Application of Catalytic Ozonation Process Using a Novel Fe3O4/Mg(OH)2/4A-Zeolite Catalyst for Swift Treatment of Dairy Effluent

• Published in: Journal of inorganic and organometallic polymers and materials 2021, Vol.31 (7), p.2818-2830
• Main Authors: Hajipour, Akbar, Derakhshanfard, Fahimeh, Mehrizad, Ali, Amirkhani, Leila
• Format: Article
• Language: English
• Subjects: Catalysts; Chemistry; Chemistry and Materials Science; Effluents; Endothermic reactions; Feasibility studies; Hydroxyl radicals; Inorganic Chemistry; Iron oxides; Nanoparticles; Organic Chemistry; Ozone; Polymer Sciences; Response surface methodology; Thermodynamics; Wastewater treatment; Zeolites
• ISSN: 1574-1443; 1574-1451
• DOI: 10.1007/s10904-021-01904-7

The present study investigated the feasibility of employing a catalytic ozonation process by a novel Fe 3 O 4 /Mg(OH) 2 /4A zeolite catalyst to facilitate the treatment of real dairy effluent. The Fe 3 O 4 /Mg(OH) 2 magnetic nanoparticles supported onto 4A zeolite (Fe 3 O 4 /Mg(OH) 2 /4AZ) were synthesized and characterized by extensive techniques (XRD, FE-SEM, TEM, EDS, VSM, and BET). Reaction rate, operating conditions, mechanism, and thermodynamics of the dairy effluent treatment by the Fe 3 O 4 /Mg(OH) 2 /4AZ-catalyzed ozonation process were investigated. Catalytic ozonation experiments indicated that synchronous use of Fe 3 O 4 /Mg(OH) 2 /4AZ and O 3 considerably accelerated the rate of COD reduction, compared to sole ozonation. Results of the designed experiments by response surface methodology (RSM) revealed that approximately 80% of COD was reduced within 30 min at natural pH of solution (≈ 7) when the catalyst and ozone dosages were 5 g L −1 and 9 mg min −1 , respectively. Exploration of the mechanism disclosed that the process mainly followed a hydroxyl radical reaction pathway. Thermodynamics studies demonstrated that the process was endothermic and temperature sensitive, so that it was spontaneous at the temperature of 313 K. Overall, this study supplies a bold and quick manner as well as environmental friendliness (no secondary pollution) to eradicate refractory substances and wastewater treatment.