Effective adsorption of Cr (VI) from aqueous solution using natural Akadama clay

Zhao, Yingxin; Yang, Shengjiong; Ding, Dahu; Chen, Jie; Yang, Yingnan; Lei, Zhongfang; Feng, Chuanping; Zhang, Zhenya

doi:10.1016/j.jcis.2012.12.054

Cited by 102 publications

(46 citation statements)

References 45 publications

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“…Thus the Freundlich isotherm gave a better fit to the data than Langmuir and DubininRadushkevich isotherm models for Cr (IV) ions. Also as given in Table 2 (17), but differed from many other studies. For example, when magnetic natural zeolite-polymer composite and Turkish montmorillonite clay were used for Cr (VI) adsorption, it was found that the Langmuir isotherm fitted better than Freundlich model (1, 3).…”

Section: Isotherm Studiesmentioning

confidence: 75%

“…Similar results were found with the adsorption of Cr (VI) ions on natural Akadama clay and micro-vesicular volcanic. In these studies the maximum removal of Cr (VI) were exhibited at 40 and 100 g/ L of the mentioned adsorbent, respectively (17,19).…”

Section: Characterization Of Fire Claymentioning

confidence: 86%

“…Based on Figure 5 and Table 1, it is observed that the correlation coefficients (R 2 ) of pseudofirst-order model was 0.98, which was better than that of pseudo-second-order model, indicating that the pseudofirst-order equation fitted very well to the adsorption process. Nevertheless, a different phenomenon was observed in Cr (VI) adsorption by the modified wheat residue, micro-vesicular volcanic rocks and natural Akadama clay (14,17,19).…”

Section: Effect Of Contact Time and Kineticsmentioning

confidence: 91%

See 2 more Smart Citations

Hexavalent Chromium Adsorption onto Fire Clay

Rahmani¹,

Foroughi²,

Noorimotlagh³

et al. 2016

Avicenna J Environ Health Eng

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Cr (VI) as an extremely soluble and highly toxic ion is present in effluents of industries and imposes severe health-related problems. The current study aimed to provide information on Cr (VI) adsorption potential of fire clay as an abundant, cost-effective and untried material. Batch adsorption trials of Cr (VI) were performed to investigate the effects of pH, contact time, initial metal ion concentration and the adsorbent dosage. Langmuir, Freundlich and Dubinin-Radushkevich isotherm models were used to evaluate the equilibrium data at 20°C and regression coefficients were derived. Moreover, adsorption kinetics was analyzed using the pseudo-first-order and the pseudo-second-order kinetic models. Maximum chromium removal was found at pH 2.0. A kinetic study yielded an optimum equilibrium time of 90 minutes with an adsorbent dose of 2.5 g/50 mL. Results suggested that the equilibrium adsorption described by the Freundlich model. The kinetic data of the sorption showed that the pseudo second-order equation was the more appropriate. The results of the study indicated that fire clay was not a suitable adsorbent for Cr (IV). Apart from relatively long equilibrium time, the efficiency was not satisfactory. Therefore, searching for better alternative and/or modify such adsorbent is necessary in this area.

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Section: Isotherm Studiesmentioning

confidence: 75%

Section: Characterization Of Fire Claymentioning

confidence: 86%

Section: Effect Of Contact Time and Kineticsmentioning

confidence: 91%

See 1 more Smart Citation

Hexavalent Chromium Adsorption onto Fire Clay

Rahmani¹,

Foroughi²,

Noorimotlagh³

et al. 2016

Avicenna J Environ Health Eng

View full text Add to dashboard Cite

show abstract

“…In addition, many authors have used natural Akadama clay, modified chitosan and activated carbon for removal chromium [9][10][11] and sorbents derived from iron and aluminium such as granular ferric hydroxide, Fe-loaded sponge and gibbsite for arsenic reduction [3,[12][13][14]. Still, there are no low-cost and high effective methods and materials, even based on adsorption methods, for arsenic and chromium treatment, which predominantly exist in the inorganic anion forms of 2-(VI) [11,15].…”

Section: Introductionmentioning

confidence: 99%

“…Still, there are no low-cost and high effective methods and materials, even based on adsorption methods, for arsenic and chromium treatment, which predominantly exist in the inorganic anion forms of 2-(VI) [11,15]. Unfortunately, Cr (VI) is about one hundred to five hundred times more toxic than Cr (III) and toxicity of Cr (VI) can seriously destroy people's health including skin irritation, nausea, severe diarrhea, as well as lung, liver, and kidney damage because of its teratogenicity, mutagenicity, and carcinogenicity in biological systems [16,17].…”

Section: Introductionmentioning

confidence: 99%