壳聚糖和菠萝皮渣纤维素交联复配物对铜离子的吸附特性研究

菠萝加工成罐头和菠萝汁后会产生大量的皮渣废弃物,因此,菠萝皮渣的再利用是资源再生与低碳生活的重要课题。通过充分利用农业废弃物菠萝皮渣纤维为填充剂,以乙二醇二缩水甘油醚(EGDE)为交联剂来修饰壳聚糖分子,改善其对有害重金属Cu2+的吸附性能。通过溶解度和脱水率测试,揭示了菠萝皮渣纤维素交联复配物比壳聚糖微粒在酸性介质中有较高的耐酸性,同时复配物比壳聚糖有更大的致密性和机械强度。吸附实验表明交联复配物对铜离子有较高的吸附容量。在铜离子初始浓度为100mg/L时,吸附容量在pH6附近达到最大,为32.5mg/g,在pH6,浓度为15mg/L的条件下交联复配物7h达到吸附平衡,平衡吸附量为6.67mg/g。

Study on the absorption property of copper ion by the crosslinked chitosan-pineapple peel cellulose compounds

Pineapple have produced a large amount of peel waste when being processed into can and juice foods.Therefore,utilization of pineapple peel waste is a significant topic of resource recycle and low-carbon lifestyle.Chitosan was modified by ethylene glycol diglycidyl ether(EGDE) as crosslinking agent and by making full use of pineapple peel which was used for the filler to improve the adsorption performance of copper ions.Through the experiments on dissolution rate and hydration rate,the results showed that the crosslinked compounds improved the acidic resistance of the chitosan beads,meanwhile,the addition of pineapple peel cellulose to chitosan made the chitosan beads materially denser and mechanically stronger.The adsorption experiments indicated that the crosslinked compounds had a higher adsorption capacity than chitosan for Cu2+ removal.The maximum adsorption was 32.5mg/g at pH6 and an initial Cu2+ concentration of 100mg/L.At an initial pH of 6 and an initial Cu2+ concentration at 15mg/L,the equilibrium adsorption capacity was 6.67mg/g at about 7h.