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以SnCl4·5H2O、ZnNO3·6H2O、HCl、NaOH为原料,采用共沉淀法制备出纳米ZnO/SnO2纳米复合催化剂粉体,以降解甲基橙溶液反应为模型,考察了不同比例ZnO/SnO2纳米粉体的光催化活性,探讨了煅烧温度对催化剂催化活性的影响.并用差热失重分析仪(TG/DSC)、透射电镜(TEM)、X-射线衍射(XRD)测试手段对其进行了表征.结果表明:ZnO复合SnO2后,光催化活性明显提高,其中以ZnO/SnO2在ZnO∶SnO2=4∶1的情况下复合催化剂光催化性能最优;热处理温度在650℃保温时间2h所得到的复合催化剂催化性能最好. 相似文献
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以ZnSO4·7H2O、WO3和C2H2O4为起始原料,采用直接沉淀法制备了复合光催化剂WO3/ZnO。以甲基橙为研究对象,800W氙灯为光源,研究了催化剂煅烧温度、催化剂用量、WO3含量以及甲基橙初始浓度对其催化性能的影响。结果表明,WO3含量为15%,460℃煅烧3h所得的WO3/ZnO效果较好,在浓度为10mg/L的甲基橙溶液中加入WO3/ZnO1g/L,光照90min后脱色率可高达97.98%,且重复使用6次后脱色率仍在82%以上,表明WO3/ZnO复合光催化剂具有较好的催化性能和稳定性。 相似文献
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本文用水作为分散介质,采用球磨法掺杂一定量的Bi12TiO20于ZnO中制备复合光催化剂Bi12TiO20/ZnO.利用UV-Vis、XRD和SEM等仪器对样品进行了分析与表征.通过对甲基橙的氧化来研究其光催化活性.结果表明,光催化剂Bi12TiO20/ZnO对甲基橙氧化的催化活性高于氧化锌的催化活性.当Bi12TiO20的掺杂量为0.5%(质量分数),球磨时间为12 h,焙烧温度为300℃时,光照20 min后,复合光催化剂Bi12TiO20/ZnO对甲基橙的降解率可达到95.2%. 相似文献
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本文以SnCl4·5H2O、ZnCl2、氨水为原料,采用共沉淀法制备出SnO2/ZnO复合光催化剂,用XRD测试手段对其进行了表征,并以降解亚甲基蓝为模型反应,用分光光度计测定亚甲基蓝降解前后的吸光度,考察了不同条件下制备的复合氧化物的光催化活性,讨论了影响亚甲基蓝降解率主要因素。结果表明,ZnO复合SnO2后,光催化活性明显优于纯ZnO,且经400℃焙烧1.5h制得的复合光催化剂具有较高的光催化活性,利用该复合光催化材料降解有机染料废水是一种可行的方法。 相似文献
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研究ZnO/SnO2复合催化剂的合成,考察ZnO/SnO2前驱体在不同Zn/Sn反应剂量的摩尔比、不同沉淀剂Na2CO3与总金属离子溶液的体积,以及不同反应时间条件下制备的复合催化剂对甲基橙光催化降解效果的影响。研究表明,当Zn/Sn反应剂量的摩尔比为9∶1,沉淀剂Na2CO3与总金属离子溶液的体积比为2∶1,反应时间为10min时制取的复合催化剂前驱体对甲基橙的光催化降解效果最好,降解30min甲基橙溶液的脱色率可达96.00%以上。 相似文献
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JAMES T. NICHOLS FRANK R. McLARNON ELTON J. CAIRNS 《Chemical Engineering Communications》2013,200(1-6):355-379
Electrolytes having 3.5 M hydroxide-ion concentration were tested in 1.35 Ah Zn/NiOOH cells to evaluate their ability to reduce the extent of zinc species migration and slow the rate of cell capacity decline. Alkaline-fluoride and alkaline-borate electrolytes, in which ZnO solubility is approximately 25° of that in standard 7.4 M KOH electrolyte, exhibited 0.09-0.14°/cycle zinc-electrode area loss, which may be compared to a value of 0.46°/cycle observed in standard electrolyte, In addition, no zinc penetration of the separator occurred in cells that employed alkaline-fluoride and alkaline-borate electrolytes, even when zinc-electrode overpotcntials reached 290 mV at the end of charge. Less than 2° of the zinc remaining after cycling was electrochemically inactive. 相似文献
