室温Fenton反应过程H_2O_2有效利用率的影响因素研究  

Research on Influencing Factors of the Availably Utilized Ratios of H_2O_2 in Fenton Reaction at Room Temperature

作　　者：邵晓梅[1] 陈玲[1] 刘德启[1] 李海青[1] 武银华[1] 

机构地区：[1]苏州大学材料与化学化工学部,江苏苏州215123

出　　处：《环境科学与管理》2009年第3期51-55,共5页Environmental Science and Management

基　　金："211工程"学科建设项目(R2317312)

摘　　要：Fenton反应是H2O2在Fe2+催化作用下产生氧自由基并氧化污染物的高效方法。但影响Fenton反应过程H2O2分解及其有效利用率的因素是很多的,其中[Fe2+]要求控制在3 mmol/L以上。酚类体系H2O2的有效利用率不受H2O2浓度变化的影响,但受初始COD的影响,一般表现为随COD的增加,H2O2有效利用率迅速增加。当初始COD一定时,H2O2浓度在600 mg/L和1 800 mg/L时,一元酚与二元酚体系的H2O2有效利用率均出现了两个峰值,前者的峰值分别为11.83 gCOD/gH2O2和12.99 gCOD/gH2O2,后者的峰值分别为9.01和11.95 gCOD/gH2O2。而醇类体系H2O2的有效利用率受H2O2浓度的影响较大,但与初始COD的关系不明显。当H2O2浓度低于300 mg/L时,乙醇比对照体系H2O2的分解率高1-3%,而有效利用率仅为0.6 gCOD/gH2O2;随H2O2用量的继续增加,其有效利用率趋于0 gCOD/gH2O2。而二元醇体系H2O2有效利用率与其浓度间呈"倒U"型规律,H2O2低于300 mg/L时,其有效利用率仅为1.25 gCOD/gH2O2;H2O2浓度在300 mg/L^900 mg/L之间时,其有效利用率可达8.96 gCOD/gH2O2;其后随着H2O2的增加,有效利用率迅速下降到与乙醇体系相当。在混合体系中,醇羟基和酚羟基所占比例对H2O2有效利用率也有显著的影响,当乙醇比例小于60%时,H2O2有效利用率稳定在13.0 gCOD/gH2O2;随乙醇比例的增加,其对H2O2的分解抑制效应表现出剂量依赖关系,H2O2有效利用率也逐渐下降到近于0 gCOD/gH2O2,说明这部分H2O2并没有得以有效地分解用于氧化废水中的COD,这在工程实践中应引起高度的重视。The Fenton reaction is a highly effective method using H2O2 to produce the oxygen free radical under the Fe^2＋ catalytic effeet and oxidizing the pollutant . But the free radical chain reaction is influenced by many factors, [ Fe^2＋ ] is required to control in 3 mmol/L; In the phenol＇s system, the availably utilized ratios of H2O2 were not influenced by its concentration but the COD of this system, generally,with the increasing of the COD, the availably utilized ratios H2O2 were increasing. When the COD was constant and the concentration of H2O2 was from 600 to 1 800 mg/L, there were two peaks of H2O2＇s availably utilized ratios in one phenol and dual phenol＇s systems respectively, the former peaks were 11.83 and 12.99 gCOD/gH2O2, the latter peaks were 9. 01and 11.95 gCOD/gH2O2. In the alcohol＇s system, the availably utilized ratios of H2O2 were influenced by the concentration of H2O2 obviously, but not the system＇s COD . When the concentration of H2O2 was less than 300 mg/L, the decomposition rate of H2O2 was higher by 1 -3 percent in the ethanol than the control system, and the availably utilized ratios were only 0. 6 gCOD/gH2O2. With the increasing of H2O2, its availably utilized ratios tended to 0 gCOD/gH2O2. In the system of 1,3 propanediol, the availably utilized ratios of H2O2 displayed an ＂inverted U＂ with its concentration inereasing, when the eoneentration of H2O2 was less than 300 mg/L, its availably utilized ratios were only 1.25 gCOD/gH2O2 ; but the availably utilized ratios H2O2 could be up to 8.96 gCOD/gH2O2 when the concentration H2 O2 is 300 mg/L -900 mg/L, later it fell rapidly to the level of ethanol. In the mixed system, the availably utilized ratios of H2O2 was also influenced obiviously by the proportion of phenol and alcohol, when the proportion of ethanol was less than 60%, the H2O2＇s availably utilized ratios stabilized in 13.0 gCOD/gH2O2 ; and when its proportion surpassed 60%, it displayed the dosage dependent inhibitory action and the H2O2＇s availably utilized rat

关 键 词：芬顿反应 H2O2有效利用率 乙醇 1 3丙二醇 苯酚 

分 类 号：X511[环境科学与工程—环境工程]