Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study
The remediation of arsenic contamination in potable water is an important and urgent concern, necessitating immediate attention. With this objective in mind, the present study investigated arsenic removal from water using batch adsorption and fixed-bed column techniques. The material employed in thi...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-10-01
|
| Series: | Toxics |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2305-6304/11/10/849 |
| _version_ | 1827719791604924416 |
|---|---|
| author | Cosmin Vancea Georgiana Mladin Mihaela Ciopec Adina Negrea Narcis Duteanu Petru Negrea Giannin Mosoarca Catalin Ianasi |
| author_facet | Cosmin Vancea Georgiana Mladin Mihaela Ciopec Adina Negrea Narcis Duteanu Petru Negrea Giannin Mosoarca Catalin Ianasi |
| author_sort | Cosmin Vancea |
| collection | DOAJ |
| description | The remediation of arsenic contamination in potable water is an important and urgent concern, necessitating immediate attention. With this objective in mind, the present study investigated arsenic removal from water using batch adsorption and fixed-bed column techniques. The material employed in this study was a waste product derived from the treatment of groundwater water for potable purposes, having a substantial iron composition. The material’s properties were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier-transformed infrared spectroscopy (FT-IR). The point of zero charge (pH<sub>PZC</sub>) was measured, and the pore size and specific surface area were determined using the BET method. Under static conditions, kinetic, thermodynamic, and equilibrium studies were carried out to explore the influencing factors on the adsorption process, namely the pH, contact time, temperature, and initial arsenic concentration in the solution. It was found that the adsorption process is spontaneous, endothermic, and of a physical nature. In the batch adsorption studies, the maximum removal percentage was 80.4% after 90 min, and in a dynamic regime in the fixed-bed column, the efficiency was 99.99% at a sludge:sand = 1:1 ratio for 380 min for a volume of water with arsenic of ~3000 mL. The kinetics of the adsorption process conformed to a pseudo-second-order model. In terms of the equilibrium studies, the Sips model yielded the most accurate representation of the data, revealing a maximum equilibrium capacity of 70.1 mg As(V)/g sludge. For the dynamic regime, the experimental data were fitted using the Bohart–Adams, Thomas, and Clark models, in order to establish the mechanism of the process. Additionally, desorption studies were conducted, serving as an essential step in validating the practical applicability of the adsorption process, specifically in relation to the reutilization of the adsorbent material. |
| first_indexed | 2024-03-10T20:51:04Z |
| format | Article |
| id | doaj.art-7dd46c813dda4af59121cb35725542e3 |
| institution | Directory Open Access Journal |
| issn | 2305-6304 |
| language | English |
| last_indexed | 2024-03-10T20:51:04Z |
| publishDate | 2023-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Toxics |
| spelling | doaj.art-7dd46c813dda4af59121cb35725542e32023-11-19T18:21:53ZengMDPI AGToxics2305-63042023-10-01111084910.3390/toxics11100849Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column StudyCosmin Vancea0Georgiana Mladin1Mihaela Ciopec2Adina Negrea3Narcis Duteanu4Petru Negrea5Giannin Mosoarca6Catalin Ianasi7Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan, No. 6, 300223 Timisoara, RomaniaFaculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan, No. 6, 300223 Timisoara, RomaniaFaculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan, No. 6, 300223 Timisoara, RomaniaFaculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan, No. 6, 300223 Timisoara, RomaniaFaculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan, No. 6, 300223 Timisoara, RomaniaFaculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan, No. 6, 300223 Timisoara, RomaniaFaculty of Industrial Chemistry and Environmental Engineering, Politehnica University Timisoara, Bd. V. Parvan, No. 6, 300223 Timisoara, Romania“Coriolan Drăgulescu” Institute of Chemistry, Bv. Mihai Viteazul, No. 24, 300223 Timisoara, RomaniaThe remediation of arsenic contamination in potable water is an important and urgent concern, necessitating immediate attention. With this objective in mind, the present study investigated arsenic removal from water using batch adsorption and fixed-bed column techniques. The material employed in this study was a waste product derived from the treatment of groundwater water for potable purposes, having a substantial iron composition. The material’s properties were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and Fourier-transformed infrared spectroscopy (FT-IR). The point of zero charge (pH<sub>PZC</sub>) was measured, and the pore size and specific surface area were determined using the BET method. Under static conditions, kinetic, thermodynamic, and equilibrium studies were carried out to explore the influencing factors on the adsorption process, namely the pH, contact time, temperature, and initial arsenic concentration in the solution. It was found that the adsorption process is spontaneous, endothermic, and of a physical nature. In the batch adsorption studies, the maximum removal percentage was 80.4% after 90 min, and in a dynamic regime in the fixed-bed column, the efficiency was 99.99% at a sludge:sand = 1:1 ratio for 380 min for a volume of water with arsenic of ~3000 mL. The kinetics of the adsorption process conformed to a pseudo-second-order model. In terms of the equilibrium studies, the Sips model yielded the most accurate representation of the data, revealing a maximum equilibrium capacity of 70.1 mg As(V)/g sludge. For the dynamic regime, the experimental data were fitted using the Bohart–Adams, Thomas, and Clark models, in order to establish the mechanism of the process. Additionally, desorption studies were conducted, serving as an essential step in validating the practical applicability of the adsorption process, specifically in relation to the reutilization of the adsorbent material.https://www.mdpi.com/2305-6304/11/10/849arsenic removalunconventional material with iron content (UMIC)batch absorptionfixed-bed column adsorptionmechanism of adsorption |
| spellingShingle | Cosmin Vancea Georgiana Mladin Mihaela Ciopec Adina Negrea Narcis Duteanu Petru Negrea Giannin Mosoarca Catalin Ianasi Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study Toxics arsenic removal unconventional material with iron content (UMIC) batch absorption fixed-bed column adsorption mechanism of adsorption |
| title | Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study |
| title_full | Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study |
| title_fullStr | Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study |
| title_full_unstemmed | Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study |
| title_short | Arsenic Removal Using Unconventional Material with Iron Content: Batch Adsorption and Column Study |
| title_sort | arsenic removal using unconventional material with iron content batch adsorption and column study |
| topic | arsenic removal unconventional material with iron content (UMIC) batch absorption fixed-bed column adsorption mechanism of adsorption |
| url | https://www.mdpi.com/2305-6304/11/10/849 |
| work_keys_str_mv | AT cosminvancea arsenicremovalusingunconventionalmaterialwithironcontentbatchadsorptionandcolumnstudy AT georgianamladin arsenicremovalusingunconventionalmaterialwithironcontentbatchadsorptionandcolumnstudy AT mihaelaciopec arsenicremovalusingunconventionalmaterialwithironcontentbatchadsorptionandcolumnstudy AT adinanegrea arsenicremovalusingunconventionalmaterialwithironcontentbatchadsorptionandcolumnstudy AT narcisduteanu arsenicremovalusingunconventionalmaterialwithironcontentbatchadsorptionandcolumnstudy AT petrunegrea arsenicremovalusingunconventionalmaterialwithironcontentbatchadsorptionandcolumnstudy AT gianninmosoarca arsenicremovalusingunconventionalmaterialwithironcontentbatchadsorptionandcolumnstudy AT catalinianasi arsenicremovalusingunconventionalmaterialwithironcontentbatchadsorptionandcolumnstudy |