Selective removal of mercury(II) from wastewater using polythioamides

Kagaya, Shigehiro; Miyazaki, Hiroyuki; Ito, Masahiro; Tohda, Koji; Kanbara, Takaki

doi:10.1016/j.jhazmat.2009.10.099

Cited by 65 publications

(31 citation statements)

References 16 publications

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“…e selectivity of 1 and 2 toward Pd, Au, and Ag is higher than conventional adsorbents having thiocarbonyl groups such as thioamide [26][27][28][29][30][46][47][48][49][50][51][52], thiourethane [32,34,36], and thiourea [11,25,[53][54][55][56][57][58][59] structure [61]. e lower selectivity of these thiocarbonyl structures can be ascribed to the tautomerism between thiocarbonyl and thiol.…”

Section: Metal Adsorption Experiments To Find the Metals Adsorbed By mentioning

confidence: 99%

“…Electrochemical processes require a troublesome procedure to scrape off the deposited metals on the electrode. Adsorbents bearing sulfur substituents are one of the most examined adsorption agents for noble metals owing to the excellent affinity of sulfur toward soft cations due to the soft Lewis basicity and the facileness of its introduction into various organic structures [30,[33][34][35][36][37]. Dithiocarbamic acids are the most popular sulfur adsorbents for heavy metals [38].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Hydrophilic Sulfur‐Containing Adsorbents for Noble Metals Having Thiocarbonyl Group Based on a Methacrylate Bearing Dithiocarbonate Moieties

Kinemuchi

Ochiai

2018

Advances in Materials Science and Engineering

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Novel hydrophilic sulfur-containing adsorbents for noble metals were prepared by the radical terpolymerization of a methacrylate bearing dithiocarbonate moieties (DTCMMA), hydrophilic monomers, and a cross-linker. e resulting adsorbents efficiently and selectively adsorbed noble metals (Au, Ag, and Pd) from various multielement aqueous solutions at room temperature owing to the thiocarbonyl group having high affinity toward noble metals. e metal adsorption by the adsorbents was proceeded by simple mixing followed by filtration.e noble metal selectivity of the adsorbent obtained from DTCMMA and N-isopropylacrylamide was higher than that of the adsorbent obtained from DTCMMA and N,N-dimethylacrylamide due to the lower nonspecific adsorption.

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Section: Metal Adsorption Experiments To Find the Metals Adsorbed By mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of Hydrophilic Sulfur‐Containing Adsorbents for Noble Metals Having Thiocarbonyl Group Based on a Methacrylate Bearing Dithiocarbonate Moieties

Kinemuchi

Ochiai

2018

Advances in Materials Science and Engineering

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“…[1][2][3][4][5][6] Also, there are various polymeric substances which can capture various ions, as a result of the complexation reactions. Such materials are chitosan, 7,8 polythioamide, 9 polypyrrole, 10 polyaniline, 11 etc. These polymers can be used either separately or as composites -the combination of different polymers 12,13,15 or combination of the polymer with some adsorbents.…”

Section: Introductionmentioning

confidence: 99%

Cu(II) ions removal from aqueous solution by synthesized Phragmites australis/emeraldine base biocomposite

