Enhancing Methylene Blue Dye Removal using pyrolyzed Mytella falcata Shells: Characterization, Kinetics, Isotherm, and Regeneration through Photolysis and Peroxidation

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Renata Silva de Lima, Josealdo Tonholo, Selvasembian Rangabhashiyam, Daniel Pinto Fernandes, Jordana Georgin, Carmem Lúcia de Paiva e Silva Zanta, Lucas Meili
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Abstract

The potential of pyrolyzed Mytella falcata shells as an adsorbent for removing methylene blue dye molecules from aqueous solutions was investigated. The study found that the adsorbent produced at 600 °C of pyrolysis temperature, with an adsorbent mass of 0.5 g, particle diameter of 0.297–0.149 mm, and pH 12.0, demonstrated the highest dye molecule removal efficiency of 82.41%. The material’s porosity was observed through scanning electron microscopy, which is favorable for adsorption, while Fourier-transform infrared spectroscopy and X-Ray diffraction analysis analyses confirmed the presence of calcium carbonate in the crystalline phases. The pseudo-second order model was found to be the best fit for the data, suggesting that the adsorption mechanism involves two steps: external diffusion and diffusion via the solid pores. The Redlich-Peterson isotherm model better represented the equilibrium data, and the methylene blue adsorption was found to be spontaneous, favorable, and endothermic. The hydrogen peroxide with UV oxidation was found to be the most efficient method of regeneration, with a regeneration percentage of 63% achieved using 600 mmol.L−1 of oxidizing agents. The results suggest that pyrolyzed Mytella falcata shells could serve as an ecologically viable adsorbent alternative, reducing the amount of waste produced in the local environment and at the same time removing pollutants from the water. The material’s adsorption capacity remained almost constant in the first adsorption-oxidation cycles, indicating its potential for repeated use.

Abstract Image

Abstract Image

利用热解镰孢壳增强对亚甲基蓝染料的去除:表征、动力学、等温以及通过光解和过氧化再生。
研究了热解镰孢壳作为吸附剂从水溶液中去除亚甲基蓝染料分子的潜力。研究发现,吸附剂在600 热解温度°C,吸附剂质量为0.5 g、 粒径0.297-0.149 mm,pH 12.0,显示出最高的染料分子去除效率,为82.41%。通过扫描电子显微镜观察到该材料的孔隙率,这有利于吸附,而傅里叶变换红外光谱和X射线衍射分析证实了结晶相中存在碳酸钙。伪二阶模型最适合数据,表明吸附机理包括两个步骤:外部扩散和通过固体孔的扩散。Redlich-Peterson等温线模型更好地代表了平衡数据,发现亚甲基蓝吸附是自发的、有利的和吸热的。发现紫外线氧化的过氧化氢是最有效的再生方法,使用600 mmol。L-1的氧化剂。结果表明,热解的镰孢壳可以作为一种生态上可行的吸附剂替代品,减少当地环境中产生的废物量,同时去除水中的污染物。该材料的吸附能力在第一次吸附-氧化循环中几乎保持不变,表明其具有重复使用的潜力。
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来源期刊
Environmental Management
Environmental Management 环境科学-环境科学
CiteScore
6.20
自引率
2.90%
发文量
178
审稿时长
12 months
期刊介绍: Environmental Management offers research and opinions on use and conservation of natural resources, protection of habitats and control of hazards, spanning the field of environmental management without regard to traditional disciplinary boundaries. The journal aims to improve communication, making ideas and results from any field available to practitioners from other backgrounds. Contributions are drawn from biology, botany, chemistry, climatology, ecology, ecological economics, environmental engineering, fisheries, environmental law, forest sciences, geosciences, information science, public affairs, public health, toxicology, zoology and more. As the principal user of nature, humanity is responsible for ensuring that its environmental impacts are benign rather than catastrophic. Environmental Management presents the work of academic researchers and professionals outside universities, including those in business, government, research establishments, and public interest groups, presenting a wide spectrum of viewpoints and approaches.
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