Removal of Cr(VI) from aqueous solution by adsorption onto activated carbon

Selvi, K. Thamarai; Pattabhi, S.; Kadirvelu, K.

doi:10.1016/s0960-8524(01)00068-2

Cited by 509 publications

(166 citation statements)

References 16 publications

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“…It is also evident that the sorption affinity of the derived activated carbon towards Cadmium and Zinc is better than other available adsorbents. Selvi et al (2001) studied the removal of Chromium from aqueous solution by adsorption onto activated carbon prepared from coconut tree sawdust for the removal of chromuim from aqueous solution. Batch mode adsorption studies were carried out by varying agitation time, initial Chromium concentration, carbon concentration, and pH.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of removal efficiency of heavy metals by low-cost activated carbon prepared from African palm fruit

2016

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This study details the removal of heavy metals; Cadmium, Copper, Nickel, and Lead from wastewater effluent using an activated carbon produced from African palm fruit. The effluent was obtained from Old Panteka market; a metal scrap Market located in Kaduna State, Nigeria, which has several components that constitute high level of pollution in the environment. The effect of temperature and contact time on the removal of these heavy metals using the activated carbon produced was investigated. The activated carbon showed a significant ability in removing heavy metals; Cadmium, Copper, Nickel, and Lead from the wastewater. Higher percentage removal was observed at a temperature of 80°C (93.23 ± 0.035, 96.71 ± 0.097, 92.01 ± 0.018, and 95.42 ± 0.067 % for Cadmium, Copper, Nickel, and Lead, respectively) and at an optimum contact time of 60 min (99.235 ± 0.148, 96.711 ± 0.083, 95.34 ± 0.015, and 97.750 ± 0.166 % for Cadmium, Copper, Nickel, and Lead, respectively) after which the percentage removal decreases. This work, therefore, suggests that African palm fruit can be successfully applied to solve this environmental pollution.

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Section: Introductionmentioning

confidence: 99%

Evaluation of removal efficiency of heavy metals by low-cost activated carbon prepared from African palm fruit

2016

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“…Although the last method is probably the most commonly employed, it is very inefficient because a large amount of sludge is produced and the chromium cannot be recovered from the precipitate, making this strategy very expensive (Leyva Ramos et al 1994). On the other hand, adsorption is considered to be an efficient method for removing heavy metals from wastewater (Aggarwal et al 1999;Selvi et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of chromium(VI) onto electrochemically obtained magnetite nanoparticles

Martínez

Muñoz‐Bonilla

Mazarío

et al. 2015

Int. J. Environ. Sci. Technol.

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Well-dispersed magnetite nanoparticles of different sizes between 15 and 43 nm were synthesized by an electrochemical method in a controlled manner by simply changing the synthesis temperature. These nanoparticles were used as a reusable adsorbent to remove Cr(VI) from aqueous solution. The recovery efficiency was found to be highly dependent on environmental parameters, such as temperature and pH. In addition, it was demonstrated that the initial concentrations of both Cr(VI) and magnetite nanoparticles strongly influence the removal capability of these nanomaterials. Remarkably, the nanoparticle size has a key role on the Cr(VI) adsorption efficiency, which gradually increases as the diameter decreases due to the augmentation of the surface area. The low aggregation in the case of small particles that results from the low magnetization saturation values also contributes to the enhancement of the surface area available for Cr(VI) adsorption. In contrast, nanoparticles with larger sizes are more easily manipulated by a magnet, and the efficiency is largely maintained after five cycles. The adsorption process fits the Langmuir isotherm model well, and the reaction was found to follow a pseudo-second-order rate.

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“…The appearance of this phenomenon is related to the nature of the activated carbon and the form in which Cr is present in the solution [30]. The main form exists of hexavalent chromium in water environment include CrO4 2− , HCrO4 − and Cr2O7 2− .The stability is susceptible to the pH value of the solution, the redox substances and other conditions, it also can be interconverted under certain conditions [31]. …”

Section: Adsorption Effect Of Cr (Vi) At Different Phmentioning

confidence: 99%

Gemini Surfactant-Modified Activated Carbon for Remediation of Hexavalent Chromium from Water

Zhou

Wang

Hursthouse

et al. 2018

Water

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Gemini surfactants, with double hydrophilic and hydrophobic groups, offer potentially orders of magnitude greater surface activity compared to similar single unit molecules. A cationic Gemini surfactant (Propyl didodecyldimethylammonium Bromide, PDDDAB) and a conventional cationic surfactant (Dodecyltrimethylammonium Bromide, DTAB) were used to pre-treat and generate activated carbon. The removal efficiency of the surfactant-modified activated carbon through adsorption of chromium(VI) was investigated under controlled laboratory conditions. Fourier-transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM) were used to investigate the surface changes of surfactant-modified activated carbon. The effect of important parameters such as adsorbent dosage, pH, ionic strength and contact time were also investigated. The chromium(VI) was adsorbed more significantly on the Gemini surfactant-modified activated carbon than on the conventional surfactant-modified activated carbon. The correlation coefficients show the data best fit the Freundlich model, which confirms the monolayer adsorption of chromium(VI) onto Gemini surfactant-modified activated carbon. From this assessment, the surfactant-modified (especially Gemini surfactant-modified) activated carbon in this study showed promise for practical applications to treat water pollution.

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Removal of Cr(VI) from aqueous solution by adsorption onto activated carbon

Cited by 509 publications

References 16 publications

Evaluation of removal efficiency of heavy metals by low-cost activated carbon prepared from African palm fruit

Evaluation of removal efficiency of heavy metals by low-cost activated carbon prepared from African palm fruit

Adsorption of chromium(VI) onto electrochemically obtained magnetite nanoparticles

Gemini Surfactant-Modified Activated Carbon for Remediation of Hexavalent Chromium from Water

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