【摘要】：伴隨環(huán)境污染問題日益加劇,光能的光電轉(zhuǎn)化在催化及環(huán)境領域引起廣泛關注。水鈉錳礦是地表常見錳礦物之一,本文借助電化學電量控制法快速高效制備了納米水鈉錳礦電極。X射線衍射(XRD)、Raman光譜測試表明物相單一為水鈉錳礦;原子力顯微鏡(AFM)觀察電極微觀形貌可見表面分布有不規(guī)則多邊形格子狀空隙,測定沉積電量為0.5、1.0、1.5 C水鈉錳礦厚度分別約為30、200、450 nm。紫外可見漫反射吸收譜顯示電極可顯著吸收300~600 nm波長可見光,Tauc方程計算電極間接帶隙約0.8~1.3 eV,直接帶隙約2.0~2.3 eV,Mott-Schottky曲線計算平帶電位約1.15 V,三電極載流子濃度分別為3.26×10~(19)、4.63×10~(19)、2.70×1020 cm~(-3)。光電流密度-時間曲線及線性掃描伏安曲線表明電極有良好光電化學響應活性Evs.SCE=1.0 V(飽和甘汞電極)恒電勢光照條件下,150 min后0.5、1.0、1.5 C水鈉錳礦電極對5 mg/L甲基橙降解率分別為66.3%,70.0%,67.5%,擬合反應速率常數(shù)k分別為0.44 h~(-1)、0.48 h~(-1)、0.46 h~(-1)(R20.996)。綜上,本文研究表明納米水鈉錳礦電極能有效可見光光電催化降解甲基橙等有機污染物。
[Abstract]:With the worsening of environmental pollution, photovoltaic conversion of light energy has attracted wide attention in the field of catalysis and environment. Sodium manganite is one of the most common manganese minerals on the surface. Nanocrystalline sodium manganite electrodes have been prepared rapidly and efficiently by means of electrochemical electricity control method. X-ray diffraction (XRD), Raman) spectra show that the phase of the nanocrystalline manganite is a single sodium manganite. Atomic force microscope (AFM) (AFM) was used to observe the microcosmic morphology of electrode with irregular polygonal lattice voids. The thickness of sodium manganite was about 30200450 nm.. UV-Vis diffuse reflectance spectroscopy showed that the electrode could significantly absorb the visible light at the wavelength of 300,600 nm. The indirect band gap of the electrode was calculated by Tauc equation. The indirect band gap of the electrode was about 0.81.3 eV, and the direct band gap was 2.02.3V. the flat band potential of the electrode was estimated to be about 1.15V. The carrier concentrations of three electrodes are 3.26 脳 10 ~ (19), 4.63 脳 10 ~ (19) and 2.70 脳 1020 cm~ (-3), respectively. The photocurrent density-time curve and the linear scanning voltammetry curve show that the electrode has a good photochemical response under the constant potential illumination of Evs.SCE=1.0 V (saturated calomel electrode). After 150 min, the degradation rate of 5 mg/L methyl orange was 66.3- 70.0 and 0.44 h-1, 0.48 h ~ (-1), respectively, and the degradation rate of 5 mg/L methyl orange was 0.44 h ~ (-1) and 0.48 h ~ (-1), respectively, and the corresponding reaction rate constants were 0.44 h ~ (-1) and 0.48 h ~ (-1), respectively. 0.46 h-1 (R20.996). In summary, it is shown that nanocrystalline sodium manganite electrode can effectively photocatalyze the degradation of organic pollutants such as methyl orange by visible light.
【作者單位】： 造山帶與地殼演化教育部重點實驗室礦物環(huán)境功能北京市重點實驗室北京大學地球與空間科學學院;
【基金】：973計劃(2014CB846001) 國家自然科學基金(批準號:41230103;41272003;41402032) 博士后基金(2014M550552)
【分類號】：P579;X703

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