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以盐酸浸泡锅炉房的废弃煤渣即改性煤渣为前驱体,采用溶剂热法制备了磁性四氧化三铁(Fe3O4)/改性煤渣复合材料,采用扫描电子显微镜(SEM)、X射线粉末衍射(XRD)、X射线光电子能谱仪(XPS)、傅里叶红外光谱仪(FT-IR)和物理吸附仪(BET)等对复合材料进行了表征分析.用磁性Fe3O4/改性煤渣复合材料作为吸附剂吸附Cr6+,并考察了吸附剂用量、吸附时间、Cr6+溶液的初始pH和初始浓度对材料吸附性能的影响.结果表明,在吸附剂用量为1.5g,吸附时间为30min,Cr6+溶液的初始pH=3.00的条件下,吸附效果最好.动力学分析可知,磁性Fe3O4/改性煤渣复合材料对Cr6+溶液的吸附符合准二级动力学方程,连续进行5次吸附/再生循环后,材料的吸附率均在90％以上,表明其具有较好的循环可再生性,同时Fe3O4本身具有的磁性可用于废水处理过程的快速分离.“,”The waste cinder in boiler room was modified by HCl.Fe3O4/modified cinders were prepared by insitu hydrothermal method.SEM,XRD,XPS,FT-IR and BET were used to characterize the microstructure and chemical composition. The effects of the adsorbent amount,adsorption time,pH value and the initial concentration of Cr6+ solution on the adsorptive capacity of Cr6+ were investigated. The results showed that the optimum conditions for the adsorption reaction were the adsorbent amount was 1.5g,the adsorption time 30min,and pH value of Cr6+solution was 3.00. The adsorption of Cr6+on Fe3O4/modified cinder was more consistent with pseudo-second-order kinetics.After 5 successive adsorption/regeneration cycles,the adsorption rate of adsorbent was more than 90％.Fe3O4/modified cinder had better regeneration potential.And the magnetic properties of iron oxide itself were embodied in the separation of the composite material easily and after treatment.