Liu Huidong, Xu Guoren, Li Guibai
School of Environment, Harbin Institute of Technology, Harbin 150090, China.
School of Environment, Harbin Institute of Technology, Harbin 150090, China; College of Resources and Environment, University of Chinese Academy of Sciences (UCAS), Beijing 100049, China.
J Colloid Interface Sci. 2021 Apr;587:271-278. doi: 10.1016/j.jcis.2020.12.014. Epub 2020 Dec 9.
In this study, two different kinds of pharmaceutical sludge activated by NaOH were used to prepare biochar. The characteristics of biochar prepared by impregnation method and dry mixing method were analyzed, including N adsorption-desorption isotherms, surface functional group analysis and micromorphological observation. The results showed that the biochar prepared by impregnation method had more micropores, while that prepared by dry mixing activation method had more mesopores. The adsorption reaction of tetracycline on the two different kind of biochar was investigated. Several important factors such as solution initial pH, tetracycline concentration and reaction time on adsorption reaction were investigated. The results show that both kinds of biochar have high tetracycline adsorption efficiency and excellent pH adaptability. The biochar manufactured by dry mixing activation method had better adsorption performance (379.78 mg/g, 25 °C). Regeneration experiments showed that the adsorbent had stable performance in absorbing tetracycline. Direct dry mixing activation method is a simple and effective method used to prepare porous biochar, which can be used for the resourceful utilization of pharmaceutical sludge. This work provides extensive information on the use of biochar derived from pharmaceutical sludge for the removal of TC from hospital and pharmaceutical production wastewater.
在本研究中，使用两种经氢氧化钠活化的不同种类的制药污泥制备生物炭。分析了通过浸渍法和干混法制备的生物炭的特性，包括氮吸附-脱附等温线、表面官能团分析和微观形态观察。结果表明，浸渍法制备的生物炭具有更多微孔，而干混活化法制备的生物炭具有更多中孔。研究了四环素在两种不同生物炭上的吸附反应。考察了溶液初始pH值、四环素浓度和反应时间等几个重要因素对吸附反应的影响。结果表明，两种生物炭都具有较高的四环素吸附效率和优异的pH适应性。干混活化法制备的生物炭具有更好的吸附性能（379.78 mg/g，25℃）。再生实验表明，该吸附剂在吸附四环素方面具有稳定的性能。直接干混活化法是一种用于制备多孔生物炭的简单有效方法，可用于制药污泥的资源化利用。这项工作为利用制药污泥衍生的生物炭去除医院和制药生产废水中的四环素提供了广泛信息。
