MnO2 decoration onto the guava leaves: A sustainable and cost-effective material for methylene blue dye removal
Open accessAbstract
Excessive number of dyes in water is becoming the main cause of water pollution, which is very important to remove because it is harmful. Dye contaminated water is being treated by various methods. Adsorption method can be considered best for the study of dye removal due to several technological reasons. The adsorption method has also been emphasized in this study. In the present work, a nano-bio-composite was fabricated by growing manganese oxide nanoparticles on abundant cellulosic guava leaf powder. This allows nanocomposite to be prepared in large quantities at nominal cost. The characterization technique confirmed the irregular growth of manganese oxide nanoparticles onto the guava leaf powder. The electrostatic and non-electrostatic interactions was confirmed in between manganese oxide nanoparticles and the carbon structure of guava leaf powder. The massive functional groups were found to be in the prepared nano-bio-composite. The grain size of prepared material was in nano range. The developed nano-bio-composite was used to remove methylene blue from water. This showed a very good adsorptive capacity for methylene blue. The analyzed adsorption data was modelled through isotherms, kinetics and thermodynamics models. The nature of the adsorption process was determined to be spontaneous and exothermic. The reusability test was carried out for five adsorption-desorption cycles. The reusability results suggested the better removal efficiency (%) in the first two cycles with only 20 % reduction in removal efficiency (%). The leaching test result revealed the good stability of MnO2/GL at neutral pH. It was a unique and cheap adsorbent of its kind, which had not been noticed anywhere before.
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Recent improvements in the integration of nanomaterials with other substances have enhanced their adsorption effectiveness and decreased manufacturing costs, hence increasing their accessibility for large-scale applications.
“Recent improvements in the integration of nanomaterials with other substances have enhanced their adsorption effectiveness and decreased manufacturing costs, hence increasing their accessibility for large-scale applications.114”
From Emerging nanotechnology approaches for sustainable water treatment and heavy metals removal: a comprehensive review (2025) · cites this paper as [114]
The Introduction says combining nanoparticles with other materials can reduce cost and increase production and adsorption efficiency. It also describes biomass as affordable and available in bulk, but does not establish that these improvements have increased accessibility for large-scale applications. (LLM, conf=0.83)
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“114 In the last ten years, nanoremediation has been extensively used for the treatment of polluted locations, displaying considerable bene ts compared to traditional treatment techniques.”
- Authors
- Komby Abdulla, N., Alzahrani, E. A., Dwivedi, P., Goel, S., Hafeez, S., Khulbe, M., Ilahi Siddiqui, S., & Oh, S.
- Affiliations
- University of Ha'il (SA)
- University of Delhi (IN)
- Villanova University (US)
- Kyung Hee University (KR)
- Corresponding author
- Oh, Seungdae
- Venue
- Heliyon
- Publisher
- Elsevier BV
- Published
- 2024-07
- Volume
- 10
- Issue
- 14
- Pages
- e34267
- ISSN
- 2405-8440 (ISSN-L)
- PMC
- PMC11325273
- OpenAlex
- W4400495890
- Cited by
- 9
- References
- 43
- Citations by year
- 2026: 4 · 2025: 5
- FWCI
- 1.03
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Heliyon (publishedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Ministry of Environment
- Ministry of Education, India
- Korea Environmental Industry and Technology Institute
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
- Keywords
- manganese oxide nanoparticles, methylene blue adsorption, dye removal, low-cost adsorbent, adsorption isotherms, adsorption kinetics, adsorption thermodynamics, adsorbent reusability, leaching stability, water pollution
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