Multifunctional amphoteric resin to remove both anionic and cationic dyes from aqueous solution

2021 ◽  
pp. 51283
Author(s):  
Ramazan Coşkun ◽  
Kadriye Öncel ◽  
Yasin Akköz
2020 ◽  
Vol 16 ◽  
Author(s):  
Reda M. El-Shishtawy ◽  
Abdullah M. Asiri ◽  
Nahed S. E. Ahmed

Background: Color effluents generated from the production industry of dyes and pigments and their use in different applications such as textile, paper, leather tanning, and food industries, are high in color and contaminants that damage the aquatic life. It is estimated that about 105 of various commercial dyes and pigments amounted to 7×105 tons are produced annually worldwide. Ultimately, about 10–15% is wasted into the effluents of the textile industry. Chitin is abundant in nature, and it is a linear biopolymer containing acetamido and hydroxyl groups amenable to render it atmospheric by introducing amino and carboxyl groups, hence able to remove different classes of toxic organic dyes from colored effluents. Methods: Chitin was chemically modified to render it amphoteric via the introduction of carboxyl and amino groups. The amphoteric chitin has been fully characterized by FTIR, TGA-DTG, elemental analysis, SEM, and point of zero charge. Adsorption optimization for both anionic and cationic dyes was made by batch adsorption method, and the conditions obtained were used for studying the kinetics and thermodynamics of adsorption. Results: The results of dye removal proved that the adsorbent was proven effective in removing both anionic and cationic dyes (Acid Red 1 and methylene blue (MB)), at their respective optimum pHs (2 for acid and 8 for cationic dye). The equilibrium isotherm at room temperature fitted the Freundlich model for MB, and the maximum adsorption capacity was 98.2 mg/g using 50 mg/l of MB, whereas the equilibrium isotherm fitted the Freundlich and Langmuir model for AR1 and the maximum adsorption capacity was 128.2 mg/g. Kinetic results indicate that the adsorption is a two-step diffusion process for both dyes as indicated by the values of the initial adsorption factor (Ri) and follows the pseudo-second-order kinetics. Also, thermodynamic calculations suggest that the adsorption of AR1 on the amphoteric chitin is an endothermic process from 294 to 303 K. The result indicated that the mechanism of adsorption is chemisorption via an ion-exchange process. Also, recycling of the adsorbent was easy, and its reuse for dye removal was effective. Conclusion: New amphoteric chitin has been successfully synthesized and characterized. This resin material, which contains amino and carboxyl groups, is novel as such chemical modification of chitin hasn’t been reported. The amphoteric chitin has proven effective in decolorizing aqueous solution from anionic and cationic dyes. The adsorption behavior of amphoteric chitin is believed to follow chemical adsorption with an ion-exchange process. The recycling process for few cycles indicated that the loaded adsorbent could be regenerated by simple treatment and retested for removing anionic and cationic dyes without any loss in the adsorbability. Therefore, the study introduces a new and easy approach for the development of amphoteric adsorbent for application in the removal of different dyes from aqueous solutions.


2019 ◽  
Vol 127 ◽  
pp. 110-118 ◽  
Author(s):  
Guanhua Wang ◽  
Qingjun Liu ◽  
Minmin Chang ◽  
Jinmyung Jang ◽  
Wenjie Sui ◽  
...  

2019 ◽  
Vol 43 (5) ◽  
pp. 2400-2410 ◽  
Author(s):  
Mona Rouhi ◽  
Moslem Mansour Lakouraj ◽  
Hamed Tashakkorian ◽  
Vahid Hasantabar

In this study, a copolymer of aniline and indole P(ANI-co-IN) and its nanocomposites based on graphene oxide (GO) and functional carbon nanotubes (CNT-COOH) were synthesized by heterogeneous emulsion polymerization.


2018 ◽  
Vol 47 (37) ◽  
pp. 12979-12983 ◽  
Author(s):  
Ya-Ru Gong ◽  
Wei-Chao Chen ◽  
Liang Zhao ◽  
Kui-Zhan Shao ◽  
Xin-Long Wang ◽  
...  

Two new VMOPs with cuboctahedral geometries were synthesized based on [V6O6(OCH3)9X] (X = VO4 or SO4) and the rigid tridentate carboxylate ligand H3TATB, which present selective adsorption toward cationic dyes in aqueous solution.


2009 ◽  
Vol 6 (3) ◽  
pp. 737-742 ◽  
Author(s):  
T. Santhi ◽  
S. Manonmani ◽  
S. Ravi

A new, low cost, locally available biomaterial was tested for its ability to remove cationic dyes from aqueous solution. A granule prepared from a mixture of leafs, fruits and twigs ofMuntingia calaburahad been utilized as a sorbent for uptake of three cationic dyes, methylene blue (MB), methylene red (MR) and malachite green (MG). The effects of various experimental parameters (e.g.,contact time, dye concentration, adsorbent dose and pH) were investigated and optimal experimental conditions were ascertained. Above the value of initial pH 6, three dyes studied could be removed effectively. The isothermal data fitted the Langmuir and Freundlich isotherm models for all three dyes sorption. The biosorption processes followed the pseudo-first order rate kinetics. The results in this study indicated thatMuntingia calaburawas an attractive candidate for removing cationic dyes from the dye wastewater.


2012 ◽  
Vol 47 ◽  
pp. 223-227 ◽  
Author(s):  
Yuanchao Pei ◽  
Jing Liu ◽  
Zhenning Yan ◽  
Zhiyong Li ◽  
Jing Fan ◽  
...  

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