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首页> 外文期刊>RSC Advances >Response surface methodology for optimization of methylene blue adsorption onto carboxymethyl cellulose-based hydrogel beads: adsorption kinetics, isotherm, thermodynamics and reusability studies
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Response surface methodology for optimization of methylene blue adsorption onto carboxymethyl cellulose-based hydrogel beads: adsorption kinetics, isotherm, thermodynamics and reusability studies

机译：响应表面方法，用于优化亚甲基蓝吸附到羧甲基纤维素的水凝胶珠粒中：吸附动力学，等温，热力学和可重复使用性研究

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Environment-friendly composite hydrogel beads based on carboxymethyl cellulose (CMC), alginate (Alg) and graphene oxide (GO) were synthesized by an ionotropic gelation technique and studied as an efficient adsorbent for methylene blue (MB). The chemical structure and surface morphology of the prepared hydrogel beads were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), differential thermal analysis (DTA) and point of zero charge (pH(pzc)). A hybrid response surface methodology integrated Box-Behnken design (RSM-BBD) was successfully developed to model, simulate, and optimize the biosorption process. The synergistic effects between three critical independent variables including adsorbent dose (0.3-0.7 g), pH of the MB solution (6.5-9.5) and initial MB concentration (15-45 mg L-1) on the MB adsorption capacity (mg g(-1)) and removal efficiency (%) were statistically studied and optimized. The performance of the RSM-BBD method was found to be very impressive and efficient. Results proved that the adsorption process follows a polynomial quadratic model since high regression parameters were obtained (R-2-value = 99.8% and adjusted R-2-value = 99.3%). Analysis of variance (ANOVA) further confirms the validity of the suggested model. The optimal conditions for 96.22 +/- 2.96% MB removal were predicted to be 0.6 g of CMC-Alg/GO hydrogel beads, MB concentration of 15 mg L-1 and pH of 9.5 within 120 min. The adsorption equilibrium is better described by the Freundlich isotherm, indicating that physisorption is the rate controlling mechanism. The MB adsorption process was thermodynamically spontaneous and endothermic. A reusability study revealed that the prepared adsorbent is readily reusable. The adsorbent still maintains its ability to adsorb MB for up to four cycles. Results reported in this study demonstrated that CMC-Alg/GO hydrogel beads are an effective, promising and recyclable adsorbent for the removal of MB from aqueous solutions.
机译：基于羧甲基纤维素（CMC），藻酸盐（藻）和石墨烯（GO）的环保型复合水凝胶珠由离子型胶凝技术合成，并作为亚甲基蓝（MB）的有效吸附剂研究。制备的水凝胶珠的化学结构和表面形态通过傅里叶变换红外光谱（FTIR），扫描电子显微镜（SEM），热重分析（TGA），差分热分析（DTA）和零电荷点（PH（PC） ）））。混合响应曲面方法集成盒-Bhnken设计（RSM-BBD）成功开发成模拟，模拟和优化生物吸附过程。三个关键独立变量在包括吸附剂剂量（0.3-0.7g），Mb溶液（6.5-9.5）的pH的pH值（6.5-9.5）和Mb吸附容量（Mg G）的初始MB浓度（15-45mg L-1）之间的协同效应-1））统计研究和优化去除效率（％）。发现RSM-BBD方法的性能非常令人印象深刻和高效。结果证明，吸附过程遵循多项式二次模型，因为获得了高回归参数（R-2值= 99.8％并调整R-2值= 99.3％）。方差分析（ANOVA）进一步证实了建议模型的有效性。预测96.22 +/- 2.96％MB的最佳条件预测为0.6g CMC-ALG / GO水凝胶珠，MB浓度为15mg L-1和120分钟内的pH为9.5。 Freundlich等温线更好地描述了吸附均衡，表明物理吸附是速率控制机制。 MB吸附过程热力学自发和吸热。重复使用性研究表明，制备的吸附剂易于使用。吸附剂仍然保持其吸附MB最多四个循环的能力。该研究报告的结果证明CMC-ALG / GO水凝胶珠子是一种有效，有前途和可回收的吸附剂，用于从水溶液中除去MB。

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    《RSC Advances》 |2019年第65期|共12页
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