Abstract: Using Hebi semi-coke from underground coal gasification as the adsorbent, the removal experiment of phenol from simulated wastewater was conducted. The surface morphology, porous characteristics and functional groups of the semi-coke were characterized by applying scanning electron microscope(SEM), automatic specific surface and porosity analyzer and Fourier transform infrared spectroscopy(FT-IR). Furthermore, the effects of adsorbent mass, contact time and experimental temperature on phenol removal were also investigated. The results showed that micropore with pore width less than 2nm and layer structure with pore size distribution in 1—5nm of semi-coke were observed and surface oxygen enriched functionalities were also found in semi-coke. The highest phenol removal rate of 65% and adsorption capacity of 0.66mg/g could be obtained under conditions of temperature at 40℃ for 2h, with phenol concentration of 100mg/L and mass ratio of simulated wastewater to adsorbent of 10:1. The porous characteristic as well as surface oxygen enriched functional groups play a positive role in phenol's physical polymolecular layer adsorption, the Freundlich Equation can be calculated as Q=0.0546C^0.6286.

Key words: semi-coke of bituminous coal gasification, phenol, removal rate, adsorption isotherm

摘要： 以鹤壁烟煤地下气化半焦为脱除剂,对苯酚模拟废水进行脱除实验研究。采用扫描电镜、低温氮气物理脱除仪和红外光谱仪对半焦的表面特性、孔结构和表面官能团进行表征,进一步考察了半焦投加量、震荡时间、实验温度对模拟废水苯酚脱除的影响。实验结果表明:气化半焦具有微孔(小于2nm)和层状结构,微孔孔径主要分布在1~5nm之间,表面有较丰富的含氧官能团;在模拟废水苯酚浓度为100mg/L、水焦比为10:1、震荡时间为2h、脱除温度为40℃时,半焦对苯酚的脱除率和吸附容量分别为65%和0.66mg/g,气化半焦的孔结构特性和表面含氧官能团对苯酚脱除有积极作用;半焦对模拟废水中苯酚的吸附为多分子层物理吸附,其Freundlich吸附等温式为Q=0.0546C^0.6286。

关键词: 烟煤气化半焦, 苯酚, 脱除率, 吸附等温式