As water scarcity becomes an increasingly pressing issue, innovative solutions like atmospheric water harvesting (AWH) are being explored to provide sustainable access to fresh water. Dr Chinmoy Das, Assistant Professor from the Department of Chemistry and his research scholar Mr Sushant Wakekar have in their research paper titled, “Deciphering the functions of Metal-Organic Frameworks and their derived composites towards Atmospheric Water Harvesting: A comprehensive Review” analysed the crucial role of metal-organic frameworks (MOFs) and their composites in enhancing the efficiency of AWH systems.

Abstract

To address water scarcity globally, recently atmospheric water harvesting (AWH) has emerged as an intriguing and sustainable solution. This comprehensive review critically investigates how diversity in metal-organic frameworks (MOFs) and their composite materials shapes the effectiveness and practicality of AWH technologies. These materials range from pristine MOFs to functionalized MOFs-based composites to attain the sophisticated hydrophilic behavior to perform as water harvesters. The multifaceted effects of MOFs and their composite materials on the kinetics of sorption and condensation, the feasibility of water uptake and release, the overall performance of the materials, the theoretical understanding of water uptake, and various instrumentation techniques have been demonstrated in this comprehensive review. It contributes to the ongoing discourse on sustainable water sourcing by emphasizing the pivotal role of materials diversity in shaping the future of AWH technologies.

Explanation of Research in layperson’s terms:

This review article explains how AWH technology, which captures water from the air, could provide sustainable solutions for water scarcity. We focus on advanced materials called MOFs and their ability to improve AWH efficiency. By analyzing different types of MOFs and MOF-based composites, we explore how they enhance water absorption and release, potentially making AWH more practical and effective for real-world use.

Practical/Social Implications of the Research:

This technology could have far-reaching social impacts by offering a reliable water source for communities in arid or remote areas, reducing reliance on traditional, often costly water sources, and strengthening resilience to climate change.

Future Research Plans:

To design and synthesis a material which can work with a minimum relative humidity (%RH) and design a suitable prototype for it.

Link to the Article

https://www.sciencedirect.com/science/article/pii/S2214993724003002

Surface-Enhanced Raman Spectroscopy (SERS), a technique that helps scientists detect tiny amounts of substances, is used for checking pollutants in our environment and the food we eat. However, using this method can be tricky because sometimes other substances can interfere. To overcome these challenges, scientists are working on better ways to prepare samples and analyse the data with a quick and easy way to find harmful pollutants called PFOSA in human urine, soil, and water using a fish scale-based substrate. This remarkable research titled, “Ag nanoparticle-embedded fish scales as SERS substrates for sensitive detection of forever chemical in real samples” by faculty members from the Department of Chemistry and Department of Biological Sciences, Dr J P Raja Pandiyan and Dr Anil K Suresh, along with their research scholars, Ms Jayasree K and Ms Arunima J, have opened up new avenues, demonstrating a significant advancement in the field of science.

Abstract:

Surface-enhanced Raman spectroscopy (SERS) has emerged as one of the most promising analytical tools in recent years due to its advantageous features such as high sensitivity, specificity, ease of operation, and rapid analysis. These attributes make SERS particularly well-suited for environmental and food analysis. However, detecting target analytes in real samples using SERS faces several challenges, including matrix interference, low analyte concentrations, sample preparation complexity, and reproducibility issues. Additionally, the chemical complexity of pollutants and environmental factors can impact SERS measurements. Overcoming these hurdles demands optimised experimental conditions, refined sample preparation methods, and advanced data analysis techniques, often necessitating interdisciplinary collaborations for effective analysis. Therefore, our focus lies in the development of various methods for fabricating SERS substrates, pretreating analytes, and devising sample preparation strategies. These efforts aim to enable the detection of analytes like Perfluorooctane sulfonamide (PFOSA) – a toxic environmental pollutant within complex real samples, including human urine, lake water, and soil samples.

