State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, No. 130, Meilong Road, Shanghai, 200237, China.
Institute of clean coal technology, East China University of Science and Technology, No. 130, Meilong Road, Shanghai, 200237, China.
J Hazard Mater. 2020 Jan 15;382:121040. doi: 10.1016/j.jhazmat.2019.121040. Epub 2019 Aug 19.
Dyes and heavy-metal ions are common pollutants in printing and dyeing wastewater, and are thus attracting considerable attention. Herein, an eco-friendly straw-based adsorbent, WS-CA-AM, was prepared by grafting with acrylamide (AM) and citric acid (CA) groups to remove representative dyes and heavy metals from aqueous solution. The adsorption capacities of WS-CA-AM for methyl orange (MO) and methylene blue (MB) were 3053.48 and 120.84 mg/g, which were 54 and 3 times those of unmodified straw, respectively. Moreover, the adsorption capacities for MB, MO, CrO and Cu in the mixed system increased by 210%, 133%, 196% and 151%, respectively, compared with those in the single system. The significant increase in adsorption capacity can be attributed to the collaborative effect through electrostatic attraction. The functional groups and adsorbed pollutants all served as adsorption sites for pollutants. These results indicate that WS-CA-AM is a potential applicant for the removal of dyes and heavy-metal ions from mixed aqueous solution.
染料和重金属离子是印染废水中常见的污染物，因此引起了相当大的关注。在此，通过接枝丙烯酰胺（AM）和柠檬酸（CA）基团，制备了一种环保的稻草基吸附剂 WS-CA-AM，用于从水溶液中去除代表性的染料和重金属。WS-CA-AM 对甲基橙（MO）和亚甲基蓝（MB）的吸附容量分别为 3053.48 和 120.84mg/g，分别是未改性稻草的 54 和 3 倍。此外，与单一体系相比，混合体系中 MB、MO、CrO 和 Cu 的吸附容量分别增加了 210%、133%、196%和 151%。吸附容量的显著增加可归因于静电吸引的协同作用。功能基团和吸附的污染物都充当了吸附剂的吸附位点。这些结果表明，WS-CA-AM 是一种从混合水溶液中去除染料和重金属离子的潜在应用材料。
