Functionalization in copolymers based on 4VP:DVB for the removal of Cr(VI) ions from aqueous solution

Ortíz-Palacios, Jesús; Cardoso, J.; Cruz, Marcos de la; Anleu, Eloisa

doi:10.1002/app.45548

Cited by 10 publications

(1 citation statement)

References 40 publications

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“…As shown in Figure 1, through consulting literature, we discovered that by reacting divinylbenzene (DVB) with vinylpyridine (VP), a porous material containing pyridine ring can be easily constructed. [ 63,64 ] Both 4VP and 2VP can be used as nitrogen sources to synthesize materials containing pyridine rings. All of the catalysts possess a very similar porous beads architecture.…”

Section: Resultsmentioning

confidence: 99%

Constructing the single‐site of pyridine‐based organic compounds for acetylene hydrochlorination: From theory to experiment

Zhao

Xue

et al. 2021

Applied Organom Chemis

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Acetylene hydrochlorination reaction requires toxic mercuric chloride catalyst, which caused serious environmental pollution by mercury in recent years. Though Au‐based catalysts show the best catalytic activity and high rates of acetylene conversion, much work still needs to be done to reduce the cost before their large‐scale applications. Here, a pure pyridine‐based organic polymer was successfully designed and assembled, which contains only one nitrogen species and exhibits a high activity with acetylene conversion reaching 88% and the selectivity of vinyl chloride above 99%. Both experimental and density functional theory (DFT) studies directly demonstrate that the pyridinic N atom in pyridine ring is the active site of the catalyst and the insertion of acetylene to HCl might be the rate‐determining step. Different from traditional carbonization and aminating treatment at high temperature, the pyridine‐based polymers were obtained by polymerization in liquid phase. Besides, the activity of the catalyst may be determined by these combined effects of surface area, pores structure, and the amount of pyridinic N.

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Section: Resultsmentioning

confidence: 99%

Constructing the single‐site of pyridine‐based organic compounds for acetylene hydrochlorination: From theory to experiment

Zhao

Xue

et al. 2021

Applied Organom Chemis

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Lignocellulosic derivative and chitosan bioadsorbent: Synthesis, characterization, and performance in chromium adsorption

Neto

Pereira

Morandim-Giannetti

2020

J of Applied Polymer Sci

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Environmental pollution with heavy metals, especially with hexavalent chromium, is a serious problem worldwide. Therefore, in this study, the synthesis, characterization, and application of a heavy metal bioadsorbent, CMCCHDIC, were carried out. Carboxymethylcellulose (CMC) was synthesized from corn stover and reacted with chitosan (CH) using N,N′‐diisopropylcarbodiimide (DIC) as a coupling reagent to obtain CMCCHDIC. CMC and CMCCHDIC were characterized by granulometric distribution of microparticles, scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and nuclear magnetic resonance. The ideal conditions for CMCCHDIC adsorption were determined, and 180 min of contact time, pH 2.5, and 293 K were observed to yield the best adsorption capacity. An increase in the adsorption capacity of CMCQDIC (qe = 115.78 ± 0.17 mg∙g−1) to 81.5% relative to that of pure CH (qe = 63.78 ± 0.48 mg∙g−1) was observed, and the reduction of solubility in acidic media comparing with CH, which favors the application of the bioadsorbent synthetized.

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Functionalized chitosan with butylammonium ionic liquids for removal of Cr(VI) from aqueous solution

Eliodório

Pereira

Morandim-Giannetti

2020

J of Applied Polymer Sci

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Environmental pollution by heavy metals is currently a problem of great concern for human health. In this context, this study aims to contribute with the synthesis and characterization of chitosan functionalized with three different ionic liquids (n-butylammonium acetate, sec-butylammonium acetate, and tert-butylammonium acetate) followed by its application in hexavalent chromium effluent treatment. The adsorbents synthesized (ChN, ChS, and ChT) were characterized by SEM, EDS, FTIR, BET, RDD, PSD, and XRD techniques. Afterward, the influences of temperature, contact time, and pH on the Cr(VI) adsorption process were evaluated. The solution with pH 3 displayed the highest adsorption capacities (107.31, 104.60, and 107.97 mg.g-1 for ChN, ChS, and ChT, respectively). The kinetic data were better adjusted to the Weber-Morris kinetic model with an ideal time of 2 h. Furthermore, the influence of temperature was evaluated using the Freundlich and Langmuir isotherms, with maximum capacities of 142.05 (ChN), 131.58 (ChS), and 146.63 mg.g-1 (ChT). The adsorbent displayed enhanced adsorption properties in comparison with raw chitosan by an intensification of the electrostatic interaction between amino groups and hexavalent chromium. Finally, the reusability was investigated, and significant results were observed (84.33 ± 4.87%) in the adsorption process after 4 cycles.

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Functionalization in copolymers based on 4VP:DVB for the removal of Cr(VI) ions from aqueous solution

Cited by 10 publications

References 40 publications

Constructing the single‐site of pyridine‐based organic compounds for acetylene hydrochlorination: From theory to experiment

Constructing the single‐site of pyridine‐based organic compounds for acetylene hydrochlorination: From theory to experiment

Lignocellulosic derivative and chitosan bioadsorbent: Synthesis, characterization, and performance in chromium adsorption

Functionalized chitosan with butylammonium ionic liquids for removal of Cr(VI) from aqueous solution

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