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采用壳聚糖为原料，戊二醛进行交联,氯乙酸进行羧甲基化，制得羧甲基壳聚糖微球；然后以Ni2+为印迹离子通过分子印迹技术改性羧甲基壳聚糖微球，制得印迹改性羧甲基壳聚糖微球。考察了镍浓度、戊二醛用量、洗脱时间等因素对印迹交联改性的影响，实验结果显示最佳印迹改性条件为：镍离子浓度5g/L、戊二醛用量20mL、洗脱时间7h。探讨了印迹改性羧甲基壳聚糖微球吸附镍的影响因素，选出最佳吸附条件，结果表明：pH=8、60mg吸附剂用量、80min吸附时间、25℃吸附温度为最佳吸附条件。对自制的印迹改性羧甲基壳聚糖微球与壳聚糖用含Ni2+废水进行了吸附效果对比，其吸附率分别为62.45%和47.97%，表明印迹改性羧甲基壳聚糖微球的吸附性能相对与壳聚糖有了较大的提升。 如果写的太差，请帮忙翻译一下。。Carboxymethyl chitosan microspheres were prepared as raw product using chitosan as original material, glutaraldehyde as the cross-linking agent,and chloroacetic acid as the carboxymethylation substance.Then modified by molecular imprinting technology using Ni2+ ion as template.for use in the adsorbtion of Ni2+.The condition of imprinting modification and absotbtion were studied.The results showed that the best modification was got when Ni2+ concentration was 5g/L,glutaraldehyde dosage was 20mL and elutingtime is 7h and the maximum adsorbtion for Ni2+ occured at pH=8, adsorbentdosage was 60 mg,adsorption time was 80 min and adsorption temperature was 25℃.Compared absorbtions of modified carboxymethyl chitosan microspheres and chitosan to Ni2+ in wastewater which were 62.45% and 47.97%,indicating that the absorbtion property of the former is better. |
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2楼2012-05-18 09:28:17
vivanslum
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Mally89: 金币+1, 感谢应助！~欢迎常来！~吼吼！~\(^o^)/~ 2012-05-18 17:29:26
东坡小白: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 评价晚了。。非常感谢你的帮助！！ 2012-05-20 23:00:19
Mally89: 金币+1, 感谢应助！~欢迎常来！~吼吼！~\(^o^)/~ 2012-05-18 17:29:26
东坡小白: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 评价晚了。。非常感谢你的帮助！！ 2012-05-20 23:00:19
| Carboxymethyl chitosan microspheres were prepared by using chitosan as the original material, glutaraldehyde as the cross-linking agent, and chloroacetic acid as the carboxymethylation substance. Then the microspheres were furtherly modified by molecular imprinting technology using Ni2+ ion as template, to obtain the imprinted modified carboxymethyl chitosan microspheres. The influence of nickel concentration, the glutaraldehyde dosage, and elution time on the imprinted cross-linked modification was investigated. The results showed that the best modified conditions were: 5g/L Ni2+ concentration, 20mL glutaraldehyde and 7h elution time. The best adsorption conditions，where the maximum adsorption of nickel by modified carboxymethyl chitosan microspheres occurred，were that：pH=8, adsorbent dosage was 60 mg, adsorption time was 80 min and adsorption temperature was 25℃. We also compared the adsorption effects between self - made imprinting modified carboxymethyl chitosan microspheres and chitosan by using Ni2+-containing wastewater, and the adsorption rates were 62.45% and 47.97% respectively, indicating that the adsorption properties of modified carboxymethyl chitosan microspheres have been greatly improved. |
3楼2012-05-18 17:17:01
