• 关键词：磺胺二甲基嘧啶(SMT)  辐照  过硫酸盐  过硫酸自由基  高级氧化技术

• 基金项目：国家自然科学基金青年科学基金项目（No.51508007）

• 刘元坤
• 北京工业大学建筑工程学院, 北京 100124

• 王建龙
• 清华大学核能与新能源技术研究院, 北京 100084

• 摘要：本研究对磺胺二甲基嘧啶（SMT）在不同条件下的辐照降解进行了研究.SMT（20 mg·L^-1，约0.072 mmol·L^-1）在外加过硫酸根浓度为0、1、2、4、10和20 mmol·L^-1条件下分别进行辐照，发现伽马辐照可有效去除水中的SMT，并可极大地促进溶液TOC的去除，过硫酸盐与伽马辐照联合作用表现出明显的协同效应.在本研究中，各条件下的辐照降解反应均符合准一级反应动力学.在外加过硫酸盐的条件下，溶液的矿化度可以得到极大的提高，当吸收剂量为1 kGy时，其矿化度由3.5%提高到22.8%，当吸收剂量为5 kGy时，矿化度由14.1%提高到70.1%.在辐解后的溶液中，利用IC检测到硫酸根离子（SO₄^2-）、甲酸根离子（HCOO^-）和乙酸根离子（CH₃COO^-）3种离子的存在，一部分中间产物通过GC-MS检测得到，常见的含氮离子（NO₂^-、NO₃^-和NH₄⁺+）并未在溶液中检测到.同时，本研究还深入探讨了SMT辐照降解机理和降解途径.

• Abstract：Radiolysis of sulfamethazine (SMT) was characterized under different conditions in this research. SMT solutions (20 mg·L^-1) were irradiated in the presence of 0, 1, 2, 4, 10 and 20 mmol·L^-1 S₂O₈^2-, respectively. The results show that gamma radiation was effective in both SMT degradation and TOC removal, and the synergistic effects of gamma radiation with persulfate (S₂O₈^2-) were obviously. The degradation reactions conformed to the pseudo-first-order reaction kinetics. With absorbed doses of 1 kGy to 5 kGy, TOC removal rates were dramatically elevated after S₂O₈^2- was added -3.5% to 22.8% and 14.1% to 70.1%, respectively. In the process, three ions (SO₄^2-, HCOO^- and CH₃COO^-) were detected to be released from the radiolytic solutions by ion chromatography (IC). Furthermore, complicated products were identified by GC-MS. The normal N-containing ions (NO₂^-, NO₃^- and NH₄⁺) were not detected in the process. The pathways and mechanisms for the radiolytic process in the aqueous solution were proposed.

• Key words：sulfamethazine (SMT)  gamma radiation  persulfate (S₂O₈^2-)  sulfate radical (SO₄^-·)  advanced oxidation process (AOPs)

• 
  摘要点击次数： 1564 全文下载次数： 2605