Practical / Social Implications:

SERS Community: Introducing a facile fabrication method for developing filter paper-based substrates, utilizing evaporation-induced self-assembly methods with the aid of 96-well plates. These substrates boast exceptional sensitivity and uniformity, exhibiting a relative standard deviation (RSD) of 8.2%. They offer easy fabrication and serve as effective SERS substrates for various applications.

Industry and Government Bodies: This invention plays a pivotal role in assessing contamination in food and water bodies, serving as a crucial tool in monitoring
environmental contamination through on-site analysis with portable instruments. It ensures adherence to regulatory standards and safeguards public health.

Research: Beyond its practical applications, the invention supports scientific research endeavours focused on identifying microplastic contaminants in real-world samples using portable Raman spectrometers. This not only aids ongoing research but also paves the way for future studies in this critical field.

Collaborations:

1. Dr Hemanth Noothalapati Raman Project Center for
Medical and Biological
Applications, Shimane
University, Matsue 690-8504,
Japan

2. Dr Murali Krishna C. Advanced Centre for
Treatment, Research and
Education in Cancer, Tata
Memorial Centre, Navi
Mumbai 410210, India

3. Dr Soma Venugopal University of Hyderabad, India

Future Research Plans:

Harnessing SERS for the Detection of Emerging Contaminants in Environmental and Food Matrices

In a remarkable contribution to the field of green chemistry, Dr Jaidev Kaushik, Assistant Professor in the Department of Chemistry, has published a significant research paper titled “Green Light Promoted Photoreduction of Carbonate to Acetic Acid by Zinc Ash-Derived ZCu@ZnO” in the prestigious Q1 journal, ACS Sustainable Chemistry & Engineering, with an impressive impact factor of 7.1.

Dr Kaushik’s research addresses the pressing need for sustainable methods of producing acetic acid, a widely used chemical in various industrial applications. The study explores an innovative photoreduction process that utilises green light to convert carbonate compounds into acetic acid using a novel catalyst derived from zinc ash. This approach not only showcases the potential for an eco-friendly production method but also emphasises the recycling of zinc waste, turning a byproduct into a valuable resource.

The paper highlights the efficiency of Zinc Ash-Derived ZCu@ZnO as a catalyst in the photoreduction process, demonstrating its effectiveness under green light conditions. The findings could pave the way for more sustainable practices in chemical manufacturing, aligning with global efforts to reduce carbon emissions and promote environmentally friendly technologies.

This publication underscores the commitment of SRM University – AP to fostering innovative research that addresses contemporary environmental challenges. Dr. Kaushik’s work exemplifies the university’s focus on sustainability and its aspiration to lead in the field of scientific research.

As the demand for sustainable chemical processes grows, Dr Kaushik’s research will likely inspire further investigations and developments in green chemistry, contributing to a more sustainable future.

Abstract of the Research

Mineralized carbon (carbonate) is the readily available carbon dioxide (CO2) source in acidic aqueous conditions. The photoreduction of carbonate to value-added hydrocarbons could be a novel finding performed in the presence of monochromatic visible light and waste-derived photo-active nanomaterials. In this report, we have synthesized ZnO particles from the zinc ash generated as waste in the galvanization process in the steel industry; ZnO particles were decorated with CuO nanoparticles and then further activated by reducing them to get a heterojunction photocatalyst (ZCu@ZnO). After that, ZCu@ZnO is utilized to photoreduce carbonate to acetic acid (AcOH) in a peroxy-rich solvent as a hydrogen-rich solvent under various monochromatic light sources and sunlight. Additionally, different physical and chemical parameters, such as solvent mixture, light sources, photocatalysts, time, etc., were optimized to get the maximum yield of AcOH under monochromatic light of 525 nm wavelength (Green light).

Explanation of the Research in Layperson’s Terms

This report is proposing the solution of two problem statements; first, utilization of zinc ash generated as a by-product after galvanization process; and second, cost-effective and energy efficient process for conversion of carbonates to value-added C2 hydrocarbon.

