作者：XianglongKong,ChengwuZhang,JingyiZhang,LishuangXuan,ChuanyuQin 单位：KeyLaboratoryofGroundwaterResourcesandEnvironment,MinistryofEducation,JilinUniversity；JilinProvincialKeyLaboratoryofWaterResourcesandEnvironment,JilinUniversity；NationalandLocalJointEngineeringLaboratoryforPetrochemicalContaminatedSiteControlandRemediatio 本文刊于： 《Journal of Environmental Sciences》 2021年第02期
关键词:
Zerovalentiron Sulfidation TripolyphosphKeywords
Zero valent iron, Sulfidation, Tripolyphosphate, Oxalate, Oxygen activation
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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 O2.
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