中文摘要：

伴随环境污染问题日益加剧,光能的光电转化在催化及环境领域引起广泛关注。水钠锰矿是地表常见锰矿物之一,本文借助电化学电量控制法快速高效制备了纳米水钠锰矿电极。X射线衍射（XRD）、Raman光谱测试表明物相单一为水钠锰矿;原子力显微镜（AFM）观察电极微观形貌可见表面分布有不规则多边形格子状空隙,测定沉积电量为0.5、1.0、1.5 C水钠锰矿厚度分别约为30、200、450 nm。紫外可见漫反射吸收谱显示电极可显著吸收300~600 nm波长可见光,Tauc方程计算电极间接带隙约0.8~1.3 eV,直接带隙约2.0~2.3 eV,Mott-Schottky曲线计算平带电位约1.15 V,三电极载流子浓度分别为3.26×10~（19）、4.63×10~（19）、2.70×1020 cm~（-3）。光电流密度-时间曲线及线性扫描伏安曲线表明电极有良好光电化学响应活性Evs.SCE=1.0 V（饱和甘汞电极）恒电势光照条件下,150 min后0.5、1.0、1.5 C水钠锰矿电极对5 mg/L甲基橙降解率分别为66.3%,70.0%,67.5%,拟合反应速率常数k分别为0.44 h~（-1）、0.48 h~（-1）、0.46 h~（-1）（R2〉0.996）。综上,本文研究表明纳米水钠锰矿电极能有效可见光光电催化降解甲基橙等有机污染物。

英文摘要：

With the serious problems of environmental pollution, conversion of solar energy has caused widely attention in the fields of catalytic and environmental protection. Birnessite is one of the most common mineral distributed on earth. Nano-birnessite electrodes were synthesized quickly and effectively by electrochemical method in this paper. X-ray Diffraction（XRD） and Raman spectroscopy confirm that the electrode film has single mineral phase of birnessite. Atomic Force Microscope（AFM） was used to observe the morphology information of birnessite and which distributed irregular polygon lattice spaces. The film thickness of 0.5, 1.0, and 1.5 C birnessite electrodes approximately are 30, 200, and 450 nm, respectively. Moreover, the UV-Vis Diffuse Reflectance spectra illustrate the significant absorption of visible light from 300 to 600 nm. Tauc plots were used to extrapolating an allowed indirect band gap of 0.8-- 1.3 eV and an allowed direct band gap of 2.0--2.3 eV for electrodes. The fiat band potential of three electrodes is 1.15 V and the carrier concentration are 3.26×10~（19）、4.63×10~（19）、2.70×1020 cm3 respectively evaluated by Mott-Sehottky. In addition, the photocurrent density-time curves and LSV curves indicate that the electrodes have great photoelectrochemical activity. Furthermore, photoelectrocatalytic degradation of methyl orange with 5 mg/L concentration by three electrodes were investigated. Results show that degradation rate of methyl orange by 0.5, 1.0, and 1.5 Cbirnessite electrodes reach to 66.3%, 70.0%, and 67.5% respectively after 150 minunder a constant pre-pulsed potential of 1.0 V vs. SCE （Saturated Calomel Electrode）. And fitting the first-order kinetics reaction model the constant of reaction rate k are 0.44 h1,0.48 h1, and 0.46 h-I （R2〉 0.996）. In consequence, the electrochemically deposited nano-birnessite has the ability to degrade phenol and other organic pollution.