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Material Sciences 2022
改性银杏枝生物炭的制备及吸附性能研究
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Abstract:
生物炭广泛地应用于有机染料、重金属等物质的吸附过程。为了资源化利用修剪后的废弃银杏枝条，本文以银杏枝作为原材料制备生物炭，采用单因素法探究炭化阶段对生物炭产率的影响，采用正交法研究不同的改性剂、浸渍时间、温度、料液比对生物炭吸附性能的影响。同样以正交法考察了生物炭的投加量、吸附溶液浓度、吸附温度、吸附时间对亚甲基蓝染料的吸附影响。实验结果表明，生物炭最佳制备条件为：炭化温度为400℃，炭化2 h，0.2 mol/L硫酸镁溶液改性、料液比为1:5，温度为40℃，浸渍60 min。当生物炭投加量为1.25 g/L，亚甲基蓝溶液浓度为40 mg/L，温度为40℃，吸附90 min，生物炭对亚甲基蓝的吸附量可达31.5 mg/g。生物炭与亚甲基蓝的吸附过程和氢键与π-π作用有关。
Biochar is widely used in the adsorption process of organic dyes, heavy metals and other pollutants. In order to realize utilization of waste ginkgo branches, the main purpose of this paper is to prepare biochar from ginkgo branches as raw material. The optimization of operating variables during carbonization process was carried out by a single factor experiment. And the modified conditions including different modifiers, impregnation time, and impregnation temperature and impregnation ratio were further optimized by the orthogonal method towards adsorption performance of biochar. Similarly, the effects of biochar dosage, solution of concentration, adsorption temperature and time on the adsorption capacity of methylene blue were also investigated by orthogonal method. The results revealed that the optimal conditions were determined as: carbonization temperature of 400？C, activation time of 2 hours, 0.2 mol/L of modified magnesium sulfate solution, impregnation ratio of 1:5, impregnation temperature of 40？C and impregnation time of 60 min. Under the 1.25 g/L of biochar addition, 40 mg/L of methylene blue solution, adsorption temperature of 40？C, and adsorption time of 90 min, the biochar exhibited an adsorption capacity of 31.5 mg/g on methylene blue. The adsorption process between biochar and methylene blue was related to hydrogen bonds and π-π interaction.
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