化工学报Issue(3)：960-966,7.DOI:10.3969/j.issn.0438-1157.2014.03.028
改性玉米芯生物碳对氨氮的吸附特性
Adsorption characters of ammonium-nitrogen in aqueous solution by modified corn cob biochars
摘要
Abstract
Biochars produced by pyrolysis of corn cob(600℃) which is agricultural waste, and modified with hydrochloric acid, hydrogen peroxide and nitric acid separately. Elemental analysis, BET-N2 surface area (SA), scanning electron microscopy, Boehm titration and FTIR spectra were used to characterized their physicochemical properties. Batch experiments were conducted to investigate ammonium adsorption process of corn cob biochars. The results revealed that acid modification can significantly improve biochars’ specific surface area, which were 17.74, 212.89, 208.74 and 209.15 m2·g-1 for without modified and modified with HCl, HNO3 and H2O2 samples, respectively;while the amounts of acidic functional groups were 0.11, 0.95, 5.73 and 2.15 mmol·g-1, respectively. The results for fitting experimental data of adsorption process with isotherm models showed that it is better for Freundlich isotherm model than Langmuir isotherm model. Moreover, the adsorption process can be well described by pseudo-second-order kinetic model. The results obtained demonstrated that biochars modified with nitric acid have the highest adsorption capacity because of more acidic functional groups.关键词
生物碳/氨氮/吸附/动力学/等温模型Key words
biochar/ammonium/adsorption/kinetics/isotherm model分类
资源环境引用本文复制引用
张扬,李子富,张琳,赵瑞雪..改性玉米芯生物碳对氨氮的吸附特性[J].化工学报,2014,(3):960-966,7.基金项目
中央高校基本科研业务费专项资金（FRF-IC-11-001）。@@@@ supported by the Fundamental Research Funds for the Central Universities of China (FRF-IC-11-001) （FRF-IC-11-001）
