College of Resources and Environmental Science, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China.
State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, PR China.
J Colloid Interface Sci. 2018 Jan 15;510:207-220. doi: 10.1016/j.jcis.2017.09.066. Epub 2017 Sep 18.
In this research, MnO nanosheets on montmorillonite (MnO nanosheets@MMt) was synthesized by one-pot hydrothermal method and characterized by X-ray diffraction, Fourier transform infrared spectra, nitrogen adsorption and scanning electron microscopy. It was found that honeycomb-like MnO nanosheets vertically grew on the surface of montmorillonite. MnO nanosheets@MMt exhibited high methylene blue (MB) removal rate, which reached 97.7% within 5min under the condition of pH 2, MnO nanosheets dosage of 0.1gL and initial dye concentration of 10mgL. Additionally, the influencing factors such as pH value, amount of MnO nanosheets@MMt, and MB concentration were also investigated in this paper. Results showed the MB degradation process was correlated with pH value, and the MnO nanosheets@MMt achieved MB removal rate of 92.8% within 5min under pH 11 because of its absorption capacity of MB. The kinetics of the adsorption process complied with the Pseudo-second-order model. The Langmuir model was found to be the most suitable for describing the experimental equilibrium data of MnO nanosheets@MMt. The MnO nanosheets@MMt showed high adsorption capacity of 363.63mgg for MB dye. The oxidative decomposition of MB was conducted in the presence of MnO nanosheets@MMt in the low pH, finding that the lower the pH was, the faster the degradation rate was. This research demonstrates that MnO nanosheets@MMt has potential applications in wastewater treatment.
在这项研究中，通过一步水热法合成了蒙脱土负载的 MnO 纳米片（MnO 纳米片@MMt），并通过 X 射线衍射、傅里叶变换红外光谱、氮气吸附和扫描电子显微镜对其进行了表征。结果发现，蜂窝状的 MnO 纳米片垂直生长在蒙脱土的表面。MnO 纳米片@MMt 对亚甲基蓝（MB）具有很高的去除率，在 pH 值为 2、MnO 纳米片用量为 0.1g/L、初始染料浓度为 10mg/L 的条件下，5min 内去除率达到 97.7%。此外，本文还研究了 pH 值、MnO 纳米片@MMt 用量、MB 浓度等影响因素。结果表明，MB 的降解过程与 pH 值有关，在 pH 值为 11 时，MnO 纳米片@MMt 对 MB 的去除率达到 92.8%，这是因为其对 MB 的吸附能力。吸附过程的动力学符合拟二级动力学模型。Langmuir 模型被发现最适合描述 MnO 纳米片@MMt 的实验平衡数据。MnO 纳米片@MMt 对 MB 染料的吸附容量高达 363.63mgg。在低 pH 值下，MnO 纳米片@MMt 存在时可以进行 MB 的氧化分解，发现 pH 值越低，降解速度越快。这项研究表明，MnO 纳米片@MMt 在废水处理中有潜在的应用价值。
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