Effective adsorption of antimony(III) from aqueous solutions by polyamide-graphene composite as a novel adsorbent
TL;DR: In this paper, the adsorption efficiency of the polyamide-graphene (PAG) was evaluated under the effects of concentration, temperature, contact time, medium pH, and reusability.
About: This article is published in Chemical Engineering Journal.The article was published on 2017-01-01. It has received 329 citations till now. The article focuses on the topics: Adsorption & Interfacial polymerization.
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TL;DR: In this paper, an overview of the versatile polymer-based composites containing different functional organic and/or inorganic counterparts for the removal of hazardous metal ions from wastewater is presented. And the future perspectives and trends in this field are also outlined.
386 citations
TL;DR: In this paper, the polyethyleneimine modified activated carbon/Fe (PAF) was used as an effective magnetic adsorbent to remove uranium (U(VI)) ions from aqueous solution as a function of batch adsorption parameters.
Abstract: In this study, the polyethyleneimine modified activated carbon/Fe (PAF) was prepared and used as an effective magnetic adsorbent to remove uranium (U(VI)) ions from aqueous solution as a function of batch adsorption parameters. The developed magnetic adsorbent was investigated by FT-IR, SEM, EDX, TG/DSC and BET techniques. The effects of the adsorption parameters on the sorption amount were investigated by using factorial design. In order to study the sorption behavior for U(VI) ions, the Langmuir, and Freundlich isotherm models were applied to fit the equilibrium data. The monolayer adsorption capacity of the magnetic sorbent for U(VI) was determined to be 115.31 mg g−1 at pH 5, 20 °C and 60 min. The kinetic results indicated that the pseudo-second-order kinetic modeling fits the equilibrium data well under employed temperature conditions. The thermodynamic examinations showed exothermic and spontaneous adsorption process. The reusability-cycling test indicated that the magnetic sorbent has good desorption performance. It was also concluded that the PAF magnetic material can be used as an effective adsorbent for the removal of U(VI) ions from wastewaters by taking into account its advantages such as being of cost effective, easy prepare and environmental friendly.
254 citations
TL;DR: The 3D g-C3N4/TiO2 heterojunction photocatalyst with separation free can facilitate the potential application in the treatment of water pollution.
231 citations
Cites methods from "Effective adsorption of antimony(II..."
...Up to now, the primary methods for water pollution treatment include adsorption [3,4], photocatalytic degrada-...
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TL;DR: In this paper, three composites for the simultaneous desulfurization of thiophene, benzothiophene (BT), and dibenzothiophen (DBT) in a model fuel were investigated.
227 citations
TL;DR: In this article, a two-step process was used to construct a GO-COOH/UiO-66 composites for the removal of radioactive uranium (U(VI) from seawater.
Abstract: Extraction of radioactive uranium (U(VI)) from seawater has recently received extensive attention in the nuclear energy field. In this study, to acquire more void space of an MOF as active points for improving adsorption capacity, GO–COOH/UiO-66 composites were designed via coordination of the carboxyl groups of GO with zirconium ion of UiO-66; this was included as a part of the rapid and effective two-step method. Transmission electron microscopy (TEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) were used to determine the effectiveness of the synthesis of GO–COOH/UiO-66 composites. The GO–COOH/UiO-66 composites were investigated for adsorption of U(VI) from an aqueous solution and artificial seawater. The results showed that the GO–COOH/UiO-66 composites had a high adsorption capacity at a suitable seawater pH with a high removal rate of U(VI) at the ppb and ppm levels. The adsorption process closely fitted the Langmuir isotherm model and pseudo-second-order rate equation. Based on the FTIR spectroscopy, the change in pH before and after the adsorption of U(VI), and X-ray photoelectron spectroscopy (XPS), a possible sorption mechanism of U(VI) onto GO–COOH/UiO-66 composites was revealed. In addition, the adsorbent showed good chemical stability under the operating conditions for the adsorption–desorption of U(VI) from an aqueous solution, which indicated a promising potential for applications in the extraction of U(VI) in seawater.
224 citations
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TL;DR: In this article, the absorption index at the wave length of the band maximum was found to be proportional to the total concentration of metal at shorter wave lengths, however, deviations were observed, the absorption increasing more rapidly with concentration than Beers' law would demand.
Abstract: solutions investigated, the absorption index diminishing approximately 1% for a rise in temperature of one degree. 6. In liquid ammonia rough measurements of concentration showed the absorption index to be proportional to the total concentration of metal. 7. In methylamine the absorption index, at the wave length of the band maximum is also proportional to the total concentration of metal. At shorter wave lengths, however, deviations were observed, the absorption increasing more rapidly with concentration than Beers’ law would demand. The ratio of the absorption index a t 650pp to that a t 53opp increases not only with increasing concentration of the metal but also with increasing concentration of the reaction product of the metal with methylamine, and probably also with increasing temperature. 8. These observations can be accounted for by the following hypotheses: The color in all cases is due to electrons combined with the solvent. In ammonia the dissociation of the metal into electrons is nearly complete, and the concentration of electrons uncombine4 with solvent is negligible compared with that of the solvated electrons. In other words, the solvation of the electrons is nearly complete. In methylamine, on the other hand, the concentration of un-ionized metal is no longer negligible and is responsible for the increased absorption a t the shorter wave lengths. The solvation of the electrons in methylamine is incomplete and diminishes as the temperature is increased.
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TL;DR: In this paper, a literature review of the use of sorbents and biosorbents to treat polluted aqueous effluents containing dyes:organics or metal ions has been conducted.
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