Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design
In this study, luminescent bio-adsorbent nitrogen-doped carbon dots (N-CDs) was produced and applied for the removal and detection of Hg (II) from aqueous media. N-CDs were synthesized from oil palm empty fruit bunch carboxymethylcellulose (CMC) and urea. According to several analytical techniques u...
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| Format: | Article |
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Springer
2022
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| author | Issa, Mohammed Abdullah Zentou, Hamid H. Jabbar, Zaid Z. Abidin, Zurina Harun, Haninah Abdul Halim, Noor Amirah M. Alkhabet, Mohammed Y. Pudza, Musa |
| author_facet | Issa, Mohammed Abdullah Zentou, Hamid H. Jabbar, Zaid Z. Abidin, Zurina Harun, Haninah Abdul Halim, Noor Amirah M. Alkhabet, Mohammed Y. Pudza, Musa |
| author_sort | Issa, Mohammed Abdullah |
| collection | UPM |
| description | In this study, luminescent bio-adsorbent nitrogen-doped carbon dots (N-CDs) was produced and applied for the removal and detection of Hg (II) from aqueous media. N-CDs were synthesized from oil palm empty fruit bunch carboxymethylcellulose (CMC) and urea. According to several analytical techniques used, the obtained N-CDs display graphitic core with an average size of 4.2 nm, are enriched with active sites, stable over a wide range of pH and have great resistance to photobleaching. The N-CDs have bright blue emission with an improved quantum yield (QY) of up to 35.5%. The effect of the variables including pH, adsorbent mass, initial concentration and incubation time on the removal of Hg (II) was investigated using central composite design. The statistical results confirmed that the adsorption process could reach equilibrium within 30 min. The reduced cubic model (R2 = 0.9989) revealed a good correlation between the observed values and predicted data. The optimal variables were pH of 7, dose of 0.1 g, initial concentration of 100 mg/L and duration of 30 min. Under these conditions, adsorption efficiency of 84.6% was obtained. The adsorption kinetic data could be well expressed by pseudo-second-order kinetic and Langmuir isotherm models. The optimal adsorption capacity was 116.3 mg g−1. Furthermore, the adsorbent has a good selectivity towards Hg (II) with a detection limit of 0.01 μM due to the special interaction between Hg (II) and carboxyl/amino groups on the edge of N-CDs. This work provided an alternative direction for constructing low-cost adsorbents with effective sorption and sensing of Hg (II). |
| first_indexed | 2024-03-06T11:14:30Z |
| format | Article |
| id | upm.eprints-101039 |
| institution | Universiti Putra Malaysia |
| last_indexed | 2024-03-06T11:14:30Z |
| publishDate | 2022 |
| publisher | Springer |
| record_format | dspace |
| spelling | upm.eprints-1010392023-06-19T06:26:14Z http://psasir.upm.edu.my/id/eprint/101039/ Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design Issa, Mohammed Abdullah Zentou, Hamid H. Jabbar, Zaid Z. Abidin, Zurina Harun, Haninah Abdul Halim, Noor Amirah M. Alkhabet, Mohammed Y. Pudza, Musa In this study, luminescent bio-adsorbent nitrogen-doped carbon dots (N-CDs) was produced and applied for the removal and detection of Hg (II) from aqueous media. N-CDs were synthesized from oil palm empty fruit bunch carboxymethylcellulose (CMC) and urea. According to several analytical techniques used, the obtained N-CDs display graphitic core with an average size of 4.2 nm, are enriched with active sites, stable over a wide range of pH and have great resistance to photobleaching. The N-CDs have bright blue emission with an improved quantum yield (QY) of up to 35.5%. The effect of the variables including pH, adsorbent mass, initial concentration and incubation time on the removal of Hg (II) was investigated using central composite design. The statistical results confirmed that the adsorption process could reach equilibrium within 30 min. The reduced cubic model (R2 = 0.9989) revealed a good correlation between the observed values and predicted data. The optimal variables were pH of 7, dose of 0.1 g, initial concentration of 100 mg/L and duration of 30 min. Under these conditions, adsorption efficiency of 84.6% was obtained. The adsorption kinetic data could be well expressed by pseudo-second-order kinetic and Langmuir isotherm models. The optimal adsorption capacity was 116.3 mg g−1. Furthermore, the adsorbent has a good selectivity towards Hg (II) with a detection limit of 0.01 μM due to the special interaction between Hg (II) and carboxyl/amino groups on the edge of N-CDs. This work provided an alternative direction for constructing low-cost adsorbents with effective sorption and sensing of Hg (II). Springer 2022-07-08 Article PeerReviewed Issa, Mohammed Abdullah and Zentou, Hamid and H. Jabbar, Zaid and Z. Abidin, Zurina and Harun, Haninah and Abdul Halim, Noor Amirah and M. Alkhabet, Mohammed and Y. Pudza, Musa (2022) Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design. Environmental Science and Pollution Research, 29. pp. 86859-86872. ISSN 0944-1344; ESSN: 1614-7499 https://link.springer.com/article/10.1007/s11356-022-21844-0 10.1007/s11356-022-21844-0 |
| spellingShingle | Issa, Mohammed Abdullah Zentou, Hamid H. Jabbar, Zaid Z. Abidin, Zurina Harun, Haninah Abdul Halim, Noor Amirah M. Alkhabet, Mohammed Y. Pudza, Musa Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design |
| title | Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design |
| title_full | Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design |
| title_fullStr | Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design |
| title_full_unstemmed | Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design |
| title_short | Ecofriendly adsorption and sensitive detection of Hg (II) by biomass‑derived nitrogen‑doped carbon dots: process modelling using central composite design |
| title_sort | ecofriendly adsorption and sensitive detection of hg ii by biomass derived nitrogen doped carbon dots process modelling using central composite design |
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