Wang Xiong-Lei, Shen Jun, Niu Yan-Xia, Wang Yu-Gao, Liu Gang, Sheng Qing-Tao
a College of Chemistry and Chemical Engineering , Taiyuan University of Technology , Shanxi , People's Republic of China.
Environ Technol. 2018 Mar;39(6):694-701. doi: 10.1080/09593330.2017.1310304. Epub 2017 Apr 10.
Coal gasification tar residue (CGTR) is a kind of environmentally hazardous byproduct generated in fixed-bed coal gasification process. The CGTR extracted by ethyl acetate was used to prepare powdered activated carbon (PAC), which is applied later for adsorption of phenol. The results showed that the PAC prepared under optimum conditions had enormous mesoporous structure, and the iodine number reached 2030.11 mg/g, with a specific surface area of 1981 m/g and a total pore volume of 0.92 ml/g. Especially, without loading other substances, the PAC, having a strong magnetism, can be easily separated after it adsorbs phenol. The adsorption of phenol by PAC was studied as functions of contact time, temperature, PAC dosage, solution concentration and pH. The results showed a fast adsorption speed and a high adsorption capacity of PAC. The adsorption process was exothermic and conformed to the Freundlich models. The adsorption kinetics fitted better to the pseudo-second-order model. These results show that CGTR can be used as a potential adsorbent of phenols in wastewater.
煤气化焦油残渣（CGTR）是固定床煤气化过程中产生的一种对环境有害的副产品。用乙酸乙酯萃取的CGTR用于制备粉末活性炭（PAC），随后将其应用于苯酚的吸附。结果表明，在最佳条件下制备的PAC具有巨大的中孔结构，碘值达到2030.11 mg/g，比表面积为1981 m/g，总孔体积为0.92 ml/g。特别是，在不负载其他物质的情况下，具有强磁性的PAC在吸附苯酚后可以很容易地分离出来。研究了PAC对苯酚的吸附与接触时间、温度、PAC用量、溶液浓度和pH值的关系。结果表明，PAC具有快速的吸附速度和较高的吸附容量。吸附过程是放热的，符合Freundlich模型。吸附动力学更符合准二级模型。这些结果表明，CGTR可作为废水中酚类物质的潜在吸附剂。