Practical Implementation and the Social Implications associated with the Research

The process adds value by converting low-value waste into high-value nanomaterials, potentially offering new revenue streams for recycling and waste management industries. It supports the principles of a circular carbon economy and green chemistry focusing on synthesis of hydrocarbons from carbonates.

Collaboration

Dr Sumit Kumar Sonkar (MNIT Jaipur, India)

Future Research Plans

1. The adsorption/photodegradation-assisted quick and efficient removal of next generation advanced pollutants such as microplastic, pesticides, pharmaceutical waste, etc. by hydrophobic carbon aerogel and their doped and functionalized versions.

2. Utilizing waste derived heterogeneous catalysts in organic transformation reactions.

3. Selective sensing of toxic metal ions/biomarkers/biomolecules using fluorescent nanomaterials.

4. Upcycling of carbonates/CO2 via photo/thermal assisted catalyzed reactions to get C1 and C2 hydrocarbons (green fuel).

Link to the Article

Dr Jaidev Kaushik, an Assistant Professor in the Department of Chemistry, has recently published a pioneering research paper in the prestigious journal Langmuir (ACS). The paper, titled “Graphene Incorporated Sugar-derived Carbon Aerogel for Pyridine Adsorption and Oil-Water Separation,” explores innovative applications of graphene-based materials.

Dr Kaushik’s research focuses on the development of a novel carbon aerogel derived from sugar and incorporated with graphene. This material demonstrates exceptional efficiency in adsorbing pyridine, a harmful organic compound, and effectively separating oil from water. These findings hold significant promise for environmental remediation and industrial applications, offering a sustainable solution to pollution and waste management challenges.

The publication of this paper in Langmuir highlights the cutting-edge research being conducted at SRM University-AP and underscores Dr Kaushik’s contributions to the field of chemistry. His work not only advances scientific understanding but also paves the way for practical applications that can benefit society at large.

Abstract

In this report, we have synthesized three-dimensional and hydrophobic graphene-incorporated carbon aerogel (G-SCA) derived from sugar. G-SCA is being used as a multifunctional sorbent material for removing various advanced water soluble and insoluble pollutants Initially, G-SCA is being explored for the adsorption of nitrophenols, nitroaromatics (3-nitroaniline), insecticide (Phoskill), antibiotic (ciprofloxacin), and pharmaceutical drug precursor (pyridine). Later, same G-SCA is also explored in the absorption of various protic and aprotic organic solvents and oils (including crude oil, waste cooking oil, and waste Mobil oil), with excellent recyclability checked up to 10 cycles. Moreover, oil-water separation experiments are also being done in various industrial wastewater samples and seawater to support the real-life accessibility of present approach. Large-scale applicability of G-SCA is also checked by performing crude oil-seawater separation experiments using a laboratory-scale prototype demonstrating the successful continuous recovery of crude oil.

Explanation of The Research in Layperson’s Terms

This research demonstrates the synthesis of carbon aerogel from edible sugar followed by the incorporation of graphene oxide to make a near superhydrophobic and good water-floating sorbent material. Later, this sorbent material was used to decontaminate wastewater from advanced pollutants such as explosive wastes, expired antibiotics, pharmaceutical waste, insecticides, etc. This report also showed the practical demonstration of crude oil recovery from seawater, thus contributing to the circular economy process.

Title of Research Paper in the Citation Format

F. Agrawal, K. Gupta, J. Kaushik, K. M. Tripathi, S. K. Choudhary, S. K. Sonkar, Graphene Incorporated Sugar Derived Carbon Aerogel for Pyridine Adsorption and Oil–Water Separation, Langmuir 2024, 40, 18028–18038.

Practical Implementation or the Social Implications Associated with the Research

This work describes the synthesis of low-cost near superhydrophobic carbon aerogel, displaying its multiple applications in wastewater treatment from water-soluble and water-insoluble pollutants. It is also an alternative and cost-effective approach for recovering valuable oil and organic compounds from water rather than degrading or destroying them so they can be reused.

