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·g-1.The properties of KOH-CC were characterized by BET, SEM, XRD and FTIR.The machanism of ammonia-nitrogen adsorption was discussed.国家重点基础研究发展计划项目(2013CB733505)~
