Development of novel cross-linked chitosan for the removal of anionic Congo red dye

Zahir, Abdul; Aslam, Zaheer; Kamal, Muhammad Shahzad; Ahmad, Waqar; Abbas, Aqeel; Shawabkeh, Reyad

doi:10.1016/j.molliq.2017.09.006

Cited by 122 publications

(40 citation statements)

References 53 publications

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“…With solution pH increased, the electrostatic force was weakened and the adsorption capacity of CS-MWCNTs decreased. Similar result was obtained about CR adsorption onto raw chitosan [24] and chitosan coated magnetic iron oxide [33]. But the trend about effect of solution pH was different about light green adsorption onto PEI-modified MWCNTs [20].…”

Section: The Effect Of Ph On Adsorptionsupporting

confidence: 76%

“…The composite material not only overcomes the disadvantage that MWCNTs and CS which are difficult to separate in solution, but also has the advantages of having a large specific surface area of MWCNTs and a large number of adsorption sites of CS. The comparison of the adsorption capacity of CR with other adsorbents is shown in Table 1 [23][24][25][26][27][28]. It shows that CS-MWCNTs has a higher adsorption capacity for CR.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Congo red from solution using chitosan modified carbon nanotubes

Yang¹,

Du²,

Li³

et al. 2019

DWT

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Chitosan (CS) modified multi-walled carbon nanotubes (MWCNTs) were used as adsorbents (CS-MWCNTs) to adsorb Congo red (CR, anionic dye) from solution in batch mode. The structure and morphology of CS-MWCNTs were characterized by TEM, FTIR, Raman and XPS. The results from analysis of FTIR and XPS showed that CS was successfully loaded onto the MWCNTs. Raman analysis showed that the basic structure of MWCNTs after CS modification did not change. Adsorption studies were performed at different pH, coexisted ions concentrations, contact time and CR concentrations in the batch mode. Results showed that the pH of CR solution at 4.0 was best for the adsorption and the adsorption capacity could reach up to 623 mg•g-1 at 303K. The adsorption of the CR solution reached equilibrium within 8 h. Adsorption equilibrium data can be predicted by the Freundlich model while the kinetic adsorption data follow a pseudo-second-order model. Thermodynamic results showed that the adsorption process was spontaneous, and endothermic. The CR-loaded adsorbent can be regenerated using a 0.01 mol•L −1 NaOH solution, the regeneration rate can still reach 71% after three cycles. CS-MWCNTs may be available in removal of anionic dyes from solution.

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Section: The Effect Of Ph On Adsorptionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Adsorption of Congo red from solution using chitosan modified carbon nanotubes

Yang¹,

Du²,

Li³

et al. 2019

DWT

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“…The authors concluded that chitosan complexation was a procedure of choice for dye removal in terms of cost, efficiency, and reusability. Zahir et al (2017), El-Sayed et al (2017), and Lin et al (2017) also reported that cross-linked chitosan hydrogels were very efficient for the removal of dyes at different concentrations and competitive against commercial systems. The materials exhibited high biosorption capacities toward various dyes present in monocontaminated solutions and possessed a high rate of biosorption, high efficiency and selectivity in detoxifying either very dilute or concentrated solutions.…”

Section: A Recent Review Of the Literature On Dye Removal By Chitosanmentioning

confidence: 99%

“…Indeed, chitosan hydrogels are more selective than traditional materials and can reduce dye concentrations to ppb levels. Zahir et al (2017), El-Sayed et al 2017, and Lin et al (2017) concluded that the use of cross-linked chitosan hydrogels as biosorbents was a promising tool for the purification of dye-containing textile wastewaters.…”

Section: A Recent Review Of the Literature On Dye Removal By Chitosanmentioning

confidence: 99%

Dye removal by biosorption using cross-linked chitosan-based hydrogels

et al. 2019

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Synthetic dyes are an important class of recalcitrant organic compounds that are often found in the environment as a result of their wide industrial use. There are estimated to be more than 100,000 commercially available dyes. These substances are common contaminants, and many of them are known to be toxic or carcinogenic. Colored effluents from the industry is perceived by the public as an indication of the presence of a dangerous pollution. Even at very low concentrations, dyes are highly visible-an esthetic pollution-and modify the aquatic life and food chain, as a chemical contamination. Dye contamination of water is a major problem worldwide, and the treatment of wastewaters before their discharge into the environment has become a priority. Dyes are difficult to treat due to their complex aromatic structure and synthetic origin. In general, a combination of different physical, chemical and biological processes is often used to obtain the targeted water quality. Nonetheless, there is a need to develop new removal strategies and decolorization methods that are more effective, acceptable for industrial use and ecofriendly. Currently, there is increasing interest in the application of biological materials as effective adsorbents for dye removal. Among all the materials proposed, cross-linked chitosan-based hydrogels are the most popular biosorbents. These polymeric matrices are the object of numerous fundamental studies. In this review, after a brief description of the use of chitosan in wastewater treatment and the basic principles of chitosan-based hydrogels and biosorption, we focus on some of the work published over the past 5 years. Overall, these polymeric materials have demonstrated outstanding removal capabilities for some dyes. They might be promising biosorbents for environmental purposes.

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“…There are more than 100,000 commercial dyes with an annual production of over 7 × 10 5 tons year −1 [3]. The extensive application of dyes in industries brings about big amount of toxic dyes and pigments waste discharging to the environment, which subsequently causes serious environmental problems and threat to human's health [4,5]. The presence of organic dyes even in low concentrations has irreversible effects on human health from skin irritation, Heinz body formation, gastritis and tissue necrosis to the worst result of cancer [6].…”

Section: Introductionmentioning

confidence: 99%

One-pot synthesis of S-doped Fe2O3/C magnetic nanocomposite as an adsorbent for anionic dye removal: equilibrium and kinetic studies

Khoshsang

Ghaffarinejad

Kazemi³

et al. 2017

J Nanostruct Chem

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Novel S-doped Fe 2 O 3 /C nanocomposite was synthesized via a one-pot hydrothermal method and was used for the first time as an efficient adsorbent for Congo red dye (CR) removal from water solution. The obtained catalyst was characterized by various methods including Fourier transform infrared spectroscopy, energy dispersive X-ray spectrometry, vibration sample magnetometry, X-ray diffraction and field emission scanning electron microscopy. To improve the adsorption performance, some important parameters affecting dye removal were optimized such as adsorbent dosage, contact time, solution pH, initial dye concentration and ionic strength. At the optimum conditions, the maximum capacity of adsorption for this nanocomposite was 270.2 mg g −1 , which is better than other magnetic adsorbents for CR removal. The results of adsorption isotherm were matched with Langmuir model. Kinetic tests show that adsorption experimental data were best fitted by pseudo-first-order model. Graphical abstract

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Development of novel cross-linked chitosan for the removal of anionic Congo red dye

Cited by 122 publications

References 53 publications

Adsorption of Congo red from solution using chitosan modified carbon nanotubes

Adsorption of Congo red from solution using chitosan modified carbon nanotubes

Dye removal by biosorption using cross-linked chitosan-based hydrogels

One-pot synthesis of S-doped Fe2O3/C magnetic nanocomposite as an adsorbent for anionic dye removal: equilibrium and kinetic studies

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