Efficient and Selective Adsorption of Cationic Dye Malachite Green by Kiwi-Peel-Based Biosorbents

In this study, pristine kiwi peel (KP) and nitric acid modified kiwi peel (NA-KP) based adsorbents were prepared and evaluated for selective removal of cationic dye. The morphology and chemical structure of KP and NA-KP were fully characterized and compared, and results showed nitric acid modificati...

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Published in:Molecules (Basel, Switzerland) Switzerland), 2023-07, Vol.28 (14), p.5310
Main Authors: Zhao, Yanjun, Liu, Xintong, Li, Wenhui, Pei, Suyun, Ren, Yifan, Li, Xinyang, Qu, Chen, Wu, Chuandong, Liu, Jiemin
Format: Article
Language:English
Subjects:
acid-modified adsorbent
Acids
Adsorbents
Adsorption
By products
Dyes
Fruits
Investigations
Kinetics
kiwi peel
malachite green
Management
Morphology
nitric acid modification
selective adsorption
Spectrum analysis
Water
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Summary:In this study, pristine kiwi peel (KP) and nitric acid modified kiwi peel (NA-KP) based adsorbents were prepared and evaluated for selective removal of cationic dye. The morphology and chemical structure of KP and NA-KP were fully characterized and compared, and results showed nitric acid modification introduced more functional groups. Moreover, the adsorption kinetics and isotherms of malachite green (MG) by KP and NA-KP were investigated and discussed. The results showed that the adsorption process of MG onto KP followed a pseudo-second-order kinetic model and the Langmuir isotherm model, while the adsorption process of MG onto NA-KP followed a pseudo-first-order kinetic model and the Freundlich isotherm model. Notably, the Langmuir maximum adsorption capacity of NA-KP was 580.61 mg g , which was superior to that of KP (297.15 mg g ). Furthermore, thermodynamic studies demonstrated the feasible, spontaneous, and endothermic nature of the adsorption process of MG by NA-KP. Importantly, NA-KP showed superior selectivity to KP towards cationic dye MG against anionic dye methyl orange (MO). When the molar ratio of MG/MO was 1:1, the separation factor (α ) of NA-KP was 698.10, which was 5.93 times of KP. In addition, hydrogen bonding, π-π interactions, and electrostatic interaction played important roles during the MG adsorption process by NA-KP. This work provided a low-cost, eco-friendly, and efficient option for the selective removal of cationic dye from dyeing wastewater.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules28145310