Institute of Agricultural Resource and Regional Planning, Chinese Academy of Agricultural Sciences/Key Lab of Plant Nutrition and Nutrient Cycling, Ministry of Agriculture, Beijing, 100081, China; Hubei University, Wuhan, 430062, China.
Hubei University, Wuhan, 430062, China.
Chemosphere. 2020 Nov;259:127469. doi: 10.1016/j.chemosphere.2020.127469. Epub 2020 Jun 19.
In this study, Mg and/or Al modified biochars (MABC, MBC, ABC) prepared by co-precipitation were to explore their phosphate adsorption capacity from aqueous solution and the potential for soil phosphate interception. The results revealed that MABC composites contained more functional groups than MBC and showed a higher surface area than ABC. The surface of MABC contained dispersed MgAlO, Mg(OH), AlOOH and AlO crystals that were associated with its enhanced maximum phosphate adsorption capacity (153.40 mg g). According to Langmuir model, the maximum adsorption capacity of MABC was 15.91, 1.85, and 93.54 times the capacity of MBC, ABC, and raw biochar (BC), respectively. The addition of MABC in red soil could significantly slow down the release of soil phosphorus, and MABC also had a stronger phosphate interception capacity (59.89%) than other BCs. In summary, MABC exhibits superior phosphate adsorption and interception capacity, making it ideal for treatment and prevention of phosphorus-polluted water.
在这项研究中，通过共沉淀法制备了镁和/或铝改性生物炭（MABC、MBC、ABC），以探索其从水溶液中吸附磷酸盐的能力以及在土壤中拦截磷酸盐的潜力。结果表明，MABC 复合材料比 MBC 含有更多的官能团，比 ABC 具有更高的表面积。MABC 的表面含有分散的 MgAlO、Mg(OH)、AlOOH 和 AlO 晶体，这与其增强的最大磷酸盐吸附容量（153.40 mg g）有关。根据朗缪尔模型，MABC 的最大吸附容量分别是 MBC、ABC 和原始生物炭（BC）的 15.91、1.85 和 93.54 倍。在红壤中添加 MABC 可以显著减缓土壤磷的释放，并且 MABC 比其他 BCs 具有更强的磷酸盐拦截能力（59.89%）。总之，MABC 表现出优异的磷酸盐吸附和拦截能力，是处理和预防磷污染水的理想选择。
