利用 MgAl 层状双氢氧化物包覆稻壳热解得到的生物炭去除废水中的重金属：机理与应用。
Removal of heavy metals from wastewaters with biochar pyrolyzed from MgAl-layered double hydroxide-coated rice husk: Mechanism and application.
机构信息
Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural Affairs, Hubei Key Laboratory of Soil Environment and Pollution Remediation, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Interdisciplinary Sciences Institute, Huazhong Agricultural University, Wuhan 430070, Hubei Province, China.
Key Laboratory of Arable Land Conservation (Middle and Lower Reaches of Yangtse River), Ministry of Agriculture and Rural Affairs, Hubei Key Laboratory of Soil Environment and Pollution Remediation, State Environmental Protection Key Laboratory of Soil Health and Green Remediation, College of Resources and Environment, Interdisciplinary Sciences Institute, Huazhong Agricultural University, Wuhan 430070, Hubei Province, China.
出版信息
Bioresour Technol. 2022 Mar;347:126425. doi: 10.1016/j.biortech.2021.126425. Epub 2021 Nov 25.
This study reports a MgAl-LDH rice husk biochar composite (MgAl-LDH@RHB) with a regular hydrotalcite structure synthesized by a simple hydrothermal method, which was then used to remove Cd(II) and Cu(II) from water. The influencing factors on the adsorption performance were determined through batch adsorption experiments, and the adsorption characteristics and cycling capacity were evaluated with eight models and adsorption-desorption experiments. The results showed that the adsorption of Cd(II) and Cu(II) by MgAl-LDH@RHB conformed to the Langmuir-Freundlich model and PSO kinetics model, indicating single-layer chemical adsorption. In addition, the experimental maximum adsorption capacities for Cd(II) and Cu(II) were 125.34 and 104.34 mg g, respectively. The adsorption of Cd(II) and Cu(II) by MgAl-LDH@RHB was dominated by surface precipitation and ion exchange. The findings reveal the mechanism for the heavy metal removal by MgAl-LDH@RHB and provide a theoretical reference for agricultural waste disposal and water pollution control.
本研究报告了一种通过简单水热法合成的具有规则水滑石结构的 MgAl-LDH 稻壳生物炭复合材料（MgAl-LDH@RHB），该复合材料可用于从水中去除 Cd(II) 和 Cu(II)。通过批量吸附实验确定了影响吸附性能的因素，并通过八个模型和吸附-解吸实验评估了吸附特性和循环容量。结果表明，MgAl-LDH@RHB 对 Cd(II) 和 Cu(II) 的吸附符合 Langmuir-Freundlich 模型和 PSO 动力学模型，表明为单层化学吸附。此外，实验得到的 MgAl-LDH@RHB 对 Cd(II) 和 Cu(II) 的最大吸附容量分别为 125.34 和 104.34 mg/g。MgAl-LDH@RHB 对 Cd(II) 和 Cu(II) 的吸附主要由表面沉淀和离子交换作用主导。这些发现揭示了 MgAl-LDH@RHB 去除重金属的机制，为农业废弃物处置和水污染控制提供了理论参考。
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