Chitosan was used as crosslinking agent to load bimetal particles onto bentonite. The Fe–Al bimetal chitosan bentonite (Fe–Al bimetal @ bent) complex was prepared for the efficient removal of nitrate from wastewater and its by-products at low temperature. The samples were characterized by Scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-Ray Diffraction (XRD), Zeta potential, X-ray photoelectron spectroscopy (XPS) and Brunauer–Emmett–Teller (BET) surface area and Energy Dispersive X-ray Detector (EDX). SEM and EDX showed that Fe⁰ was deposited on the surface of aluminum, the Fe–Al bimetal were surrounded by chitosan and bentonite. XRD showed that Al can effectively protect the reactivity of Fe. The experimental results of nitrate removal showed that pH was the main factor affecting on nitrate removal rate and performance. The removal efficiency of nitrate wastewater with a concentration of 50 mg/L was approximately 90% in 60min. Fe–Al bimetal @ bent has better nitrate removal performance and faster reduction rate at low temperature(2–7 °C) than normal temperature (25 °C). The reason was that chitosan, bentonite and bimetal have excellent synergistic effect. It can effectively improve the reaction rate, pH buffering capacity, reduce secondary pollution and total nitrogen (TN). Fe–Al bimetal @ bent has better N₂ selectivity than Fe–Al bimetal.

壳聚糖用作交联剂以将双金属颗粒负载到膨润土上。Fe-Al双金属壳聚糖膨润土（Fe-Al双金属@弯曲）复合物的制备是为了在低温下有效去除废水及其副产物中的硝酸盐。通过扫描电子显微镜（SEM），傅立叶变换红外光谱（FTIR），X射线衍射（XRD），Zeta电位，X射线光电子能谱（XPS）和Brunauer–Emmett–Teller（BET）表面积来表征样品和能量色散X射线探测器（EDX）。SEM和EDX表明Fe ⁰沉积在铝表面，Fe-Al双金属被壳聚糖和膨润土包围。XRD表明Al可以有效地保护Fe的反应性。硝酸盐去除的实验结果表明，pH是影响硝酸盐去除速率和性能的主要因素。在60分钟内，浓度为50 mg / L的硝酸盐废水的去除效率约为90％。与低温（25°C）相比，低温下（2-7°C）的Fe-Al双金属@弯曲具有更好的硝酸盐去除性能和更快的还原速率。原因是壳聚糖，膨润土和双金属具有优异的协同作用。它可以有效提高反应速率，pH缓冲能力，减少二次污染和总氮（TN）。Fe-Al双金属@弯曲的N ₂更好 选择性高于铁铝双金属。