TiO_2/Al_2O_3-UV光催化降解马拉硫磷的试验研究  

STUDY ON TiO_2/Al_2O_3 PHOTOCATALYTIC DEGRADATION OF MALATHION UNDER UV LIGHT

作　　者：潘迪[1] 张林生[1] 王志良[2] 赵珊珊[2] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]江苏省环境科学研究院重点实验室,江苏南京210032

出　　处：《水处理技术》2010年第9期30-33,共4页Technology of Water Treatment

基　　金：国家科技重大专项资助(2008ZX07421-006)

摘　　要：采用活性氧化铝负载的二氧化钛作为催化剂,在紫外汞灯光照条件下对低浓度马拉硫磷进行光催化降解,发现氧化铝负载二氧化钛具有比其它催化剂更好的降解效果。研究了反应时间、初始浓度、初始pH、催化剂投加量、曝气强度、光照强度等因素对降解效率的影响,确定了最佳的反应条件组合为催化剂投加量0.3g·L-1,曝气强度2.0L·min-1,采用500 W的紫外灯,pH控制在7.5左右,反应时间8 min,此时即使原水质量浓度高达2 mg·L-1,出水中马拉硫磷质量浓度也能降到0.005 mg·L-1,远低于生活饮用水卫生标准规定的限值,具有安全无毒、催化剂用量少、降解效率高、成本低廉等特点,可较好地应对农药突发污染。The catalyst of titanium dioxide immobilized on active aluminum oxide is used in the experiment to photocatalytic degrade Malathion of low concentration in the water under UV light, It is found that the effect of active aluminum oxide with titanium dioxide is better than other catalysts. The effect of factors such as reaction time, initialized concentration, initialized pH, dosing quantity of catalyst, aeration rate and light intensity is researched. The best reaction condition is determined： dosing quantity of catalyst 0.3 g. L^-1, aeration rate 2.0 L·min^-1, 500 W UV light, pH=7.5, reaction time 8 min. If the initialized concentration is 2 mg·L^-1, the concentration effluent is 0.005 mg·L^-1, reaching the standard of drinking water, with the characteristics of nontoxic and safe, low dosing quantity of catalyst, high degradation efficiency and low costs to deal with the sudden pollution.

关 键 词：光催化 二氧化钛 活性氧化铝 马拉硫磷 突发污染 

分 类 号：TQ031.7[化学工程] X786[环境科学与工程—环境工程]