Collaborations

Dr Sumit Kumar Sonkar (MNIT Jaipur, India)

Future Research Plans

1. The adsorption/photodegradation-assisted quick and efficient removal of next generation advanced pollutants such as microplastic, pesticides, pharmaceutical waste, etc. by hydrophobic carbon aerogel and their doped and functionalised versions.
2. Utilizing waste derived heterogeneous catalysts in organic transformation reactions.
3. Selective sensing of toxic metal ions/biomarkers/biomolecules using fluorescent nanomaterials.
4. Upcycling of carbonates/CO2 via photo/thermal assisted reactions to get C1 and C2 hydrocarbons (green fuel).

Link to the Article

The Department of Chemistry is glad to announce that Dr Rajapandiyan Panneerselvam, Associate Professor, Ms Jayasree K, Research Scholar, and Ms Mounika Renduchintala, BSc student, have had their breakthrough research published as a patent titled “A Method for Detecting Microplastics from Contaminated Products” with Application Number: 202441045388. Various research has been undertaken by scientists in developing improved methods for sample preparation and data analysis, aiming to reliably detect pollutants like microplastics in complex samples such as sea salt, soil, and water. In line with these efforts, this patent introduces a rapid and easy method to detect microplastics in contaminated products and water bodies using a filter paper-based substrate.

Abstract

Surface-enhanced Raman spectroscopy (SERS) has emerged as one of the most promising analytical tools in recent years due to its advantageous features, such as high sensitivity, specificity, ease of operation, and rapid analysis. These attributes make SERS particularly well-suited for environmental and food analysis. However, detecting target analytes in real samples using SERS faces several challenges, including matrix interference, low analyte concentrations, sample preparation complexity, and reproducibility issues. Additionally, the chemical complexity of pollutants and environmental factors can impact SERS measurements. Overcoming these hurdles demands optimized experimental conditions, refined sample preparation methods, and advanced data analysis techniques, often necessitating interdisciplinary collaborations for effective analysis. Therefore, our focus lies in the development of various methods for fabricating SERS substrates, pretreating analytes, and devising sample preparation strategies. These efforts aim to enable the detection of analytes like microplastics within complex real samples, including sea salts, soil samples, lake water, and various food products.

Practical Implementation/ Social Implications of the Research

SERS Community: Introducing a facile fabrication method for developing filter paper-based substrates, utilizing evaporation-induced self-assembly methods with the aid of 96-well plates. These substrates boast exceptional sensitivity and uniformity, exhibiting a relative standard deviation (RSD) of 8.2%. They offer easy fabrication and serve as effective SERS substrates for various applications.

Industry and Government Bodies: This invention plays a pivotal role in assessing contamination in food and water bodies, serving as a crucial tool in monitoring environmental contamination through on-site analysis with portable instruments. It ensures adherence to regulatory standards and safeguards public health.

Research: Beyond its practical applications, the invention supports scientific research endeavors focused on identifying microplastic contaminants in real-world samples using portable Raman spectrometers. This not only aids ongoing research but also paves the way for future studies in this critical field.

Collaborations

• Dr Hemanth Noothalapati – Raman Project Center for Medical and Biological Applications, Shimane University, Japan
• Dr Murali Krishna C – Advanced Centre for Treatment, Research and Education in Cancer, Tata Memorial Centre, Navi Mumbai, India
• Dr Soma Venugopal – University of Hyderabad, India

The research team hopes to develop a novel SERS substrate for the detection of environmental pollutants in real-world samples.

Dr Rajapandiyan P, Associate Professor, Department of Chemistry, and his PhD scholar, Ms Arunima Jinachandran, recently filed and published a patent, “A Substrate for Contaminant Detection and a Process for its Synthesis,” with Application Number: 202441043642 in the Patent Office Journal. The research duo has developed a novel SERS (Surface-Enhanced Raman Spectroscopy) substrate by synthesising silver nanopopcorn and depositing it on a polycarbonate membrane.

