Статья

Malachite green and methylene blue dye removal using modified bagasse fly ash: Adsorption optimization studies

Azeb Gebre MeskelSchool of Chemical and Bio Engineering, Addis Ababa institute of Technology, Addis Ababa, Ethiopia, P.O. Box.1176Muhajir Mussa KwikimaDepartment of Environmental Engineering and Management, College of Earth Sciences and Engineering, The University of Dodoma, P.O. Box 11090, Dodoma TanzaniaBeteley Tekola MesheshaAfrica Center of Excellence for Water Management, Addis Ababa University, Addis Ababa, Ethiopia, P.O. Box.1176Nigus Gabbiye HabtuFaculty of Chemical and Food Engineering, Bahirdar Institute of technology, Bahir Dar University, P.o. Box 26S.V. Chinna Swami NaikDepartment of Civil Engineering, Indian Institute of Technology Roorkee, 247667, IndiaBhanu Prakash VellankiDepartment of Civil Engineering, Indian Institute of Technology Roorkee, 247667, India

2023en

ABI

Аннотация

Utilizing Bagasse Fly Ash (BFA) as an adsorbent, a byproduct from the sugar industry, proved effective in removing a mixture of Malachite Green and Methylene Blue dyes from aqueous solutions. To enhance its efficacy, the fly ash underwent chemical modification and underwent detailed characterization using FTIR, XRD, SEM, and TGA analyses. Subsequently, adsorption studies were conducted to optimize critical parameters—initial dye concentration, contact time, and pH levels—employing a Mixed-Level Factorial design to pinpoint the most favorable conditions for efficient dye removal. The modified Bagasse Fly Ash (BFA) resulted in a maximum adsorption capacity of 18.75 mg/g (71.5%) for Malachite Green and 15.5 mg/g (67.2%) for Methylene Blue at initial dye concentration of 100 mg/L, pH of 9.6, and time of 51.5 min. Analysis of the sorption data involved rigorous application of both Langmuir and Freundlich isotherm models, revealing a strong fit of the linear representation to the data for both dyes. Specifically, R2 values of 0.97 and 0.93 were observed for Malachite Green, while notably higher values of 0.99 and 0.96 were obtained for Methylene Blue, affirming an excellent model-data agreement. Additionally, a kinetic study revealed that the dye adsorption process (MB and MG) followed the pseudo-second-order kinetic model (R2 > 0.99), indicating that chemisorption as dominant adsorption mechanism and providing valuable insights into the dynamic behavior of the process.

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Идентификаторы

DOI: 10.1016/j.envc.2023.100829

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Цитирований: 2Использованных источников: 0

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