硫化纳米零价铁处理PCA-Pb(Ⅱ)复合污染体系
田耀宇 , 肖艳琳 , 孙浩欣 , 吴子钰 , 闫彤 , 汤波 , 王蒙
现代化工 ›› 2026, Vol. 46 ›› Issue (11) : 136 -144.
硫化纳米零价铁处理PCA-Pb(Ⅱ)复合污染体系
Sulfidated nanoscale zero-valent iron for PCA-Pb(Ⅱ) combined pollution treatment
为提高纳米零价铁(nZVI)对有机-重金属复合污染物的去除性能,制备不同质量负载比的硫化纳米零价铁(nZVI/S),对其去除对氯苯胺(PCA)和Pb(Ⅱ)的效果及机制进行了研究。采用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)和N2吸附—脱附表征材料结构,并考察pH、投加量、吸附动力学、吸附等温线、热力学及老化稳定性对去除过程的影响。结果表明,硫化改性改变了nZVI的晶相组成、表面官能团和孔结构,1nZVI/1S比表面积为37.69 m2/g。随投加量增加,PCA和Pb(Ⅱ)去除率均升高;当投加量为0.30 g/L及以上时,1nZVI/1S对PCA的去除率超过90%,对Pb(Ⅱ)接近完全去除。吸附过程以化学吸附和单分子层吸附为主,且具有自发吸热特征。机理分析表明,PCA主要通过表面富集、氢键和弱配位作用去除,Pb(Ⅱ)主要通过含硫位点结合、表面络合及PbS沉淀固定。老化15 d后,1nZVI/1S仍保持较高去除效率,表明其具有较好的稳定性和抗老化性能。
To improve the removal performance of nanoscale zero-valent iron (nZVI) for organic-heavy metal combined pollutants,sulfidated nanoscale zero-valent iron (nZVI/S) with different mass loading ratios was prepared,and its removal effects and mechanisms for p-chloroaniline (PCA) and Pb(Ⅱ) were studied.The materials were characterized by XRD,FT-IR,XPS and N2 adsorption-desorption,and the effects of pH,dosage,adsorption kinetics,isotherms,thermodynamics and aging stability were investigated.The results show that sulfidation modification changed the crystalline phase composition,surface functional groups and pore structure of nZVI,and the specific surface area of 1nZVI/1S was 37.69 m2/g.With increasing dosage,the removal efficiencies of PCA and Pb(Ⅱ) increased.When the dosage was 0.30 g/L or above,1nZVI/1S removed more than 90% of PCA and achieved near-complete Pb(Ⅱ) removal.The adsorption process was dominated by chemisorption and monolayer adsorption,with spontaneous and endothermic characteristics.Mechanism analysis indicates that PCA was mainly removed through surface enrichment,hydrogen bonding and weak coordination,whereas Pb(Ⅱ) was immobilized through sulfur-containing site binding,surface complexation and PbS precipitation.After 15 d of aging,1nZVI/1S still maintained high removal efficiency,indicating that it has good stability and anti-aging performance.
硫化纳米零价铁 / 对氯苯胺 / Pb(Ⅱ) / 复合污染 / 去除机制
sulfidated nanoscale zero-valent iron / p-chloroaniline / Pb(Ⅱ) / combined pollution / removal mechanism
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陕西省教育厅产业化培育项目(25JC035)
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