Design of amphoteric chitosan flocculants for phosphate and turbidity removal in wastewater

Agbovi, Henry K.; Wilson, Lee D.

doi:10.1016/j.carbpol.2018.02.024

Cited by 69 publications

(26 citation statements)

References 63 publications

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“…Particles that cause turbidity retained by the chitosan membrane through the micro purification process are suspected to be coagulated particles such as juice, wax, pulp, dust, and fiber (cellulose). This statement is in line with research conducted by Agbovi [44] and Zhang [45], which states that the value of water turbidity decreases along with the increasing amount of chitosan used as a filter. Chitosan used as a filter can bind impurities contained in the water.…”

Section: Coefficient Of Rejection (%)supporting

confidence: 91%

Purification of Sugarcane Juice (Saccharum officinarum L.) Using Chitosan Membrane with Dead-End Flow System

Hendrawan¹,

Diyaratnasari²,

Sutan³

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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The purification process of sugarcane juice in a sugar factory mostly uses sulphitation process, separating clear juice from dirty juice using a sedimentation system. Impurities on the processing of sugarcane juice will further cause difficulties, the formation of color, an increase in viscosity, and reducing sugar recovery. Membrane purification technology is offered to overcome these problems. This study aims to determine the effect of chitosan and acetic acid on the performance of chitosan membranes in the clearance of sugarcane juice and to find the best concentration of chitosan and acetic acid for the purification process of sugarcane juice. The filtration process was performed by using the chitosan membrane to process a clear sugarcane juice sample from the pretreatment result, which is assumed as clear juice product from sulphitation process in sugar factory. The results showed that (1) the result of pretreatment had the value from TSS (Total Soluble Solids) of 15.4%; turbidity of 82.33 NTU; and the ICUMSA (International Commission for Uniform Methods of Sugar Analysis) colour of 14970.02 IU. (2) After filtration using membrane, better quality of pretreatment clear sugarcane juice is obtained, characterized by increasing chitosan concentration at each acetic acid level, rejection value of TSS, turbidity, and ICUMSA colour. (3) The best treatment result based on Zeleny multiple attribute method is found in chitosan membrane with concentration of 4%, acetic acid concentration of 1.5% to inject TSS until reaching 12.64%, ICUMSA until reaching 9.89%, and rejection of turbidity until reaching 63.61%. Higher chitosan concentration caused small pore size of the membrane.

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Section: Coefficient Of Rejection (%)supporting

confidence: 91%

Purification of Sugarcane Juice (Saccharum officinarum L.) Using Chitosan Membrane with Dead-End Flow System

Hendrawan¹,

Diyaratnasari²,

Sutan³

et al. 2020

Int. J. Adv. Sci. Eng. Inf. Technol.

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“…In addition, CMC has many excellent features such as film formation, emulsification, suspension, water retention, and bonding properties. Therefore, it is the most preferred polymer for food, medicine, detergent, paint, paper, flocculant, sizing agent, textile, and other industries [6][7][8][9][10][11]. On the other hand, polyvinyl alcohol (PVA) is a synthetic water-soluble polymer with many applications including textile pulps, adhesives, coatings, dispersants, and a series of medical materials with medical functions owing to its excellent adhesion, flexibility, and film-forming properties [12,13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film

Zhu

Che³

et al. 2020

Polymers

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Polyvinyl alcohol (PVA)/carboxyl methyl cellulose sodium (CMC)/Na2CO3 composite films with different contents of Na2CO3 were prepared by blending and solution-casting. The effect of Na2CO3 on the microstructure of PVA/CMC composite film was analyzed by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and atomic force microscopy (AFM). Its macroscopic properties were analyzed by water sorption, solubility, and dielectric constant tests. The results show that the microstructure of PVA/CMC/Na2CO3 composite films was different from that of PVA and PVA/CMC composite films. In addition, compared to PVA and PVA/CMC composite films, the water sorption of PVA/CMC/Na2CO3 composite films relatively increased, the solubility in water significantly decreased, and the dielectric properties significantly improved. All these results indicate that the hydrogen bonding interaction between PVA and CMC increased and the crystallinity of PVA decreased after the addition of Na2CO3. This was also a direct factor leading to increased water sorption, decreased solubility, and enhanced dielectric properties. The reaction mechanism of PVA, CMC, and Na2CO3 is proposed to further evaluate the effect of Na2CO3 on the microstructure and macroscopic properties of PVA/CMC/Na2CO3 composite films.

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“…Water pollution by different contaminants from industrial activities remains a topic of major environmental concern [1]. Various techniques for the removal of contaminants include precipitation [2], ion exchange [3], filtration [4], solvent extraction [5], reverse osmosis [6], coagulation-flocculation [7,8], adsorption [9], and others. Among these approaches, adsorption-based techniques have been extensively studied as an efficient mode of contaminant removal from water, due to their low cost, process flexibility, easy handling and limited usage of secondary chemicals [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Surface-Modified Chitosan: An Adsorption Study of a “Tweezer-Like” Biopolymer with Fluorescein

Vafakish

Wilson

2019

Surfaces

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Tweezer-like adsorbents with enhanced surface area were synthesized by grafting aniline onto the amine sites of a chitosan biopolymer scaffold. The chemical structure and textural properties of the adsorbents were characterized by thermogravimetric analysis (TGA) and spectral methods, including Fourier transform infrared (FT-IR), nuclear magnetic resonance (1H- and, 13C-NMR) and scanning electron microscopy (SEM). Equilibrium solvent swelling results for the adsorbent materials provided evidence of a more apolar biopolymer surface upon grafting. Equilibrium uptake studies with fluorescein at ambient pH in aqueous media reveal a high monolayer adsorption capacity (Qm) of 61.8 mg·g−1, according to the Langmuir isotherm model. The kinetic adsorption profiles are described by the pseudo-first order kinetic model. 1D NMR and 2D-NOESY NMR spectra were used to confirm the role of π-π interactions between the adsorbent and adsorbate. Surface modification of the adsorbent using monomeric and dimeric cationic surfactants with long hydrocarbon chains altered the hydrophile-lipophile balance (HLB) of the adsorbent surface, which resulted in attenuated uptake of fluorescein by the chitosan molecular tweezers. This research contributes to a first example of the uptake properties for a tweezer-like chitosan adsorbent and the key role of weak cooperative interactions in controlled adsorption of a model anionic dye.

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Design of amphoteric chitosan flocculants for phosphate and turbidity removal in wastewater

Cited by 69 publications

References 63 publications

Purification of Sugarcane Juice (Saccharum officinarum L.) Using Chitosan Membrane with Dead-End Flow System

Purification of Sugarcane Juice (Saccharum officinarum L.) Using Chitosan Membrane with Dead-End Flow System

Effect of Na2CO3 on the Microstructure and Macroscopic Properties and Mechanism Analysis of PVA/CMC Composite Film

Surface-Modified Chitosan: An Adsorption Study of a “Tweezer-Like” Biopolymer with Fluorescein

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