High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses
This study was conducted to investigate the high efficiency of coconut pith (CP) adsorbent in removing Hg(II) and MeHg(II) ions from aqueous solution. The CP adsorbent was characterized using a scanning electron microscope (SEM), nitrogen adsorption-desorption (NAD) analysis, determination of pH at...
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| Format: | Article |
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Elsevier Ltd
2016
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| _version_ | 1796861935719809024 |
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| author | Saman, N. Johari, K. Song, S. T. Kong, H. Cheu, S. C. Mat, H. |
| author_facet | Saman, N. Johari, K. Song, S. T. Kong, H. Cheu, S. C. Mat, H. |
| author_sort | Saman, N. |
| collection | ePrints |
| description | This study was conducted to investigate the high efficiency of coconut pith (CP) adsorbent in removing Hg(II) and MeHg(II) ions from aqueous solution. The CP adsorbent was characterized using a scanning electron microscope (SEM), nitrogen adsorption-desorption (NAD) analysis, determination of pH at zero point charge (pHpzc), Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Adsorption performance of the CP adsorbent at various parameters was conducted by varying the initial pH of solution, adsorbent dosage, initial pH, temperature, and contact time. It was found that adsorption capacity, adsorption rate and enthalpy of the Hg(II) adsorption were higher compared to the MeHg(II). The adsorption capacity of Hg(II) was 2.60 mmol/g, which was five times higher than MeHg(II). The adsorption isotherm analysis showed that the Hg(II) and MeHg(II) adsorption data fitted to the Langmuir and Freundlich models, respectively. The overall mechanism of both mercury adsorptions is a combination of physical and chemical processes in which the film diffusion was the rate controlling-step. The adsorbent regenerability study results showed that the Hg(II) adsorption remained stable up to five adsorption cycles, which was better than MeHg(II). The selectivity studies reveal the potential application of the CP adsorbent for the treatment of oilfield produced water (OPW) and natural gas condensate (NGC) that are rich in mercury ions as well as other cations. |
| first_indexed | 2024-03-05T20:03:57Z |
| format | Article |
| id | utm.eprints-72450 |
| institution | Universiti Teknologi Malaysia - ePrints |
| last_indexed | 2024-03-05T20:03:57Z |
| publishDate | 2016 |
| publisher | Elsevier Ltd |
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| spelling | utm.eprints-724502017-11-27T02:37:18Z http://eprints.utm.my/72450/ High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses Saman, N. Johari, K. Song, S. T. Kong, H. Cheu, S. C. Mat, H. TP Chemical technology This study was conducted to investigate the high efficiency of coconut pith (CP) adsorbent in removing Hg(II) and MeHg(II) ions from aqueous solution. The CP adsorbent was characterized using a scanning electron microscope (SEM), nitrogen adsorption-desorption (NAD) analysis, determination of pH at zero point charge (pHpzc), Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Adsorption performance of the CP adsorbent at various parameters was conducted by varying the initial pH of solution, adsorbent dosage, initial pH, temperature, and contact time. It was found that adsorption capacity, adsorption rate and enthalpy of the Hg(II) adsorption were higher compared to the MeHg(II). The adsorption capacity of Hg(II) was 2.60 mmol/g, which was five times higher than MeHg(II). The adsorption isotherm analysis showed that the Hg(II) and MeHg(II) adsorption data fitted to the Langmuir and Freundlich models, respectively. The overall mechanism of both mercury adsorptions is a combination of physical and chemical processes in which the film diffusion was the rate controlling-step. The adsorbent regenerability study results showed that the Hg(II) adsorption remained stable up to five adsorption cycles, which was better than MeHg(II). The selectivity studies reveal the potential application of the CP adsorbent for the treatment of oilfield produced water (OPW) and natural gas condensate (NGC) that are rich in mercury ions as well as other cations. Elsevier Ltd 2016 Article PeerReviewed Saman, N. and Johari, K. and Song, S. T. and Kong, H. and Cheu, S. C. and Mat, H. (2016) High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses. Journal of Environmental Chemical Engineering, 4 (2). pp. 2487-2499. ISSN 2213-3437 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84965176724&doi=10.1016%2fj.jece.2016.04.033&partnerID=40&md5=61377a7e6ee30f62ca4381775e132d2a |
| spellingShingle | TP Chemical technology Saman, N. Johari, K. Song, S. T. Kong, H. Cheu, S. C. Mat, H. High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses |
| title | High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses |
| title_full | High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses |
| title_fullStr | High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses |
| title_full_unstemmed | High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses |
| title_short | High removal efficiency of Hg(II) and MeHg(II) from aqueous solution by coconut pith - Equilibrium, kinetic and mechanism analyses |
| title_sort | high removal efficiency of hg ii and mehg ii from aqueous solution by coconut pith equilibrium kinetic and mechanism analyses |
| topic | TP Chemical technology |
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