Adsorption of Cu(II), Cd(II) and Cr(III) ions from aqueous solutions on humic acid modified Ca-montmorillonite

Wu, Pingxiao; Zhang, Qian; Dai, Yaping; Zhu, Nengwu; Dang, Zhi; Li, Ping; Wu, Jinhua; Wang, Xiangde

doi:10.1016/j.geoderma.2011.06.012

Cited by 133 publications

(57 citation statements)

References 27 publications

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“…5C and Electronic Annex E. A.T3), suggesting that redox reactions had the same impact on Cr and V and that the difference in their behavior below 10 cm in depth might be due to other processes, such as preferential precipitation. The oxidized form of Cr is more soluble and more mobile than the reduced form and is stabilized by OC in soil solutions (Kotaś and Stasicka, 2000;Wu et al, 2011). The dynamics of Cr between soil and soil solutions is governed by the presence of Fe and OC (Shaheen et al, 2014).…”

Section: Evolution Of Trace Elements (Pb V and Cr)mentioning

confidence: 99%

“…The composition of soil solutions can be affected by various processes such as adsorption of metals on soil organic matter or clays, which delays migration until desorption (Bradl, 2004;Sipos et al, 2005;Meng et al, 2009;Wu et al, 2011;Filella and Williams, 2012). The seasonal alternation of wet and dry cycles changes the redox conditions of soil and soil solutions, affecting the mobility of their components due to differing solubilities of, e.g., Fe, Cu, Cr, and Mn (Fuss et al, 2011;Miller et al, 2012;Fulda et al, 2013;Shaheen et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Factors controlling the chemical composition of colloidal and dissolved fractions in soil solutions and the mobility of trace elements in soils

Gangloff

Stille

Schmitt

et al. 2016

Geochimica et Cosmochimica Acta

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Section: Evolution Of Trace Elements (Pb V and Cr)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Factors controlling the chemical composition of colloidal and dissolved fractions in soil solutions and the mobility of trace elements in soils

Gangloff

Stille

Schmitt

et al. 2016

Geochimica et Cosmochimica Acta

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“…They found that the addition of humic acid before and after Cd changed the Cd adsorption performance differently. Some studies reported that adsorption capacities of the clays modified with humic acids increased [20], [21]. Adsorption of Cu, Cd and Cr onto Ca-montmorillonite modified with humic acid is higher than non-modified clay, as humic acid changes the adsorption sites onto the surface and so changing the adsorption mechanism and increasing the capacity [20].…”

Section: B Another Role Of Humic Acid In Adsorptionmentioning

confidence: 99%

Environmental Dilemma of Humic Substances: Being Adsorbents and Being Carcinogens

Yel¹,

Ahmetli²

2015

IJESD

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Abstract-Humic materials can be classified as soluble in high pH, soluble in all pH's, and insoluble in all pH's (IHA). In this study, humic substances in the environment were discussed, and their different environmental contributions, either positive or negative, were investigated. Some humic substances help the water treatment while some others cause carcinogenic matter accumulation in water. This dilemma was discussed with different examples. In the first part of this study, IHA was used as adsorbent in removal of some metals, chemical oxygen demand (COD) and color from water. The results were presented together with literature results. IHA could adsorb various heavy metals in 10 to 300 mg/g capacity interval, while COD removal performance was 2270 mg/g. In the second part of the study, soluble humic matter in natural waters and disinfection by-products (DBP) formation upon chlorination of such waters were discussed. Humic fractions were important precusors of DBP's such as trihalomethanes (THMs) and haloacetic acids (HAAs). Depending on the water resource, the humic substances, THM and HAA formation potentials and types and quantities of the compounds may differ, but all are bioaccumulative and potentially carcinogenic. The study investigated the two different faces of humic substances in the environment.

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“…[20,21] Due to their highly specific surface area, high cationic exchange capacity (CEC), and high abundance and resulting low price, clay minerals can be used as effective, environmentally friendly adsorbents for metal ions. The adsorption capacity and character of the clay minerals have been modified by treatment with sulfuric acid [22] and humic acid, [23] as well as by immobilization of anionic [24] and cationic [25,26] surfactants. Replacement of natural exchangeable cations with cationic surfactant makes the clay mineral surface more hydrophobic.…”

Section: Introductionmentioning

confidence: 99%

Modified Bentonite with Dithizone as Nano Clay Mineral Adsorbent for Solid Phase Extraction of Silver Ions

Shakerian¹,

Dadfarnia²,

Shabani³

et al. 2016

Croat. Chem. Acta

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Abstract:In this work, a simple flow injection system incorporating a microcolumn of immobilized dithizone on bentonite coated with cetyltrimethylammonium bromide was combined with flame atomic absorption spectrometry (FAAS) for on-line separation/preconcentration and determination of trace amounts of silver in water. Dithizone was physically immobilized on the surfactant coated bentonite particles and was used as the adsorbent in the preparation of microcolumn. Silver ions were deposited by processing a standard or sample solution of analyte in the pH range of 3-9 through the microcolumn. Injection of 250 µL of thiourea (0.4 mol L −1 , pH = 5.0) served to elute the retained species to the FAAS. The capacity of the adsorbent under working conditions was found to be 7.2 mg of silver per gram of adsorbent. Processing a water sample volume of 30 mL resulted in an enrichment factor of 116. The method was successfully applied to the determination of silver in different natural waters and a certified reference material.

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Adsorption of Cu(II), Cd(II) and Cr(III) ions from aqueous solutions on humic acid modified Ca-montmorillonite

Cited by 133 publications

References 27 publications

Factors controlling the chemical composition of colloidal and dissolved fractions in soil solutions and the mobility of trace elements in soils

Factors controlling the chemical composition of colloidal and dissolved fractions in soil solutions and the mobility of trace elements in soils

Environmental Dilemma of Humic Substances: Being Adsorbents and Being Carcinogens

Modified Bentonite with Dithizone as Nano Clay Mineral Adsorbent for Solid Phase Extraction of Silver Ions

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