CAJ | 학술논문

以牛粪生物炭为吸附剂，研究了 pH、粒径、投加量、温度和共存阳离子等因素对牛粪生物炭吸附氨氮的影响及吸附特性.结果表明，共存阳离子 Na +、 Ca2+的存在对牛粪生物炭吸附氨氮有抑制作用，在 Na +、 Ca2+浓度相同条件下对氨氮吸附影响大小顺序为 Na +﹥ Ca2+；牛粪生物炭吸附氨氮的最佳初始 pH 值应在5~8范围；通过对动力学数据进行分析，发现准二级动力学方程(R2＝0.9673)比准一级动力学方程(R2＝0.7659)和 Elovich 方程(R2＝0.7249)能更好地拟合动力学数据，颗粒内扩散方程拟合结果发现牛粪生物炭对氨氮的吸附包括表面吸附和颗粒内扩散两个过程.吸附等温线拟合发现 Freundlich方程(R2＝0.9762)能很好地描述氨氮在牛粪生物炭上的吸附行为.吉布斯自由能变化(△Gθ)、焓变(△Hθ)和熵变(△Sθ)的计算结果表明，牛粪生物炭对氨氮的吸附是自发的吸热过程.
이우분생물탄위흡부제，연구료 pH、립경、투가량、온도화공존양리자등인소대우분생물탄흡부안담적영향급흡부특성.결과표명，공존양리자 Na +、 Ca2+적존재대우분생물탄흡부안담유억제작용，재 Na +、 Ca2+농도상동조건하대안담흡부영향대소순서위 Na +﹥ Ca2+；우분생물탄흡부안담적최가초시 pH 치응재5~8범위；통과대동역학수거진행분석，발현준이급동역학방정(R2＝0.9673)비준일급동역학방정(R2＝0.7659)화 Elovich 방정(R2＝0.7249)능경호지의합동역학수거，과립내확산방정의합결과발현우분생물탄대안담적흡부포괄표면흡부화과립내확산량개과정.흡부등온선의합발현 Freundlich방정(R2＝0.9762)능흔호지묘술안담재우분생물탄상적흡부행위.길포사자유능변화(△Gθ)、함변(△Hθ)화적변(△Sθ)적계산결과표명，우분생물탄대안담적흡부시자발적흡열과정.
The adsorption characteristics of ammonium from aqueous solution onto biochar derived from dairy manure were investigated as a function of parameters such as solution pH, particle size, adsorbent dosage, temperature and competitive cations. The results indicated that the effects of other cations on the adsorption of ammonium followed the order of preference Na + ﹥ Ca2 + at identical mass concentrations. It was observed that pH played an important role in the ammonium adsorption and the optimal pH values ranged between 5 and 8. The kinetic data fitted the pseudo-second-order model (R2 = 0. 967 3) but showed very poor fits for the pseudo-first-order model (R2 = 0. 765 9) and the Elovich model (R2 = 0. 724 9). The results from the Intra-particle model also showed that there were two separate stages in sorption process, which were external diffusion and the diffusion of inter-particle. Adsorption isotherms for dairy manure biochar were fitted the Freundlich model (R2 = 0. 976 2) more effectively than other models. Thermodynamics parameters such as free energy (△Gθ), enthalpy (△Hθ), and entropy (△Sθ) were also determined, which indicated that the adsorption was a spontaneous and endothermic process.