摘要
采用海藻酸钠对MAL粉末进行包埋制备水凝胶材料Hydrogel-Ⅰ,并将其应用于水中铅离子的去除。采用响应曲面法结合中心复合设计优化Hydrogel-Ⅰ的制备条件及其吸附Pb(Ⅱ)的操作条件。XPS揭示Hydrogel-Ⅰ携带的-OH、-COO-、-NH、-NH_(2)和-CSS等官能团与Pb(Ⅱ)产生吸附结合。在吸附过程中,离子交换、表面络合、静电吸引和孔填充均发挥作用。比较Hydrogel-Ⅰ凝胶颗粒和MAL粉末对Pb(Ⅱ)的吸附性能。虽然上述两种材料具有较为接近的吸附速率和最大吸附量(qm),但Hydrogel-Ⅰ表现出更好的重复利用性,同时,更容易从水溶液中分离出来。与其他有机水凝胶材料相比,Hydrogel-Ⅰ具有较快的吸附速度和较高的吸附容量。上述结果表明,Hydrogel-Ⅰ具备较好应用潜能,可用于Pb(Ⅱ)的吸附。
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, —NHand —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.
作者
郑春莉
王巧蕊
耿国庆
王振兴
卓恒
Chun-li ZHENG;Qiao-rui WANG;Guo-qing GENG;Zhen-xing WANG;Heng ZHUO(Department of Environmental Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education,Chang’an University,Xi’an 710049,China;Department of Civil and Environmental Engineering,National University of Singapore,117576,Singapore;South China Institute of Environmental Sciences,Ministry of Ecology and Environment(MEE),Guangzhou 510655,China;Jiangsu TST Professional Testing Co.,Ltd.,Suqian 223800,China)
基金
funded by the National Key Research and Development Project (No.2019YFC1804800)
Key R&D Program of Shaanxi Province,China (No.2019SF-253)
the Fundamental Research Funds for the Central Universities,China (No.300102291504)
the Pearl River S&T Nova Program of Guangzhou,China (No.201710010065)
the Science and Technology Program of Guangdong Forestry Administration,China (No.2020-KYXM-08)
the Key Laboratory of Resource Chemistry,Ministry of Education,China (No.KLRC_ME2102)。
