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Multifunctional Zn0.3Al0.4O4.5 crystals: An efficient photocatalyst for formaldehyde degradation and EBT adsorption
Affiliation:1. Department of Chemistry, Bhusawal Arts, Science and P.O. Nahata Commerce College, Bhusawal, Jalgaon 425201 (M.H.), India;2. School of Environmental and Earth Sciences, Kavayitri Bahinabai Chaudhari North Maharashtra University, Jalgaon 425001 (M.H.), India;3. Department of Applied Chemistry, Providence University, Shalu, Taichung 433, Taiwan;4. Applied Science Section, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202 002, India;5. Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia;6. Department of Chemistry, D. D. N. Bhole College, Bhusawal, Jalgaon 25201 (M.H.), India
Abstract:The Zn0.3Al0.4O4.5 nanoparticles (ZnAlONPs) with size of 70–90 nm are used as an efficient photocatalyst for formaldehyde (HCHO) degradation and effective adsorbent for the removal of eriochrome black-T (EBT) dye from synthetic aqueous solution. Degradation of HCHO reactions were studied using TiO2 (homemade), TiO2 (P-25) and ZnAlONPs by irradiating under 18 W daylight lamp source for photocatalytic degradation. The HCHO degradation rate is about 67, 76 and 89% for TiO2 (homemade), TiO2 (P25) and ZnAlONPs during 2 h reaction, respectively at initial formaldehyde gas concentration of 20 ppm. Maximum adsorption capacity was optimized by changing the parameters such as pH, EBT concentration and adsorbent dosage. A  200 mg of ZnAlONPs are useable for quick removal of EBT (>95%). Langmuir isotherm model showed a maximum adsorption capacity of 90.90 mgg−1. The ZnAlONPs could be successfully reused upto 5th adsorption/desorption cycle for EBT dye removal from water samples.
Keywords:ZnAlONPs  HCHO degradation  Eriochrome black T  Pseudo second order model  Langmuir isotherm
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