In order to synthesize adsorbent that can effectively absorb heavy metals in a simple and economical way, this study described the fabrication of adsorbents based on cellulose acetate (CA). CA modified first by polyethyleneimine grafting (CAP) and then by ethylenediamine (CAPE) for enhancing Cu(II) and Pb(II) removal from water. The physico-chemical properties of the modified celluloses were analyzed. It was found that the adsorption functional groups (amino groups) were successfully grafted on cellulose and CAP converted from semi-crystalline to cellulose II after enhancement of ethylenediamine (EDA). Adsorption isotherm results showed that the Cu(II) and Pb(II) removal efficiency by CAPE was significantly higher than that by CAP, and CAP showed a higher adsorption capacity of Cu(II) and Pb(II) than CA, of which the adsorption isotherm modeled with Langmuir isotherms well. The adsorption capacity can significantly be affected by ionic strength and humic acid. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) results demonstrated the complexation between amino groups and Cu(II)/Pb(II) played an important role for adsorption onto CAPE.

为了合成能够以简单且经济的方式有效吸收重金属的吸附剂，本研究描述了基于醋酸纤维素（CA）的吸附剂的制备。首先通过聚乙烯亚胺接枝（CAP）修饰CA，然后通过乙二胺（CAPE）修饰，以增强从水中去除Cu（II）和Pb（II）的能力。分析了改性纤维素的理化性质。发现在乙二胺（EDA）增强后，吸附官能团（氨基）被成功接枝到纤维素上，并且CAP从半结晶转变为纤维素II。吸附等温线结果表明，CAPE去除Cu（II）和Pb（II）的效率显着高于CAP，并且CAP显示出比CA高的Cu（II）和Pb（II）吸附能力，其中用Langmuir等温线模拟的吸附等温线。吸附能力会受到离子强度和腐植酸的显着影响。傅里叶变换红外（FTIR）光谱和X射线光电子能谱（XPS）结果表明，氨基与Cu（II）/ Pb（II）的络合对CAPE的吸附起着重要作用。