A novel thiol-functionalized covalent organic framework (COF-S-SH) was prepared as an adsorbent for the simultaneous removal of BTEX (benzene, toluene, ethyl benzene and xylenes) and Hg(II) ion from water. The COF-S-SH was obtained via a Schiff-base reaction between a new triamino-monomer (TABPB) and 2,5-divinylterephthalaldehyde, followed by the thiol-ene “click” reaction between 1,2-ethanedithiol and the vinyl groups. The COF-S-SH was characterized by FT-IR spectrum, energy-dispersive X-ray spectrum, ¹³C MAS NMR spectrum, nitrogen adsorption–desorption isotherms, thermo-gravimetric analysis, scanning electron microscope, X-ray diffraction, and zeta potential. The new adsorbent showed high binding ability with the maximum adsorption capacities (Q_max) of 150.2–255.8 mg/g for BTEX and 588.2 mg/g for Hg(II). The adsorbent also presented fast adsorption kinetics with rate constants of 0.01043–0.05002 g/mg/min for BTEX and 7.254 × 10⁻⁴ g/mg/min for Hg(II). Moreover, the adsorbent had good binding selectivity for Hg(II) against common metal ions in water. The adsorbent also showed good simultaneous uptake ability and good reusability for BTEX and Hg(II), and it has been applied to simultaneously removing BTEX and Hg(II) in the simulated sewage with the removal efficiencies of 63.6, 82.1, 94.6, 95.3 and 94.1% for benzene, toluene, ethyl benzene, m-xylene and Hg(II), respectively. Especially, it can reduce the low-concentration Hg(II) in the simulated sewage to a level lower than the drinking water limit. Therefore, COF-S-SH can be used as an excellent adsorbent material for simultaneously removing BTEX and Hg(II) in from the produced water and wastewater in petroleum chemistry industries.

制备了一种新型的硫醇官能化共价有机骨架（COF-S-SH）作为吸附剂，用于从水中同时去除BTEX（苯，甲苯，乙苯和二甲苯）和Hg（II）离子。COF-S-SH是通过新的三氨基单体（TABPB）与2,5-二乙烯基对苯二甲醛之间的席夫碱反应，然后通过1,2-乙二硫醇与乙烯基之间的硫醇-烯“点击”反应获得的。COF-S-SH的特征在于FT-IR光谱，能量色散X射线光谱，¹³ C MAS NMR光谱，氮吸附-解吸等温线，热重分析，扫描电子显微镜，X射线衍射和ζ潜在。新的吸附剂显示出高吸附能力，最大吸附能力（Q _max）对于BTEX为150.2–255.8 mg / g，对于汞（II）为588.2 mg / g。吸附剂还表现出快速的吸附动力学，对于BTEX的速率常数为0.01043–0.05002 g / mg / min，而吸附常数为7.254×10 ^-4汞（II）为g / mg / min。此外，该吸附剂对Hg（II）对水中常见金属离子具有良好的结合选择性。该吸附剂还对BTEX和Hg（II）表现出良好的同时吸收能力和良好的可重复使用性，已被用于同时去除模拟污水中的BTEX和Hg（II），去除效率为63.6、82.1、94.6、95.3和苯，甲苯，乙苯，间二甲苯和Hg（II）分别占94.1％。特别是，它可以将模拟污水中的低浓度Hg（II）降低到低于饮用水极限的水平。因此，COF-S-SH可以用作从石油化学工业生产的水和废水中同时去除BTEX和Hg（II）的优良吸附材料。