文献类型：期刊文献

英文题名：Synthesis of controlled release calcium peroxide nanoparticles (CR-nCPs): Characterizations, H2O2 liberate performances and pollutant degradation efficiency

作者：Ali, Meesam[1,2];Farooq, Usman[3];Lyu, Shuguang[1];Sun, Yong[1];Li, Ming[1];Ahmad, Ayyaz[2];Shan, Ali[1,4];Abbas, Zain[1]

机构：[1]East China Univ Sci & Technol, State Environm Protect Key Lab Environm Risk Asse, Shanghai 200237, Peoples R China;[2]Muhammad Nawaz Sharif Univ Engn & Technol, Dept Chem Engn, Multan 60000, Pakistan;[3]Henan Univ, Coll Chem & Chem Engn, Kaifeng 475000, Peoples R China;[4]Univ Lahore, Dept Environm Sci, Lahore 46000, Pakistan

年份：2020

卷号：241

外文期刊名：SEPARATION AND PURIFICATION TECHNOLOGY

收录：;EI(收录号：20200908216624);WOS:【SCI-EXPANDED(收录号:WOS:000527318800074)】；

基金：This study was financially supported by a grant from the International Academic Cooperation and Exchange Program of Shanghai Science and Technology Committee (NO. 18230722700).

语种：英文

外文关键词：Controlled release nCaO(2); Surface stabilizers; H2O2 release; TCE degradation; Groundwater remediation

摘要：Various controlled release calcium peroxide nanoparticles (CR-nCPs) were synthesized and their characteristics and effectiveness in trichloroethylene (TCE) degradation were assessed. In this concern, calcium peroxide nanoparticles (nCPs) were initially prepared with four different surface stabilizers (PEG 200, PVP, PVA and DEGMME) to inhibit the irreversible agglomeration of nCPs by chemical precipitation method, then CR-nCPs were further synthesized by the coating of the selected polymers on nCPs. The characterizations of nCPs and CR-nCPs were performed using XRD, FESEM, TEM, FTIR, BET and TGA techniques. The results displayed the prepared nCPs in nano size with good dispersion, reliable purity, and standard surface area. The characterizations of CR-nCPs confirmed the success of polymer coating on nCPs. The H2O2 release profiles of the prepared CR-nCPs were determined by UV spectrophotometer. PVA@nCP-PVA has shown the maximum H2O2 controlled release efficiency (CRE) of 50.2%. The prepared CR-nCPs were tested for TCE degradation at optimum conditions of Fe (II) = 1.1 mM and CR-nCPs = 50 mg/L. The maximum removal percentages of 99.7% after 120 min and 66% after 180 min were achieved by CR-nCPs having moderate CRE (16.0-20.3%) and high CRE (50.2%) respectively. It was found that the CRE of CR-nCPs and their TCE degradation efficiencies have an inverse relationship. The CR-nCPs with moderate CRE were further employed for investigating the effect of polymer coating with increased polymer quantity (1:40). With the increase in polymer coating quantities, TCE removal percentages of 98.17%, 82.02% and 79.29% were obtained by PEG 400@nCP-DEGMME, DEGMME@nCP-DEGMME and PEG 400@nCP-PEG 200 after 360 min, respectively. In conclusion, this work suggests that CR-nCPs with moderate and high CRE are advantageous, in long term effectiveness, to potentially degrade TCE in groundwater remediation practice.