摘要
以生物产甲烷的副产物沼渣为原料，用5种不同的方法通过化学活化法制备生物炭，实验结果表明5种生物炭对沼液中的氨氮都有吸附效果，而氢氧化钾活化制备的生物炭（KOH-CC）对氨氮的吸附效果相对较好，吸附剂对氨氮的吸附符合准二级吸附动力学，吸附等温线表现为 Langmuir 型，通过拟合计算最大吸附容量能达到120 mg·g^-1。对生物炭进行BET、扫描电镜及红外等表征，分析了KOH-CC生物炭吸附氨氮过程的作用机理。
Five types of biochars were prepared through chemical activation utilizing fermentation residue from biogas plants. NaOH, KOH, H2SO4,H3PO4 and ZnCl2 were used as chemical activating agents. Biochars could absorb ammonia-nitrogen in biogas slurry. Biochar derived from KOH treatment （KOH-CC） showed better adsorption efficiency than the others. The adsorption process followed pseudo-second-order kinetics, and the adsorption isotherm could be fitted to Langmuir equation. Simulation test indicated that the maximum adsorption capacity could reach 120 mg＆#183;g-1. The properties of KOH-CC were characterized by BET, SEM, XRD and FTIR. The machanism of ammonia-nitrogen adsorption was discussed.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2014年第5期1856-1861,共6页
Journal of Chemical Industry and Engineering（China）
基金
基金项目：国家重点基础研究发展计划项目f2013CB733505）.
关键词
甲烷
沼渣
生物炭
吸附
氨氮
吸附剂
methane
biogas residue
biochar
adsorption
ammonia-nitrogen
sorbent
