中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 8 August 2022 |
（1. Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, China;
2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang’an University, Xi’an 710049, China;
3. Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore;
4. South China Institute of Environmental Sciences, Ministry of Ecology and Environment (MEE), Guangzhou 510655, China;
5. Jiangsu TST Professional Testing Co., Ltd., Suqian 223800, China）
Abstract:Hydrogel-I was fabricated via sodium alginate in situ-embedding with MAL powders and then applied to decontaminating Pb(II) from water. Conditions for preparing Hydrogel-I and the adsorption of Pb(II) over Hydrogel-I were optimized through response surface methodology coupled with central composite design. XPS revealed that the groups of —OH, —COO—, —NH, —NH2 and —CSS— carried by Hydrogel-I were responsible for the uptake of Pb(II). Ions exchange, surface complexation, electrostatic attraction and pore-filling effect contributed to the adsorption process. Adsorption performances of Pb(II) by Hydrogel-I and MAL powders were compared. Although they exhibited similar adsorption rate and maximum adsorption capacity (qm), the reusing ability of Hydrogel-I was better and it was easier to be separated from aqueous solution after treatment. Even compared with organic hydrogel materials, Hydrogel-I presented relatively quick adsorption speed and high adsorption capacity. It can be concluded that Hydrogel-I could be an alternative scavenger for the treatment of Pb(II) from aqueous solution.
Key words: adsorption; MAL powder; hydrogel bead; Pb(II)
