Abstract:

Fe₃O₄/SBc composite was prepared by using chemical precipitation, the physical and chemical properties of biochar were analyzed by SEM, XRD, IR and VSM. Batch experiments were carried out to investigate the effects of solution pH, adsorbent dosage on sorption efficiency and the adsorption kinetics, isothems were investigated. The results showed that Fe₃O₄@SBc composite with paramagnetic property was prepared successfully by compositing Fe₃O₄ with sludge biochar(SBc), and it could be utilized easily under external magnetic field. The specific surface area and average pore size of Fe₃O₄@SBc is 394.48 m²/g and 33.24 nm, and removal rate of methyl orange attained 94.24%, when the concentration of methyl orange is 100 mg/L, the addition amount is 20 mg, the adsorption time is 240 min. The adsorption data fitted well with the pseudo-second order kinetic model and Langmuir isotherm model, which indicates that chemical adsorption is the main adsorption mechanism.

Key words: sludge biochar, adsorption, magnetism, methyl orange

摘要：

采用共沉淀法制备Fe₃O₄@SBc复合材料，通过扫描电镜（SEM）、X-射线晶体衍射（XRD）、红外光谱（IR）和磁滞回线（VSM）表征复合材料Fe₃O₄@SBc的物化性质，考察溶液pH、吸附剂添加量等因素对复合材料Fe₃O₄@SBc吸附效果的影响，并进行等温吸附模型和吸附动力学拟合。结果表明，污泥生物炭（SBc）表面成功负载Fe₃O₄纳米粒子，Fe₃O₄@SBc复合材料具有超顺磁性，可利用外加磁场快速分离。Fe₃O₄@SBc复合材料比表面积为394.48 m²/g，平均孔径33.24 nm，当模拟甲基橙废水质量浓度为100 mg/L，复合材料添加量为20 mg，处理时间240 min时，模拟废水中甲基橙的去除率为94.24%。吸附等温线数据符合Langmuir模型，吸附动力学数据符合拟二级动力学模型，说明吸附以化学单分子层为主。

关键词: 污泥生物炭, 吸附, 磁性, 甲基橙

CLC Number: 

• X703

• TQ424