Facile approach to synthesis super-adsorptive hydrogel based on hyperbranched polymer for water remediation from methylene blue

Ali

2022

Preprint

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Due to the wide variety of synthetic dyes present in wastewater, there has been an urgent need to develop adsorbent materials to remove both cationic and anionic dyes. Since the development of such materials is still challenge, this paper is an attempt to prepare an economic and eco-friendly adsorbent material from chitosan to remove both cationic and anionic dyes from aqueous solution. Hence, hybrid composites from chitosan (Cs), talc powder (T) and cloisite 30B (C) with different weight ratios of 1: 2: 0, 1: 2: 1 and 1: 2: 2 were prepared. Chemical structure, thermal stability and surface morphology of the prepared composites were studied by using FTIR, TGA and SEM. The affinity of the prepared composites towards adsorption of cationic crystal violet (CV) and anionic reactive yellow 145 (RY) dyes was investigated. The adsorption results showed that the composite with a weight ratio of 1: 2: 1 is the most effective adsorbent for removal of RY dye with 76.9 mg/g adsorption capacity, whereas the composite with a weight ratio of 1: 2: 2 exhibited the highest adsorption activity for CV dye (37.03 mg/g). The adsorption of RY and CV on these composites followed the pseudo second order model. The langmuir isotherm model described the experimental adsorption data better than the Freundlich, Dubinin–Radushkevich, and Temkin isotherm models, indicating a monolayer sorption process for both dyes.

Section: Influence Of Contact Timesupporting

confidence: 90%

Simultaneous removal of cationic crystal violet and anionic reactive yellow by using eco- friendly hybrid chitosan- talc-cloisite 30B composite

Ali

2022

Preprint

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“…Because all adsorbing sites are free, the dye molecules can interact with them, and the amount of residual dye molecules drops dramatically, causing higher removal efficiency. Afterwards, as the adsorption sites were saturated with pollutant molecules, the removal efficiency becomes almost constant at 270 min [68]. Similar findings were observed in other studies [69,70].…”

Section: Influence Of Contact Timesupporting

confidence: 89%

Simultaneous Removal of Cationic Crystal Violet and Anionic Reactive Yellow Dyes using eco-friendly Chitosan Functionalized by Talc and Cloisite 30B

Ali

2022

J Polym Environ

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Designing adsorbent materials that can effectively remove many types of organic dyes is crucial because of the wide diversity of synthetic dyes found in wastewater. Thus, this study presents the synthesis of economic and eco-friendly adsorbent composites composed of chitosan (Cs), talc (T), and Cloisite 30B clay (C) to remove both cationic crystal violet (CV) and anionic reactive yellow 145 (RY) dyes for the first time. Cs was functionalized with T and subsequently the CsTC1 and CsTC2 composites were prepared by sensitizing the obtained CsT with different weight ratios of Cloisite 30B (C). X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric analysis (TGA), N2 adsorption–desorption isotherm, and zeta potential analysis were employed to characterize the materials. The addition of T to Cs matrix improves the thermal stability, pore size, and pore volume with respect to pure Cs. The effect of C inclusion was examined by measuring the affinity of the prepared composites towards adsorption of cationic CV and anionic RY dyes in comparison to pure Cs and CsT composite. The adsorption results in a single dye solution revealed that the CsTC1 composite is the most effective adsorbent for removal of RY dye with 76.9 mg/g adsorption capacity, whereas the CsTC2 composite exhibited the highest adsorption activity for CV dye (37.03 mg/g). Furthermore, RY and CV co-adsorption on CsTC composites was tested from a mixed dye solution. The adsorption kinetics of RY and CV adsorption followed the pseudo second order model. Langmuir isotherm model described the experimental adsorption data better than the Freundlich, Dubinin–Radushkevich, and Temkin isotherm models, indicating a monolayer sorption process for both dyes. The proposed mechanism for RY and CV adsorption using CsTC composites was investigated.

“…Then by plotting ΔpH against pH initial , the pH PZC was determined from the curve at the intersection point at ΔpH = 0. [8,48]…”

Section: Determination Of Zero Charge Point (Ph Pzc )mentioning

confidence: 99%

“…Regeneration or desorption study for the prepared adsorbent is a very important study as it evaluates the applicability of the prepared adsorbent to be used in industrial sector. [ 8 ] The desorption of MB on the adsorbent nanocomposite film was studied using 25% acetone as follows: the adsorbent nanocomposite film after adsorbing MB was separated and immersed in 25% acetone for about 1 h under shaking. Subsequently, the desorbed nanocomposite film was collected and the mount of MB dye in the solution was measured.…”

Section: Characterizationmentioning

confidence: 99%

Enhancing the adsorption affinity of cellulose acetate film toward cationic dye by incorporating Cloisite 30B grafted with polyacrylic acid

Polymer Engineering & Sci

Moghazy

Amin

2022

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Cellulose acetate (CA) is known for its low adsorption affinity toward dyes, hence this study aims to improve its adsorption affinity toward cationic dyes by introducing Cloisite 30B grafted with polyacrylic acid (C30B‐g‐PAA). C30B‐g‐PAA was synthesized by grafting polyacrylic acid (PAA) onto Cloisite 30B (C30B) using in‐situ reversible addition fragmentation chain transfer (RAFT) polymerization. Different weight ratios of unmodified (raw) and modified (C30B‐g‐PAA) C30B (0, 25, and 50 wt%) were incorporated into CA matrices to prepare a series of CA nanocomposite films. The results showed that the adsorption affinity of the prepared nanocomposite films increased toward cationic methylene blue (MB) dye with incorporating either unmodified or modified C30B, but a significant improvement was observed with the incorporating C30B‐g‐PAA with a maximum adsorption capacity of 53 mg/g for a load of 50 wt%. This indicates that the surface modification of C30B with PAA was effective in enhancing the adsorption efficacy of CA. The kinetic and isotherm studies showed that the adsorption behavior of CA nanocomposite film with 50 wt% of C30B‐g‐PAA followed pseudo‐second‐order and Langmuir isothermal model. Regeneration study showed good reusability of CA nanocomposite film with 50 wt% of C30B‐g‐PAA. These results demonstrate that the nanocomposite film with 50 wt% of C30B‐g‐PAA can be used as a highly efficient, easy to separate, and reusable adsorbent material to remove MB dye from wastewater.