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Synthesis and Characterization of Novel Hybridized CeO2@SiO2 Nanoparticles Based on Rice Husk and Their Application in Antibiotic Removal
Langmuir ( IF 3.9 ) Pub Date : 2021-02-16 , DOI: 10.1021/acs.langmuir.0c03632
Tien-Duc Pham 1 , Thi-Mai-Anh Le 1 , Thi-My-Quynh Pham 1 , Viet-Huy Dang 2 , Khanh-Linh Vu 2 , Trung-Kien Tran 3 , Thu-Ha Hoang 2
Affiliation  

This work aims to synthesize a core–shell material of CeO2@SiO2 based on rice husk as a novel hybridized adsorbent for antibiotic removal. The phase structures of CeO2@SiO2 and CeO2 nanoparticles that were fabricated by a simple procedure were examined by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and Fourier transform infrared (FT-IR) spectroscopy, while their interfacial characterizations were performed by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), the Brunauer–Emmett–Teller (BET) method, and ζ-potential measurements. The removal efficiency of the antibiotic amoxicillin (AMX) using CeO2@SiO2 nanoparticles was much greater than that using SiO2 and CeO2 materials in solutions of different pH values. The optimum conditions for AMX removal using CeO2@SiO2 including contact time and adsorbent dosage were 120 min and 5 mg/mL, respectively. The maximum AMX removal using CeO2@SiO2 reached 100% and the adsorption capacity was 12.5 mg/g. Adsorption isotherms of AMX onto CeO2@SiO2 were fitted by Langmuir, Freundlich, and two-step adsorption models, while the adsorption kinetics of AMX achieved a better fit by the pseudo-second-order model than the pseudo-first-order model. The electrostatic and nonelectrostatic interactions between the zwitterionic form of AMX and the positively charged CeO2@SiO2 surface were controlled by adsorption. The effects of different organics such as humic acid, ionic surfactants, and pharmaceutical substances on AMX removal using CeO2@SiO2 were also thoroughly investigated. The high AMX removal efficiencies of about 75% after four regenerations and about 70% from an actual water sample demonstrate that CeO2@SiO2-based rice husk is a hybrid nanomaterial for antibiotic removal from water environments.

中文翻译:

基于稻壳的新型杂化CeO 2 @SiO 2纳米粒子的合成,表征及其在抗生素去除中的应用

这项工作旨在合成基于稻壳的CeO 2 @SiO 2核壳材料,作为一种新型的去除抗生素的杂交吸附剂。通过X射线衍射(XRD),能量色散X射线光谱(EDS)和傅立叶变换红外(FT-IR)检查了通过简单程序制备的CeO 2 @SiO 2和CeO 2纳米粒子的相结构)光谱,而它们的界面特征则通过扫描电子显微镜(SEM),高分辨率透射电子显微镜(HRTEM),Brunauer-Emmett-Teller(BET)方法和ζ电位测量进行。CeO 2 @SiO 2对抗生素阿莫西林(AMX)的去除效率在不同pH值的溶液中,纳米颗粒比使用SiO 2和CeO 2材料的纳米颗粒大得多。使用CeO 2 @SiO 2去除AMX的最佳条件包括接触时间和吸附剂量分别为120分钟和5 mg / mL。使用CeO 2 @SiO 2的最大AMX去除率达到100%,吸附容量为12.5 mg / g。AMX在CeO 2 @SiO 2上的吸附等温线分别用Langmuir,Freundlich和两步吸附模型拟合,而AMX的吸附动力学比拟一阶模型更适合拟二阶模型。两性离子形式的AMX与带正电的CeO 2 @SiO 2表面之间的静电和非静电相互作用通过吸附来控制。还彻底研究了腐殖酸,离子表面活性剂和药物等不同有机物对使用CeO 2 @SiO 2去除AMX的影响。四次再生后大约75%的高AMX去除效率和实际水样中大约70%的高去除率表明CeO 2 @SiO 2基稻壳是一种用于从水环境中去除抗生素的杂化纳米材料。
更新日期:2021-03-09
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