Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China.
Innovation Platform of Intelligent and Energy-Saving Textiles, School of Textile Science and Engineering, Tiangong University, Tianjin 300387, China; State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China.
J Hazard Mater. 2021 Jun 5;411:125029. doi: 10.1016/j.jhazmat.2020.125029. Epub 2021 Jan 9.
Hydrogels have extensively studied as adsorbents, raw materials for the preparation of adsorbent hydrogels have low strength, while high strength hydrogels have weak adsorption capacity. In this study, PVA hydrogel was crosslinked via trihydroxy melamine and epichlorohydrin, and β-cyclodextrin with strong adsorption capacity was added to remove the heavy metal ions. Results showed that the addition of trihydroxy melamine with 8%, the compressive strength of the hydrogel was increased by approximately 20%. The Langmuir isotherm model showed that the adsorption capacity of the hydrogel for Pb(II) and Ni(II) reached 505.9 mg/g and 286.7 mg/g, respectively, and the efficiency of removing the low-concentration heavy metal ions in water more than 99%. The hydrogel is low cost, and maintained highly removal efficiency under low pH. The removal efficiency of the hydrogel remained above 90% after five repeated adsorption-desorption experiments. The hydrogels have a potential to be used in wastewater treatment as adsorbents.
水凝胶作为吸附剂得到了广泛的研究，而用于制备吸附性水凝胶的原材料强度较低，而强度较高的水凝胶的吸附能力则较弱。在这项研究中，通过三聚氰胺三羟和环氧氯丙烷对 PVA 水凝胶进行交联，并添加吸附能力较强的β-环糊精来去除重金属离子。结果表明，添加 8%的三聚氰胺三羟，水凝胶的抗压强度约提高了 20%。Langmuir 等温模型表明，水凝胶对 Pb(II)和 Ni(II)的吸附容量分别达到 505.9 mg/g 和 286.7 mg/g，对水中低浓度重金属离子的去除效率超过 99%。该水凝胶成本低廉，在低 pH 值下仍能保持较高的去除效率。在五次重复吸附-解吸实验后，水凝胶的去除效率仍保持在 90%以上。水凝胶作为吸附剂有望应用于废水处理。
