热活化过硫酸盐降解典型选矿药剂苯甲羟肟酸  

Degradation of Typical Mineral Processing Agent Benzohydroxamic Acid by Heat-Activated Persulfate

作　　者：王健行 张青青 曾亦婷 谢心怡 王赵鹏 王春英[1] WANG Jianxing;ZHANG Qingqing;ZENG Yiting;XIE Xinyi;WANG Zhaopeng;WANG Chunying(Jiangxi Provicinal Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学矿冶环境污染防控江西省重点实验室,江西赣州341000

出　　处：《有色金属工程》2024年第5期143-154,共12页Nonferrous Metals Engineering

基　　金：国家重点研发计划(2019YFC1805100);江西理工大学清江青年英才支持计划项目(JXUSTJYX2016003);江西省自然科学基金面上项目(20232BAB203040)。

摘　　要：采用热活化过硫酸钾(PS)降解典型选矿药剂苯甲羟肟酸(BHA),考察不同温度、PS浓度、BHA浓度、pH及阴阳离子等条件对BHA降解效果的影响,分析降解产物及体系活性物种以明确体系降解机理,并通过绿豆芽发芽试验验证降解体系毒性变化。结果表明:PS浓度越高,温度越高降解效果越好,在70℃及1.5 mmol/L PS的条件下,反应120 min后,20 mg/L BHA的降解率达91.3%;强酸性和强碱性条件均能促进BHA的降解;HCO_(3)^(-)、SiO_(3)^(2-)和Cu^(2+)促进了BHA的去除;降解过程以SO_(4)^(-)·氧化为主。热活化PS降解BHA的主要中间产物为苯甲酸和羟胺,且Cu^(2+)的存在促进了羟胺到气态氮的转化。绿豆发芽试验证明经降解后的反应体系毒性较原始溶液明显下降。A typical mineral processing agent benzohydroxamic acid(BHA)was degraded by thermally activated potassium persulfate(PS).The effects of temperature,PS concentration,BHA concentration,pH and anions on the degradation effect of BHA were investigated.The degradation mechanism was determined by analyzing the degradation products and the active species of the system,and the toxicity of the degradation system was verified by the germination experiment of mung bean.The results showed that the higher the concentration of PS and the higher the temperature,the better the degradation effect.Under the condition of 70℃ and 1.5 mmol/L of PS,the removal rate of 20 mg/L BHA reached 91.34%in 120 min.The degradation of BHA was promoted by both strong acidic and alkaline conditions.HCO_(3)^(-),SiO_(3)^(2-),and Cu 2+were beneficial to the removal of BHA.SO-4·played an important role in the degradation of BHA during the thermally-activated PS system.The main products of BHA were benzoic acid and hydroxylamine,and the adding of Cu^(2+)promoted the transformation of hydroxylamine to gaseous nitrogen.The mung bean germination test showed that the toxicity of the beneficiation wastewater after treatment was significantly lower than that of the original solution.

关 键 词：热活化 过硫酸钾 苯甲羟肟酸 选矿废水 

分 类 号：X703[环境科学与工程—环境工程]