污泥酸提液/Fe^(2+)改性活性炭纤维对氨氮的吸附  

Activated Carbon Fiber Modified with Sludge Acid Extract and Fe^(2+)for Ammonia Nitrogen Adsorption

作　　者：张彦平 范旭腾 李一兵 李芬[3] ZHANG Yan‑ping;FAN Xu‑teng;LI Yi‑bing;LI Fen(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China;Medical Engineering Design Institute,The Fourth Construction Co.Ltd.of China Electronics System Engineering,Shijiazhuang 050011,China;College of Chemical and Environmental Engineering,Harbin University of Science&Technology,Harbin 150040,China)

机构地区：[1]河北工业大学土木与交通学院,天津300401 [2]中国电子系统工程第四建设有限公司医药工程设计院,河北石家庄050011 [3]哈尔滨理工大学化学与环境工程学院,黑龙江哈尔滨150040

出　　处：《中国给水排水》2024年第1期82-89,共8页China Water & Wastewater

基　　金：国家自然科学基金资助项目(22278100)。

摘　　要：以活性炭纤维(ACF)为载体,以给水厂污泥酸提液(Sae)与氯化亚铁混合溶液为改性溶液,制备氨氮吸附材料Fe/Al-ACF。实验结果表明:Fe/Al-ACF在水中稳定性良好,在中性和碱性条件下对氨氮具有较好的去除效果。当温度为25℃、氨氮为20 mg/L、Fe/Al-ACF为2.0 g/L、pH=7、反应240 min时,Fe/Al-ACF对氨氮的去除率为90.52%,且在经过4次循环再生后去除率仍可达59.16%。Fe/Al-ACF对氨氮的吸附符合准二级动力学模型、Elovich模型以及Langmuir等温吸附模型,吸附过程为自发吸热的化学单分子层吸附,涉及静电吸引,吸附速率与表面吸附量有关。扫描电子显微镜(SEM)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FTIR)结合热力学分析结果表明:Fe/Al-ACF纤维束表面的沟壑间生长有大量呈针状和钟乳石状的铁铝氧化物晶体(Fe_(3)O_(4)、γ-Fe_(2)O_(3)和Al2O3),其参与了吸附,吸附过程存在络合反应与N、O之间的氢键结合作用。The ammonia nitrogen adsorption material Fe/Al-ACF was prepared by using activated carbon fiber(ACF)as the carrier and sludge acid extract(Sae)and ferrous chloride mixture as the modifier.Fe/Al-ACF had good stability in water and good ammonia nitrogen removal performance under neutral and alkaline conditions.When the temperature was 25℃,ammonia nitrogen was 20 mg/L,Fe/Al-ACF dosage was 2.0 g/L,pH was 7,and the reaction time was 240 min,the removal rate of ammonia nitrogen by Fe/Al-ACF was 90.52%,and the removal rate was still 59.16%after 4 cycles of regeneration.The adsorption of ammonia nitrogen by Fe/Al-ACF conformed to the quasi‑second‑order kinetic model,Elovich model and Langmuir isotherm adsorption model.The adsorption process was a spontaneous endothermic chemical monolayer adsorption involving electrostatic attraction,and the adsorption rate was related to the surface adsorption capacity.The results of scanning electron microscope(SEM),X‑ray diffractometer(XRD)and Fourier transform infrared spectroscope(FTIR)combined with thermodynamic analysis showed that there were a large number of acicular and stalactites shaped iron and aluminum oxide crystals(Fe_(3)O_(4),γ‑Fe_(2)O_(3)and Al2O3)growing between the ravines on the surface of Fe/Al-ACF,which participated in the adsorption process,and the adsorption process involved complex reaction and hydrogen bonding between N and O.

关 键 词：活性炭纤维(ACF) 污泥酸提液 给水污泥 氨氮 吸附 

分 类 号：TU992[建筑科学—市政工程]