Ni2O3催化剂的制备及其催化NaClO分解产生活性氧的性能

Preparation and performance of Ni_2O_3 catalyst for the active oxygen resulted from NaClO decomposition

采用混合法制备Ni2O3催化剂选择性催化次氯酸钠分解生成原子氧,该原子氧具有极强的活性,能增强次氯酸钠的氧化性。采用XRD、SEM、BET等方法对催化剂的物化性质及催化性能进行了研究,同时考察了不同负载量催化剂、次氯酸钠浓度、pH值和温度对镍基催化剂分解次氯酸钠产生活性氧的反应速率的影响。实验结果表明,次氯酸钠溶液浓度与反应速率成正比;而对于pH值来说,中性或弱酸性环境更有利于提高反应速率和产氧量;温度越高分解反应速率越快。在初步处理有机废水的实验中,甲醇、甲苯、间氨基苯磺酸COD的去除率分别达到91.3%、89.28%和84.53%。

Sodium hypochlorite is a strong oxidation agent, while it usually decomposes into hydrogen chloride under natural conditions. Ni2O3 catalyst prepared by a mixing method can make sodium hypochlorite decompose to atomic oxygen. Such atomic oxygen produced is very active, hence the oxidation ability of sodium hypochlorite could be greatly enhanced. The physicochemical properties and catalytic performance of the catalyst were investigated by X-ray diffraction （XRD）, scanning electron microscope （SEM） and BET. The decomposition rate of sodium hypochlorite yielding atomic oxygen was evaluated with the catalyst in different proportion, concentration, pH, and temperatures. The decomposition rate increases with increasing sodium hypochlorite concentration, and a neutral or weak acid environment as well as a higher temperature is favorable for the reaction. Preliminary experiment for organic waste water treatment illustrated that the COD removal efficiency for methanol, toluene and metanilic acid was 91.3%, 89.28% and 84.53%, respectively.