摘要
为实现农业废弃物水稻秸秆(RS)的再利用,使用高锰酸钾和水稻秸秆在室温条件下制备负载MnO_(2)的水稻秸秆材料(neMRS),活化过一硫酸盐(PMS)以降解左氧氟沙星(LEV)。首先利用高锰酸钾的氧化性和氧化秸秆的纤维素结构,将MnO_(2)负载在水稻秸秆表面。然后用扫描电镜(SEM)、X射线衍射光谱(XRD)、傅里叶变换红外光谱(FTIR)和X射线光电子能谱(XPS)等一系列表征证明,MnO_()2成功负载在neMRS表面,neMRS表面的Mn含量为415.4 mg/g。neMRS对LEV有16.7%的吸附率,neMRS/PMS对LEV的去除率约为RS/PMS的4倍。继而在pH值、PMS投加量、材料投加量以及LEV浓度等不同条件下探究neMRS/PMS体系对LEV的降解性能。结果表明,neMRS表现出较高的催化性能,在不同的条件下对LEV的去除率均大于90%。最后利用猝灭实验和EPR分析发现,neMRS通过活化PMS产生·O_(2)^(-)和1O_(2)参与LEV的降解。对于实际水体中的LEV,neMRS也有较好的去除效果,最高去除率可达到99.8%。
To achieve the reuse of agricultural waste rice straw,a MnO_(2)-loaded rice straw material(neMRS)was prepared through the oxidation of potassium permanganate and cellulose structural modification under ambient conditions.This material was subsequently employed to activate peroxymonosulfate(PMS)for levofloxacin(LEV)degradation.The successful immobilization of MnO_(2) on the neMRS surface was systematically confirmed via comprehensive characterization techniques,including scanning electron microscopy(SEM),X-ray diffraction(XRD),Fourier-transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS),with a surface Mn content of 415.4 mg/g.The neMRS alone demonstrated a 16.7%adsorption rate for LEV,while the neMRS/PMS system achieved a LEV removal rate approximately four fold higher than the RS/PMS system.Further investigations under varying operational parameters(pH,PMS dosage,catalyst loading,and LEV concentration)exhibited that the neMRS/PMS system maintained superior catalytic performance with LEV removal rates exceeding 90%across all tested conditions.Quenching experiments combined with electron paramagnetic resonance(EPR)analysis revealed that the degradation mechanism primarily involved reactive oxygen species(·O_(2)^(-) and 1O_(2))generated through PMS activation by neMRS.Notably,the system achieved exceptional LEV removal efficiency of up to 99.8%in real water matrices,demonstrating its significant potential for practical environmental applications.
作者
赵彤
殷嘉迈
黄卫
王志国
张纯
王琼超
喻鹏
ZHAO Tong;YIN Jiamai;HUANG Wei;WANG Zhiguo;ZHANG Chun;WANG Qiongchao;YU Peng(College of Chemistry and Materials Science,Hunan Agricultural University,Changsha 410128,China)
出处
《晓庄学院自然科学学报》
北大核心
2025年第3期1-10,共10页
Journal of Natural Science of Hunan Normal University
基金
湖南农业大学学科交叉研究青年引导项目(2024XKJC03)
江西省井冈山农高区省级科技专项课题(20222-051245-04)。
关键词
水稻秸秆
高锰酸钾
高级氧化
过一硫酸盐
rice straw
potassium permanganate
advanced oxidation
peroxymonosulfate
