Remediation of hexavalent chromium from aqueous solution using clay mineral Fe(II)–montmorillonite: Encompassing anion exclusion impact

Vinuth, M.; Naik, H.S. Bhojya; Manjanna, J.

doi:10.1016/j.apsusc.2015.09.167

Cited by 38 publications

(10 citation statements)

References 58 publications

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“…Cr(VI) has a strong carcinogenic and mutagenic effects. It is considered as an allergenic factor which has high permeability through biological membranes and ability to oxidize unsaturated bonds in fatty acids, nucleic acids, and proteins (Vinutha et al 2015;Hedberg et al 2014;Dhal et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Chromium(VI) reduction and accumulation on the kaolinite surface in the presence of cationic soil flocculant

et al. 2020

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Purpose Heavy metal soluble forms pose a threat to plants, soil microflora, and microfauna. To limit their toxicity and mobility, various immobilizing additives are being developed. The main aim of the study was to determine the influence of soil flocculant (cationic polyacrylamide (CtPAM)) on the hexavalent chromium ion reduction and accumulation on the kaolinite surface. In this way, the efficiency of the selected polymer conditioner in the soil remediation was determined. Materials and methods The adsorbed amounts of Cr(VI) and CtPAM on the kaolinite surface was determined spectrophotometrically (spectrophotometer UV/Vis) using specific indicators. The structure of electrical double layer formed on the kaolinite surface in the mixed system of cationic polyacrylamide and Cr(VI) ions was described based on the adsorptive measurements, zeta potential measurements, as well as potentiometric titration. The kaolinite aggregation in the presence of CtPAM and/or Cr(VI) ions was determined spectrophotometrically and proved using SEM microscopy. The reduction process of Cr(VI) to Cr(III) occurring in the adsorption layer was determined by diffuse reflectance spectroscopy (DRS). Results and discussion The obtained results indicated that cationic polyacrylamide contributes to Cr(VI) reduction to Cr(III) form in the kaolinite suspension. This heavy metal ions are strongly adsorbed by the applied clay mineral, especially at pH 5 (then the Cr(VI)-adsorbed amount equals 5.42 mg/g). The CtPAM addition favors the Cr(VI) ion immobilization on the kaolinite surface. In the conditioner presence, the heavy metal-adsorbed amount is even at 7.34 mg/g. The adsorption of CtPAM and chromium(VI) ions induces changes in the kaolinite surface charge density and electrokinetic potential. What is more, both substances favors the kaolinite aggregation. Conclusions Cationic polyacrylamide may be considered a substance reducing the toxicity of chromium(VI) ions in the natural environment and decreasing their availability for soil organisms. It can improve the soil structure (by stimulating aggregation) and reduce environment pollution with heavy metals simultaneously.

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Section: Introductionmentioning

confidence: 99%

Chromium(VI) reduction and accumulation on the kaolinite surface in the presence of cationic soil flocculant

et al. 2020

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“…3423 cm −1 and 1637 cm −1 are Mt interlayer adsorbed water and surface hydroxyl –OH bending vibrations, respectively. 14 There is Si–O tensile vibration at 1032 cm −1 , 11 Si–O–Al bending vibration, and Si–O–Si bending vibration at 518 cm −1 and 463 cm −1 , 11 respectively. The Si–O tensile vibration, Si–O–Al bending vibration, and Si–O–Si bending vibration of Fe 3 O 4 –Mt are weakened, and the Fe–O vibration peak at 568 cm −1 does not appear, indicating that there is an interaction between Si–O and Fe–O.…”

Section: Resultsmentioning

confidence: 99%

“…Commonly used methods to remove both pollutants include chemically, 7 the Fenton method, 8,9 and an adsorption method. 10,11 As it is operationally simple and easily adaptable, the adsorption method is the most commonly used removal method.…”

Section: Introductionmentioning

confidence: 99%

In situ growth of Fe₃O₄ on montmorillonite surface and its removal of anionic pollutants

Liu

et al. 2021

RSC Adv.

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“…The unique lamellar structure of clay mineral materials leads to special properties such as adsorption, plasticity, and ion exchange (Gołub and Piekutin, 2018; Pentyala et al., 2018; Xu et al., 2018). Various porous clay materials have been used to treat sewage including attapulgite, magnetic porous ceramsite, bentonite, clay mineral Fe(II)-montmorillonite, novel clay ceramic particles (Cheng et al., 2014; Han et al., 2019, 2013; Vinuth et al., 2015; Xu et al., 2019). Although using porous clay materials to treat sewage is very useful and effective, some of the widely utilized materials are expensive.…”

Section: Introductionmentioning

confidence: 99%

Application of a new type of Si–Al porous clay material as a solid phase support for immobilizing Acidovorax sp. PM3 to treat domestic sewage

Jiang

Wang

et al. 2019

Adsorption Science & Technology

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A novel Si–Al porous clay material W (reprocessed from ceramic waste) was used for Acidovorax sp. strain PM3 immobilization to promote the growth of strains and improve nitrogen and phosphorus removal performance in water treatment systems. The porous clay material W was characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy indicating that porous clay material W was a type of mullite with 63.52 m2/g specific surface area. After immobilization, the maximum biomass increased 2.7 times the specific growth rate and the removal rates of chemical oxygen demand (COD), ammonia (NH4+–N), and total phosphorus (TP) by the immobilized PM3 were 42.99, 29.19, and 11.76% higher than the free strain after 24 h. The Monod equation showed that the growth rate and processing speed of immobilized PM3 increased. The maximum adsorption capacities of COD and NH4+–N onto porous clay material W were 2.33 and 0.32 mg/g on the basis of Langmuir isotherm. The removal capacities of COD, NH4+–N, and TP by the immobilized PM3 were 588.24, 20.37, and 5.06 mg/l, respectively, as shown by kinetic studies. These results demonstrated that porous clay material W could improve the efficiency of microbial nitrogen and phosphorus removal, and the immobilized microorganism system could effectively treat domestic sewage. The adsorption isotherms can well describe the adsorption process. The maximum adsorption capacity of COD and NH4+–N on porous clay material W is 2.33 and 0.32 mg/g, respectively. Kinetic studies showed that the removal capacity of immobilized PM3 to COD, NH4+–N, and TP was 58.824, 20.37, and 5.06 mg/l, respectively.

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Remediation of hexavalent chromium from aqueous solution using clay mineral Fe(II)–montmorillonite: Encompassing anion exclusion impact

Cited by 38 publications

References 58 publications

Chromium(VI) reduction and accumulation on the kaolinite surface in the presence of cationic soil flocculant

Chromium(VI) reduction and accumulation on the kaolinite surface in the presence of cationic soil flocculant

In situ growth of Fe₃O₄ on montmorillonite surface and its removal of anionic pollutants

Application of a new type of Si–Al porous clay material as a solid phase support for immobilizing Acidovorax sp. PM3 to treat domestic sewage

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Remediation of hexavalent chromium from aqueous solution using clay mineral Fe(II)–montmorillonite: Encompassing anion exclusion impact

Cited by 38 publications

References 58 publications

Chromium(VI) reduction and accumulation on the kaolinite surface in the presence of cationic soil flocculant

Chromium(VI) reduction and accumulation on the kaolinite surface in the presence of cationic soil flocculant

In situ growth of Fe3O4 on montmorillonite surface and its removal of anionic pollutants

Application of a new type of Si–Al porous clay material as a solid phase support for immobilizing Acidovorax sp. PM3 to treat domestic sewage

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In situ growth of Fe₃O₄ on montmorillonite surface and its removal of anionic pollutants