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40. Zinc Metal-Organic Framework Mimicking of Carbonic Anhydrase for Conversion of CO2 into Calcite.

Author

Nagababu, Penumaka, Kulkarni, Aditi, Chaudhari, Sachin D., and Rayalu, Sadhana S.

Subjects
CARBONIC anhydrase, METAL-organic frameworks, CARBON sequestration, CLIMATE change mitigation, ZINC, CALCITE
Abstract

Mineral carbonation in aqueous solutions presents a pragmatic avenue for tackling the challenges associated with carbon capture, utilisation, and storage, particularly in limiting global temperature rise to 1.5 °C for climate change mitigation. The urgency to engineer the removal of atmospheric CO2 has driven the exploration of innovative methods for direct conversion into valuable products, with a specific emphasis on calcite as a promising approach for carbon dioxide sequestration. This investigation focuses on the biomimetic strategy of emulating the catalytic activity of carbonic anhydrase by synthesizing a zinc-based metal-organic framework. The MOF, synthesized with Zinc as the central metal coordinated by 1,2,3-benzene tricarboxylic acid, displays noteworthy structural adaptability, diversity, and an extensive surface area. The characterisation of synthesised materials through UV DRS, XRD, XPS, FTIR, SEM, and Raman analyses corroborates its structural features. A comparative study with a Nickel-based MOF (Ni-BTC-MOF) underscores the advantages of zinc over nickel in CO2 mineralisation experiments. Remarkably, Zn-BTC-MOF demonstrates superior catalytic activity, reusability, solvent compatibility, and thermal stability compared to Ni-BTC-MOF. The Zn-BTC-MOF catalyst achieves a mineralisation yield of 25 mg, comparable with the reported results for natural carbonic anhydrase (34.92 mg) and imidazole-carbonic anhydrase (21.55 mg). The Zn-BTC-MOF catalyst displays exceptional reusability, maintaining CO2 mineralisation activity across over a broad pH and temperature range. These findings underscore the potential of Zn-BTC-MOF as an effective biomimetic catalyst for carbon dioxide mineralisation, holding promising applications in carbon capture and utilization technologies. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Occurrence of phthalates in facemasks used in India and its implications for human exposure.

Author

Shende, Nandini, Hippargi, Girivyankatesh, Gurjar, Suyog, Kumar, Asirvatham Ramesh, and Rayalu, Sadhana

Subjects
MEDICAL masks, ENDOCRINE diseases, CARCINOGENS, GOVERNMENT regulation, PLASTICIZERS, RISK assessment, COVID-19 pandemic, N95 respirators, ENVIRONMENTAL exposure, DISEASE risk factors
Abstract

Synthetic polymers with additives are used in the manufacturing of face masks (FMs); hence, FMs could be a potential source of exposure to phthalic acid esters (PAEs). India stands second in the world in terms of the FMs usage since the beginning of Covid-19 pandemic. However, little is known about the PAEs content of FMs used in India. Some PAEs, such as DEHP and DBP are suspected endocrine disrupting chemicals (EDCs); hence, wearing FM may increase the risk of exposure to these EDCs. In this study, we collected 91 samples of FMs from eight Indian cities and analyzed for five PAEs viz. DMP, DEP, DBP, BBP, and DEHP. The PAEs contents in FMs ranged from 101.79 to 27,948.64 ng/g. The carcinogenic risk of N 95 with filter, N-95, and cloth masks was higher than the threshold levels. The findings indicate the need to control PAEs in FMs through regulatory actions. [ABSTRACT FROM AUTHOR]

Published
2024
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