ZnCl_2改性柠檬渣的吸附性能研究

Study on adsorption property of lemon residue modifed by ZnCl_2

研究了用10%的ZnCl_2化学改性柠檬渣的吸附性能,考察了改性前后柠檬渣对Cu^(2+)、Pb^(2+)和Cr^(6+)的吸附率变化情况。测定了柠檬渣的灰分、碘吸附值、比表面积和孔结构;利用红外光谱、紫外光谱、X射线衍射仪、扫描电镜和能谱对柠檬渣的结构进行了表征。研究结果表明:改性后的柠檬渣对Cu^(2+)、Pb^(2+)和Cr^(6+)的吸附率分别提高约10、2和1.2倍;改性后柠檬渣的孔容、孔径、灰分率和碘吸附值变化不大,比表面积增大了近3倍;改性并未改变柠檬渣的基本框架,改性后的柠檬渣在近紫外区有最大吸收波长;Cl^-能分别被Cu^(2+)、Pb^(2+)、Cr^(6+)完全取代,但形成的EDS峰不高。

In order to study the adsorption properties of lemon residues modified by chemical,The lemon residues were modified by 10% ZnCl2.The adsorption rates of Cu^2＋、Pb^2＋ and Cr^6＋ by the lemon residues were detected,and ash rate,iodine adsorption value,specific surface area and BET were detected too.The samples were characterized by IR,UV,XRD,SEM and EDS.The adsorption rate to Cu^2＋、Pb^2＋ and Cr^6＋ were lifted reached about 10.2and 1.2times,respectively.The change of the pore volume,the pore size,ash rate and the iodine adsorption value of lemon residue before and after modified was not much,but the specific surface area was expanded about 3times.The basic framework of lemon residues were not changed after modification,and there was maximum absorption wavelength of the modified lemon residues in the near ultraviolet region.The formation peak of EDS was not high.