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JAMES T. NICHOLS FRANK R. McLARNON ELTON J. CAIRNS 《Chemical Engineering Communications》2013,200(3-6):357-381
Electrolytes having 3.5 M hydroxide-ion concentration were tested in 1.35 Ah Zn/NiOOH cells to evaluate their ability to reduce the extent of zinc species migration and slow the rate of cell capacity decline. Alkaline-fluoride and alkaline-borate electrolytes, in which ZnO solubility is approximately 25% of that in standard 7.4 M KOH electrolyte, exhibited 0.09-0.14%/cycle zinc-electrode area loss, which may be compared to a value of 0.46%/cycle observed in standard electrolyte. In addition, no zinc penetration of the separator occurred in cells that employed alkaline-fluoride and alkaline-borate electrolytes, even when zinc-electrode overpotentials reached 290 mV at the end of charge. Less than 2% of the zinc remaining after cycling was electrochemically inactive. 相似文献
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James T. Nichols FRANK R. McLARNON Elton J. Cairns 《Chemical Engineering Communications》1985,38(3):357-381
Electrolytes having 3.5 M hydroxide-ion concentration were tested in 1.35 Ah Zn/NiOOH cells to evaluate their ability to reduce the extent of zinc species migration and slow the rate of cell capacity decline. Alkaline-fluoride and alkaline-borate electrolytes, in which ZnO solubility is approximately 25% of that in standard 7.4 M KOH electrolyte, exhibited 0.09-0.14%/cycle zinc-electrode area loss, which may be compared to a value of 0.46%/cycle observed in standard electrolyte. In addition, no zinc penetration of the separator occurred in cells that employed alkaline-fluoride and alkaline-borate electrolytes, even when zinc-electrode overpotentials reached 290 mV at the end of charge. Less than 2% of the zinc remaining after cycling was electrochemically inactive. 相似文献
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通过控制参加反应的氧化锌的量,制不溶性性的黄腐酸锌,用傅里叶红外光谱和x射线衍证实了所得到的结果,水溶性黄腐酸锌作为饲料添加剂对仔猪的生长具有明显的促进作用。 相似文献
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运用DTA、TG、热台显微镜和EGA,并辅以UV分析,研究了葡萄糖酸锌的耐热性,得到了保持其不变质的最高短时耐受温度及常温至566℃的温区内所发生的基本变化过程。还在DTA曲线配合下,用两种热重灵敏度测得的TG实验结果,经统计计算后得到了葡萄糖酸锌的最高结晶水数。文中还指出了不同干燥条件对结晶水量有着明显的影响,使结晶水数可在0~3范围内变动。 相似文献
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为了研究ZnO压敏电阻组成中非化学配比氧化物对ZnO压敏电阻导电性能的影响,采用在不同氧分压条件下烧结样品以研究其烧结行为。结果表明:ZnO晶粒的电导率对数与氧分压对数成线性关系;斜率为-1/4;间隙Zn原子以一价电离Zni形式存在。由于CoO,MnO和NiO阳离子空位氧化物多偏析于晶界,晶界处氧的增加有利于降低压敏电阻漏电流,烧结时间从2h延长到8h,漏电流从5μA/cm^2降到3.6μA/cm^2。波谱分析表明:掺杂氧化物在晶界处都有偏析,ZnO晶粒中掺杂原子混溶比例不完全与掺杂阳离子半径相关。 相似文献