摘要
利用真空紫外(VUV)活化过氧化氢(H_(2)O_(2))产生更多的活性氧(ROS)对染料进行脱色去除,考察H_(2)O_(2)投加量、溶液初始pH值以及染料初始浓度对体系降解酸性红G(ARG)和罗丹明B(RhB)的影响。结果表明,H_(2)O_(2)投加量为3 mmol/L时,80 mg/L的ARG和RhB在7 min时脱色率分别可达到96.3%和98.4%,ARG和RhB的去除率随着初始H_(2)O_(2)浓度的增加而增大,但超过3 mmol/L时,对染料的促进作用受到限制。染料脱色过程符合准一级动力学模型。在酸性条件下,染料的脱色降解拥有更高的效率,而碱性环境下降解受到了抑制作用。自由基捕获实验及EPR检测结果表明,羟基自由基(·OH)和单线态氧(^(1)O_(2))是主要的ROS,·OH占主要作用。无机阴离子(HCO_(3)^(-)、Cl^(-)、NO_(3)^(-)、SO_(4)^(2-))存在会抑制染料降解。通过紫外可见吸收光谱分析,初步推断ARG通过苯环先遭受攻击,之后偶氮键和萘环断裂,然后矿化;RhB主要是共轭结构破坏、N-位脱乙基、芳环开裂及矿化。
Using vacuum ultraviolet(VUV)to activate hydrogen peroxide(H_(2)O_(2))to generate more reactive oxygen species(ROS)for decolorization and removal of dyes.The effects of H_(2)O_(2)dosage,initial pH value of the solution,and initial dye concentration on the degradation of Acid Red G(ARG)and Rhodamine B(RhB)in the system were investigated.The results showed that when the dosage of H_(2)O_(2)was 3 mmol/L,the decolorization rate of ARG and RhB at 80 mg/L could reach 96.3%and 98.4%respectively at 7 min.The removal rate of ARG and RhB increased with the increase of initial H_(2)O_(2)concentration,but their promoting effect on the dye was limited when the concentration exceeded 3 mmol/L.The dye decolorization process follows a quasi first order kinetic model.Under acidic conditions,the decolorization and degradation of dyes have higher efficiency,while degradation is inhibited in alkaline environments.The free radical capture experiment and EPR detection results indicate that hydroxyl radicals(·OH)and singlet oxygen(^(1)O_(2))are the main ROS,with·OH accounting for the main role.The presence of inorganic anions(HCO_(3)^(-),Cl^(-),NO_(3)^(-),SO_(4)^(2-))can inhibit dye degradation.Through UV visible absorption spectroscopy analysis,it is preliminarily inferred that ARG is first attacked through the benzene ring,followed by the cleavage of azo bonds and naphthalene rings,and then mineralization;RhB mainly involves the destruction of conjugated structures,N-site deethylation,aromatic ring cracking,and mineralization.
作者
陈徐庆
唐玉朝
伍昌年
朱先胜
陈彩虹
马雪雨
王坤
尹翠琴
高和气
CHEN Xuqing;TANG Yuchao;WU Changnian;ZHU Xiansheng;CHEN Caihong;MA Xueyu;WANG Kun;YIN Cuiqin;GAO Heqi(Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse,Anhui Jianzhu University,Hefei 230601,China;Hefei Water Supply Group Co.,Ltd.,Hefei 230011,China)
出处
《应用化工》
CAS
CSCD
北大核心
2024年第7期1587-1593,共7页
Applied Chemical Industry
基金
国家自然科学基金(52370001)
安徽省自然科学基金(2208085US20)
安徽省教育厅创新团队项目(2022AH010019)。
