Systematic Performance Comparison of Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxymonosulfate and Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxydisulfate Systems for Organics Removal
Activated zero-valent iron (Ac-ZVI) coupled with Fe<sup>3+</sup> was employed to activate peroxymonosulfate (PMS) and peroxydisulfate (PDS) for acid orange 7 (AO7) removal. Fe<sup>3+</sup> was used to promote Fe<sup>2+</sup> liberation from Ac-ZVI as an active spe...
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| Online Access: | https://www.mdpi.com/1996-1944/14/18/5284 |
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| author | Wen-Da Oh Yeek-Chia Ho Mardawani Mohamad Chii-Dong Ho Rajiv Ravi Jun-Wei Lim |
| author_facet | Wen-Da Oh Yeek-Chia Ho Mardawani Mohamad Chii-Dong Ho Rajiv Ravi Jun-Wei Lim |
| author_sort | Wen-Da Oh |
| collection | DOAJ |
| description | Activated zero-valent iron (Ac-ZVI) coupled with Fe<sup>3+</sup> was employed to activate peroxymonosulfate (PMS) and peroxydisulfate (PDS) for acid orange 7 (AO7) removal. Fe<sup>3+</sup> was used to promote Fe<sup>2+</sup> liberation from Ac-ZVI as an active species for reactive oxygen species (ROS) generation. The factors affecting AO7 degradation, namely, the Ac-ZVI:Fe<sup>3+</sup> ratio, PMS/PDS dosage, and pH, were compared. In both PMS and PDS systems, the AO7 degradation rate increased gradually with increasing Fe<sup>3+</sup> concentration at fixed Ac-ZVI loading due to the Fe<sup>3+</sup>-promoted liberation of Fe<sup>2+</sup> from Ac-ZVI. The AO7 degradation rate increased with increasing PMS/PDS dosage due to the greater amount of ROS generated. The degradation rate in the PDS system decreased while the degradation rate in the PMS system increased with increasing pH due to the difference in the PDS and PMS activation mechanisms. On the basis of the radical scavenging study, sulfate radical was identified as the dominant ROS in both systems. The physicochemical properties of pristine and used Ac-ZVI were characterized, indicating that the used Ac-ZVI had an increased BET specific surface area due to the formation of Fe<sub>2</sub>O<sub>3</sub> nanoparticles during PMS/PDS activation. Nevertheless, both systems displayed good reusability and stability for at least three cycles, indicating that the systems are promising for pollutant removal. |
| first_indexed | 2024-03-10T07:28:52Z |
| format | Article |
| id | doaj.art-479a6577414840f1afcebf568f341d42 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T07:28:52Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-479a6577414840f1afcebf568f341d422023-11-22T14:01:43ZengMDPI AGMaterials1996-19442021-09-011418528410.3390/ma14185284Systematic Performance Comparison of Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxymonosulfate and Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxydisulfate Systems for Organics RemovalWen-Da Oh0Yeek-Chia Ho1Mardawani Mohamad2Chii-Dong Ho3Rajiv Ravi4Jun-Wei Lim5School of Chemical Sciences, Universiti Sains Malaysia, Gelugor 11800, Penang, MalaysiaCivil and Environmental Engineering Department, Centre for Urban Resource Sustainability, Institute of Self-Sustainable Building, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak Darul Ridzuan, MalaysiaFaculty of Bioengineering and Technology, Universiti Malaysia Kelantan, Jeli Campus, Jeli 17600, Kelantan, MalaysiaDepartment of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei 251, TaiwanSchool of Applied Sciences, Faculty of Integrated Life Science, Quest International University, Ipoh 30250, Perak, MalaysiaDepartment of Fundamental and Applied Sciences, HICoE-Centre for Biofuel and Biochemical Research, Institute of Self-Sustainable Building, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak Darul Ridzuan, MalaysiaActivated zero-valent iron (Ac-ZVI) coupled with Fe<sup>3+</sup> was employed to activate peroxymonosulfate (PMS) and peroxydisulfate (PDS) for acid orange 7 (AO7) removal. Fe<sup>3+</sup> was used to promote Fe<sup>2+</sup> liberation from Ac-ZVI as an active species for reactive oxygen species (ROS) generation. The factors affecting AO7 degradation, namely, the Ac-ZVI:Fe<sup>3+</sup> ratio, PMS/PDS dosage, and pH, were compared. In both PMS and PDS systems, the AO7 degradation rate increased gradually with increasing Fe<sup>3+</sup> concentration at fixed Ac-ZVI loading due to the Fe<sup>3+</sup>-promoted liberation of Fe<sup>2+</sup> from Ac-ZVI. The AO7 degradation rate increased with increasing PMS/PDS dosage due to the greater amount of ROS generated. The degradation rate in the PDS system decreased while the degradation rate in the PMS system increased with increasing pH due to the difference in the PDS and PMS activation mechanisms. On the basis of the radical scavenging study, sulfate radical was identified as the dominant ROS in both systems. The physicochemical properties of pristine and used Ac-ZVI were characterized, indicating that the used Ac-ZVI had an increased BET specific surface area due to the formation of Fe<sub>2</sub>O<sub>3</sub> nanoparticles during PMS/PDS activation. Nevertheless, both systems displayed good reusability and stability for at least three cycles, indicating that the systems are promising for pollutant removal.https://www.mdpi.com/1996-1944/14/18/5284zero-valent ironacid orange 7ferric ionsulfate radicalsperoxymonosulfateperoxydisulfate |
| spellingShingle | Wen-Da Oh Yeek-Chia Ho Mardawani Mohamad Chii-Dong Ho Rajiv Ravi Jun-Wei Lim Systematic Performance Comparison of Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxymonosulfate and Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxydisulfate Systems for Organics Removal Materials zero-valent iron acid orange 7 ferric ion sulfate radicals peroxymonosulfate peroxydisulfate |
| title | Systematic Performance Comparison of Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxymonosulfate and Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxydisulfate Systems for Organics Removal |
| title_full | Systematic Performance Comparison of Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxymonosulfate and Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxydisulfate Systems for Organics Removal |
| title_fullStr | Systematic Performance Comparison of Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxymonosulfate and Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxydisulfate Systems for Organics Removal |
| title_full_unstemmed | Systematic Performance Comparison of Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxymonosulfate and Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxydisulfate Systems for Organics Removal |
| title_short | Systematic Performance Comparison of Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxymonosulfate and Fe<sup>3+</sup>/Fe<sup>0</sup>/Peroxydisulfate Systems for Organics Removal |
| title_sort | systematic performance comparison of fe sup 3 sup fe sup 0 sup peroxymonosulfate and fe sup 3 sup fe sup 0 sup peroxydisulfate systems for organics removal |
| topic | zero-valent iron acid orange 7 ferric ion sulfate radicals peroxymonosulfate peroxydisulfate |
| url | https://www.mdpi.com/1996-1944/14/18/5284 |
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