Super and Selective Adsorption of Cationic Dyes onto Carboxylate-Modified Passion Fruit Peel Biosorbent.

Kaiwei Chen,Peng Gao,Linlin Du,Yuanli Liu,Junli Zheng,Hua Lin

doi:10.3389/fchem.2021.646492

Kaiwei Chen, Peng Gao + Show 4 more

Open Access

https://doi.org/10.3389/fchem.2021.646492

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Abstract

The carboxylate-functionalized passion fruit peel (PFPCS) was an efficient and rapid biosorbent for wastewater treatment. The PFPCS exhibited excellent selectivity to the cationic dyes, where the maximum adsorption capacities for methylene blue (MB) and methyl violet (MV) were 1,775.76 mg g−1 and 3,756.33 mg g−1, respectively. And the adsorption process of MB and MV on PFPCS reached equilibrium within 20 min. Moreover, the adsorption conditions and mechanisms were investigated. The adsorption process was in good agreement with the pseudo-second-order and Langmuir isotherm models. The adsorption mechanism was also proposed to be electrostatic interaction and hydrogen bond. After six cycles of desorption-adsorption, the removal efficient of MB and MV could be kept above 95%. Thus, PFPCS was considered as a highly efficient absorbent for removing cationic dyes from polluted water due to excellent adsorption characteristics, low cost and environmental friendliness.

Highlights

Over the past decades, dyes are widely used in textile, paper printing, color photography, food, cosmetics, pharmaceuticals, and leather industries
The results indicated that the succinic anhydride was successfully introduced into the surface of PFPC with a high number of carboxyl groups
In the higher temperature range, thermal decomposition behavior of PFPCS is different from PFPC, which might be attributed to the thermal cleavage of the organic material and the scission of the glucosidic units

Summary

Introduction

Dyes are widely used in textile, paper printing, color photography, food, cosmetics, pharmaceuticals, and leather industries. The discharge of a large amount of dye wastewater into the water body seriously threatens the ecosystem and human beings and has attracted considerable attention worldwide (Afkhami and Moosavi, 2010). Most dyes with aromatic rings are hard to be degraded by light, heat, microorganisms, and chemicals and their transformation products are carcinogenic, teratogenic, and mutagenic (Franco et al, 2018). Dye pollutants need to be urgently removed before the discharge of wastewater into the natural environment. (2018), biodegradation Sosa-Martínez et al (2020), chemical precipitation Shen et al (2019), and adsorption Kong et al (2020); Zhao et al (2020), are used to treat dye wastewater. Adsorption is regarded as the most promising technology owing to its low cost, great selectivity, and ease of operation

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