Lavrova¹,

Velichkova²,

Koumanova³

2017

ECB

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The influence of in situ synthesized biocomposite consisted of Phragmites australis (Pha) -common reed and emeraldine base (Emb) on the removal of copper ion from aqueous media is discussed. The biocomposites were prepared with two different ratios of common reed/aniline (samples Pha/Emb1 and Pha/Emb2, respectively. Physicochemical parameters such as initial copper ion concentration, composite dosage and contact time between the composites and Cu(II) ions in aqueous solution were studied. An assessment of the equilibrium and the kinetics of sorption of copper ions has been made. Removal efficiency of 99.6 % was achieved with Pha/Emb1 and 91.9 % with Pha/Emb2, respectively. The experimental results were fitted to the isotherms of Langmuir, Freundlich, Temkin and DubininRadushkevich. It was established that the Langmuir isotherm is more suitable for the case of emeraldine base and for composite Pha/Emb1, while the Dubinin-Radushkevich isotherm is more suitable for the case of Pha/Emb2 (with higher content of common reed). The influence of the plant quantity in the biocomposite is important for the mechanism of Cu 2+ removal. Physical adsorption and ion exchange are dominant in the case of Pha/Emb1, and Emb, while in the case of Pha/Emb2 the chemical interaction is predominant. The kinetics of Cu(II) adsorption onto biocomposites followed pseudo-second-order model. IntroductionThe industrial wastewaters in most cases contain metal ions which can be removed by chemical or physicochemical processes. Because of their hazard impact on the environment and the high cost of the used methods, it needs to develop new, cost-effective and efficient methods for industrial wastewater treatment. The most widely used methods for metal ions removal from aqueous medium is precipitation, adsorption and ion exchange, because of their effectiveness, low cost and possibility of metal recovery.Increasing attention to the biosorbents such as rice hulls, raw pomegranate peel, peanut shells, sphagnum moss peat, tree fern, as well as dried activated sludge, is paid because they are widely spread, not expensive raw materials.1-6 Also, there are various polymeric substances which can capture various ions, as a result of the complexation reactions. Such materials are chitosan, 7,8 polythioamide, 9 polypyrrole, 10 polyaniline, 11 etc. These polymers can be used either separately or as composites -the combination of different polymers 12,13,15 or combination of the polymer with some adsorbents. [14][15][16] One of the widely used polymeric substance is polyaniline, which conductive properties and complexing ability are well-known. The polyaniline can be found in one of three idealized oxidation states -leucoemeraldine, emeraldine, and (per)nigraniline. The emeraldine form of polyaniline exists as emeraldine salt and emeraldine base. The deprotonated nonconducting emeraldine base has more free electron pairs in its structure in comparison with protonated conducting emeraldine salt, which contribute to its better complexation ability. 17-19The co...

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“…Mercury concentration was determined by the method known as cold vapor atomic absorption. This method is one of the most used for the analysis of mercury content in different types of samples such as soils, water or food (Kagaya et al, 2010;Tuzen et al, 2009;Voegborlo and Adimado, 2010). The process involves chemically reduction of the mercury in its elemental state using a strong reducing agent.…”

Section: Introductionmentioning

confidence: 99%

Determination of mercury distribution inside spent compact fluorescent lamps by atomic absorption spectrometry

Rey‐Raap

Gallardo

2012

Waste Management

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a b s t r a c tIn this study, spent compact fluorescent lamps were characterized to determine the distribution of mercury. The procedure used in this research allowed mercury to be extracted in the vapor phase, from the phosphor powder, and the glass matrix. Mercury concentration in the three phases was determined by the method known as cold vapor atomic absorption spectrometry. Median values obtained in the study showed that a compact fluorescent lamp contained 24.52 ± 0.4 ppb of mercury in the vapor phase, 204.16 ± 8.9 ppb of mercury in the phosphor powder, and 18.74 ± 0.5 ppb of mercury in the glass matrix. There are differences in mercury concentration between the lamps since the year of manufacture or the hours of operation affect both mercury content and its distribution. The 85.76% of the mercury introduced into a compact fluorescent lamp becomes a component of the phosphor powder, while more than 13.66% is diffused through the glass matrix. By washing and eliminating all phosphor powder attached to the glass surface it is possible to classified the glass as a non-hazardous waste.

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Selective removal of mercury(II) from wastewater using polythioamides

Cited by 65 publications

References 16 publications

Synthesis of Hydrophilic Sulfur‐Containing Adsorbents for Noble Metals Having Thiocarbonyl Group Based on a Methacrylate Bearing Dithiocarbonate Moieties

Synthesis of Hydrophilic Sulfur‐Containing Adsorbents for Noble Metals Having Thiocarbonyl Group Based on a Methacrylate Bearing Dithiocarbonate Moieties

Cu(II) ions removal from aqueous solution by synthesized Phragmites australis/emeraldine base biocomposite

Determination of mercury distribution inside spent compact fluorescent lamps by atomic absorption spectrometry

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