A green and economical MgO/biochar composite for the removal of U(VI) from aqueous solutions

被引：26

作者：

Chen, Weiwei ^{[1
]}

Feng, Jinghua ^{[1
]}

Liu, Shuya ^{[1
]}

Zhang, Jing ^{[1
]}

Cai, Yawen ^{[1
]}

Lv, Zhimin ^{[1
]}

Fang, Ming ^{[1
]}

Tan, Xiaoli ^{[1
]}

机构：

[1] North China Elect Power Univ, Coll Environm Sci & Engn, MOE Key Lab Resources & Environm Syst Optimizat, Beijing 102206, Peoples R China

来源：

CHEMICAL ENGINEERING RESEARCH & DESIGN | 2022年 / 180卷

关键词：

Adsorption; Magnesium oxide; Biochar; U(VI); Mechanism; MAGNESIUM-OXIDE; EFFICIENT REMOVAL; ORGANIC FRAMEWORKS; AMIDOXIME GROUPS; GRAPHENE OXIDE; METAL-IONS; ADSORPTION; URANIUM; SORPTION; BIOCHAR;

D O I：

10.1016/j.cherd.2022.02.031

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

A magnesium oxide/biochar (MgO/biochar) composite, which was green and economical compared with numerous materials, was synthesized by a facile method. And MgO/biochar performed excellent adsorption ability in the sequestration of U(VI) with the satisfied maximum adsorption capacity (514.72 mg g(-1)) at pH = 4.0, m/V = 0.2 g L-1, C-U(VI)initial = 10 mg L-1, I = 0.01 M NaNO3, T = 298 K. The morphology, spectroscopic properties, chemical composition, etc. of MgO/biochar were characterized systemically by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), Fourier transform infrared (FTIR). The batch experiments showed that the adsorption process was predominated by pseudo-second-order rate model and the adsorption isotherm conformed to the Langmuir model. The prepared MgO/biochar exhibited commendable U(VI) adsorption performance in a wide pH range. Xray photoelectron spectroscopy (XPS) analysis suggested that the interactions between U(VI) and the hydroxyl groups on the surface of the MgO/biochar contribute greatly to the efficient adsorption process. This work underlines new opportunities in combining the advantages of MgO and biochar, and further broadens new horizons of separating pollutants from the aquatic environment by an environment-friendly materials. (C) 2022 Institution of Chemical Engineers. Published by Elsevier Ltd. All rights reserved.

引用

页码：391 / 401

页数：11

共 64 条

[1] The Green Synthesis of MgO Nano-Flowers Using Rosmarinus officinalis L. (Rosemary) and the Antibacterial Activities against Xanthomonas oryzae pv. oryzae [J].