摘要
氰化物对生物体具有剧毒作用。利用纳米TiO2粉体,以紫外光为光源,进行了光催化降解去除焦化废水中氰化物的实验研究,系统考察了焦化废水的pH值、CN^-初始浓度、TiO2用量、温度、曝气量等因素对去除焦化废水中CN^-的影响。结果表明,当废水pH值为2.0～3.0,TiO2用量为0.3g/L,温度为30℃时,总CN^-去除率可达43.6%。光催化去除CN^-过程符合一级动力学反应规律。当曝空气量为0.8L/min时,总CN^-去除率提高到58.2%;当曝氧气量为1.0L/min时,总CN^-去除率提高到68.2%。并且TiO2可以多次循环使用。
Cyanide is seriously harmful to organisms. Photo-catalytic degradation and removal of cyanide in coking wastewater was examined by nano-TiO2 under Ultraviolet. Effect of pH of coking wastewater, the initial concentration of total CN^-, amount of TiO2, temperature and aeration rate on removal of CN^- in coking wastewater were investigated systematically. Experimental results show that removal rate of total CN^- is 43.6% under the condition that pH is at 2.0～3.0,TiO2 amount is 0.3g,/L, temperature is 30℃. Photo-catalytic the first grade dynamic equation. When the volume of air is 0. 8L/min, removal 58.2%. When the volume of oxygen is 1.0L/min,removal rate of total CN^- can be be recycled several times to reuse. removal of CN^- accords with rate of total CN^- can reach up to 68.2%. And TiO2 can
出处
《洁净煤技术》
CAS
2009年第1期110-114,共5页
Clean Coal Technology
