Guan Jian, Zhu Mingxin, Zhou Jun, Luo Liwen, Fernando Romanholo Ferreira Luiz, Zhang Xueying, Liu Jiayang
College of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China.
Bioresour Technol. 2023 Dec;389:129793. doi: 10.1016/j.biortech.2023.129793. Epub 2023 Sep 27.
The agricultural waste (Goji branch) was pyrolyzed into biochars with one-step potassium hydroxide (KOH) activation under different processing conditions. The biochars were first characterized in structural features and functional groups and then evaluated for adsorptive performance with methylene blue as a model pollutant. Different adsorption models were applied to fit the adsorption process and reveal the possible mechanisms. The adsorption capacity was found to strongly correlate (R = 0.9642) with the surface area of the biochars, among which biochar KWC-700 (pyrolysis at 700 °C in the presence of 50 % KOH and 29 % water) possessed the largest surface area (1378 m/g) and exhibited the highest adsorption capacity (769 mg/g) compared to its homologous products. Biochar KWC-700 also showed excellent recyclability and potent adsorption capacity toward other common organic pollutants. The results suggest that traces of water in agricultural wastes could significantly intensify the KOH-involved activation efficiency of producing porous biochar.
在不同处理条件下，采用一步法氢氧化钾（KOH）活化将农业废弃物（枸杞枝条）热解为生物炭。首先对生物炭的结构特征和官能团进行了表征，然后以亚甲基蓝为模型污染物评估了其吸附性能。应用不同的吸附模型拟合吸附过程并揭示可能的机制。发现吸附容量与生物炭的表面积密切相关（R = 0.9642），其中生物炭KWC - 700（在50% KOH和29%水存在下于700℃热解）具有最大的表面积（1378 m²/g），与其同类产品相比表现出最高的吸附容量（769 mg/g）。生物炭KWC - 700还显示出优异的可回收性以及对其他常见有机污染物的强大吸附能力。结果表明，农业废弃物中的微量水分可显著提高KOH参与的制备多孔生物炭的活化效率。
