Redox control for electrochemical dechlorination of trichloroethylene in bicarbonate aqueous media.
Redox control for electrochemical dechlorination of trichloroethylene in bicarbonate aqueous media.
复制标题
DOI：
10.1021/es200943z
复制
发表时间：
2011-08-01
影响因子：
11.4
通讯作者：
Alshawabkeh, Akram N.
中科院分区：
文献类型：
--
作者：
Mao, Xuhui;Ciblak, Ali;Amiri, Mohammad;Alshawabkeh, Akram N.
使用批量混合电解质实验评估了铁阳极对三氯乙烯水溶液 (TCE) 电化学脱氯的作用。据报道，当使用铁阳极和泡沫铜阴极时，脱氯率显着提高，高达 99%。与释放氧气的惰性阳极相比，铸铁阳极会产生亚铁物质，将电解质调节至还原状态（低ORP值）并有利于TCE的还原。泡沫铜阴极上TCE电化学还原的主要产物为乙烯和乙烷。这两种碳氢化合物气体的比例随电解质ORP条件和电流密度的变化而变化，因为在还原性更强的电解质条件和更高的电流条件下产生更多的乙烷气体。采用伪一阶模型来描述TCE的降解，一阶速率常数（k）随着施加的电流而增加，但与初始浓度呈负相关。根据电流的不同，铁阳极电解会导致 ORP 降低和混合电解质 pH 值升高。本研究中反应速率的提高表明，使用泡沫铜和铁阳极进行电化学还原可能是修复被氯化有机化合物污染的地下水的一种有前景的方法。
The role of iron anode on electrochemical dechlorination of aqueous trichloroethylene (TCE) is evaluated using batch mixed-electrolyte experiments. A significantly higher dechlorination rate, up to 99%, is reported when iron anode and copper foam cathodes are used. In contrast to the oxygen-releasing inert anode, the cast iron anode generates ferrous species, which regulate the electrolyte to a reducing condition (low ORP value) and favor the reduction of TCE. The main products of TCE electrochemical reduction on copper foam cathode include ethene and ethane. The ratio of these two hydrocarbons gases varied with the electrolyte ORP condition and current density as more ethane gas generates at more reducing electrolyte condition and at higher current condition. A pseudo-first order model is used to describe the degradation of TCE, the first order rate constant (k) increased with the current applied, but exhibits a negative relation with initial concentration. Depending on the current, electrolysis by iron anode causes a reduction in the ORP and an increase in the pH of the mixed electrolyte. Enhanced reaction rates in this investigation indicate that the electrochemical reduction using copper foam and iron anode may be a promising process for remediation of groundwater contaminated with chlorinated organic compounds.
登录
查看更多内容
影响因子：
3.4
作者：
Aulenta, Federico;Canosa, Andrea;Majone, Mauro
通讯作者：
Majone, Mauro
影响因子：
6.6
作者：
Scialdone, Onofrio;Galia, Alessandro;Randazzo, Serena
通讯作者：
Randazzo, Serena
影响因子：
13.6
作者：
Sengil, I. Ayhan;ozacar, Mahmut
通讯作者：
ozacar, Mahmut
影响因子：
1.6
作者：
Sonoyama, N;Hara, K;Sakata, T
通讯作者：
Sakata, T
影响因子：
8.8
作者：
Al-Abed, Souhail R.;Fang, Yuanxiang
通讯作者：
Fang, Yuanxiang