Fabrication of starch-based high-performance adsorptive hydrogels using a novel effective pretreatment and adsorption for cationic methylene blue dye: Behavior and mechanism

Chen, Liwei; Zhu, Yunyan; Cui, Yuming; Dai, Rui; Zhi-hua, Shan; Chen, Hui

doi:10.1016/j.cej.2020.126953

Cited by 177 publications

(76 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The kinetic parameters were evaluated from Pseudo-first order (Equation (7)), Pseudo-second order (Equation (8)) and Elovich (Equation (9)) models [ 99 , 100 ]: q t = q e [1 − exp(−k 1 t)], q t = (q e 2 k 2 t)/(1 + k 2 q e t), q t = α + β ln t, where q t (mg/g) is the amount of dye adsorbed at time t (min) and q e (mg/g) is the amount of dye adsorbed at equilibrium. k 1 (min −1 ) and k 2 (min −1 ) are the Pseudo-first order and Pseudo-second order constants, respectively.…”

Section: Resultsmentioning

confidence: 99%

Adsorption Behavior of Crystal Violet and Congo Red Dyes on Heat-Treated Brazilian Palygorskite: Kinetic, Isothermal and Thermodynamic Studies

et al. 2021

View full text Add to dashboard Cite

The effect of heat treatment on the adsorptive capacity of a Brazilian palygorskite to remove the dyes crystal violet (CV) and congo red (CR) was investigated. The natural palygorskite was calcined at different temperatures (300, 500 and 700 °C) for 4 h. Changes in the palygorskite structure were evaluated using X-ray diffraction, X-ray fluorescence, thermogravimetric and differential thermal analysis, N2 adsorption/desorption and Fourier transform infrared spectroscopy. The adsorption efficiency of CV and CR was investigated through the effect of initial concentration, contact time, temperature, pH and dosage of adsorbent. The calcination increased the adsorption capacity of palygorskite, and the greatest adsorption capacity of CV and CR dyes occurred in the sample calcined at 700 °C (Pal-700T). The natural and calcined samples at 300 and 500 °C followed the Freundlich isothermal model, while the Pal-700T followed the Langmuir isothermal model. Adsorption kinetics results were well described by the Elovich model. Pal-700T showed better adsorption performance at basic pH, with removal greater than 98%, for both dyes. Pal-700T proved to be a great candidate for removing cationic and anionic dyes present in water.

show abstract

Section: Resultsmentioning

confidence: 99%

Adsorption Behavior of Crystal Violet and Congo Red Dyes on Heat-Treated Brazilian Palygorskite: Kinetic, Isothermal and Thermodynamic Studies

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Furthermore, the compatibility of the adsorption data with the pseudo‐second‐order kinetic model confirmed the presence and involvement of electrostatic interactions in the process of the adsorption of the dye molecules onto the biosorbent. It was concluded that RO16 dye adsorption by the C‐TPP‐PEE biosorbent was significantly affected by both the solution pH and functional groups on the biosorbent surface due to electrostatic attraction and hydrogen bonding 43, 44.…”

Section: Resultsmentioning

confidence: 99%

Removal of the Anionic Dye Reactive Orange 16 by Chitosan/Tripolyphosphate/Mushroom

Yıldırım

2021

Chem Eng & Technol

View full text Add to dashboard Cite

The green composite chitosan/tripolyphosphate/mushroom (C-TPP-PEE) was synthesized and evaluated for its adsorption performance of the dye Reactive Orange 16 (RO16), by using the batch technique. Fourier-transform infrared spectroscopy, thermogravimetric analysis, and field emission scanning electron microscopy were employed to characterize the C-TPP-PEE. The maximum adsorption capacity of the RO16 dye for batch adsorption was determined as 736 mg g -1 . The experimental kinetic data at equilibrium was found to be best fitted to the pseudo-second-order kinetic model. The results showed that the adsorption isotherm was best correlated to the Langmuir model. The thermodynamic data indicated that the adsorption process was spontaneous, favorable, and endothermic.

show abstract

“…In general, the impurities of the starting clays decreased either by the action of the thermal and hydrothermal treatments and/or by dilution effects after the addition of new components in the synthesis gel, such as alumina and NaOH [ 70 ]. However, the percentages of Na + increased significantly due to the incorporation of NaOH as a mineralizing agent in the synthesis of the zeolites [ 71 , 72 ]. This specific fact is due to the capture of Na + ions by the zeolitic structure, to neutralize the negative charge of aluminum in the zeolite and/or geopolymer when they have been formed [ 73 ].…”

Section: Discussionmentioning

confidence: 99%

“…pH affects the adsorbent surface charge, the electrical charge of the dye, and the degree of ionization, which control the adsorption process. It is expected that adsorption will increase with pH, particularly for an adsorbate with a cationic nature [ 71 ]. At pH values above pH PZC , the surface has a net negative charge and tends to accumulate cationic dye molecules due to the electrostatic attraction between the cationic dye molecule and the negatively charged extrudate surface, as suggested by other authors [ 85 ].…”

Section: Discussionmentioning

confidence: 99%

Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

et al. 2021

View full text Add to dashboard Cite

Adsorption is an effective method of removing harmful pollutants from air and water. In the present study, zeolites prepared by sol-gel method from two Ecuadorian clays were combined with precursor clays and the ZnTiO3/TiO2 semiconductor for adsorbing methylene blue (MB) as a water contaminant. The synthesized compounds were characterized using powder X-ray diffraction, X-ray fluorescence, scanning electron microscopy, energy dispersive X-ray, and surface area measurement. These compounds were combined to form cylindrical extrudates of 0.2 cm (diameter) and 1.0 cm (length). The adsorption characteristics of the composites were measured using batch sorption studies as a function of pH, initial concentration, and contact time. The pseudo-second-order model and the Langmuir isotherm model were better suited to the adsorption process. The equilibrium state was achieved around 180 min of adsorption, and a pH of 7 was established as the optimal operating condition. The maximum adsorption values of the dye were obtained with the composites derived from G-Clay, whose average adsorption capacity was 46.36 mg g−1, in contrast with composites derived from R-Clay, whose average adsorption value was 36.24 mg g−1. The results reflect that synthesized composites could be used potentially for the removal of cationic dye from wastewater.

show abstract

Fabrication of starch-based high-performance adsorptive hydrogels using a novel effective pretreatment and adsorption for cationic methylene blue dye: Behavior and mechanism

Cited by 177 publications

References 61 publications

Adsorption Behavior of Crystal Violet and Congo Red Dyes on Heat-Treated Brazilian Palygorskite: Kinetic, Isothermal and Thermodynamic Studies

Adsorption Behavior of Crystal Violet and Congo Red Dyes on Heat-Treated Brazilian Palygorskite: Kinetic, Isothermal and Thermodynamic Studies

Removal of the Anionic Dye Reactive Orange 16 by Chitosan/Tripolyphosphate/Mushroom

Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

Contact Info

Product

Resources

About