Eco-friendly porous carboxymethyl cellulose/dextran sulfate composite beads as reusable and efficient adsorbents of cationic dye methylene blue
Eco-friendly porous carboxymethyl cellulose/dextran sulfate composite beads as reusable and efficient adsorbents of cationic dye methylene blue
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DOI：
10.1016/j.ijbiomac.2019.03.164
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发表时间：
2019-07-01
影响因子：
8.2
通讯作者：
Ferfera-Harrar, Hafida
中科院分区：
文献类型：
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作者：
Benhalima, Tayeb;Ferfera-Harrar, Hafida
以十二烷基硫酸钠（SDS）为成孔模板，采用离子型凝胶法制备了交联羧甲基纤维素（CMC）和硫酸葡聚糖（DS）包埋于网络中的生态友好型水凝胶复合微球。用FTIR、SEM/EDX和TGA对复合材料进行了表征。该复合材料具有多孔结构，溶胀性能随着DS含量的增加而增强，同时具有pH敏感性。通过改变pH值、吸附剂用量、接触时间、染料浓度和温度等影响因素，研究了DS对复合材料吸附阳离子染料亚甲基蓝（MB）的影响。结果表明，提高珠粒中DS含量可显著提高吸附性能。动力学和等温吸附研究揭示了伪二级和Langmuir等温线作为拟合模型。发现最大Langmuir平衡吸附容量（q（m））从C/D 0的82 mg g（-1）增加到C/D1的526 mg g（-1）。热力学研究揭示了该过程的自发性和吸热性。此外，毫凝胶显示出良好的可重复使用性后，五个吸附/解吸循环，并在其去除能力的增加相比，开始的，达到714毫克g（-1）的R-C/D1。该复合材料制备简单，回收方便，吸附效果好，再生性能好，可作为低成本的吸附剂应用于废水处理。(C)2019 Elsevier B. V.保留所有紧身衣。
Eco-friendly hydrogel composite beads based on crosslinked-carboxymethyl cellulose (CMC) and dextran sulfate (DS) embedded within network were prepared using ionotropic gelation in presence of sodium n-dodecyl sulfate (SDS) as pore-forming template. The milligels composites C/Dx were characterized by FTIR, SEM/EDX and TGA analyses. The composites exhibited porous structure and enhance in swelling properties with enriching DS as well as pH-sensitivity. The effect of DS on adsorption of composites for cationic dye methylene blue (MB) was investigated by changing influencing factors: pH, adsorbent dosage, time contact, dye concentration, and temperature. The results revealed that adsorption performances were remarkably improved by increasing DS content into beads. Kinetics and isotherm adsorption studies revealed pseudo second-order and Langmuir isotherm as befitting models. The maximum Langmuir equilibrium adsorption capacity (q(m)) was found to increase from 82 mg g(-1) for C/D0 to 526 mg g(-1) for C/D1. Thermodynamic study revealed spontaneous and endothermic process nature. Furthermore, milligels displayed good reusability after five adsorption/desorption cycles and with an augment in their removal ability compared to starting ones, reaching 714 mg g(-1) for R-C/D1. In view of easy preparation and recovery, effectiveness adsorption and good regeneration, the composites could be applied as low-cost adsorbents in wastewater treatment. (C) 2019 Elsevier B.V. All tights reserved.