无机材料学报2023，Vol.38Issue(11)：1281-1291,中插3-中插5,14.DOI:10.15541/jim20230209
粉煤灰衍生水合硅酸钙PEI改性及吸附去除Cu(Ⅱ)与催化降解有机污染物
PEI Modified Hydrated Calcium Silicate Derived from Fly Ash and Its adsorption for Removal of Cu(Ⅱ)and Catalytic Degradation of Organic Pollutants
摘要
Abstract
With the rapid development of industry,copper metal pollution in wastewater discharged from related manufacturing fields has become increasingly serious.Meanwhile,demand for copper metal resources in the field of catalysis is increasing.In this study,low-cost modified calcium silicate hydrate(PCSH)was prepared using fly ash and modifier polyethyleneimine(PEI)for the adsorption of heavy metal copper ions(Cu(Ⅱ))in aqueous solution,and then the Cu(Ⅱ),immobilized on the surface,was further treated with alkali to form copper-based active material for catalytic degradation of organic pollutants.Compared with unmodified sample(CSH),the maximum adsorption capacity of PCSH for Cu(Ⅱ)was increased by 100%with the maximum of 588 mg/g.The main reason was that the addition of PEI facilitated formation of larger specific surface area,excellent pore structure and strong complexation between Cu(Ⅱ)and-NH2.The copper-based catalysts,which obtained from PCSH exhibiting spindle-shaped porous morphology,could catalyze the oxidative degradation of rhodamine B(RhB)by activating potassium peroxymonosulfate(PMS)and the reduction of 4-nitrophenol(4-NP)by activating sodium borohydride(NaBH4),with rate constants of 0.7135/min(pH(7.0±0.3);[RhB]= 20 mg/L;[PMS]= 0.12 g/L;[catalyst]= 0.8 g/L)and 11.47×10-3/s(pH(11.0±0.3);[4-NP]= 10-4 mol/L;[NaBH4]= 5×10-3 mol/L;[catalyst]= 0.167 g/L),respectively,about 20 and 19 times as large as those of CSH catalyst system,respectively.The present work achieves the reuse of copper element in aqueous solution by using solid waste fly ash,which provides new insights into effective treatment and utilization of pollutants in water.关键词
粉煤灰/水合硅酸钙/铜离子吸附/聚乙烯亚胺/过氧硫酸氢钾Key words
fly ash/calcium silicate hydrate/Cu(Ⅱ)adsorption/polyethyleneimine/potassium peroxymonosulfate分类
资源环境引用本文复制引用
汤亚,孙盛睿,樊佳,杨庆峰,董满江,寇佳慧,刘阳桥..粉煤灰衍生水合硅酸钙PEI改性及吸附去除Cu(Ⅱ)与催化降解有机污染物[J].无机材料学报,2023,38(11):1281-1291,中插3-中插5,14.基金项目
国家自然科学基金(51878647,52272082) （51878647,52272082）
太仓市基础研究计划(TC2020JC08) （TC2020JC08）
江苏省高等学校重点学科建设(PAPD)National Natural Science Foundation of China(51878647,52272082) （PAPD）
Taicang Basic Research Program(TC2020JC08) （TC2020JC08）
Jiangsu Higher Education Institutions(PAPD) （PAPD）
