梧桐纤维素的改性及其对铜离子的吸附

Modification of chinar cellulose and the adsorption of copper ions

对废弃物梧桐纤维素进行提取纯化,选用硝酸铈铵为引发剂,丙烯腈为单体,制备梧桐纤维素接枝聚丙烯腈(CC-g-PAN)聚合物,对支链氰基进行偕胺肟化,制备梧桐纤维素接枝聚偕胺肟(CC-g-PAO)。采用傅里叶变换红外光谱和扫描电子显微镜对纤维素结构和表面形貌进行表征,研究了CC-g-PAO对Cu^2+的吸附能力,分析吸附时间、pH和初始质量浓度对原纤维素和改性纤维素吸附铜离子能力的影响。当pH为4、吸附时间为24 h、初始质量浓度为200 mg/L时,CC-g-PAO对铜离子的吸附量可达84 mg/g。梧桐纤维素对铜离子的吸附量为34 mg/g,改性后的梧桐纤维素对铜离子的吸附量是原纤维素的2.5倍。

Chinar cellulose-graft-polyacrylonitrile(CC-g-PAN)was synthesized after chinar cellulose extracted and purified from the chinar balls using ceric ammonium nitrate as the initiator and acrylonitrile as the monomer.The branched chain PAN was amidoximized to prepare chinar cellulose-graft-polyamidoxime(CC-g-PAO).The structure and surface morphology of CC-g-PAO and chinar cellulose were characterized by Fourier transform infrared spectroscopy and scanning electron microscope,respectively.The fabricated CC-g-PAO was used as adsorbent for Cu^2+in water.The effects of time,pH and the initial concentration on the adsorption capacity of Cu^2+were examined.As the pH was 4,the adsorption time was 24 h,and the initial concentration was 200 mg/L,1 g CC-g-PAO could adsorb 84 mg of Cu^2+,while the adsorption capacity of CC on Cu^2+was 34 mg/g.The adsorption capacity of modified chinar cellulose on Cu^2+was 2.5 times of that of original cellulose.