CAJ | 학술논문

以农业废弃物玉米芯为原料，采用限氧热解法（600℃）制备生物碳，分别采用盐酸、双氧水和硝酸对其进行改性。通过元素分析、FTIR、BET-N2、Boehm滴定法及扫描电镜等手段表征了生物碳的组成与结构。通过序批实验，研究了生物碳对氨氮的吸附性能及影响因素，探讨了其吸附机理，为生物碳在污水处理中更好的应用提供参考。结果表明，未改性生物碳和经过盐酸、硝酸和双氧水改性的生物碳其比表面积分别为17.74、212.89、208.74和209.15 m2·g-1；表面酸性含氧官能团数量分别为0.11、0.95、5.73和2.15 mmol·g-1。等温吸附曲线符合Freundlich方程。动力学研究表明，生物碳对氨氮吸附行为符合准二级动力学方程。且经硝酸改性生物碳由于表面酸性含氧官能团的增加，其对氨氮的吸附能力显著提高。
이농업폐기물옥미심위원료，채용한양열해법（600℃）제비생물탄，분별채용염산、쌍양수화초산대기진행개성。통과원소분석、FTIR、BET-N2、Boehm적정법급소묘전경등수단표정료생물탄적조성여결구。통과서비실험，연구료생물탄대안담적흡부성능급영향인소，탐토료기흡부궤리，위생물탄재오수처리중경호적응용제공삼고。결과표명，미개성생물탄화경과염산、초산화쌍양수개성적생물탄기비표면적분별위17.74、212.89、208.74화209.15 m2·g-1；표면산성함양관능단수량분별위0.11、0.95、5.73화2.15 mmol·g-1。등온흡부곡선부합Freundlich방정。동역학연구표명，생물탄대안담흡부행위부합준이급동역학방정。차경초산개성생물탄유우표면산성함양관능단적증가，기대안담적흡부능력현저제고。
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.