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作 者:梁晓雅 赵丹[1] 董延茂[2] 范书祺 巫衡 朱雨婷 LIANG Xiaoya;ZHAO Dan;DONG Yanmao;FAN Shuqi;WU Heng;ZHU Yuting(College of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China;College of Chemical Life and Science,Suzhou University of Science and Technology,Suzhou 215009,China)
机构地区:[1]苏州科技大学环境科学与工程学院,江苏苏州215009 [2]苏州科技大学化学生命与科学学院,江苏苏州215009
出 处:《环境科学与技术》2025年第4期65-77,共13页Environmental Science & Technology
基 金:苏州区域水质改善和水生态安全技术与综合示范项目(2017ZX07205);苏州市产业化前瞻项目(SYG201744);国家自然科学基金项目(22202142);苏州市科技计划项目(SYC2022150)。
摘 要:文章采用水热-共沉淀-原位生长法制备了CeO_(2)/γ-Bi_(2)MoO(6 CBM)复合材料,通过SEM、XRD、XPS、FTIR、EPR、ICP-OES及UV-Vis DRS等手段对其结构和性质进行表征,并评估了CBM活化过一硫酸盐(PMS)降解罗丹明B(RhB)的性能,以及阴离子和腐殖酸对RhB降解的影响。结果表明,在中性条件(pH=7)、PMS浓度为1 mmol/L、催化剂用量为5 mg/L、RhB的浓度为30 mg/L的条件下,CBM在14 min内对RhB的降解率达到99.9%。动力学分析表明,该催化氧化过程符合准一级反应动力学模型。通过自由基淬灭实验和电子顺磁共振测试,确定了该体系中的主要活性物质为单线态氧(^(1)O_(2))、羟基自由基(·OH)和硫酸根自由基(SO_(4)^(-)·),并基于此提出了可能降解的机理。进一步的循环实验显示,CBM在经历5次重复使用后,RhB的降解效率仍可保持在88.4%,表明其具有良好的催化稳定性和可重复使用性。CeO_(2)/γ-Bi_(2)MoO_(6)(CBM)composites were successfully prepared using a hydrothermal-co-precipitation-in situ growth method and characterized using SEM,XRD,XPS,FTIR,EPR,ICP-OES,and UV-Vis DRS to analyze their structural and functional properties.The study assessed the performance of CBM in activating peroxymonosulfate(PMS)for the degradation of Rhodamine B(RhB)and explored the impact of anions and humic acids on the degradation process.Under neutral conditions(pH=7),with a PMS concentration of 1 mmol/L,a catalyst dosage of 5 mg/L,and an RhB concentration of 30 mg/L,CBM achieved a RhB degradation rate of 99.9%within 14 minutes.Kinetic analysis revealed that the catalytic oxidation process followed a pseudo-first-order reaction kinetic model.Through radical quenching experiments and electron paramagnetic resonance tests,the primary reactive species in the system were identified as singlet oxygen(^(1)O_(2)),hydroxyl radicals(·OH),and sulfate radicals(SO_(4)^(-)·).A possible degradation mechanism was proposed based on these findings.Furthermore,recycling experiments demonstrated that CBM retained 88.4%of its RhB degradation efficiency after five reuse cycles,highlighting its excellent catalytic stability and reusability.
分 类 号:X703.1[环境科学与工程—环境工程]
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