【摘要】 以核桃壳粉作为生物质原料，依次采用H₂O₂和FeCl₃为改性剂，在限氧条件下制备磁性核桃壳生物炭，然后以壳聚糖为改性剂、聚乙二醇为交联剂，制备了壳聚糖/磁性核桃壳生物炭复合材料（CS/MWSB）,采用SEM、FT-IR、N₂脱附、XRD、XPS、VSM技术对其形貌和理化性质进行表征，并通过静态试验考察了CS/MWSB对模拟废水中Pb（Ⅱ）的吸附性能。结果表明：CS/MWSB的表面有大量微孔结构，表面负载球状Fe₃O₄颗粒和壳聚糖，CS/MWSB的活性基团和芳香基团有所增加；壳聚糖负载量为30%的CS/MWSB对Pb（Ⅱ）的吸附能力最强；对于初始浓度为400 mg/L的Pb（Ⅱ）溶液，当吸附剂投加量为4 g/L时，在pH为5.0、温度为40℃吸附3 h时，CS/MWSB对Pb（Ⅱ）的吸附率达90.86%,吸附容量为89.86 mg/g; CS/MWSB对Pb（Ⅱ）的吸附符合准二级动力学方程，吸附过程以化学吸附为主。CS/MWSB可用于对于高浓度Pb（Ⅱ）废水的处理。更多还原

【Abstract】 The magnetic walnut shell biochar was prepared by using walnut shell powder as biomass raw material and H₂O₂ and FeCl₃ as modifiers in turn under oxygen-limited conditions, and then the chitosan/magnetic walnut shell biochar composite（CS/MWSB） was prepared by using chitosan as modifier and polyethylene glycol as cross linking agent, and SEM, FT-IR, N₂ desorption, XRD, XPS, and VSM techniques were used to characterize the morphological and physicochemical properties, and the adsorption performance of CS/MWSB on Pb（Ⅱ） in simulated wastewater was investigated by static tests. The results showed that: the surface of CS/MWSB had a large number of microporous structures, and the active groups and the aromatic group of CS/MWSB increased when the surface was loaded with spherical Fe₃O₄ particles and chitosan; the CS/MWSB with 30% chitosan loading had the strongest adsorption capacity for Pb（Ⅱ）; for the Pb（Ⅱ） solution with the initial concentration of 400 mg/L, when the adsorbent was dosed at 4 g/L, the adsorption capacity of CS/MWSB was increased by the adsorption of Pb（Ⅱ）. The adsorption rate of CS/MWSB for Pb（Ⅱ） was 90.86% and the adsorption capacity was 89.86 mg/g at pH 5.0 and temperature 40 ℃ for 3 h. The adsorption of Pb（Ⅱ） by CS/MWSB was in accordance with the quasi-secondary kinetic equation and the adsorption process was mainly chemisorption.更多还原