Cr(VI) and Cr(III) removal from aqueous solution by raw and modified lignocellulosic materials: A review

Equilibrio, termodinámica y modelos cinéticos en la adsorción de Rojo 40 sobre tuza de maíz

“…La TM es, por tanto, un subproducto agrícola renovable, disponible y de bajo costo, para el cual se han reportado capacidades de adsorción de colorantes y metales pesados tanto para el material nativo como para el modificado, que señalan su uso alternativo como potencial adsorbente [7,10].…”

Utilization of Modified Corn Silk as a Biosorbent for Solid-phase Extraction of Cr(III) and Chromium Speciation

“…[15][16][17] Biomaterials as sorbents for the adsorption of heavy metals have attracted extensive attention during the last few years. 1,[18][19][20] Various biomaterials, such as animalcule, 17 the root and leaf of plants, skin and shell of fruit, and agricultural waste, have been extensively explored due to their extensive availability and low cost. For example, brown seaweed, 21 coconut coir, 22-24 tea waste, 25 hazelnut shell, 26 Bael fruit shell, 27 ponkan mandarin peel 28 and a variety of agricultural waste 29,30 all show excellent adsorption performance for heavy metals.…”

Chemical Speciation of Chromium(III) and (VI) Using Phosphonium Cation Impregnated Polyurethane Foams Prior to Their Spectrometric Determination

“…The guideline values set by World Health Organization (WHO) for Cr(VI) in ground and drinking water is 0.05 mg L -1 for drinking water. 4,5 Thus, the developing of effective, precise and accurate analytical methods for preconcentration and chemical speciation of Cr(III) and Cr(VI) species at trace level is extremely important. 5 The two predominant forms of chromium in water i.e.…”

“…4,5 Thus, the developing of effective, precise and accurate analytical methods for preconcentration and chemical speciation of Cr(III) and Cr(VI) species at trace level is extremely important. 5 The two predominant forms of chromium in water i.e. Cr(III) and Cr(VI) have very different properties.…”

“…clay minerals, gelatin, biosorbent, and active carbon, synthetic polymers, C18-bonded silica, silica gel immobilized with Zr(IV) and Zr(VI) phosphate have been used for preconcentration and/or separation of trace and ultra trace amounts of toxic metal ions from complex matrices. [8][9][10][11][12][13][14][15] Determination and chemical speciation of Cr(III) and Cr(VI) at trace levels in welding fumes and in drinking water samples using strong anion ion-exchange, 16 neutral alumina, 17 mini-columns packed with resin immobilized with 8-hydroxyquinoline, 18 activated carbon, 19 leaching procedure with sodium carbonate 5 and drawn and modified lingo cellulosic materials 20,21 have been reported. However, some of these SPE methods [10][11][12][13][14][15] are too expensive or unselective; they require careful experimental conditions, are time consuming and are not compatible with the detection limit of Cr(VI) in various matrices.…”