为解决工业废水中大量重金属离子对生态环境造成严重破坏的问题,利用羧甲基半纤维素(SH)与苯甲醛改性的壳聚糖(CS)在交联剂环氧氯丙烷作用下得到具有吸附性能的复合材料(SH/CS),并对SH/CS进行了表征及探究其对铜离子(Cu2+)的吸附性能。结果表明:成功制得SH/CS。扫描电子显微镜分析发现,SH/CS的交联度过低,微观孔隙较大,结构较松散,交联度过高则会使微孔产生一定粘结甚至消失;研究了SH/CS对Cu2+的吸附性能,吸附容量在一定范围内随着吸附时间的延长和交联度的增大而增大,但交联度过大易增大吸附剂的粘结程度,减少暴露的活性位点,使吸附过程受到抑制,吸附时间为3h,交联度为8.02mL条件下,SH/CS对Cu2+的吸附容量最大达到30.87μg,具有较好的吸附性能。
In order to solve the problem that a lot of heavy metallic ions existing in industrial sewage have shown to be seriously destructive to ecological environment,the carboxymethyl hemicellulose(SH) and chitosan(CS) modified by benzaldehyde were used to prepare the composite(SH/CS) through epichlorohydrin as the crosslinking agent.Then,SH/CS was characterized and its adsorption property for the copper ions (Cu2+) were studied.The results showed that the composite was successfully synthesized.SEM results indicated that with decreasing the crosslinking degree,the micropores of SH/CS became large and the structure was loose while the higher crosslinking degree would make the micropores bond or even disappear.SH/CS was also used for the adsorption of copper ions,indicating that within a certain range,the adsorption capacity increased with the extension of adsorption time and the crosslinking degree.However,excessive crosslinking degree would make the bonding degree of adsorbent increased and the exposed active sites reduced,thus preventing the adsorption process.The maximum adsorption capacity was 30.87μg when the adsorption time was 3h and crosslinking degree was 8.02mL,Which showed a good adsorption performance.
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基金资助
四川省教育厅项目(15ZB0018);四川省科技计划项目(2017JY0118);四川省创新训练项目(201610626052)
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