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首页> 外文期刊>Journal of Hazardous Materials >Preparation of fibrous chitosan/sodium alginate composite foams for the adsorption of cationic and anionic dyes
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Preparation of fibrous chitosan/sodium alginate composite foams for the adsorption of cationic and anionic dyes

机译：用于吸附阳离子和阴离子染料的纤维壳聚糖/藻酸钠复合泡沫的制备

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摘要

Natural polysaccharide is attractive for preparing the environmentally friendly and highly efficient adsorbent. However, to obtain an efficient amphoteric absorbent for dealing with complex wastewater is still challenging. Herein, fibrous chitosan/sodium alginate composite foams were prepared by lyophilization with ternary acetic acid/water/tetrahydrofuran solvents, which had suitable morphology of interconnected pores and microscale fibers for dye adsorption. The amphoteric composite foams showed high adsorption capacities for both anionic Acid Black-172 (817.0 mg/g) and cationic Methylene Blue (1488.1 mg/g), which were far superior to those of the control samples prepared with traditional solvents of acetic acid/water. The adsorption kinetics and isotherm data showed that the adsorption followed the pseudo-second-order and Langmuir model. Further thermodynamics analysis revealed the adsorption was a spontaneous process. Meanwhile, the foams achieved effective adsorption capacity of AB-172 and MB dyes under a wide range of environmental pH, and maintained high adsorption efficiency even after four cycles. The adsorption mechanism is chemisorption, where the adsorption capacities for the anionic and cationic dyes were dependent on the mass ratio of chitosan to sodium alginate. As a novel amphoteric adsorbent, the fibrous chitosan/sodium alginate composite foam shows the potential to remove both cationic and anionic dyes from wastewaters.
机译：天然多糖对于制备环保和高效的吸附剂是有吸引力的。然而，为了获得用于处理复杂废水的有效两性吸收剂仍然挑战。在此，通过用三元乙酸/水/四氢呋喃溶剂冻干制备纤维状壳聚糖/藻酸钠复合泡沫，其具有相互连接的孔和微观纤维的合适形态，用于染料吸附。两性复合泡沫显示阴离子酸黑-172（817.0mg / g）和阳离子亚甲基蓝（1488.1mg / g）的高吸附能力，远远优于用乙酸的传统溶剂制备的对照样品的对照样品。水。吸附动力学和等温数据显示吸附遵循伪二阶和朗米尔模型。进一步的热力学分析显示吸附是自发过程。同时，泡沫在各种环境pH下实现了AB-172和MB染料的有效吸附能力，即使在四个循环之后也保持高吸附效率。吸附机理是化学吸附，其中阴离子和阳离子染料的吸附能力取决于壳聚糖对藻酸钠的质量比。作为一种新型两性吸附剂，纤维状壳聚糖/藻酸钠复合泡沫显示出从废水中除去阳离子和阴离子染料的可能性。

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