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Graphene-Biochar Composite for Effective Congo Red Dye Removal from Water

文献类型： 外文期刊

作者： Wang, Yu-Ying 1 ; Lyu, Hao-Hao 1 ; Hu, Yu-Di 3 ; Liu, Yu-Xue 1 ; He, Li-Li 1 ; Luo, Fan-Chen 4 ; Yang, Sheng-Mao 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, Hangzhou 310021, Peoples R China

2.Engn Res Ctr Biochar Zhejiang Prov, Hangzhou 310021, Peoples R China

3.Zhejiang A&F Univ, Coll Agr & Food Sci, Linan 311300, Peoples R China

4.Zhejiang Inst Mech & Elect Engn, Hangzhou 310053, Peoples R China

关键词： Graphene; Biochar; Congo red dye; Adsorption

期刊名称：JOURNAL OF ENVIRONMENTAL ENGINEERING （ 影响因子：2.479； 五年影响因子：2.253 ）

ISSN： 0733-9372

年卷期： 2022 年 148 卷 7 期

页码：

收录情况： SCI

摘要： Congo red (CR), a harmful pollutant, is increasingly contaminating aquatic environments. The removal of CR from wastewater is important. This study developed a novel graphene-biochar composite (GR-BC) to enhance CR treatment. The physicochemical properties of GR-BC were studied using Fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Brunauer-Emmett-Teller techniques. The CR adsorption capacities of biochar (BC) and GR-BC were analyzed using batch adsorption experiments. The effect of the initial pH of the CR solution, CR concentration, and adsorption time of CR were determined. The SEM, XRD, and FT-IR results showed that graphene was loaded successfully onto the BC. The BET results showed that GR-BC had a larger surface area than BC. The adsorption experiments showed that the highest CR adsorption efficiency occurred at pH 2, and reached 99.6% and 99.5% for BC and GR-BC, respectively. The GR-BC treatment was better at removing CR dye than was BC. The highest Langmuir adsorptive capacity of GR-BC (414.9 mg.g(-1)) was double of that of BC (193.8 mg.g(-1)). The higher R-2 values for the Freundlich isotherm than for the Langmuir isotherm indicate that the Freundlich isotherm model best fit the experimental data for both BC and GR-BC. The pseudo-second-order model (R-2 > 0.99) successfully described the adsorption kinetics of CR dye by both BC and GR-BC. In addition, the influence of ionic strength and coexisting ions on CR adsorption by BC was greater than that on CR adsorption by GR-BC, indicating that GR-BC is more stable than BC. Recycling experiments showed that CR removal still 50% after the fifth cycle for GR-BC, which was higher than that for BC (35%), suggesting that GR-BC has better reusability than BC. Thus, the GR-BC composite is a potential adsorbent for CR dye removal. (C) 2022 American Society of Civil Engineers.

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