Adsorption of chromium (III) ion from aqueous solution using rice hull ash

Wang, Lihua; Lin, Chun‐I

doi:10.1016/j.jcice.2008.02.004

Cited by 31 publications

(16 citation statements)

References 30 publications

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“…The maximum adsorption at pH 3 may be attributed to the existence of chromium ions as HCrO 4 -which is the dominant form of Cr(VI) at pH 3. The high adsorption of Cr(VI) at pH 3 might be a result of electrostatic attraction between positively charged groups of the ACRF surface and HCrO 4 -.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

“…Persistent exposure to Cr(VI) causes cancer in the digestive tract and lungs, and may cause other health problems, for instance skin dermatitis, bronchitis, perforation of the nasal septum, severe diarrhoea, and haemorrhaging [2,3]. The maximum level for chromium in drinking water permitted by the World Health Organization (WHO) is 0.05 mg/L [4].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Oyedoh

Ekwonu

2016

Acta Polytech

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Abstract. The adsorption of chromium(VI) metal ion in aqueous solutions by activated carbon resorcinol formaldehyde xerogels (ACRF) was investigated. The results showed that pore structure, surface area and the adsorbent surface chemistry are important factors in the control of the adsorption of chromium(VI) metal ions. The isotherm parameters were obtained from plots of the isotherms and from the application of Langmuir and Freundlich Isotherms. Based on regression analysis, the Langmuir isotherm model was the best fit. The maximum adsorption capacity of ACRF for chromium (VI) was 241.9 mg/g. The pseudo-second-order kinetic model was the best fit to the experimental data for the adsorption of chromium metal ions by activated carbon resorcinol formaldehyde xerogels. The thermodynamics of Cr(VI) ions adsorption onto ACRF was a spontaneous and endothermic process.

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Section: Effect Of Initial Phmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Oyedoh

Ekwonu

2016

Acta Polytech

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“…Several studies have shown that non-living plant biomass materials are effective for the removal of trace metals from the environment (Elaigwu et al, 2009;Wang and Lin, 2008). Whereas many previous studies have reported the adsorption of metals by materials of diverse biological origin, these have remained limited to the removal of single metal ion and little information is available for multimetal adsorption systems (Abdel-Ghani et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Remediation of Cr and Fe from aqueous solution by natural adsorbents

Ibrahim¹,

Jimoh²

2011

International Journal of Biological and Chemical Sciences

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Different kinds of low-cost agro based fibres can be used to remove both trace and heavy metals from aqueous solutions. The removal efficiency of maize (Zea mays) cob, sawdust and coal coded as MC, SD and CO respectively was investigated in this study for the bioremediation of chromium and iron. Sorption experiments were carried out using batch process in which changes in concentration of the adsorbates were monitored by the use of Shimadzu AA650 Double Beam Atomic Absorption/Flame spectrophotometer. Effects of varying adsorbent dose, adsorbate loading concentration, pH, and adsorbent surface area were studied. At optimum adsorbent dose, remediation of Cr varies according to CO > SD > MC, while that of Fe varies according to MC > CO > SD. However, on individual adsorbents the remediation efficiency is; on MC Cr has 48.5% while Fe has 100%, while on SD Cr has 97.85% while Fe has 95% and lastly on CO Cr has 98.57% and Fe has 98%. This shows that the adsorbent can selectively be employed for the remediation of the ions from the solutions.

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“…Also apparent from the figure is the increase in % removal of each metal ion as a result of increase in adsorbent dose for both adsorbents under investigation; a trend similarly reported by various workers such as Bansal et al (2009) and Opeolu et al (2009). This observed phenomenon is readily understood from the fact that the number of available adsorption sites increases by increasing the adsorbent dose and it, therefore, results in the increase of removal efficiency of the respective ions (Bhattacharya et al, (2008); Wang & Lin (2008)). The adsorption order of the ions on GZM varies according to Fe > Cr > Cd > Ni, while on GCO the order is Fe > Cr > Ni > Cd, which according to Sun and Shin (1998) could be explained based on the modes of adsorption onto cellulosic materials as represented by intrinsic and coulombic interactions.…”

Section: Resultsmentioning

confidence: 99%

Coal and <i>Zea mays</i> cob waste as adsorbents for removal of metallic ions from wastewater

Ibrahim¹

2013

Bayero J. Pure App. Sci.

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The efficiency of coal (CO) and Zea mays (ZM) cob adsorbents for the removal of metallic ions from wastewater is reported. The adsorbents were used in both their granular (GCO and GZM) and powdered (PCO and PZM) forms respectively. Chromium, nickel, iron and cadmium were used as model ions. Efficiency of the method relied on the use of Shimadzu AA650 double beam atomic absorption/flame spectrophotometer. Effects of varying adsorbent dose, adsorbate loading concentration, pH and adsorbent surface area on the percentage removal of the adsorbates were studied. Results revealed that coal relatively have higher affinity for the tested ions compared to zea mays cob. The order of removal on the two adsorbents are nearly similar with little variations for Ni and Cd. Thermodynamic analyses at 303, 313, 323 and 333K and at optimum adsorbent weight and 60mgL -1 initial adsorbate loading concentration indicates a spontaneous and feasible process.

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Adsorption of chromium (III) ion from aqueous solution using rice hull ash

Cited by 31 publications

References 30 publications

Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Experimental Investigation on Chromium(vi) Removal From Aqueous Solution Using Activated Carbon Resorcinol Formaldehyde Xerogels

Remediation of Cr and Fe from aqueous solution by natural adsorbents

Coal and <i>Zea mays</i> cob waste as adsorbents for removal of metallic ions from wastewater

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