Filtration and adsorption properties of porous calcium alginate membrane for methylene blue removal from water

Li, Qi; Li, Yanhui; Ma, Xiaomin; Du, Qiuju; Sui, Kunyan; Wang, Dechang; Wang, Cuiping; Li, Hongliang; Xia, Yanzhi

doi:10.1016/j.cej.2017.01.098

Cited by 246 publications

(89 citation statements)

References 39 publications

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“…Thus further increase in microsphere mass did not affect the removal rate, it may be controlled by the unavailability of adsorbate sites which could be saturated by the MB molecules [33,34]. As for the BF, at lower adsorbent dosage (< 10 g/L), there was a sharp increase in removal efficiency, which was because of more adsorption sites [33][34][35]. At higher adsorbent dosage (> 10 g/L), the adsorbent dosage had little effect on the removal of BF dyes.…”

Section: Microstructure Analysis Of Microspheresmentioning

confidence: 99%

“…The values of all the adsorption isotherm parameters of MB and BF are listed in Table 3. [33,35]. The maximum adsorption capacity of MB and BF was calculated 30.0120 and 24.1604 mg/g, respectively.…”

Section: Adsorption Isotherm and Mechanismmentioning

confidence: 99%

“…Figure 12 shows the adsorption isotherms of MB and BF of the microspheres. The selection of an isotherm model depends on the nature and type of the system [33,34]. Herein, the Langmuir model (Eq.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

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Synthesis of low-cost porous ceramic microspheres from waste gangue for dye adsorption

et al. 2017

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Low-cost porous ceramic microspheres from waste gangue were prepared by simple spray drying and subsequent calcination. Effects of calcination temperature on phase and microstructure evolution, specific surface area, pore structure, and dye adsorption mechanism of the microspheres were investigated systematically. Results showed that the microspheres were spherical, with some mesopores both on the surface and inside the spheres. The phase kept kaolinite after calcined at 800 and 900 and transformed into mullite at 1000 ℃ . The microspheres calcined at 800 ℃ showed ℃ larger adsorption capacity and removal efficiency than those calcined at higher temperatures. Methylene blue (MB) and basic fuchsin (BF) removal efficiency reached 100% and 99.9% with the microsphere dosage of 20 g/L, respectively, which was comparable to that of other low-cost waste adsorbents used to remove dyes in the literature. Adsorption kinetics data followed the pseudosecond-order kinetic model, and the isotherm data fit the Langmuir isotherm model. The adsorption process was attributed to multiple adsorption mechanisms including physical adsorption, hydrogen bonding, and electrostatic interactions between dyes and gangue microspheres. The low-cost porous microspheres with excellent cyclic regeneration properties are promising absorbent for dyes in wastewater filtration and adsorption treatment.

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Section: Microstructure Analysis Of Microspheresmentioning

confidence: 99%

Section: Adsorption Isotherm and Mechanismmentioning

confidence: 99%

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Synthesis of low-cost porous ceramic microspheres from waste gangue for dye adsorption

et al. 2017

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“…This dye pollutant has become a mojor source of contamination which is toxic and has detrimental effect on human health [1,2]. Moreover, the dyes pollutants were determinant hindering photosynthesis effects on ecosystem [3].…”

Section: Introductionmentioning

confidence: 99%

“…A linear anionic copolymer is comprised of α-L-guluronic acid and β-D-mannuronic acid. Alginate has been widely applied to the treatment of wastewater because of its biocompatibility, nontoxicity, high viscosity and lowcost relatively compared to other polymeric materials [2]. More importantly, alginate solution is used for cross-linking to make forming hydrogels (egg-box structure) of alginate beads by selective ionic interaction with the divalent metal such as Ca 2+ or Na + [21,22].Therefore, alginate and sericin were of interest to the researchers toward the properties and the composite material found to be adsorbent has been used for the treatment of a wide range of polluted wastewater [23].…”

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confidence: 99%

Adsorption of Basic and Acid Dyes Using Alginate/Sericin Composite Beads

Rangsanyutthana¹,

Jintakosol²,

Nitayaphat³

2018

Asian J. Chem.

