Amine functionalized sodium alginate hydrogel for efficient and rapid removal of methyl blue in water

Godiya, Chirag B.; Xiao, Yonghou; Lü, Xiaolin

doi:10.1016/j.ijbiomac.2019.12.139

Cited by 122 publications

(45 citation statements)

References 72 publications

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“…Dyes may undergo denaturation, precipitation, and complexation reactions at different pH, [ 37–39 ] and the electrostatic and molecular interactions between the adsorbent and dye molecules are affected by the pH of the solution [ 40,41 ] ; therefore, the pH of the solution is the key parameter for dye adsorption. Here, the influence of solution pH on the adsorption properties of CS/MCC/CA‐CDs sponge was evaluated from pH 7 to pH 13 (Figure 5).…”

Section: Resultsmentioning

confidence: 99%

“…[ 23 ] The poor adsorption capacity at pH < 10 can be attributed to the competitive adsorption between the H + and MB molecules and partial protonation of –NH 2. [ 39 ] The adsorption capacity increased significantly due to –NH 2 deprotonation at pH = 10. However, the structure of the CS/MCC/CA‐CDs sponge was destroyed due to the weakened hydrogen bonding under a strong alkali environment (pH > 10), [ 32 ] resulting in the sharp decrease in the adsorption capacity.…”

Section: Resultsmentioning

confidence: 99%

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Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Yuan

Zhu

et al. 2021

Luminescence

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For environmental protection, organic dyes and solvents of industrial wastewater must be eliminated. Here, a citric acid‐based carbon dots (CA‐CDs) crosslinked chitosan/microcrystalline cellulose (CS/MCC/CA‐CDs) sponge was synthesized to study its adsorption performance for methyl blue (MB) dye. The morphology of the sponge was a tangled fibre with a bundle formed by hydrogen bonds between CA‐CDs and the CS/MCC composite matrix. The abundant amount of tangled fibre bundle units can offer plentiful active adsorption sites to collect the dye molecules. The adsorption capacity of the CS/MCC/CA‐CDs sponge toward MB was 306.8 mg/g at pH 10 and a temperature of 298 K. In addition, the pseudo‐second‐order kinetic model was matched with the adsorption kinetic experimental data, and the adsorption isotherm data can be described by the Langmuir models. This study proposed that the CS/MCC/CA‐CDs sponge adsorbent creates tremendous potential application value in wastewater treatment due to its fast kinetics, high adsorption capacity, simple preparation, and eco‐friendly properties.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Yuan

Zhu

et al. 2021

Luminescence

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“…This result indicates that EPI has been reacted with the primary and secondary amines of PEI as well as the OH of cellulose, and combined them to form covalent bonds. From the enhanced CO peak at 1029 cm −1 , it is inferred that EPI also grafted β ‐CD onto PEI 35 . β ‐CD was grafted onto the surface chain of CNC‐PEI, and thus CNC‐PEI‐CD was successfully prepared.…”

Section: Resultsmentioning

confidence: 99%

Efficient removal of methyl orange by nanocomposite aerogel of polyethyleneimine andβ‐cyclodextringrafted cellulose nanocrystals

et al. 2021

J of Applied Polymer Sci

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Owing to the high specific surface area and lightweight, aerogels exhibit excellent adsorption capacity that can be tailored for the fabrication of high‐performance environmental purification materials. Cellulose nanocrystal (CNC) is an abundant, bio‐based, low‐density one dimensional (1D) nanomaterials with high‐respect ratio. In this work, CNC is first chemically grafted with polyethylenimine (PEI) and further by β‐cyclodextrin (β‐CD), which is subsequently crosslinked by polyacrylamide (PAM) to prepare the composted aerogel (CNC‐PEI‐CD/PAM), and being endowed high‐adsorption capacity for methyl orange (MO) (155.93 mg g−1) and removal rate (97.46%). Our unique strategy overcomes the low graft efficiency of β‐CD directly onto CNC by connecting PEI. Besides, CNC‐PEI‐CD/PAM not only shows superior adsorption performance to methyl orange, attributing to the unique “selective” cavity structure of β‐CD and dense surface charge of PEI, but also displays the desired reusability. This material shows the huge potential in water purification.

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“…For the immobilization of the microorganisms, sodium alginate was used as a support. This material is economic and has been widely used in the wastewater treatment (Godiya, Xiao, & Lu, 2020; Shen, Zhao, Liu, Mao, & Morgan, 2018; Wang, Gao, Zimmerman, Zheng, & Lyu, 2018). Calcium chloride was used to harden the beads.…”

Section: Methodsmentioning

confidence: 99%

Kinetics of a fixed bed reactor with immobilized microorganisms for the removal of organic matter and phosphorous

Bustos-Terrones

Ramírez-Pereda

Bustos-Terrones

et al. 2020

Water Environment Research

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The biodegradation of domestic wastewater contaminants has been carried out using microorganisms immobilized in sodium alginate gel (Alg‐Na). A fixed bed reactor with immobilized microorganisms was used for the treatment of domestic wastewater. A wastewater pretreatment was carried out to remove the larger particulate matter, which consisted of a reactor packed with different materials (anthracite, zeolite, and activated carbon). Later, a second reactor packed with balls with immobilized microorganisms was used to eliminate organic matter and nutrients. 2.5% w/v of Alg‐Na was used as a support to immobilize the microorganisms. According to the results, a total phosphorus (TP) and chemical oxygen demand (COD) removal of 94.26% and 78.25% was obtained, respectively. In addition, the degradation rate for both organic matter and phosphorous was studied by using the kinetic model for fix bed reactor. © 2020 Water Environment Federation Practitioner points Phosphorous and organic matter removal by adsorption and immobilized microorganisms. High removal efficiency of phosphorous and organic matter was found. An innovative wastewater treatment alternative is proposed. Kinetic model for fixed bed reactor is also proposed for scaling‐up purposes.

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Amine functionalized sodium alginate hydrogel for efficient and rapid removal of methyl blue in water

Cited by 122 publications

References 72 publications

Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Carbon dots crosslinked chitosan/cellulose sponge capture of methyl blue by an adsorption process

Efficient removal of methyl orange by nanocomposite aerogel of polyethyleneimine andβ‐cyclodextringrafted cellulose nanocrystals

Kinetics of a fixed bed reactor with immobilized microorganisms for the removal of organic matter and phosphorous

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