Zaib Qammer, Ryenchindorj Urjinlkham, Putra Agusta Samodra, Kyung Daeseung, Park Hung-Suck
School of Civil and Environmental Engineering, University of Ulsan, Daehak-ro 93, Nam-gu, Ulsan, 44610, Republic of Korea.
Department of Chemical Engineering, Ulsan College, Daehak-ro 57, Nam-gu, Ulsan, 44610, Republic of Korea.
Environ Sci Pollut Res Int. 2023 Jan;30(2):4972-4985. doi: 10.1007/s11356-022-22476-0. Epub 2022 Aug 17.
We synthesized iron-coated pine-bark biochar (Fe-PBB) and determined the optimal conditions for removing the antibiotic tetracycline from water. The Fe-PBB was synthesized by depositing iron oxide on pyrolyzed pine-bark waste via a facile co-precipitation method. Characterization (SEM, EDX, and TGA) showed successful deposition of a mass of approximately 27% (w/w) iron on the PBB to synthesize Fe-PBB. Fe-PBB exhibited five times higher adsorption capacity (~ 10 mg/g) for tetracycline compared with PBB. The effects of initial tetracycline concentration, pH, temperature, and Fe-PBB dose on the adsorption removal of tetracycline from water were systematically investigated and optimized using a statistical experimental design and response surface methodology. The empirical relationship between the experimental factors and tetracycline removal was modeled, statistically validated through the analysis of variance, and used to predict the optimal conditions for adsorption removal of tetracycline. We found that ≥ 95% of the tetracycline can be removed at a tetracycline concentration of 1 mg/L, pH of 7, temperature of 50 °C, and a Fe-PBB dose of 2 g/L. The adsorption isotherm modeling study suggests that the adsorption of tetracycline can be attributed to the pore filling phenomenon and multilayer adsorption on the Fe-PBB. A thermodynamics study showed that the adsorption occurs spontaneously with an endothermic reaction.
我们合成了铁包覆松树皮生物炭（Fe-PBB），并确定了从水中去除抗生素四环素的最佳条件。Fe-PBB是通过一种简便的共沉淀法将氧化铁沉积在热解松树皮废料上合成的。表征（扫描电子显微镜、能谱仪和热重分析仪）表明，约27%（w/w）的铁成功沉积在松树皮生物炭上以合成Fe-PBB。与松树皮生物炭相比，Fe-PBB对四环素的吸附容量高五倍（约10 mg/g）。采用统计实验设计和响应面方法，系统研究并优化了初始四环素浓度、pH值、温度和Fe-PBB剂量对水中四环素吸附去除的影响。建立了实验因素与四环素去除率之间的经验关系模型，通过方差分析进行了统计验证，并用于预测四环素吸附去除的最佳条件。我们发现，在四环素浓度为1 mg/L、pH值为7、温度为50℃和Fe-PBB剂量为2 g/L时，≥95%的四环素可被去除。吸附等温线模型研究表明，四环素的吸附可归因于孔隙填充现象和在Fe-PBB上的多层吸附。热力学研究表明，吸附是一个自发的吸热反应。
