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稀土Nd改性纳米TiO2-NTs/SnO2-Sb电极的制备、结构及性能 认领 引用 被引量:8
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作者 杨莉莎 刘俊峰 +3 位作者 黄琳琳 郭嘉钰 冯玉杰 LOGAN Bruce 《环境工程学报》 CAS CSCD 北大核心 2018年第8期2161-2169,共9页
采用溶剂热法制备了稀土Nd掺杂TiO_2-NTs/SnO_2-Sb电极,以苯酚作为典型有机物,考察了电极组成、结构与电极电催化效能的关系,实验结果表明,Nd的掺杂量对电极电催化性能有较大的影响,当前驱液中Nd/Sn原子摩尔百分比为3%时,电极的电催化... 采用溶剂热法制备了稀土Nd掺杂TiO_2-NTs/SnO_2-Sb电极,以苯酚作为典型有机物,考察了电极组成、结构与电极电催化效能的关系,实验结果表明,Nd的掺杂量对电极电催化性能有较大的影响,当前驱液中Nd/Sn原子摩尔百分比为3%时,电极的电催化活性最佳,对苯酚浓度及TOC的降解速率较空白电极(Nd0%)提高了60%及52%。利用SEM及XRD分析方法对所制备的电极进行了形貌及晶形结构的表征,并计算了电极表面SnO_2晶胞参数以及平均粒径,结果显示,适量地掺杂Nd元素后,电极表面更加致密,SnO_2平均粒径变小。通过XPS分析电极表面元素组成,并计算电极表面吸附氧含量,结果表明,由于Nd元素的存在,降低了涂层中晶格氧(Olat)的含量,减弱了电子的吸引作用,促使了Sn4+周围电子云密度升高,从而电极表面Sn元素特征衍射峰表现为向低结合能方向偏移。与空白电极(Nd0%)相比,改性后的电极(Nd3%)涂层表面Sb含量下降,且吸附氧(Oads)含量上升,为空白电极的1.6倍。EPR测试结果进一步证实了改性后电极性能提高的机制,Nd元素的引入,增加了电极涂层表面氧空位的浓度,使得电极涂层表面各元素的化学环境发生改变。掺杂改性后,电极的析氧电位以及产羟基自由基能力均得以提升,从而促使电极催化活性大大增强。 展开更多
关键词 TiO2-NTs/SnO2-Sb电极 Nd掺杂 氧空位 电催化氧化
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A high activity of Ti/SnO_2-Sb electrode in the electrochemicaldegradation of 2,4-dichlorophenol in aqueous solution 认领 引用 被引量:5
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作者 Junfeng Niu Dusmant Maharana +2 位作者 Jiale Xu Zhen Chai Yueping Bao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2013年第7期1424-1430,共7页
Electrochemicaldegradation of2,4-dichlorophenol (2,4-DCP) in aqueous solutionwas investigated over Ti/SnO2-Sb anode. The factors influencing thedegradation rate, such as applied currentdensity (2-40 mA/cm2 ), pH ... Electrochemicaldegradation of2,4-dichlorophenol (2,4-DCP) in aqueous solutionwas investigated over Ti/SnO2-Sb anode. The factors influencing thedegradation rate, such as applied currentdensity (2-40 mA/cm2 ), pH (3-11) and initial concentration (5-200 mg/L)were evaluated. Thedegradation of2,4-DCP followed apparent pseudo first-order kinetics. Thedegradation ratio on Ti/SnO2 -Sb anode attained 〉 99.9% after 20 min of electrolysis at initial 5-200 mg/L concentrations at a constant currentdensity of 30 mA/cm2 with a 10 mmol/L sodium sulphate (Na2SO4 ) supporting electrolyte solution. The results showed that 2,4-DCP (100 mg/L)degradation and total organic carbon (TOC) removal ratio achieved 99.9% and 92.8%, respectively, at the optimal conditions after 30 min electrolysis. Under this condition, thedegradation rate constant (k) and thedegradation half-life (t1/2 )were 0.21 min1 and (2.8 ± 0.2) min, respectively. Mainly carboxylic acids (propanoic acid, maleic acid, propanedioic acid, acetic acid and oxalic acid) weredetected as intermediates. The energy efficiencies for2,4-DCPdegradation (5-200 mg/L)with Ti/SnO2-Sb anode ranged from 0.672 to 1.602 g/kWh. The Ti/SnO2-Sb anodewith a high activity to rapid organic oxidation could be employed todegrade chlorophenols, particularly2,4-DCP inwastewater. 展开更多
关键词 2 4-dichlorphenol Ti/SnO2 -Sb electrode electrochemicaldegradation total organic carbon
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Electrochemical Oxidation of Chlorimuron-ethyl on Ti/SnO_2-Sb_2O_5/PbO_2 Anode for Waste Water Treatment 认领 引用
