Mercury(II) removal from aqueous solutions and wastewaters using a novel cation exchanger derived from coconut coir pith and its recovery

Anirudhan, T.S.; Divya, L.; Ramachandran, M.

doi:10.1016/j.jhazmat.2008.01.030

Cited by 124 publications

(55 citation statements)

References 22 publications

(23 reference statements)

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“…Various conventional adsorbents such as carbon materials, carbons derived from agricultural wastes and industrial wastes, biomaterials, and other materials have been investigated for the mercury removal (Yardim et al 2003;Labidi 2008;Anirudhan et al 2008;Sari and Tuzen, 2009;Mehdinia et al 2015;Vasudevan et al 2012;Wang et al 2014) but they are not highly efficient. Therefore, researchers are still making great efforts to identify new adsorbents with high capacities and efficacies.…”

Section: Introductionmentioning

confidence: 99%

Isotherm, kinetic, and thermodynamic studies on Hg(II) adsorption from aqueous solution by silica- multiwall carbon nanotubes

Saleh

2015

Environ Sci Pollut Res

523

141

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Silica combined with 2% multiwall carbon nanotubes (SiO2-CNT) was synthesized and characterized. Its sorption efficacy was investigated for the Hg(II) removal from an aqueous solution. The effect of pH on the percentage removal by the prepared material was examined in the range from 3 to 7. The adsorption kinetics were well fitted by using a pseudo-second-order model at various initial Hg(II) concentrations with R (2) of >0.99. The experimental data were plotted using the interparticle diffusion model, which indicated that the interparticle diffusion is not the only rate-limiting step. The data is well described by the Freundlich isotherm equation. The activation energy (Ea) for adsorption was 12.7 kJ mol(-1), indicating the process is to be physisorption. Consistent with an endothermic process, an increase in the temperature resulted in increasing mercury removal with a ∆H(o) of 13.3 kJ/mol and a ∆S(o) 67.5 J/mol K. The experimental results demonstrate that the combining of silica and nanotubes is a promising alternative material, which can be used to remove the mercury from wastewaters.

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Section: Introductionmentioning

confidence: 99%

Isotherm, kinetic, and thermodynamic studies on Hg(II) adsorption from aqueous solution by silica- multiwall carbon nanotubes

Saleh

2015

Environ Sci Pollut Res

523

141

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“…Nigeria is the fifth largest producer of coconut in Africa with a net annual output of 260,000 metric tons (Uwubanmwen et al, 2011). Efforts have been made to create value from coconut wastes by utilising them as precursors for preparation of adsorbents, ropes, twines, mats, mulch for organic fertiliser etc (Anirudhan et al, 2008;Bilba et al, 2007;Namasivayam and Sangeetha, 2008). However, coconut coir has been reported to be an attractive feedstock for bioethanol production due to its high cellulose and hemicellulose content (Vaithanomsat et al, 2010).…”

Section: Abstract: Coconut Coir Lignocellulosic Feedstock Response mentioning

confidence: 99%

Effect of Acid mixtures on the Hydrolysis of Coconut Coir for Recovery of Fermentable Sugars

Amenaghawon¹,

Osayuki-Aguebor²,

Egharevba³

2015

Journal of Applied Sciences and Environmental Management

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In this study, coconut coir was hydrolysed to produce fermentable sugars using dilute nitric and acetic acid. The hydrolysis process was carried out according to a four variable Box-Behnken design which was used to develop a statistical model to describe the relationship between the concentration of fermentable sugars produced (dependent variable) and the independent variables (time, temperature, nitric acid concentration and acetic acid concentration). Results of analysis of variance (ANOVA) performed to determine the fit of the statistical model showed that the model was statistically significant (p<0.0001) with a low standard deviation (1.77) and non-significant lack of fit (R 2 =0.93). The concentrations of nitric and acetic acid as well as the hydrolysis time and temperature all positively influenced the hydrolysis process as evident in the increase in the amount of fermentable sugars produced when the values of these variables were increased. When both acids were combined together, the amount of fermentable sugar produced was increased by as much 54%. Optimisation of the statistical model showed that the maximum sugar concentration was 32.7 g/L and this was obtained for coconut coir catalysed by 0.50 %w/v nitric acid, 0.40 %w/v acetic acid at 160 o C for 30 minutes. Validation of the statistical model showed that there was no significant difference between predicted and observed values. © JASEM http://dx.doi.org/10.4314/jasem/v19i3.2

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“…In addition to potent toxicity, these heavy metals are persistent and can bio-accumulate in the environment [3,4]. The main sources of these contaminants are from anthropogenic activities such as mining and electrical and electronics manufacturing [5]. Metal cations are often strong.…”

Section: Introductionmentioning

confidence: 99%

Application of Stabilized Nanoparticles for In Situ Remediation of Metal-Contaminated Soil and Groundwater: a Critical Review

et al. 2015

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Remediation of soil and groundwater contaminated with toxic metals has been a major environmental challenge for decades. Yet, cost-effective and sustainable in situ remediation technologies remain lacking. Over the last 15 years or so, an innovative in situ remediation strategy has shown promising by means of stabilized nanoparticles. Stabilized nanoparticles are prepared using novel stabilizers that facilitate the deliverability and transport of nanoparticles in the subsurface. This study reviews synthesis and characterization of some model stabilized nanoparticles and their application for remediation of metal-contaminated soil and water. Fate and transport of these stabilized nanoparticles in groundwater and soil are also examined. Lastly, this review identifies the key knowledge gaps such as lack of field data pertaining to the long-term effectiveness of the immobilized metals and impacts of the delivered nanoparticles on the biogeochemical conditions in the subsurface. The information may facilitate further development of this promising remediation technology.

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Mercury(II) removal from aqueous solutions and wastewaters using a novel cation exchanger derived from coconut coir pith and its recovery

Cited by 124 publications

References 22 publications

Isotherm, kinetic, and thermodynamic studies on Hg(II) adsorption from aqueous solution by silica- multiwall carbon nanotubes

Isotherm, kinetic, and thermodynamic studies on Hg(II) adsorption from aqueous solution by silica- multiwall carbon nanotubes

Effect of Acid mixtures on the Hydrolysis of Coconut Coir for Recovery of Fermentable Sugars

Application of Stabilized Nanoparticles for In Situ Remediation of Metal-Contaminated Soil and Groundwater: a Critical Review

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