HA/H2O2体系对磺胺噻唑降解的机理与效能
Mechanism and Efficiency of HA/H2O2 System for Sulfa thiazole Degradation
武玮 1郑伟杰 2许荣刚 3罗从伟 1任会学 1陈飞勇1
作者信息
- 1. 山东建筑大学市政与环境工程学院,资源与环境创新研究院,山东济南 250101
- 2. 济南市市政工程设计研究院<集团>有限责任公司,山东济南 250101
- 3. 同圆设计集团股份有限公司,山东济南 250101
- 折叠
摘要
以盐酸羟胺/过氧化氢(HA/H2O2)作为研究体系,考察其对于磺胺噻唑(STZ)的降解效能.文章考察了 HA初始浓度、H2O2初始浓度、STZ初始浓度、pH、天然有机物(NOM)、阴离子(SO42-、Cl-和NO3-)对STZ降解的影响.结果表明:在pH值=3.0的条件下,HA/H2O2体系对STZ具有高效的降解效果,当HA的物质的量浓度由2 mmol/L增加到10 mmol/L时,对STZ的去除率从56.06％增加到85.26％;当H2O2的物质的量浓度从2 mmol/L增加到10 mmol/L时,对STZ的去除率从58.96％增加到85.26％,当STZ的物质的量浓度从2 μmol/L增加到10 μmol/L时,对STZ的去除率从98.72％降低到71.86％.随着pH的增大,STZ的去除率逐渐降低,在pH值>7的条件下对STZ的去除率可以忽略不计.向反应体系中分别投加5 mmol/L的SO42-和5 mmol/L的NO3-都可以有效促进STZ的降解,而5 mmol/L的Cl-则会抑制STZ的降解.当向体系中投加小于5 mg/L的NOM则对STZ的降解的影响可以忽略不计.测定了体系中共有17种降解产物,并推测STZ通过取代反应、羟基化反应等方式逐步被降解.通过明亮发光杆菌发光值变化分析降解过程中溶液毒性的变化,测定发现STZ降解过程中急性毒性不高.实际水体试验结果表明,HA/H2O2系统对二级出水中的荧光类物质具有较好的降解效果.
Abstract
Hydroxylamine hydrochloride/peroxide(HA/H2O2)was employed as the research system to examine the mechanism and efficiency of sulfathazole(STZ).The effects of initial concentrations of HA,H2O2,STZ,pH,natural organic matter(NOM),and anions(SO42-,Cl-and NO3-)on degradation of STZ were examined.The results indicated that under pH value=3.0 conditions,the HA/H2O2 system exhibited efficient degradation of STZ.When the concentration of HA increased from 2 mmol/L to 10 mmol/L,the removal efficiency of STZ increased from 56.06％to 85.26％.Similarly,increasing the concentration of H2O2 from 2 mmol/L to 10 mmol/L resulted in an increase in STZ removal efficiency from 58.96％to 85.26％.However,when the concentration of STZ increased from 2 μmol/L to 10 μmol/L,the removal efficiency decreased from 98.72％to 71.86％.With increasing pH,the removal rate of STZ gradually decreased,and the removal rate of STZ could be neglected under conditions of pH>7.The addition of 5 mmol/L of SO4-and 5 mmol/L of NO3 to the reaction system effectively promoted the degradation of STZ,while 5 mmol/L of Cl-inhibited STZ degradation.The impact of NOM at concentrations less than 5 mg/L on STZ degradation could be ignored.Seventeen degradation products were identified in the system,suggesting that STZ was gradually degraded through substitution reactions,hydroxylation reactions,and other pathways.Analysis of changes in solution toxicity during the degradation process using bioluminescent bacteria luminescence values showed that the acute toxicity during STZ degradation was not high.Actual water body experiments demonstrated that the HA/H2O2 system has a good degradation effect on fluorescent substances in secondary effluent.
关键词
盐酸羟胺/过氧化氢(HA/H2O2)/磺胺噻唑(STZ)/氧化降解/产物分析/急性毒性Key words
hydroxylamine hydrochloride/peroxide(HA/H2O2)/sulfathiazole(STZ)/oxidative degradation/product analysis/acute toxicity引用本文复制引用
基金项目
山东省重点研发计划(重大科技创新工程)项目(2023CXGC010904)
国家自然科学基金面上项目(52270200)
山东省引进顶尖人才"一事一议"项目(0031504)
济南市市校融合发展战略工程项目(JNSX2021048)
出版年
2024
国家科技期刊平台
NSTL
万方数据