摘要
在不同煅烧温度下制备侧柏叶生物炭,研究其对刚果红(CR)溶液的吸附性能.采用扫描电子显微镜、傅里叶变换红外光谱仪、比表面积和孔径分析仪、X射线衍射仪对生物炭进行表征,探讨了pH值、生物炭用量、吸附时间、振荡转速、温度及CR初始浓度等因素对CR溶液吸附性能的影响.结果表明:在pH=6、生物炭用量为0.06g、吸附时间为30 min、振荡转速为150 r-min-1、温度为25 ℃、CR初始浓度为200 mg·L-1时,800 ℃煅烧下的侧柏叶生物炭对CR溶液吸附效果最佳,其吸附率可达99.5％、吸附量可达165.9 mg·g-1.吸附等温符合Langmuir模型,动力学符合准一级模型,该吸附过程是自发的吸热过程.
Abstract
On one hand,the preparation of biochar from Platycladus orientalis leaves at different pyrolysis temperatures and its adsorption performance on Congo Red(CR)solution were investigated.On the other hand,the biochar was characterized by using scanning electron microscopy,Fourier-transform infrared spectroscopy,specific surface area and pore size analyzer,and X-ray diffraction.In the meanwhile,the effects of pH value,biochar dosage,adsorption time,oscillation speed,temperature,and initial CR con-centration on the adsorption performance in CR solution were explored.Generally speaking,the results are shown as follows.Firstly,under the conditions of pH=6,a biochar dosage of 0.06 g,an adsorption time of 30 min,an oscillation speed of 150 r·min-1,a temperature of 25 ℃,and an initial CR concen-tration of 200 mg·L-1,biochar derived from Platycladus orientalis leaves at 800 ℃ exhibits optimal ad-sorption performance.Secondly,the adsorption rate can reach 99.5％,and the adsorption capacity is 165.9 mg·g-1.Lastly,the adsorption isotherm conforms to the Langmuir model,and the kinetics follows the pseudo-first-order model.What's more,the adsorption process is a spontaneous endothermic process.
维普
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