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Adsorption onto MWCNTs Coupled with Cloud Point Extraction for Dye Removal from Aqueous Solutions: Optimization by Experimental Design
Combinatorial Chemistry & High Throughput Screening ( IF 1.8 ) Pub Date : 2021-01-31 , DOI: 10.2174/1386207323666200618153940
Fariba Safa 1 , Bahare Osaghi 1
Affiliation  

Aims: The main aim of the study was to examine the feasibility and benefits of adsorption onto multi-walled carbon nanotubes (MWCNTs) coupled with cloud point extraction (CPE) for the removal of Rhodamine B (RB) from aqueous solutions.

Background: MWCNTs offer the particular features of the ideal adsorbents for the organic dyes such as hollow tubular structure and specific surface area. Nevertheless, they suffer from the drawbacks of low dispersion in the aqueous solutions and separation inconvenience from the media. Cloud point extraction, combined with the adsorption onto MWCNTs can be a promising method to overcome the problems.

Objective: In the study, adsorption onto MWCNTs coupled with CPE was applied for RB removal from aqueous solutions. The process was optimized by the response surface modeling method. Moreover, the applicability of the proposed method in the real sample analyses was investigated.

Methods: MWCNTs were used as adsorbent and Triton X-100 (TX-100) as the nonionic surfactant for CPE process. The experiments were carried out based on a Box-Behnken design (BBD) with the input variables of MWCNTs dosage (0.6-1.2 mg), solution pH (3–9), clouding time (20-40 min) and TX-100 concentration (10-20 v/v%) using 5 mg L-1 RB solutions.

Result: Regression analyses resulted in a statistically significant quadratic model (R2=0.9718, F=24.96, p<0.0001) by which the optimum levels of the variables were predicted as: MWCNTs dosage of 0.7 mg, pH=3, clouding time of 39.9 minutes and TX-100 concentration of 19.91% (v/v). The predicted conditions were experimentally validated by achieving an RB removal of 94.24%.

Conclusion: Based on the results, the combination of the environmentally friendly technique of CPE with adsorption onto MWCNTs allows the efficient removal of RB from water samples and the method can be effectively optimized by the response surface modeling.



中文翻译:

吸附到 MWCNTs 上结合浊点提取从水溶液中去除染料:通过实验设计优化

目的:该研究的主要目的是检查吸附到多壁碳纳米管 (MWCNT) 上并结合浊点萃取 (CPE) 从水溶液中去除罗丹明 B (RB) 的可行性和益处。

背景:多壁碳纳米管提供了理想的有机染料吸附剂的特殊特性,例如中空管状结构和比表面积。然而,它们存在在水溶液中分散性低和与介质分离不便的缺点。浊点提取与吸附在 MWCNTs 上相结合是克服这些问题的一种很有前景的方法。

目的:在研究中,吸附在 MWCNTs 上并结合 CPE 用于从水溶液中去除 RB。该过程通过响应面建模方法进行了优化。此外,研究了所提出的方法在实际样品分析中的适用性。

方法:MWCNTs用作吸附剂,Triton X-100(TX-100)用作CPE工艺的非离子表面活性剂。实验基于 Box-Behnken 设计(BBD)进行,输入变量为 MWCNTs 剂量(0.6-1.2 mg)、溶液 pH 值(3-9)、混浊时间(20-40 分钟)和 TX-100 浓度(10-20 v/v%) 使用 5 mg L-1 RB 溶液。

结果:回归分析产生了具有统计学意义的二次模型(R2=0.9718,F=24.96,p<0.0001),其中变量的最佳水平被预测为:MWCNTs 剂量为 0.7 mg,pH=3,混浊时间为 39.9分钟和 TX-100 浓度为 19.91% (v/v)。通过实现 94.24% 的 RB 去除率,对预测条件进行了实验验证。

结论:基于结果,CPE 的环保技术与吸附在 MWCNTs 上的结合可以有效地去除水样中的 RB,并且可以通过响应面建模有效地优化该方法。

更新日期:2021-02-11
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