Abstract:

Typical organic pollutants in organic chemical wastewater such as aniline and phenol are highly toxic, easily bio-enriched, and difficult to biodegrade, which not only adversely affect human health, but also cause serious environmental pollution. Therefore, it is urgent to efficiently remove organic pollutants from water. Hypercrosslinked resins have high adsorption capacity and excellent adsorption selectivity. Therefore, it is of great significance to develop functionalized hypercrosslinked resins with high specific surface area and plentiful functional groups. Herein, chloromethylated polystyrene was used as the precursor, 3,5-dimethylphenol was applied as the functional monomer, and formaldehyde dimethyl acetal was employed as the external crosslinking agent, the oxygen-rich functionalized hypercrosslinked resin was synthesized according to the nucleophilic substitution and Friedel-Crafts reaction. The resulting resin, namely, PS-KPM-HCLR has a relative high specific surface area (198 m²/g) and plentiful oxygen content (8.67%(mass)) with abundant micropores (micropores area in relation to the total surface area accounts for 36.3%), and it has an enhanced adsorption of anline with the equilibrium capacity of 156.4 mg/g at 300 K. The resin has an excellent adsorption efficiency at a low concentration of aniline (66.5 mg/L), which meets the first grade national discharges standard (<1.0 mg/L) with excellent recycling performance.

Key words: oxygen-rich, hypercrosslinked resin, aniline, adsorption, desorption, recover

摘要：

有机化工废水中典型的有机污染物，如苯胺、苯酚等，具有高毒性、易生物富集、难生物降解等特质，不仅对人体健康造成不利影响，还会引起严重的环境污染。因此，从水中高效地去除有机污染物迫在眉睫。超交联树脂对有机污染物具有较高的吸附容量及优异的吸附选择性，开发具有高表面积和丰富官能团的功能化超交联树脂有一定的学术价值和广阔的应用前景。本文以氯甲基化聚苯乙烯为前体，3,5-二甲基苯酚为功能单体，甲缩醛为外加交联剂，通过亲核取代反应和Friedel-Crafts烷基化反应，合成了富氧功能化超交联树脂。结果表明，富氧功能化超交联树脂拥有较高的氧含量[8.67%(质量)]、较大的比表面积（198 m²/g）和丰富的微孔（微孔面积占总比表面积的36.3%），300 K下对苯胺的平衡吸附量达156.4 mg/g。树脂对低浓度的苯胺有优秀的吸附效率，达到国家一级排放标准（<1.0 mg/L），且具有优良的循环使用性能。

关键词: 富氧, 超交联树脂, 苯胺, 吸附, 脱附, 回收