Comparative Adsorption of Methylene Blue Dye on Hexane-Washed and Xanthated Spent Grated Coconut (Cocos nucifera L.): Isotherms, Thermodynamics, and Mechanisms

• Autorzy: Khalid Khadijah , Hanafiah Megat Ahmad Kamal Megat , Al-Amrani Waheeba A. , Malek Nik Ahmad Nizam Nik , Fatinathan Sharon

Identyfikatory

DOI

10.12911/22998993/145675

• Języki publikacji: EN

Abstrakty

EN

A batch system investigated the application of two types of chemically modified biosorbents derived from spent grated coconut (Cocos nucifera) powder to adsorb methylene blue (MB) from aqueous solutions. The biosorbents were characterised by spectroscopic and quantitative analyses. The assessment of MB adsorption onto the investigated biosorbents was studied at different experimental conditions with different pHs (2–9) and different initial concentrations of MB (10–400 mg/L) at three different temperatures (298, 308, and 318 K). The maximum adsorption capacity (q_max) of xanthated spent grated coconut (XSGC) was higher than that of hexane-washed spent grated coconut (HSGC). The thermodynamic study indicated that the MB adsorption process was spontaneous for both biosorbents. Desorption of MB-loaded biosorbents was carried out using HCl, NaOH, and Na₂EDTA solutions. A desorption ratio of more than 90% was obtained over three adsorption/desorption cycles for HSGC. However, XSGC demonstrated poor MB desorption, implying a stronger MB interaction with XSGC, which could be attributed to H-bonding, Yoshida H-bonding, n-π, and π-π bonding. The study showed that HSGC and XSGC could be applied as biosorbents to remove low MB concentrations from aqueous solutions.

Słowa kluczowe

EN

adsorption; isotherm; mechanism; methylene blue; spent grated coconut

• Wydawca: Polskie Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology
• Czasopismo: Journal of Ecological Engineering
• Rocznik: 2022
• Tom: Vol. 23, nr 3
• Strony: 1--11
• Opis fizyczny: Bibliogr. 29 poz., rys., tab.

Twórcy

autor

Khalid Khadijah

• Faculty of Applied Sciences, Universiti Teknologi MARA, 96400 Mukah, Sarawak, Malaysia

autor

Hanafiah Megat Ahmad Kamal Megat

• Faculty of Applied Sciences, Universiti Teknologi MARA, 26400 Jengka, Pahang, Malaysia

• https://orcid.org/0000-0001-8215-8036

autor

Al-Amrani Waheeba A.

• Department of Chemistry, Faculty of Science, Ibb University, Ibb, Yemen

autor

Malek Nik Ahmad Nizam Nik

• Department of Biosciences, Faculty of Science, Universiti Teknologi Malaysia, 81310, Johor Bharu, Malaysia

autor

Fatinathan Sharon

• Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur, 30450 Ipoh, Perak, Malaysia

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