氧化镍/硅藻土制备条件及其析氧研究

摘要采用混合法制备氧化镍催化剂选择性催化次氯酸钠分解生成原子氧，原子氧具有非常强的活性，能增强次氯酸钠的氧化性。同时考察了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，而对于 pH值来说，弱酸或中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，单独使用含有一定总氧化性物质浓度的次氯酸钠溶液对罗丹明B溶液的COD去除率极小，未超过10%；而氧化镍与次氯酸钠协同使用对罗丹明B溶液的COD去除率最高达到84.68%。这说明，使用氧化镍作为催化剂，催化含有一定总氧化性物质浓度的次氯酸钠溶液对有机染料罗丹明B溶液的COD有很高的去除效率。分析研究了次氯酸钠的分解特性列举了次氯酸钠的不稳定现象，影响次氯酸钠稳定性的诸因素。48249

通过对次氯酸钠稳定性的测定,进而提出了提高次氯酸钠稳定性的措施，严格控制生产工艺条件，除去金属杂质，控制溶液的pH值,添加稳定剂及合理贮藏等。

Abstract Using mixed method preparation of nickel oxide catalysts for selective catalytic sodium hypochlorite decompose and generate oxygen atoms, the oxygen atom with strong activity, can enhance the oxidation of sodium hypochlorite. We also investigated the effect of temperature and pH value on nickel based catalyst decomposition reaction rate of ROS production of sodium hypochlorite. The experimental results show that, for the pH value, weak acid or neutral environment is more conducive to improve the reaction rate and oxygen production; the higher the temperature, the faster the decomposition reaction rate. In the preliminary experiment of organic wastewater treatment, used alone contains a total oxidation substances concentration of sodium hypochlorite solution of Rhodamine B in aqueous solutions on the COD removal rate is minimal, no more than 10%; and nickel oxide and sodium hypochlorite synergistic use of Rhodamine B solution of COD removal rate reached the highest 84.68%. This shows that the nickel oxide as catalyst, catalyst containing a total oxidation substances concentration of sodium hypochlorite solution of organic dye rhodamine B solution of cod has a high removal efficiency. Analysis of the sodium hypochlorite decomposition characteristics cited the instability of the sodium hypochlorite, influence the stability of sodium hypochlorite factors.

Based on the stability of sodium hypochlorite determination and puts forward the measures to improve the stability of sodium hypochlorite, strict control production process conditions, removing the metal impurities, controlling pH value of the solution, adding stabilizer and reasonable storage.

毕业论文关键词：催化氧化; 次氯酸钠; 氧化镍;

Key words: Catalytic oxidation; sodium hypochlorite; nickel oxide；

1引言 6

2实验内容和实验方法 8

2.1实验装置 8

2.2镍基催化剂的制备以及负载 8

2.3镍基催化剂产氧性能评估 8

2.4次氯酸钠的分解特性 9

2.5提高次氯酸钠的稳定性的途径 10

2.5.1控制次氯酸钠的pH 11

2.5.2除去金属杂质 11

2.5.3添加稳定剂 11

2.5.4将次氯酸钠溶液进行稀释 12

3实验结果 12

3.1镍基催化剂催化氧化效果氧化镍/硅藻土制备条件及其析氧研究:http://www.youerw.com/huaxue/lunwen_50788.html