Oxidative degradation of phenol by sulfidated zero valent iron under aerobic conditions:The effect of oxalate and tripolyphosphate ligands  

作　　者：Xianglong Kong Chengwu Zhang Jingyi Zhang Lishuang Xuan Chuanyu Qin 

机构地区：[1]Key Laboratory of Groundw ater Resources and Environment,Ministry of Education,Jilin University,Changchun 130021,China [2]Jilin Prouindal Key Laboratory of Water Resources and Enuironment,jinin University,Changchun 130021,China [3]National and Local Joint Engineering Laboratory for Petrochem ical Contaminated Site Control and Remediation Technology,Jilin University,Changchun 130021,China

出　　处：《Journal of Environmental Sciences》2021年第2期82-89,共8页环境科学学报（英文版）

基　　金：the National Key R&D Program of China(No.2018YFC1802500);the Key Project of National Natural Science Foundation of China(No.41530636);“the Fundamental Research Funds for the Central Universities”。

摘　　要：After adding either organic or inorganic ligands,sulfidated nano-zero-valent iron(Sn ZVI)was used for aerobic degradation of phenol,and the effect of the ligand species on oxidation performance was investigated.We found that Sn ZVI hardly degraded phenol in the absence of ligand addition.Ligands initiated and promoted the degradation of pollutants by Sn ZVI.The data herein show that a characteristic inorganic ligand,tripolyphosphate(TPP),is more effective in enhancing oxidation than a characteristic organic ligand oxalate.In addition to the scavenging of reactive oxidants by the organic ligand,more ferrous ion(Fe(Ⅱ))dissolution from Sn ZVI in the TPP system is another cause for the superior enhancement by the inorganic ligand.In the oxalate system,as the sulfur content of Sn ZVI increased,the oxidation efficiency increased because Fe S shell promoted the transfer of electrons to produce more reactive oxygen species(ROS).In TPP system,the effect of sulfur content on oxidation performance is more complex.The Sn ZVI with low sulfur content showed poor oxidation performance compared with that of n ZVI.Further experiments proved that sulfidation might weaken the complexation of TPP with surface bound Fe,which would slow down the ionic Fe(II)dissolution rate.Therefore,sulfidation has the dual effects of enhancing electron transfer and inhibiting the complexation of inorganic ligands.In addition,the mechanisms of ROS generation in different ligand systems were investigated herein.Results showed that the critical ROS in both the oxalate and TPP systems are hydroxyl radicals,and that they are produced via one-electron activation of O_(2).

关 键 词：Zero valent iron SULFIDATION TRIPOLYPHOSPHATE OXALATE Oxygen activation 

分 类 号：X703[环境科学与工程—环境工程]