Optimization Using Box-Behnken Design for Sustainable Naphthol Green Removal by Moringa Biochar-Modified Mg/Fe LDH Nanosheets

IF 2.1 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Surveys from Asia Pub Date : 2024-07-03 DOI:10.1007/s10563-024-09429-y

Aya M. Kosba, Gihan M. El-Naggar, E. M. Elmaghraby, Hussein A. Khalaf

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Abstract

The potential of Moringa Olivera biochar-modified Mg/Fe layered double hydroxides (LDHs) nanosheets as a sustainable adsorbent for removing naphthol green (NG) has been studied. Mg/Fe-LDH modified with Moringa biochar was created using in situ co-precipitation method. The synthetic LDHs were characterized using thermogravimetric analysis (TGA), field emission scan electron microscope (FE-SEM), transmission electron microscopy (TEM), energy-dispersive x-ray spectroscopy (EDS), X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) techniques for nitrogen adsorption–desorption. Experimental design techniques are employed to optimize removal efficiency by examining factors such as pH, temperature, adsorbent dosage, and contact time. The resulting LDHs exhibits improved adsorption properties due to the combined effects of Mg/Fe LDHs and the high surface area of Moringa biochar (S_BET increased from 87 to 144 m²/g after modification with biochar). Through response surface methodology, optimal conditions are determined to maximize NG removal and found to be pH 7.8, contact time 150 min, dose 380 mg, and temperature 25°C. With an R² value of 0.999, 0.998 and an adjusted R² value of 0.997 and 0.993 in the RSM model for Mg/Fe and Mg/Fe-BC LDH, respectively, it can be concluded that the chosen model is appropriate for data analysis (quadratic model). Additionally, the adequacy precision was assessed using the signal-to-noise ratio, which was determined to be around 23 and 66 for Mg/Fe and Mg/Fe-BC LDH, respectively (significantly higher than the baseline of 4), indicating a satisfactory signal. The highest adsorption capacity of Mg/Fe and Mg/Fe-BC LDHs was determined to be 43 and 53 mg.g⁻¹ (with removal efficiencies of 82 and 97%, respectively). The Freundlich adsorption isotherm model testing characterized the removal of NG. A comprehensive kinetic study reveals a pseudo-first order. This study finds out the potential of Moringa biochar-modified Mg/Fe LDHs nanosheets as an effective green adsorbent for naphthol green removal in comparison with Mg/Fe free of biochar.

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利用盒式贝肯设计优化辣木生物炭改性镁/铁 LDH 纳米片对萘酚的可持续绿色去除

研究了经 Moringa Olivera 生物炭改性的镁/铁层状双氢氧化物（LDHs）纳米片作为可持续吸附剂去除萘酚绿（NG）的潜力。使用原位共沉淀法制造了用辣木生物炭修饰的镁/铁-层状双氢氧化物。使用热重分析法（TGA）、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）、能量色散 X 射线光谱法（EDS）、X 射线衍射法（XRD）、傅立叶变换红外光谱法（FTIR）和布鲁诺-艾美特-泰勒（BET）技术对合成的 LDH 进行了氮吸附-解吸表征。通过研究 pH 值、温度、吸附剂用量和接触时间等因素，采用实验设计技术来优化去除效率。由于 Mg/Fe LDHs 和 Moringa 生物炭的高表面积（使用生物炭改性后，SBET 从 87 m2/g 增加到 144 m2/g）的共同作用，产生的 LDHs 具有更好的吸附特性。通过响应面方法，确定了最大限度去除 NG 的最佳条件，即 pH 值为 7.8、接触时间为 150 分钟、剂量为 380 毫克、温度为 25°C。镁/铁和镁/铁-BC LDH 的 RSM 模型的 R2 值分别为 0.999、0.998，调整后的 R2 值分别为 0.997 和 0.993，因此可以得出结论，所选模型适合数据分析（二次模型）。此外，还利用信噪比评估了适当的精度，结果表明镁/铁和镁/铁-生化半胱氨酸 LDH 的信噪比分别为 23 和 66 左右（明显高于 4 的基线），表明信号令人满意。镁/铁和镁/铁-BC LDH 的最高吸附容量分别为 43 和 53 mg.g-1（去除率分别为 82% 和 97%）。Freundlich 吸附等温线模型试验描述了去除 NG 的特征。一项全面的动力学研究显示了假一阶。这项研究发现，与不含生物炭的镁/铁 LDHs 纳米片相比，辣木生物炭改性镁/铁 LDHs 纳米片具有作为一种有效的绿色吸附剂去除萘酚的潜力。

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来源期刊

Catalysis Surveys from Asia 化学-物理化学

CiteScore

4.80

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Early dissemination of important findings from Asia which may lead to new concepts in catalyst design is the main aim of this journal. Rapid, invited, short reviews and perspectives from academia and industry will constitute the major part of Catalysis Surveys from Asia . Surveys of recent progress and activities in catalytic science and technology and related areas in Asia will be covered regularly as well. We would appreciate critical comments from colleagues throughout the world about articles in Catalysis Surveys from Asia . If requested and thought appropriate, the comments will be included in the journal. We will be very happy if this journal stimulates global communication between scientists and engineers in the world of catalysis.