Abstract Chlorinated organic pollutants (COPs) have caused serious contaminants in soil and groundwater, hence developing methods to remove these pollutants is necessary and urgent. By a simple hydrothermal method, we synthesized the bimetallic iron-nickel sulfide (FeNiS) particles which exhibited excellent catalytic property of COPs removal. FeNiS was chosen as the peroxydisulfate (PDS) activator to removal COPs including 4-chlorophenol (4-CP), 1,4-dichlorophenol (1,4-DCP) and 2,4,6-trichlorophenol (2,4,6-TCP). The results show that FeNiS can efficiently activate PDS to produce sulfate radical (SO4 −) which plays major role in the oxidative dechlorination and degradation due to its strong oxidizing property and the ability of producing hydroxyl radicals ( OH) in the alkaline condition. Meanwhile, the Cl− abscised from COPs during the dechlorination can turn into the chlorine radicals and enhance the degradation and cause further mineralization of intermediate products. This bimetallic FeNiS catalyst is a promising PDS activator for removal of chlorinated organics.

中文翻译：

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通过双金属铁镍硫化物活化过氧二硫酸盐有效去除氯化有机污染物

摘要氯化有机污染物（COPs）已对土壤和地下水造成了严重的污染，因此开发去除这些污染物的方法是必要和紧迫的。通过简单的水热法，我们合成了双金属铁镍硫化物（FeNiS）颗粒，该颗粒表现出优异的COPs去除催化性能。选择FeNiS作为过氧二硫酸盐（PDS）活化剂以去除COP，包括4-氯苯酚（4-CP），1,4-二氯苯酚（1,4-DCP）和2,4,6-三氯苯酚（2,4,6- TCP）。结果表明，FeNiS可以有效活化PDS产生硫酸根（SO4-），由于其强氧化性和在碱性条件下具有产生羟基自由基（OH）的能力，因此在氧化脱氯和降解中起主要作用。同时，在脱氯过程中从COP去除的Cl-可以转变为氯自由基，并促进降解并导致中间产物进一步矿化。这种双金属FeNiS催化剂是用于去除氯化有机物的有前途的PDS活化剂。