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Adsorption capacity of sodium dodecyl sulfate activation okara for methylene blue on aqueous solution
Korean Journal of Chemical Engineering ( IF 2.7 ) Pub Date : 2022-01-06 , DOI: 10.1007/s11814-021-0880-7
Cailian Yu 1 , Bolin Li 1 , Fen Li 1 , Hong Yan 1 , Kexin Zhang 2
Affiliation  

Agricultural waste okara (OA) was selected as a precursor to prepare low-cost adsorbent for the removal of methylene blue (MB). Sodium dodecyl sulfate (SDS), as a kind of anionic surfactant, was loaded onto okara (SOA) to achieve high adsorption ability. Scanning electron microscopy, Fourier transform infrared spectrometer and X-ray diffraction were investigated for the materials characterization. The effect of pH, contact time, initial concentration, adsorbent dose and ionic strength was determined to explore the adsorption properties. The adsorption kinetics, adsorption isotherms, cost analysis of adsorbent and adsorption mechanism were discussed. And the adsorption equilibrium data fitted well with Langmuir model, while the calculated maximum adsorption capacity was 238.10 mg g−1 for OA and 334.83 mg g−1 for SOA, respectively. The kinetics data followed the pseudo-second-order model. Thermodynamic parameters (ΔHo, ΔGo and ΔSo) indicated the spontaneous and exothermal nature. This research reveals that SOA is an effective, low-cost and promising adsorbent on the adsorption of MB on aqueous solution.



中文翻译:

十二烷基硫酸钠活化豆渣对亚甲基蓝水溶液的吸附能力

选择农业废弃物豆渣 (OA) 作为前驱体来制备用于去除亚甲基蓝 (MB) 的低成本吸附剂。十二烷基硫酸钠(SDS)作为一种阴离子表面活性剂,负载在豆渣(SOA)上以实现高吸附能力。对扫描电子显微镜、傅里叶变换红外光谱仪和 X 射线衍射进行了材料表征研究。确定了 pH、接触时间、初始浓度、吸附剂剂量和离子强度的影响,以探索吸附性能。讨论了吸附动力学、吸附等温线、吸附剂成本分析和吸附机理。并且吸附平衡数据与Langmuir模型拟合良好,而计算出的最大吸附容量为OA的238.10 mg g -1和334.83 mg g-1分别用于 SOA。动力学数据遵循伪二级模型。热力学参数(ΔH o、ΔG o和ΔS o)表明自发和放热性质。该研究表明,SOA 是一种有效、低成本且有前景的吸附剂,可用于吸附 MB 的水溶液。

更新日期:2022-01-06
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