太阳能电池协同强化水钠锰矿光电催化染料降解研究

发布时间：2018-06-25 19:45

本文选题：大阳能电池 + 水钠锰矿　；参考：《岩石矿物学杂志》2017年06期

【摘要】：电催化、光催化、光电催化等电化学技术以其高效、廉价、环保等特点被认为是一种极具前途的环境污染深度净化技术,在有机废水处理等方面得以广泛应用。本文借助电化学电量控制法制备了水钠锰矿电极,通过X射线衍射(XRD)、扫描电镜(SEM)表征其物相形貌,UV-Vis漫反射吸收谱结果表明水钠锰矿对300~600 nm波长范围可见光表现出良好吸收能力,计算其直接带隙约为2.14 e V,Mott-Schottky曲线计算其平带电位约1.15 V,0.1 mol/L Na2SO4介质中载流子浓度约为3.3×1019cm-3,是良好的可见光激发n型半导体材料。同时,本文以廉价高效的太阳能电池板取代了传统电化学工作站等外加电场设备,成功实现了协同强化水钠锰矿光电催化降解作用。协同作用下甲基橙60 min降解率为90.2%,效率远高于水钠锰矿光催化(2.2%)与电极电催化(33.6%)作用,强化了水钠锰矿光电催化降解反应,节省能耗的同时显著提高了降解效率。批次循环降解实验表明第4轮降解率(86.8%)较之第1轮(90.3%)降低程度5%,表明其具有良好长时间运行稳定性。
[Abstract]:Electrochemical techniques such as electrocatalysis and photocatalysis have been widely used in the treatment of organic wastewater because of their high efficiency, low cost and environmental protection. In this paper, sodium manganite electrode was prepared by the method of electrochemical electric quantity control. The phase morphology and UV-Vis diffuse reflectance absorption spectrum of the electrode were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that sodium manganese ore had a good absorption ability to the visible light in the wavelength range of 300 ~ 600 nm. The direct band gap is calculated to be about 2.14e V ~ (2 +) Mott-Schottky curve. Its flat band potential is about 1.15 V ~ (-1) V ~ (0.1) mol / L Na _ 2SO _ 4 medium, and the carrier concentration is about 3.3 脳 10 ~ (19) cm ~ (-3), which is a good visible light excited n-type semiconductor material. At the same time, the photocatalytic degradation of sodium manganite was successfully enhanced by replacing the external electric field equipment such as the traditional electrochemical workstation with a cheap and efficient solar panel. Under synergistic action, the degradation rate of methyl orange for 60 min was 90.2, and the efficiency was much higher than that of sodium manganite (2.2%) and electrode electrocatalysis (33.6%). The photocatalytic degradation of sodium manganite was enhanced, and the energy consumption was saved and the degradation efficiency was improved significantly. The degradation rate of the fourth round (86.8%) was 5% lower than that of the first round (90.3%), which indicated that the degradation rate of the fourth round was stable for a long time.
【作者单位】：造山带与地壳演化教育部重点实验室北京大学地球与空间科学学院矿物环境功能北京市重点实验室;
【基金】：国家重点基础研究发展计划“973计划”(2014CB846001) 国家自然科学基金(41230103,41522201,41402032)~~
【分类号】：P579;X703

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