Preparation and characterization of magnetic chitosan-modified diatomite for the removal of gallic acid and caffeic acid from sugar solution

Song, Xiaorong; Chai, Zhihui; Zhu, Yuan; Li, Chenglin; Liang, Xin

doi:10.1016/j.carbpol.2019.04.043

Cited by 59 publications

(23 citation statements)

References 45 publications

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“…The diffraction broad-bands observed in range of 18-32 • may be attributed to the amorphous SiO 2 [53]. Comparing Figure 7b,c, the crystalline characteristic peak intensity of both Dt is much reduced, the characteristic diffraction peaks of cristobalite is almost disappeared, and the characteristic diffraction peak of CS (2θ = 19.92 • ) appears, which indicated that CS and Dt have formed a good interface attachment effect [39]. Figure 7d shows that the peak position of CS remains a constant except that the intensity of characteristic diffraction peak is slightly increased, indicating that the structure of CS-modified Dt has a certain stability, and the diffraction peak of arsenic-bearing substances appears, indicating that the CS has a certain adsorption effect on arsenic.…”

Section: Int J Environ Res Public Health 2020 17 429 7 Of 14mentioning

confidence: 76%

“…The adsorption capacities of the two curves presented in the diagram were not equal to 0 in the extremely low-pressure range (P/P 0 < 0.01), and the increase of pressure promoted the adsorption capacity of CS-modified Dt to a greater degree than that of Dt. This outcome showed that both of them had micropore structures [39], and those of CS-modified Dt were more abundant because of modification that had occurred. As can be seen in Table 1, the average pore diameter of raw Dt and CS-modified Dt were 9.998 nm and 5.185 nm, respectively.…”

Section: Bet Analysismentioning

confidence: 92%

“…The hysteresis of raw Dt and CS-modified Dt at a relative pressure (P/P0) of 0.45-1 and 0.43-1, respectively, indicated that both samples had mesoporous properties [40]. The hysteretic loop of the type H3 in CS-modified Dt was more prominent, which might be due to the irregular slit pore formed on the surface of CS-modified Dt by the bulk heap formed by schistose CS [39].…”

Section: Bet Analysismentioning

confidence: 98%

“…However, a negative potential was observed at pH > 6.78. Hence, CS-modified Dt was a modified adsorbent that had the potential to adsorb anions in acidic environment and cations in the alkaline condition [39].…”

Section: Zeta Analysismentioning

confidence: 99%

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Adsorption of As(V) from Aqueous Solution on Chitosan-Modified Diatomite

Yang

Gong

Huang

et al. 2020

IJERPH

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A novel chitosan (CS)-modified diatomite (Dt) was prepared by a simple mixture in the mass ratio to remove As(V) from aqueous solution in this research. The CS-modified Dt adsorbent was characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray powder diffraction (XRD) analysis. The parameters to influence the adsorption of As(V) ion were studied under such conditions as kinetics, adsorption isotherm, and pH effect. The results revealed that adsorption of As(V) was initially rapid and the equilibrium time was reached after 40 min. The optimal value of the pH was 5.0 for better adsorption. The equilibrium data were well fitted to the Langmuir isotherm compared to the Freundlich isotherm, and exhibited the highest capacity and removal efficiency of 94.3% under an initial As(V) concentration of 5 mg/L. The kinetic data were well described by the pseudo-second-order model. In addition, 0.1 M NaOH has the best desorption efficiency of As(V) adsorbed on CS-modified Dt, and the removal efficiency of As(V) was still higher than 90% when after six adsorption-desorption cycles. These results showed that the CS-modified Dt could be considered as a potential adsorbent for the removal of As(V) in aqueous solution.

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Section: Int J Environ Res Public Health 2020 17 429 7 Of 14mentioning

confidence: 76%

Section: Bet Analysismentioning

confidence: 92%

Section: Bet Analysismentioning

confidence: 98%

Section: Zeta Analysismentioning

confidence: 99%

See 2 more Smart Citations

Adsorption of As(V) from Aqueous Solution on Chitosan-Modified Diatomite

Yang

Gong

Huang

et al. 2020

IJERPH

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“…It can be seen from Figure 3a that the removal efficiency of GA increases with an increase of solution pH and resin dosage. The high pH is helpful for the removal of GA, a fact that could be explained by the formation of anion-led GA exchange with chloride occurring on the active sites of MIEX resin [48]. The more MIEX resin particles supply, the more available active sites, thus promoting GA removal [5].…”

Section: Optimal Adsorption Parameters and Confirmation Experimentsmentioning

confidence: 99%

Process Parameters Optimization of Gallic Acid Removal from Water by MIEX Resin Based on Response Surface Methodology

et al. 2020

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In this work, the response surface methodology was used to optimize the process parameters of gallic acid adsorption on magnetic ion exchange (MIEX) resin. Based on Box-Behnken Design, a quadratic polynomial model equation including solution pH, gallic acid concentration, MIEX resin dosage and adsorption time was established. The reliability of the established regression equation was tested by variance analysis. Based on the regression equation, the technical parameters for gallic acid adsorption on MIEX resin were optimized and the effects of interaction between variables on the removal of gallic acid were analyzed. The results showed that the established regression equation was reliable and could effectively predict the removal of gallic acid. The optimal technical parameters were determined to be a pH of 9.17, a gallic acid concentration of 8.07 mg/L, a resin dosage of 0.98 mL/L and an adsorption time of 46.43 min. The removal efficiency of gallic acid was 97.93% under the optimal parameters. The interaction between pH and adsorption time had the most significant effect on the removal of gallic acid. The results of this study demonstrated that MIEX resin can remove gallic acid efficiently and relatively quickly under the condition of optimal technical parameters.

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Preparation and application of magnetic chitosan in environmental remediation and other fields: A review

Shaumbwa

Liu

Archer

et al. 2021

J of Applied Polymer Sci

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Magnetic chitosan has received considerable attention over the decades due to its low cost, biodegradability, green sources, magnetic intensity. In this review, we reviewed the preparation methods of magnetic chitosan using co-precipitation, cross-linking and electrochemical. Therein cross-linking methodologies involved in the reaction of amino groups are facile to introduce additional reaction groups and improve anti-swelling of chitosan layers, mostly in an acidic environment. Besides, we focused on the applications of magnetic chitosan in various fields such as wastewater treatment, for example, removal of heavy metal ions, organic/inorganic dyes, fluorides, and pesticides. Moreover, magnetic chitosan also reveals great potential application in the field of medical, pharmaceutical, food and electronic screening. Above all, magnetic chitosan is economically and operationally beneficial as it can be easily separated and controlled with an external magnetic field and can be modified to maximize its functions.

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Preparation and characterization of magnetic chitosan-modified diatomite for the removal of gallic acid and caffeic acid from sugar solution

Cited by 59 publications

References 45 publications

Adsorption of As(V) from Aqueous Solution on Chitosan-Modified Diatomite

Adsorption of As(V) from Aqueous Solution on Chitosan-Modified Diatomite

Process Parameters Optimization of Gallic Acid Removal from Water by MIEX Resin Based on Response Surface Methodology

Preparation and application of magnetic chitosan in environmental remediation and other fields: A review

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