Low-valent manganese active sites: Insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron-modified cryptomelane
This study presents a facial co-precipitation method to enrich low-valent manganese sites for iron-doped cryptomelane. Fourier-transform infrared spectroscopy exhibits a noticeable enhancement of both vibrations at 1041 and 1116 cm-1 ascribed to Mn3+-OH bond over as-prepared materials. X-ray diffrac...
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Elsevier
2024-11-01
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| Series: | Chemical Engineering Journal Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666821124000826 |
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| author | Quoc-Dat Le Thanh-Thao Pham-Ngoc Ngoc-Thien Nguyen Nhat-Truong Truong Hai-Nam Tran Dung Van Nguyen Tuyet-Mai Tran-Thuy |
| author_facet | Quoc-Dat Le Thanh-Thao Pham-Ngoc Ngoc-Thien Nguyen Nhat-Truong Truong Hai-Nam Tran Dung Van Nguyen Tuyet-Mai Tran-Thuy |
| author_sort | Quoc-Dat Le |
| collection | DOAJ |
| description | This study presents a facial co-precipitation method to enrich low-valent manganese sites for iron-doped cryptomelane. Fourier-transform infrared spectroscopy exhibits a noticeable enhancement of both vibrations at 1041 and 1116 cm-1 ascribed to Mn3+-OH bond over as-prepared materials. X-ray diffraction, scanning electron microscopy, Raman spectroscopy, the temperature-programmed desorption of oxygen and inductively coupled plasma-mass spectrometry results all verify the increase in oxygen vacancies on iron-doped cryptomelane. The vital role of Mn3+-OH sites for adsorptive removal of acid blue 62 (AB62) was experimentally evident when adsorption capacity (Qe, mgAB62/gadsorbent) increased from 54 ± 1.3 mg/g (for non-doped cryptomelane) to 161 ± 6.7 mg/g (for Fe-0.15) at initial pH 5.7. The decrease of Qe from 313 mg/g (for initial pH 3.70) to 67 mg/g (for initial pH 9.95) over Fe-0.15 suggests protonation in acid media and deprotonation in basic media, reflecting efficient Mn3+-OH sites for reinforced interaction with sulfonate groups. The disappearance of sharp bands at 1041 and 1116 cm-1 after adsorption and the replenishment of a broad band at ∼1250 cm-1 over Fe-0.15 demonstrate the displacement of sulfonate groups by -OH species (from Mn3+-OH sites). Moreover, the deterioration of two stretching modes for O=S=O at 1187 and 1230 cm-1 after adsorption reveals the formation of a monodentate or bidentate complex. Kinetic studies confirm the compatibility of AB62 chemisorption over Fe-0.15 with the pseudo-second-order kinetic, Elovich, and Langmuir isotherm models. The current findings first support evidences for the AB62 chemisorption on iron-doped cryptomelane and a Fe-0.15-feasible adsorbent for removal of sulfonated anthraquinone dye. |
| format | Article |
| id | doaj-art-e44e8f1238ef40c280ccc31f957936e5 |
| institution | Kabale University |
| issn | 2666-8211 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
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| series | Chemical Engineering Journal Advances |
| spelling | doaj-art-e44e8f1238ef40c280ccc31f957936e52024-12-04T05:14:39ZengElsevierChemical Engineering Journal Advances2666-82112024-11-0120100665Low-valent manganese active sites: Insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron-modified cryptomelaneQuoc-Dat Le0Thanh-Thao Pham-Ngoc1Ngoc-Thien Nguyen2Nhat-Truong Truong3Hai-Nam Tran4Dung Van Nguyen5Tuyet-Mai Tran-Thuy6Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Viet NamFaculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Viet NamFaculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Viet NamFaculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Viet NamFaculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Viet NamFaculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Viet NamFaculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc City, Ho Chi Minh City, Viet Nam; Corresponding author at: Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Viet Nam.This study presents a facial co-precipitation method to enrich low-valent manganese sites for iron-doped cryptomelane. Fourier-transform infrared spectroscopy exhibits a noticeable enhancement of both vibrations at 1041 and 1116 cm-1 ascribed to Mn3+-OH bond over as-prepared materials. X-ray diffraction, scanning electron microscopy, Raman spectroscopy, the temperature-programmed desorption of oxygen and inductively coupled plasma-mass spectrometry results all verify the increase in oxygen vacancies on iron-doped cryptomelane. The vital role of Mn3+-OH sites for adsorptive removal of acid blue 62 (AB62) was experimentally evident when adsorption capacity (Qe, mgAB62/gadsorbent) increased from 54 ± 1.3 mg/g (for non-doped cryptomelane) to 161 ± 6.7 mg/g (for Fe-0.15) at initial pH 5.7. The decrease of Qe from 313 mg/g (for initial pH 3.70) to 67 mg/g (for initial pH 9.95) over Fe-0.15 suggests protonation in acid media and deprotonation in basic media, reflecting efficient Mn3+-OH sites for reinforced interaction with sulfonate groups. The disappearance of sharp bands at 1041 and 1116 cm-1 after adsorption and the replenishment of a broad band at ∼1250 cm-1 over Fe-0.15 demonstrate the displacement of sulfonate groups by -OH species (from Mn3+-OH sites). Moreover, the deterioration of two stretching modes for O=S=O at 1187 and 1230 cm-1 after adsorption reveals the formation of a monodentate or bidentate complex. Kinetic studies confirm the compatibility of AB62 chemisorption over Fe-0.15 with the pseudo-second-order kinetic, Elovich, and Langmuir isotherm models. The current findings first support evidences for the AB62 chemisorption on iron-doped cryptomelane and a Fe-0.15-feasible adsorbent for removal of sulfonated anthraquinone dye.http://www.sciencedirect.com/science/article/pii/S2666821124000826Fe-doped cryptomelaneOxygen vacanciesManganese oxideAcid blue 62Elovich and Langmuir isotherm modelsChemisorption |
| spellingShingle | Quoc-Dat Le Thanh-Thao Pham-Ngoc Ngoc-Thien Nguyen Nhat-Truong Truong Hai-Nam Tran Dung Van Nguyen Tuyet-Mai Tran-Thuy Low-valent manganese active sites: Insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron-modified cryptomelane Chemical Engineering Journal Advances Fe-doped cryptomelane Oxygen vacancies Manganese oxide Acid blue 62 Elovich and Langmuir isotherm models Chemisorption |
| title | Low-valent manganese active sites: Insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron-modified cryptomelane |
| title_full | Low-valent manganese active sites: Insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron-modified cryptomelane |
| title_fullStr | Low-valent manganese active sites: Insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron-modified cryptomelane |
| title_full_unstemmed | Low-valent manganese active sites: Insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron-modified cryptomelane |
| title_short | Low-valent manganese active sites: Insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron-modified cryptomelane |
| title_sort | low valent manganese active sites insight into reinforced interaction with sulfonated anthraquinone dye and kinetic adsorption studies over iron modified cryptomelane |
| topic | Fe-doped cryptomelane Oxygen vacancies Manganese oxide Acid blue 62 Elovich and Langmuir isotherm models Chemisorption |
| url | http://www.sciencedirect.com/science/article/pii/S2666821124000826 |
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