• 关键词：超声波  零价铁/过硫酸钾体系  柠檬酸镍络合废水  破络

• 基金项目：湖南省教育厅创新平台开放基金项目（No.16K087）；湖南省重点研发计划项目（No.2018SK2018）

• 肖泉
• 湘潭大学环境与资源学院, 复杂重金属废水高效净化与应用技术湖南省工程实验室, 湘潭 411105

• 田凯勋
• 湘潭大学环境与资源学院, 复杂重金属废水高效净化与应用技术湖南省工程实验室, 湘潭 411105

• 付显婷
• 湘潭大学环境与资源学院, 复杂重金属废水高效净化与应用技术湖南省工程实验室, 湘潭 411105

• 郑波
• 湘潭大学环境与资源学院, 复杂重金属废水高效净化与应用技术湖南省工程实验室, 湘潭 411105

• 摘要：以柠檬酸镍络合废水为目标废水，考察了超声波（US）强化零价铁（Fe⁰）/过硫酸钾（PS）体系的初始pH、过硫酸钾用量（C_PS）、超声波功率、零价铁与过硫酸钾质量比（m）、零价铁粒径（d_Fe⁰）对镍去除的影响.结果表明，在超声波功率为600 W，pH为3，过硫酸钾用量为0.45 g·L^-1，Fe⁰：PS（质量比）为0.8，零价铁粒径为75 μm的条件下反应60 min时，镍的去除率可以达到100%.不同体系的对照实验和反应前后零价铁SEM、EDS分析结果表明，US/Fe⁰/PS体系效果明显优于US/Fe⁰、US/PS和Fe⁰/PS体系，超声波对Fe⁰/PS体系具有强化作用，能促进零价铁持续释放具有催化作用的Fe²⁺.最后，通过红外光谱和紫外光谱分析了柠檬酸镍破络机理.TOC变化规律表明，体系矿化速率低于体系中柠檬酸的降解速率，说明柠檬酸镍降解首先是一个快速破络过程，随后是破络后的中间产物进一步降解矿化.

• Abstract：Citric acid nickel complex, the probe pollutant, was treated by zero-valent iron (Fe⁰)/potassium persulfate (PS) system enhanced by ultrasound (US). The effects of the initial solution pH, concentration of PS, ultrasonic power, mass ratio of Fe⁰ to PS, and the Fe⁰ particle size on the nickel removal efficiency were studied. The results show that the nickel removal efficiency reached 100% for the first 60 minutes under the conditions of the ultrasonic power of 600 W, initial pH of 3~9, PS dosage of 450 mg·L^-1, m (Fe⁰:PS) of 0.8 and iron particle size of 75 μm. Results of The comparative experiments imply that the nickel removal efficiency in US/Fe⁰/PS system was superior to US/Fe⁰, US/PS and Fe⁰/PS system, and the ultrasound contributed to successive release of Fe²⁺ originating from zero-valent iron. The mechanism of complex breaking was analyzed through infrared and ultraviolet spectrum. The TOC variation during the reaction indicates that the mineralization rate of the system was lower than the degradation rate of citric acid in the system, which means that the breakup of nickel citrate was a quicker process, while the degradation of intermediate product was relatively slower. Zero-valent iron before and after the reaction was characterized with SEM and EDS, and the mechanism of ultrasonic enhanced zero-valent iron/potassium persulfate degradation of nickel citrate was proposed.

• Key words：ultrasonic  zero-valent iron/potassium persulfate system  nickel citrate complex wastewater  break complex

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