电气石活化过硫酸盐降解四环素的影响因素

Factors influencing the degradation of tetracycline by tourmaline activated persulfate

本研究以具有自发极化性和丰富活性中心的电气石作催化剂,活化过硫酸盐协同降解水环境中的四环素(TC),重点揭示其协同降解机理、最佳反应条件与稳定性,为修复抗生素污染水体提供了新思路。实验结果表明,电气石存在的表面电场和自发极化效应能够对过硫酸盐起到活化作用并产生大量·OH和SO_(4)^(–)·,从而氧化降解TC;在60℃,pH=5的条件下,120 min内,电气石与过硫酸盐体系中TC的清除率能够达到98.23%。经过5次循环利用,TC去除率仍然可以达到近90%,且电气石基本保持与初始状态基本相似的活性与结构稳定性,表明利用电气石高效活化过硫酸盐可以实现TC的低成本、高效降解。

In this research,tourmaline with spontaneous polarization and active centers has been used as a catalyst to activate persulfate for the degradation of tetracycline(TC)in aquatic environments.The aims of this research are to reveal the mechanism,optimal reaction conditions,and stability of its synergistic degradation,and to provide new ideas for the remediation of antibiotic-contaminated water.The experimental results indicate that the surface electric field and spontaneous polarization of tourmaline can activate persulfate to produce a large amount of•OH and SO_(4)^(–)•,which caused the oxidation and degradation of the TC.At the temperature of 60℃ and pH value of 5,the removal rate of TC in the tourmaline and persulfate system can reach up to 98.23%within 120 min.After 5 times of recycling,the TC removal rate by the tourmaline activated persulfate remains at nearly 90%,and the tourmaline has remained basically similar activity and structural stability relative to the initial state of tourmaline.These suggest that the tourmaline efficiently activated persulfate can lead to the low-cost and effective degradation of the TC.