文献类型： 外文期刊

作者： Wang, Siyuan ¹ ; Kwak, Jin-Hyeob ² ; Islam, Md Shahinoor ⁴ ; Naeth, M. Anne ² ; El-Din, Mohamed Gamal ⁴ ; Chang, Sc ¹ ;

作者机构： 1.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangzhou 510640, Peoples R China

2.Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2E3, Canada

3.Jeonbuk Natl Univ, Dept Rural Construct Engn, Jeonju 57896, Jeollabukdo, South Korea

4.Univ Alberta, Dept Civil & Environm Engn, Edmonton, AB T6G 1H9, Canada

5.Bangladesh Univ Engn & Technol, Dept Chem Engn, Dhaka 1000, Bangladesh

关键词： Biochar; Feedstock type; Toxic metals adsorption; Oil sands process water

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 712 卷

页码：

收录情况： SCI

摘要： Biochar is a promising material for efficient removal of toxic metals from wastewater to meet standards for discharge into surface water. We characterized adsorption behaviour of willow (Salix alba) wood (WW) and cattle manure (CM) and their biochars, willow wood biochar (WWB) and cattle manure biochar (CMB), and elucidated the mechanisms for the removal of Ni(II), Cu(II) and Cd(II) from aqueous solutions. The kinetic adsorption suggests that the adsorption of Ni(II), Cu(II) and Cd(II) by feedstock and their biochars was controlled by mass transport, and chemisorption also played a role in the adsorption process. The Elovich model also well described the adsorption kinetics for WW and CM (R-2 > 0.92), indicating that heterogeneous diffusion was the mechanism. The Sips isotherm model fitted best (R-2 > 0.98) for Ni(II), Cu(II) and Cd(II) adsorption by the feedstocks and their biochars, indicating that both monolayer and multilayer adsorption played roles on the heterogeneous surfaces of the four adsorbents. The WWB had a higher while the CMB had a lower adsorption capacity than their respective feedstock due to the presence of abundant -COOH functional group on WWB surface to interact with Ni(II), Cu(II) and Cd(II) to form surface complexes. The higher specific surface area and lower pH of point of zero charge (PZC) of WWB were other contributing factors for its greater removal capacity. Therefore, we conclude that proper feedstocks need to be selected to produce biochars that are efficient for the removal of toxic metals from wastewater. (C) 2020 Elsevier B.V. All rights reserved.