Effect of pH on cadmium biosorption by coconut copra meal

Ofomaja, Augustine E.; Ho, Yuh‐Shan

doi:10.1016/j.jhazmat.2006.06.039

Cited by 170 publications

(68 citation statements)

References 31 publications

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“…Although specific studies on tea waste are lacking, charged and polar functional groups on the surface of proteins or of other cell-wall components (cellulose, hemicellulose, pectin, lignin) are considered to be the main responsible for metal removal (Basso et al, 2002;Pagnanelli et al, 2003). Metal-binding sites can replace hydrogen ions with metal ions or donate an electron pair to form metal complexes (Ofomaja and Ho, 2007;Demirbas, 2008).…”

Section: Discussionmentioning

confidence: 99%

Adsorption of Pb(II) on Spent Leaves of Green and Black Tea

Zuorro¹,

Lavecchia

2010

American Journal of Applied Sciences

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Problem statement:In recent years much attention has been focused on the use of biomass residues as low-cost adsorbents for the removal of heavy metal ions from contaminated waters. Spent tea leaves, an abundantly available material that is currently disposed of as a solid waste, are potentially suitable for such applications. Approach: To provide some information on the adsorption properties of tea waste, we evaluated the removal efficiency of lead ions by spent leaves of green and black tea. Batch adsorption experiments were made at 25 and 40°C at initial lead-ion concentrations between 0.01 and 2 g L −1 . Equilibrium data were analyzed by the Langmuir equation to evaluate the maximum adsorption capacity and the equilibrium constant. The adsorption characteristics of the two materials were also compared with those of coffee grounds, activated carbon and Fuller's earth. Results: Experimental data showed that removal efficiencies up to 98-99% can be achieved when using spent tea leaves as lead adsorbent. The results were only marginally affected by the type of tea waste. At low lead loading, the adsorption equilibrium was well described by the Langmuir equation, with a maximum adsorption capacity of 83-130 mg g −1 and an equilibrium constant ranging from 0.112-0.245 L mg −1 . A comparison with other adsorbents provided the following order for lead removal efficiency: Black tea, coffee grounds > green tea > Fuller's earth > activated carbon. Conclusion:The results from this study indicate that using spent tea leaves as an adsorbent may be an efficient and economical means for removing lead and, presumably, other heavy metal ions from aqueous solutions.

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Section: Discussionmentioning

confidence: 99%

Adsorption of Pb(II) on Spent Leaves of Green and Black Tea

Zuorro¹,

Lavecchia

2010

American Journal of Applied Sciences

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“…The disparities suggest that coconut copra residues are genuinely richer in carboxyl groups, and the more intense peaks at 2922 cm -1 and 2850 cm -1 further indicate the presence of long alkyl chains. The relative Coconut copra abundance could not be compared with the findings of Ho and Ofomaja (2007), as a spectrum was not shown in their paper. Despite the wide ranging studies on coconutbased adsorbents (Bhatnagar et al 2010), there have been only a few reports concerning coconut copra (Ho and Ofomaja 2006;Ofomaja and Ho 2007); hence, limited data concerning its chemical characteristics are available.…”

Section: Resultsmentioning

confidence: 88%

“…The relative Coconut copra abundance could not be compared with the findings of Ho and Ofomaja (2007), as a spectrum was not shown in their paper. Despite the wide ranging studies on coconutbased adsorbents (Bhatnagar et al 2010), there have been only a few reports concerning coconut copra (Ho and Ofomaja 2006;Ofomaja and Ho 2007); hence, limited data concerning its chemical characteristics are available. Raw and modified coconut copra residues (refluxed and citric acid-treated) were introduced to peat swamp runoff.…”

Section: Resultsmentioning

confidence: 88%

Modified Coconut Copra Residues as a Low Cost Biosorbent for Adsorption of Humic Substances from Peat Swamp Runoff

Sim¹,

Lee²,

Lu³

et al. 2013

BioResources

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The presence of dissolved organic matter, scientifically known as humic substances, gives an undesirable color and taste to water. In addition, they are the precursors of carcinogenic disinfection by-products upon disinfection treatment. Adsorption provides a potential means of removal of humic substances, and lignocellulosic biomass serves as a promising candidate. In this paper, we report the application of modified coconut copra residues for adsorption of humic substances from peat swamp runoff. The FTIR spectra suggest that coconut copra residues are genuinely rich with carboxyl groups with long alkyl chains; this renders the material a natural biosorbent, attaining an average of 50% removal under the conditions of testing. Upon treatment, dissolution of lignin and hemicellulose with the enhancement of effective carboxyl groups occurs, improving the adsorption efficiency to 96%; the treated water is visibly clear. The relative band abundance and band shifts further confirm the involvement of the surface functional groups in the adsorption process. The modified coconut copra residue is an attractive biosorbent option for removal of humic substances. The operating conditions are mild, involving non-toxic chemicals, and no pH adjustment is necessary to allow adsorption.

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“…The weakening of the adsorptive forces between the active sites on the adsorbent and the phenol species, and also between adjacent phenol molecules on the adsorbed phase may be considered as a probable explanation of the observed phenomenon. An increase in temperature may have decreased the adsorptive forces between the phenol species and the active sites on the adsorbent surface and thereby resulted in a decrease in the adsorption efficiency [33]. Figure 1D shows the effect of initial phenol concentration on the % removal of phenol for four different concentrations (10, 20, 50 and 100 mg L -1 ) at 303 K and pH 5.…”

Section: Effect Of Temperaturementioning

confidence: 99%

Phenol Adsorption onto Various Soil Composite Membranes: Insight into Process Kinetics, Modelling and Optimisation Using Response Surface Methodology

Goswami¹

2015

Hydrol Current Res

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Effect of pH on cadmium biosorption by coconut copra meal

Cited by 170 publications

References 31 publications

Adsorption of Pb(II) on Spent Leaves of Green and Black Tea

Adsorption of Pb(II) on Spent Leaves of Green and Black Tea

Modified Coconut Copra Residues as a Low Cost Biosorbent for Adsorption of Humic Substances from Peat Swamp Runoff

Phenol Adsorption onto Various Soil Composite Membranes: Insight into Process Kinetics, Modelling and Optimisation Using Response Surface Methodology

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