total pore volumes than BC. Under the condition of the optimal pH 2 for BC, pH 4for Mn-BC and Fe-Mn-BC, the optimal solid-liquid ratio 2.5g/L, and at 25℃, the maximum theoretical adsorption capacities of BC, Mn-BC and Fe-Mn-BC were 5.08, 11.45, 29.45mg/g respectively, The adsorption of Sb(Ⅲ) by BC was highly related to physical adsorption, and the adsorption of Sb(Ⅲ) on Mn-BC and Fe-Mn-BC were related to chemical and physical adsorption. The adsorption of Sb(Ⅲ) on Mn-BC was greatly affected by F-, HCO3- and H2PO4-, and the adsorption of Sb(Ⅲ) on Fe-Mn-BC was nearly not interfered by ion type and ionic strength. Compared with Mn-BC, Fe-Mn-BC had a greater adsorption and regeneration capacity. The adsorption mechanism of Sb(Ⅲ) on Mn-BC and Fe-Mn-BC would be described as follow: firstly, most of Sb(Ⅲ) was oxidized to Sb(Ⅴ), then Sb(Ⅴ) was combined with Mn of Mn-BC or Fe/Mn of Fe-Mn-BC to produce relatively stable inner layer composites Mn-O-Sb and Fe-O-Sb-Mn, through the obvious electrostatic effect under acidic conditions. In addition, the functional groups —OH, C=O, and —NH of modified biochar also played an important role in adsorption
马志强, 胥思勤, 姬江浩, 彭刚毅, 孙靖茹. 改性水稻生物炭对水体中Sb(Ⅲ)的吸附[J]. 中国环境科学, 2021, 41(6): 2706-2716.
MA Zhi-qiang, XU Si-qin, JI Jiang-hao, PENG Gang-yi, SUN Jing-ru. Adsorption of Sb(Ⅲ) in water by modified rice straw biochar. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(6): 2706-2716.
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