Abstract：
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 (R2 = 0.9642) with the surface area of the biochars, among which biochar K50%W29%C-700 (pyrolysis at 700 °C in the presence of 50 % KOH and 29 % water) possessed the largest surface area (1378 m2/g) and exhibited the highest adsorption capacity (769 mg/g) compared to its homologous products. Biochar K50%W29%C-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.
摘要：
在不同的处理条件下，通过一步氢氧化钾（KOH）活化将农业废物（Goji分支）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，然后以亚甲基蓝作为模型污染物对其吸附性能进行了评估。应用不同的吸附模型来拟合吸附过程并揭示可能的机理。发现吸附容量与生物炭的表面积密切相关（R2=0.9642），其中生物炭K50％W29％C-700（在50％KOH和29％水存在下在700°C下热解）具有最大的表面积（1378m2/g），并表现出最高的吸附能力（769mg/g）与其同源产品相比。生物炭K50％W29％C-700还显示出优异的可回收性和对其他常见有机污染物的有效吸附能力。结果表明，农业废物中的痕量水可以显着增强KOH参与的生产多孔生物炭的活化效率。
