Nanocomposite of magnesium ferrite and manganese oxide as polyphenol oxidase mimic and photocatalyst
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Date
2022
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Punjab Agricultural University, Ludhiana
Abstract
Artificial enzymes have received immense interest due to their exceptional properties such as high stability and low-cost. Polyphenol oxidase enzyme mimic is well known for its contribution in the field of food industry, biosensors, medicine and water remediation. In the present study, Mn3O4 and MgFe2O4 nanoparticles and nanocomposites were synthesized by sol-gel and ultra-sonication methods. Their polyphenol oxidase (PPO) mimic activity was comparatively analyzed. The synthesized nanoparticles and nanocomposites were characterized by FT- IR, XRD, SEM-EDS, BET, and VSM. The results revealed that MgFe2O4@Mn3O4 possess unique catalytical features. XRD analysis of synthesized materials depicted crystalline nature. The PPO-like activity of synthesized NPs and NCs were analyzed using catechol and resorcinol as substrates. MgFe2O4@Mn3O4(1:2) were observed to be the best PPO mimic. Kinetic analysis under optimized conditions indicated higher binding affinity of nanocomposite as compared to pristine manganese oxide. MgFe2O4@Mn3O4 (2:1) showed to be best photocatalytic potential for catechol and resorcinol degradation in aqueous solution. The efficiency of degradation was put to the test in relation to the variation of several experimental parameters including: pH; nanoparticles dose and contact time These aforementioned parameters were optimized and examined for the influence that they exerted on the efficiency of degradation which involved the usage of the Box-Behnken design methodology. According to the ANOVA results that yielded a confidence level of 95 %, a high regression along with fitting values were obtained between the results of the experimental degradation of catechol and resorcinol and the predicted quadratic model. Thus, the present study indicated that a catalyst of MgFe2O4@Mn3O4 nanocomposite in different ratios have promising performance as photocatalyst and PPO-mimic for degradation of polyphenols.
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Harmilan Kaur (2022) Nanocomposite of magnesium ferrite and manganese oxide as polyphenol oxidase mimic and photocatalyst