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311.
以甲酸为活化剂,耦合热活化过硫酸钠技术产生还原性二氧化碳阴离子自由基(CO2·-),从而还原去除水溶液中四氯化碳(CT)和Cr(VI),考察过硫酸钠和甲酸初始浓度的影响以及复合污染处理效果.结果表明:当过硫酸钠与甲酸浓度均为100mmol/L时,单独CT或Cr(VI)分别在120min、60min内基本完全去除(50℃),且污染物去除效率随过硫酸钠及甲酸浓度升高而增强.在CT和Cr(VI)复合污染体系中,Cr(VI)的存在能够抑制CT降解,且抑制程度随Cr(VI)初始浓度升高而提高,但Cr(VI)去除率随CT初始浓度增大而升高.加入CO2·-猝灭剂(甲基紫精)能够抑制CT降解,但促进Cr(VI)去除,表明有机物的存在能够增强Cr(VI)去除效率. 相似文献
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313.
The aim of the present study was to investigate the effect of several β‐adrenergic blockers and related compounds with respect to generation of reactive oxygen species, especially hydroxyl radicals. Measurements were done using a chemiluminescence technique and the Co(II)‐EDTA + H2O2 system as a source of active oxygen species. 相似文献
314.
Wenchao Jiang Ping Tang Shuguang Lu Xiang Zhang Zhaofu Qiu Qian Sui 《Frontiers of Environmental Science & Engineering》2018,12(2):6
315.
探究了小分子有机醇对过二硫酸盐(Peroxydisulfate, PDS)氧化降解二苯甲酮-3(Benzophenone-3, BP-3)的强化作用及反应机制.研究结果表明,4种有机醇(甲醇、丙醇、乙二醇和丙三醇)均在一定浓度范围内能有效促进过硫酸盐氧化降解BP-3,BP-3的降解速率随醇类分子碳链长度和羟基数目的增加而增加,增强效果依次为丙三醇>乙二醇>丙醇>甲醇.在低添加量时(21.9~350 μmol·L-1),有机醇的添加增加了BP-3降解速率,但随着醇量的增加呈现出先增大后减小的趋势,例如丙三醇添加量从21.9 μmol·L-1增加到87.6 μmol·L-1,BP-3降解动力学常数从2.91×10-4 s-1提高到3.58×10-4 s-1,增加了0.23倍;但加入过多的醇却抑制了BP-3的降解,例如丙三醇添加量从87.6 μmol·L-1进一步增加到350 μmol·L-1,BP-3降解速率降低29.0%(2.54×10-4 s-1).反应温度也能有效促进醇的强化作用,温度从40 ℃升至60 ℃,添加丙三醇87.6 μmol·L-1,BP-3的降解速率常数从6.84×10-6 s-1提高至6.69×10-4 s-1,提高了96.8倍.小分子有机醇主要是通过与·OH反应产生醇自由基,进一步激活过硫酸盐产生SO4·-,显著增加了SO4·-的产率,从而加速过硫酸盐降解BP-3的效率. 相似文献
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318.
ZHAN Manjun 《环境科学学报(英文版)》2009,21(3)
Reactive oxygen species (ROS) can be produced by interactions between sunlight and light-absorbing substances in natural water environment. ROS may participate in the indirect photolysis of trace organic pollutants, therefore resulting in the changing of their environmental fates and ecological risks in natural water system. Bisphenol A (BPA), an endocrine-disrupting chemical, exits widely in natural water. The photodegradation of BPA promoted by ROS (·OH, 1O2, HO2·/O2·-) which were produced on the excitation of ubiquitous constituents (such as nitrate ion, humic substances and Fe(III)-oxalate complexes) in natural water under simulated solar radiation was investigated. Both molecular probe method and electron spin resonance (ESR) test were used for the determine the characterization of generated ROS. It was found that ·OH was photochemically produced with the presence of nitrate ion, humic substances and Fe(III)-oxalate complexes and 1O2 was produced with the presence of humic substances. The steady-state concentrations of ·OH was 1.27×10-14 mol/L in nitrate ion, and the second-order rate constant of BPA with ·OH was 1.01×1010L/( mol·s). 相似文献
319.
ZHAN Manjun 《环境科学学报(英文版)》2009,21(3):303-306
Reactive oxygen species(ROS) can be produced by interactions between sunlight and light-absorbing substances in natural water environment.ROS may participate in the indirect photolysis of trace organic pollutants,therefore resulting in changes in their environmental fates and ecological risks in natural water systems.Bisphenol A(BPA),an endocrine-disrupting chemical,exits widely in natural waters.The photodegradation of BPA promoted by ROS(.OH,1O2,HO2./O2·-),which were produced on the excitation of ubiquito... 相似文献
320.
Hydroxyl radicals play the key role during electrochemical oxidation and photoelectrochemical oxidation. The production and e ect
of hydroxyl radicals on the interface between DSA anode and water was investigated by examining the quenching e ect of iso-propanol
on Orange II decolorization. We observed that with an increase in electrode potential from 4 to 12 V across electrodes at pH 7.0, the
contribution percentage of hydroxyl radicals increased dramatically. More OH radicals were produced in acidic and alkaline conditions
than at neutral conditions. At electrode potential of 4 V, the contribution percentage of hydroxyl radicals was obviously higher at near
neutral pH conditions, while removal e ciency of Orange II achieved was the lowest concurrently. Finally, for photocatalytic oxidation,
electrochemical oxidation, and photoelectrochemical oxidation using the same DSA electrode, the e ect of hydroxyl radicals proved
to be dominant in photocatalytic oxidation but the contribution of hydroxyl radicals was not dominant in electrochemical oxidation,
which implies the necessity of UV irradiation for electrochemical oxidation during water treatment. 相似文献