Fabrication of chitosan microspheres for efficient adsorption of methyl orange

Zhai, Linlin; Bai, Zhishan; Zhu, Yong; Wang, Bingjie; Luo, Wenqiang

doi:10.1016/j.cjche.2017.08.015

Cited by 151 publications

(47 citation statements)

References 43 publications

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“…MO (pKa = 3.45) presents the following colors according to the pH, red (pH <3.1), orange (3.1 <pH <4.4) and yellow (pH> 4.4) (ZHAI et al, 2018). In its turn, MV presents green (pKa = 1.15 and pH ≤ 1), blue (pKa = 2 and pH ≈ 2) and violet (pH ≈ 7) colors(ADAMS; ROSENSTBIN, 1914).…”

Section: Conditions Of Analysismentioning

confidence: 99%

Development of a Method to Evaluate the Efficiency of Nanoscale Zero-Valent Iron (Nzvi) to Degrade Pollutants

et al. 2019

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Iron nanoparticles (nZVI) stand out in environmental remediation due to their high reactivity. However, they have low chemical stability when exposed to oxygen and water, reducing their effectiveness. The objective of this work was to develop and validate a method to evaluate the efficiency of nZVI from synthetic lots L01 and L02, from the degradation of dyes, orange and methyl violet (MO and MV). The previous degradation tests provided the best results for MO (~100% degradation, 12 min reaction, 0.5 g L-1 dose). The optimization using Factorial Planning obtained the optimal condition, CMO = 5.98 mol L-1 and DnZVI = 0.56 g L-1. The Boltzmann model fitted the results obtained (R2 = 0.993). Finally, a mathematical relationship was obtained that provided equivalent doses of L01 and L02 in relation to the Standard. The applied mathematical adjustments presented R²> 0.99 and errors <4%.

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Section: Conditions Of Analysismentioning

confidence: 99%

Development of a Method to Evaluate the Efficiency of Nanoscale Zero-Valent Iron (Nzvi) to Degrade Pollutants

et al. 2019

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“…Among them, the adsorption method attracted extensive attention due to its advantages, such as easy operation, low cost, high efficiency, no secondary pollution, and easy industrialization [11]. Although some natural adsorbents and synthetic adsorbents showed a certain adsorption capacity for dyes [12][13][14][15][16][17][18], some drawbacks including low adsorption capacity, poor selectivity, and poor reusability still exist. Therefore, it is urgent to develop a novel adsorbent for the removal of MO from aquatic environments.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Polyaniline/Emulsion Microsphere Composite for Efficient Adsorption of Organic Dyes

Liu

Song

et al. 2020

Polymers

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Surface-functionalized polymeric microspheres have wide applications in various areas. Herein, monodisperse poly(styrene–methyl methacrylate–acrylic acid) (PSMA) microspheres were prepared via emulsion polymerization. Polyaniline (PANI) was then coated on the PSMA surface via in situ polymerization, and a three-dimensional (3D) structured reticulate PANI/PSMA composite was, thus, obtained. The adsorption performance of the composite for organic dyes under different circumstances and the adsorption mechanism were studied. The obtained PANI/PSMA composite exhibited a high adsorption rate and adsorption capacity, as well as good adsorption selectivity toward methyl orange (MO). The adsorption process followed pseudo-second-order kinetics and the Langmuir isotherm. The maximum adsorption capacity for MO was 147.93 mg/g. After five cycles of adsorption–desorption, the removal rate remained higher than 90%, which indicated that the adsorbent has great recyclability. The adsorbent materials presented herein would be highly valuable for the removal of organic dyes from wastewater.

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“…The alteration of natural polymers is an effective technique for the manufacturing of new materials to present extraordinary properties and amplify the field of the plausible uses of those large existing biopolymers [29]. Different strategies have been utilized either to change characteristic chitosan physically or artificially to boost up the sorption limit [30]. In earlier studies, it has been confirmed that the available functional amino hydroxyl entities at the second and sixth carbon locations empower an assortment of chemical alterations [31].…”

Section: Introductionmentioning

confidence: 99%

Engineering Functionalized Chitosan-Based Sorbent Material: Characterization and Sorption of Toxic Elements

et al. 2019

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The present study reports the engineering of functionalized chitosan (CH)-based biosorbent material. Herein, a two-step reaction was performed to chemically modify the CH using 1,4-bis(3-aminopropyl) piperazine to incorporate nitrogen basic centers for cations sorption from the aqueous environment. The resultant functionalized chitosan-based sorbent material was designated as CH-ANP and characterized using various analytical techniques, including elemental analysis, Fourier-transform infrared spectroscopy (FTIR), 13C NMR (in solid-state), X-ray diffraction, and thermal analysis. Then, the newly engineered CH-ANP was employed for the removal of copper, lead, and cadmium in the aqueous medium. Langmuir sorption isotherm analysis revealed that the highest sorption abilities achieved were 2.82, 1.96, and 1.60 mmol g−1 for copper, cadmium, and lead, respectively. Linear and nonlinear regression methods were deployed on the sorption data to study the behavior of the Langmuir, the Freundlich, and the Temkin sorption isotherms. Among the four different forms, the Langmuir isotherm type 1 fit well to the experimental data as compared to the other models. It also showed the lowest values of error, and a higher correlation coefficient than the Freundlich and Temkin models; thus it was the best fit with the experimental data compared to the latter two models. In conclusion, the findings suggest that chemically modified novel materials with enhanced Lewis basic centers are useful and promising candidates for the sorption of various toxic cations in aqueous solution.

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Fabrication of chitosan microspheres for efficient adsorption of methyl orange

Cited by 151 publications

References 43 publications

Development of a Method to Evaluate the Efficiency of Nanoscale Zero-Valent Iron (Nzvi) to Degrade Pollutants

Development of a Method to Evaluate the Efficiency of Nanoscale Zero-Valent Iron (Nzvi) to Degrade Pollutants

Preparation of Polyaniline/Emulsion Microsphere Composite for Efficient Adsorption of Organic Dyes

Engineering Functionalized Chitosan-Based Sorbent Material: Characterization and Sorption of Toxic Elements

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