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INTRODUCTIONSynthetic dyes such as cationic (all basic dyes) and anionic (direct, acid and reactive dyes) were found to be present in wastewater from industries such as textile, leather, paper, printing, plastic, cosmetics and other. This dye pollutant has become a mojor source of contamination which is toxic and has detrimental effect on human health [1,2]. Moreover, the dyes pollutants were determinant hindering photosynthesis effects on ecosystem [3]. As a result the removal of the dye from the wastewater is essential. The methods of dye removal from wastewater, include membrane filtration [4], coagulationflocculation [5], advanced oxidation process [6], biodegradation [7], adsorption process [8] and ion exchange [9].The adsorption process is considered to be very effective for the removal of dye from wastewaters. Activated carbons from natural wastes are a great adsorbent due to low-cost materials, waste materials and by-products [10,11]. However, there are many problems regarding the regeneration of the exhausted activated carbon [12]. Thus, an effort has been made to develop them by using adsorbent materials such as: polymers, clays [13] Alginate/sericin composite beads were prepared from a blend between sericin and alginate by the gelation process. The composite beads were used as the adsorbent for the removal of basic and acid dyes from an aqueous solution. The morphological structure of the beads was characterized by scanning electron microscopy (SEM). Adsorption experiments were conducted using contact time, concentration of sericin, pH and adsorbent dosage. The equilibrium adsorption data was achieved within 360 min at 5 % w/v of sericin. The Langmuir isotherm model showed the maximum monolayer adsorption capacity for basic dye (pH 8) and acid dye (pH 2) was 5.98 and 7.60 mg/g, respectively. The adsorption kinetics were described by the pseudo second-order model. The desorption experiment was demonstrated and repeated three times, all of which exhibited that it was regenerative and reusable. This study demonstrates that the alginate/sericin composite beads are effective adsorbent for the removal of dyes from aqueous solution.

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Robust, recoverable poly(N,N‐dimethylacrylamide)‐based hydrogels crosslinked by vinylated chitosan with recyclable adsorbability for acid red

Wang

Xing

Zhao

et al. 2019

J of Applied Polymer Sci

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To seek adsorptive hydrogels with high stability, poly(N,N-dimethylacrylamide) (PDMAM)-based hydrogels were fabricated employing vinylated chitosan as a macro-crosslinker. The prepared hydrogels achieves a maximum compressive stress above 11 MPa (98% strain), a maximum tensile strength, and fracture elongation of 0.037 MPa and 929%. The recovery ratios after three consecutive compressions (90% strain) and 1 h's resting (600% stretch) exceed 94% and 85%, respectively. The optimal adsorption effect (>90% removal efficiency) is achieved at pH 3 and 318 K in 2.5 h using hydrogels crosslinked by 9.77 wt % chitosan. The kinetic study indicates that the experimental data fit to the pseudo-second-order kinetic model better. The adsorption isotherm fits to the Freundlich model, indicating nonhomogeneous adsorption of the dyes on the hydrogels. Most adsorbed dyes are desorbed in 2 h at pH 10 and 318 K, both adsorption/desorption efficiencies exceed 90% after five adsorption-desorption cycles, confirming reusability of the hydrogels.Recently, hydrogels have attracted special attention for the adsorptive removal of pollutants in wastewater due to their unique physical and chemical characteristics and diversity. [23][24][25][26] Hydrogels are porous, three-dimensional (3D) polymeric networks that hold a large amount of water. The water absorbency mainly attributes to the numerous hydrophilic groups (e.g., hydroxyl, amino, carboxyl, amide, sulfo) existing in the network, which also contribute to the adsorptive removal of aqueous pollutants. 27 The pollutants can be adsorbed onto both the outer surface and inner network of the swollen, 3D hydrogels. The adsorption occurs mostly through Additional Supporting Information may be found in the online version of this article.

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Filtration and adsorption properties of porous calcium alginate membrane for methylene blue removal from water

Cited by 246 publications

References 39 publications

Synthesis of low-cost porous ceramic microspheres from waste gangue for dye adsorption

Synthesis of low-cost porous ceramic microspheres from waste gangue for dye adsorption

Adsorption of Basic and Acid Dyes Using Alginate/Sericin Composite Beads

Robust, recoverable poly(N,N‐dimethylacrylamide)‐based hydrogels crosslinked by vinylated chitosan with recyclable adsorbability for acid red

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