School of Materials Science and Chemical Engineering, Xi'an Technological University, Xi'an, Shaanxi, 710021, China E-mail:
School of Materials Science and Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi, 710021, China.
Water Sci Technol. 2020 Feb;81(4):781-789. doi: 10.2166/wst.2020.161.
MgFe-layered double hydroxides (LDHs) were prepared by co-precipitation method with the ratios of [Mg]/[Fe] varied in the range of 2:1-6:1, and occupied as heterogeneous catalysts for the degradation of Methylene Blue (MB) in the Fenton process. MgFe-LDH prepared with the ratio of [Mg]/[Fe] at 3:1 was verified to be of high purity. The Fenton-like process catalyzed by MgFe-LDH performed excellently, and more than 97% degradation of MB was obtained with 0.5 mmol/L HO and 0.50 g/L MgFe-LDH at initial pH 2 at room temperature. The occurrence of hydroxyl radicals (·OH) was detected and the mechanism was proposed. MgFe-LDH is of excellent catalytic activity and good reusability.
镁铁层状双氢氧化物（LDHs）采用共沉淀法制备，[Mg]/[Fe]比值范围为 2:1-6:1，并作为非均相催化剂用于 Fenton 过程中亚甲基蓝（MB）的降解。用[Mg]/[Fe]比值为 3:1 制备的 MgFe-LDH 被证明具有高纯度。由 MgFe-LDH 催化的类 Fenton 过程表现出色，在室温初始 pH 为 2 时，仅需 0.5mmol/L HO 和 0.50g/L MgFe-LDH 即可实现超过 97%的 MB 降解。检测到了羟基自由基（·OH）的存在，并提出了相应的反应机制。MgFe-LDH 具有优异的催化活性和良好的可重复使用性。
