Preparation and properties of diatomite composite superabsorbent

Qi, Xiaohua; Liu, Mingzhu; Chen, Zhenbin; Liang, Rui

doi:10.1002/pat.847

Cited by 72 publications

(39 citation statements)

References 34 publications

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“…The energy released by different forces during adsorption is unequal [22,45] and the energy associated with the physical and chemical forces are van der Waals forces (4-10 kJ/mol), hydrophobic bond forces (5 kJ/mol), hydrogen bond forces (2-40 kJ/mol), coordination exchange (40 kJ/mol), dipole bond forces (2-29 kJ/mol), and chemical bond forces (>60 kJ/mol). In this study, the enthalpy change associated with amaranth adsorption onto ARP is 24.89 kJ/mol, suggesting that the all above mentioned forces were involved for adsorption of amaranth except coordination exchange and chemical bond forces.…”

Section: Thermodynamic Studiesmentioning

confidence: 99%

“…A wide variety of porous materials, such as agricultural waste [6], polymers [7][8][9], carbon materials [10][11][12], clay minerals [13][14][15][16], and other solid materials [5,[17][18][19][20] have been investigated as adsorbents for the removal of dyes. In recent years, polymeric composite adsorbents have been increasingly used to remove and recover dyes from waste streams due to their wide variations in porosity, surface chemistry, and higher thermal stability especially regenerability on site [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Amaranth Dye onto Alumina Reinforced Polystyrene

Ahmad

Kumar

2010

CLEAN Soil Air Water

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Adsorptive removal of toxic amaranth dye by alumina reinforced polystyrene (ARP) composite was studied as a function of contact time, pH, initial dye concentration, and temperature. The results indicated that adsorption was strongly dependent on pH and temperature of the dye solution. The adsorption was favored at low pH with the maximum removal at pH 2.0. Langmuir, Freundlich, Temkin, and DubininRadushkevich (D-R) models were used for the description of adsorption equilibrium data and the best interpretation for the experimental data was given by the D-R model. The adsorption kinetics was tested using pseudo first order, pseudo second order, Elovich, intraparticle, and film diffusion models and the removal by ARP followed a pseudo second order kinetics. Thermodynamic studies revealed that both adsorption and desorption was spontaneous and endothermic in nature. From the exhausted adsorbent, about 70 and 96% desorption was obtained with (99%) CH 3 OH and 0.1 M NaOH, respectively.

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Section: Thermodynamic Studiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption of Amaranth Dye onto Alumina Reinforced Polystyrene

Ahmad

Kumar

2010

CLEAN Soil Air Water

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“…The band in the region of 792 cm 21 was because of the Si-O-Al stretching mode. The peaks at 619 and 490 cm 21 were assigned to the Si-O-Al and Si-O-Si bending vibration, respectively [20]. There were no obvious changes in the KGAD with different contents of DT; therefore, a very broad band between 3700 and 3300 cm 21 was observed, the peak between 3600 and 3400 cm 21 was attributed to the OH stretching vibration of the carboxylic groups in KGA0, while the peak 3446 cm 21 in KGA0 was widened gradually and shifted to the higher wave number with the increase of the DT and the decrease of intensity.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Preparation and characterization of konjac glucomannan-acrylic acid-diatomite composites

Chen

Zhang

2015

Polym. Compos.

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A novel konjac glucomannan (KGM)‐acrylic acid‐diatomite composite (KGAD) was synthesized by the solution polymerization of partially neutralized acrylic acid (AA) on to KGM and diatomite (DT), using potassium persulfate as a free radical initiator, in the presence of Trimethylolpropane Trimethacrylate (TPTA) as a crosslinking agent. The structure and morphology of KGAD were characterized by using FT‐infrared, X‐ray diffraction, scanning electron microscopy. Besides, the thermal stability as well as the salt absorption of the composites was investigated by the thermogravimetric analysis and the swelling rate test, respectively. The results showed that the interactions between KGM‐AA (KGA0) and DT could be generated through hydrogen bond formation. Besides, the crystal of composites became rules and grew well with the addition of DT. It was also found that the appropriate amount of DT could be dispersed uniformly with a single crystal state in the matrix of KGA0 while excessive DT caused aggregation, inducing an irregular distribution in the matrix. In addition, the thermal stability of KGAD was improved based on the introduction of DT into the polymer network. POLYM. COMPOS., 37:3384–3390, 2016. © 2015 Society of Plastics Engineers

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“…The bands at 1080 cm -1 could be attributed to the stretching of the siloxane (-Si-O-Si-) group, and this was confirmed by the -Si-O-Si-bending vibration at 481 cm -1 . The band at 790 cm -1 was attributed to SiO-H vibration [23,24].…”

Section: Infrared Spectroscopic Analysismentioning

confidence: 99%

Optimization of synthetic conditions CMC-g-poly (acrylic acid)/Celite composite superabsorbent by Taguchi method and determination of its absorbency under load

Pourjavadi¹,

Amini‐Fazl²,

Ayyari³

2007

Express Polym. Lett.

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Abstract.A novel biopolymer-based composite hydrogel was synthesized through chemical crosslinking by graft copolymerization of partially neutralized acrylic acid onto the carboxymethyl cellulose (CMC). The Taguchi method, a robust experimental design, was employed for the optimization of the synthesis based on the swelling capacity of the hydrogels. This method was applied for the experiments and standard L16 orthogonal array with five factors and four levels. In the synthesis of the composite superabsorbent, N,N'-methylene bisacrylamide (MBA) as crosslinker, ammonium persulfate (APS) as initiator, acrylic acid (AA) as monomer, CMC/Celite weight ratio and neutralization percent (NU) were used as important factors. From the analysis of variance of the test results, the most effective factor controlling equilibrium swelling capacity was obtained and maximum water absorbency of the optimized final product was found to be 310 g/g. The surface morphology of the gel was examined using scanning electron microscopy. Furthermore in this research, swelling capacity of composite SAPs was determined under realistic condition (saline solution absorbency under load).

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Preparation and properties of diatomite composite superabsorbent

Cited by 72 publications

References 34 publications

Adsorption of Amaranth Dye onto Alumina Reinforced Polystyrene

Adsorption of Amaranth Dye onto Alumina Reinforced Polystyrene

Preparation and characterization of konjac glucomannan-acrylic acid-diatomite composites

Optimization of synthetic conditions CMC-g-poly (acrylic acid)/Celite composite superabsorbent by Taguchi method and determination of its absorbency under load

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