化工学报2011，Vol.62Issue(10)：2920-2925,6.DOI:10.3969/j.issn.0438-1157.2011.10.034
共存物质对O3/H2O2工艺降解2,4-D的影响(Ⅰ)2,4-D降解动力学
Effect of coexisting substances on degradation of 2,4-D in O3/H2O2 process(Ⅰ) 2,4-D degradation kinetics
摘要
Abstract
In order to study the effect of complicated surroundings of water quality on 2,4-D degradation in O3/H2O2 process, different inorganic salts and organics were added in aqueous solution which was prepared by deionized water, and tap water and surface water were also used to prepare 2, 4-D solution. The results show that different coexisting substances have different influences on 2, 4-D degradation. Pseudo-first-order rate constants of 2,4-D degradation can be increased by sodium phosphate, sodium carbonate, sodium silicate, sodium bicarbonate, formic acid, sodium nitrate, tap water and surface water. On the contrary, they decreased by sodium chloride, tert-butyl alcohol, propanol, sodium nitrite and acetic acid. By promoting or retarding indirect reaction of them with ? OH coexisting substances can enhance or restrain generally degradation reaction. The dissociation of 2,4-D and formation of hydroxyl radicals from ozone is increased by sodium phosphate, sodium carbonate, sodium silicate, sodium bicarbonate, because they can rise initial pH values of 2,4-D solution. Secondary, free radicals produced bythese coexisting substances can further promote 2,4-D degradation. Tap water and surface water contain generally different kind and amount of coexisting substances including sodium carbonate, sodium bicarbonate and so on, so they can also enhance 2,4-D degradation at some extent. Formic acid is initiator and promoter of hydroxyl radicals. Nitrate improves the indirect reaction and the direct reaction. Hydroxyl radical can be depleted by nitrite and annihilated by sodium chloride, tert-hutyl alcohol, propanol and acetic acid, leading to the decrease of 2,4-D degradation.关键词
臭氧/过氧化氢/2,4-D/共存物质/动力学Key words
ozone/ hydrogen peroxide/ 2,4-D/ coexisting substance/ kinetics分类
资源环境引用本文复制引用
陈岚,权宇珩..共存物质对O3/H2O2工艺降解2,4-D的影响(Ⅰ)2,4-D降解动力学[J].化工学报,2011,62(10):2920-2925,6.基金项目
河北省自然科学基金项目(B2009001371). （B2009001371）
