EXPERIMENTAL ACID-BASE PURIFICATION OF CARBONIZED RICE HUSKS: EXPLORING THE ADSORPTION EFFECTIVENESS OF UNVALUED RICE INDUSTRY RESIDUE

Larissa Crestani; Danielli Martins Sanderi; Yasmin Vieira; Guilherme Luiz Dotto

doi:10.15628/holos.2023.16309

Authors

Larissa Crestani Federal University of Santa Maria https://orcid.org/0000-0003-2014-9614
Danielli Martins Sanderi Federal University of Rio Grande do Sul https://orcid.org/0009-0008-0726-3838
Yasmin Vieira Federal University of Santa Maria https://orcid.org/0000-0003-4053-4042
Guilherme Luiz Dotto Federal University of Santa Maria https://orcid.org/0000-0002-4413-8138

DOI:

https://doi.org/10.15628/holos.2023.16309

Keywords:

activated carbon, modification, removal, dye, methylene blue

Abstract

The burning of rice husks produces natural silica and generates charcoal with excellent properties for the adsorption of different pollutants. The objective of this study was to enhance the adsorption properties of this industrial residue from burning rice husk through acid and base purifications. The raw coal (RC) was initially modified with HCl(aq.) and then with NaOH(aq.), and subsequently renamed MC. Efficiency was verified by the adsorption of methylene blue (MB) dye, considering a concentration of 10 mg L^-1, dosage of 0.05 g L^-1, pH 6.7, and 120 min. MB removal was 78% for RC and 97% for MC, with experimental capacities of 144.78 mg g^-1 and 180.78 mg g^-1, respectively. The kinetics were better adjusted by Avrami (R²0.99, error <2.8%). The properties of charcoal improved with the modification, presenting a more porous structure, greater surface area and functional groups that contributed to adsorption, proving that simple purification methods, such as acid-base purification, can be crucial for waste reuse.

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Author Biographies

Larissa Crestani, Federal University of Santa Maria

Master's student in Chemical Engineering from the Federal University of Santa Maria. Graduated in Chemical Engineering from the University of Passo Fundo. Experienced in research related to wastewater treatment, removal of emerging contaminants, adsorption, catalysis, development of materials (adsorbent composites, activated carbon, and catalysts), pyrolysis, and bioprocesses (fungi, bacteria, enzyme). Member of the Adsorptive and Catalytic Process Engineering (ENGEPAC) research group.

Danielli Martins Sanderi, Federal University of Rio Grande do Sul

Master's student in Engineering, specializing in Mineral Technology, Environmental Technology, and Extractive Metallurgy from the Federal University of Rio Grande do Sul, the focus of the research is on the treatment of produced water from offshore petroleum platforms, particularly in collaboration with Petrobras, at the Mineral and Environmental Technology Laboratory. The background includes experience in scientific research covering topics such as chitosan, adsorption, and fertilizer coating, demonstrating a keen interest in sustainability and innovation, as well as an ongoing commitment to contributing to advancements in these fields.

Yasmin Vieira, Federal University of Santa Maria

PhD Candidate in Physical Chemistry from the Federal University of Santa Maria/UFSM. I have BSc in Chemistry (2018) and a MSc in Physical-Chemistry (2020). I have devoted my work in the last years to understanding and unveiling the mechanisms that rule the efficiency of catalytic and adsoprtive processes, always from a statistical thermodynamics perspective. I am an expert in surface reactions, interfacial interactions and mechanism elucidation of any given environmental remediation process. I also dedicated my efforts in developing quantum mechanical calculations skills, as well as advanced chemical modelling. I am part of the Research Group on Adsorptive and Catalytic Process Engineering (ENGEPAC), where in addition to my research I am assigned to general group management and scientific communication.

Guilherme Luiz Dotto, Federal University of Santa Maria

Professor in the Chemical Engineering Department at the Federal University of Santa Maria (UFSM). Permanent member of the Chemical Engineering post-graduation program and also of the Chemistry post-graduation program. The research interests are focused on the following areas: transport phenomena, unit operations, thermochemical conversion, wastewater treatment, physicochemical treatments for wastewater, and separation processes. Specifically, the main research focuses on adsorption/biosorption of contaminants from aqueous solutions, preparation, and characterization of biomaterials and nanobiomaterials, wastewater treatment, waste management, pyrolysis, and drying. Has worked as an editor, editorial board member, referee, and author in several outstanding journals in these research areas.

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