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作者 YU Shi-jun XUE Bin +2 位作者 WANG Jian-ya SUN Jian SHEN Zhi-qiu 《Chemical Research in Chinese Universities》 SCIE CAS 2010年第4期630-635,共6页
The electrochemical oxidation of chlorimuron-ethyl on metry. The electrochemical behaviour of the electrode in a sodium Ti/SnO2-Sb2O5/PbO2 electrode was studied by cyclic voltamsulfate solution and in the mixture solu... The electrochemical oxidation of chlorimuron-ethyl on metry. The electrochemical behaviour of the electrode in a sodium Ti/SnO2-Sb2O5/PbO2 electrode was studied by cyclic voltamsulfate solution and in the mixture solution of sodium sulfate and chlorimuron-ethyl was studied. The experimental results of cyclic voltammetry show that the acidic medium was suitable for the efficient electrochemical oxidation of chlorimuron-ethyl. Some electro-generated reagent was formed in the electrolysis process and chlorimuron-ethyl could be oxidized by the electro-generated reagent. A Ti/SnO2-Sb2O5/PbO2 electrode was used as the anode and the electrolysis experiment was carried out under the optimized conditions. The electrolysis process was monitored by UV-Vis spectrometry and high performance liquid chromatography(HPLC), and the chemical oxygen demand(COD) was determined by the potassium dichromate method. The mechanism of chlorimuron-ethyl to be oxided was studied primarily by the cyclic voltammetry and UV-Vis spectrometry. The results of electrolysis experiment demonstrate the possibility of the electrode to be used as an anode for the electrochemical treatment of chlorimuron-ethyl contained in waste water. 展开更多
关键词 Ti/SnO2-Sb2O5/PbO2 electrode Chlorimuron-ethyl Cyclic voltammetry Electrochemical oxidation Waste water treatment
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纳米SnO_2/TiO_2半导体薄膜电极的制备及其光电响应性能 认领 引用 被引量:2
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作者 赵玮婷 徐瑞芬 付国柱 《北京化工大学学报(自然科学版)》 EI CAS 2004年第6期52-55,共4页
采用化学沉积和电镀的方法在ITO导电玻璃表面制备SnO2 /TiO2 纳米半导体薄膜电极 ,用SEM ,XRD进行了物性表征 ,并用光电流 时间曲线、循环伏安法研究了薄膜电极光电流响应随时间、电压的变化情况。研究结果表明 ,SnO2 的掺杂有助于TiO2... 采用化学沉积和电镀的方法在ITO导电玻璃表面制备SnO2 /TiO2 纳米半导体薄膜电极 ,用SEM ,XRD进行了物性表征 ,并用光电流 时间曲线、循环伏安法研究了薄膜电极光电流响应随时间、电压的变化情况。研究结果表明 ,SnO2 的掺杂有助于TiO2 薄膜表面产生的气孔孔径增大 ,数量变多。此法可制备具有多孔、粒径小于 10 0nm的纳米SnO2 /TiO2 半导体薄膜电极。与纯纳米TiO2 薄膜电极相比 ,在光照条件下SnO2 的掺杂使得复合薄膜电极在阳极峰电位下的阳极峰电流的响应程度明显大于纯纳米TiO2 薄膜电极响应程度 ,有利于提高光生载流子的运输和分离效率 ,并从机理上阐述了光电流响应的提高归因于不同能级半导体之间的耦合效应。 展开更多
关键词 SnO2/TiO2 薄膜电极 耦合效应
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电催化氧化处理三唑类杀菌剂模拟废水 认领 引用 被引量:7
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作者 衷从强 梁林玥 +2 位作者 韩卫清 尹魁浩 彭盛华 《环境工程学报》 CAS CSCD 北大核心 2016年第2期755-760,共6页
以三环唑和丙环唑为特征污染物,研究了Ti O2-NTs/Sn O2-Sb/Pb O2电极电催化氧化处理模拟废水中三唑类杀菌剂的机理。实验结果表明,电催化氧化对废水中三唑类杀菌剂的降解符合一级动力学关系,且降解速率为:丙环唑>三环唑。利用气相色... 以三环唑和丙环唑为特征污染物,研究了Ti O2-NTs/Sn O2-Sb/Pb O2电极电催化氧化处理模拟废水中三唑类杀菌剂的机理。实验结果表明,电催化氧化对废水中三唑类杀菌剂的降解符合一级动力学关系,且降解速率为:丙环唑>三环唑。利用气相色谱-质谱联用仪(GC-MS)和离子色谱仪(IC)对电催化氧化降解三环唑和丙环唑溶液产生的中间产物和最终产生的有机酸和无机离子进行检测分析,推断出废水中三唑类杀菌剂电催化氧化的降解路径。通过斑马鱼实验得出电催化氧化对废水中三环唑急性毒性的削减幅度较大,对丙环唑的削减幅度较小。 展开更多
关键词 电催化氧化 TiO2-NTs/SnO2-Sb/PbO2电极 三唑类杀菌剂 中间产物 废水处理
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