This novel substrate demonstrates excellent uniformity, reproducibility, and mechanical stability. It is used for the sensitive detection of toxic antibiotic nitrofurazone on fish surfaces and in honey. This breakthrough could significantly enhance food safety monitoring by providing a reliable and efficient method for detecting harmful substances.

Abstract

Detecting nitrofurazone (NFZ) in aquaculture and livestock is crucial due to its carcinogenic properties. This study presents a flexible polycarbonate membrane (PCM) with three-dimensional silver nanopopcorns (Ag NPCs) for NFZ detection on fish surfaces using surface-enhanced Raman spectroscopy (SERS). The Ag-NPCs/PCM substrate demonstrates a significant Raman signal enhancement (EF = 2.36 × 106) due to hotspots from nanoscale protrusions and crevices. It achieves a low limit of detection (LOD) of 3.7 × 10−9 M, with uniform and reproducible signals (RSD < 8.34%) and retains 70% efficacy after 10 days. The practical detection LODs for NFZ in tap water, honey water, and on fish surfaces are 1.35 × 10−8 M, 5.76 × 10−7 M, and 3.61 × 10−8 M, respectively, demonstrating its effectiveness for various samples. This Ag-NPCs/PCM substrate offers a promising approach for sensitive SERS detection of toxic substances in real-world applications.

Practical Implementation/ Social Implications of the Research

The practical applicability of the proposed Ag-NPCs/PCM SERS substrate is validated by successfully detecting NFZ in various actual samples, such as tap water, honey water, and irregular fish surfaces.

Collaborations – Prof. Tzyy-Jiann Wang – National Taipei University of Technology, Taiwan

Dr Rajapandiyan and Ms Arunima will continue to work towards the development of novel flexible SERS substrates for detecting toxic pollutants in food.

Dr Chinmoy Das, Assistant Professor at the Department of Chemistry at SRM University-AP, has made an impactful contribution with the publication of his research paper, “Insights into the Mechanochemical Glass Formation of Zeolitic Imidazolate Frameworks” in the prestigious Angewandte Chemie International Edition with an impact factor of 16.6. His paper unveils a rapid, eco-friendly, and efficient mechanochemical approach to transform glasses from their crystalline zeolitic imidazolate frameworks. This pioneering work opens new doors for sustainable and effective glass formation, showcasing the power of innovation in the field of chemistry.

Abstract:

We describe a rapid, ecofriendly, and efficient mechanochemical approach to transform glasses from their crystalline zeolitic imidazolate frameworks (ZIFs). We exposition mechanochemical technique through which the traditional melt-quench preparation of glassy phases can be replaced. In this study, we explore that Zn(II), Co(II), and Cu(II)- based crystalline ZIFs transformed into the glassy phases within five minutes through the mechanical ball milling technique. The appearance of glass transition temperature(T g ) upon mechanical milling of crystalline states demonstrated by different characterization techniques, such as X-ray powder diffraction (XRPD), differential scanning calorimetry (DSC), simultaneous thermogravimetric and differential thermal analyses (TG/DTA), scanning electron microscopy (SEM), X-ray total scattering and its deduced pair distribution functions (PDFs). We characterized the porosity and density of the glassy phases through CO 2 gas sorption techniques which aligned with the observation of thermal, structural, and textural features of the ZIFs after varying ball milling times beyond five minutes.

Practical implementation

We can prepare bulk ZIF glasses within five minutes of the mechanochemical approach that will guide the greater feasibility to produce the glass materials for industrial implications. In addition, the greater the accessibility of glassy materials, the greater the fabrication of glassy materials-based device fabrication.

Collaborations

This article has been published with the collaboration of Prof. Sebastian Henke (Henke Group), Department of Chemistry and Chemical Biology, TU Dortmund University, Dortmund, Germany.

Future Research Plans

Recently, we established our research group in SRM University-AP, and our group has started to explore an emergent research area of crystal-glass composite materials towards the applications of atmospheric water harvesting, solid-state electrolytes (Alkali and Alkaline metal ions-based), photovoltaics, and conversion of gaseous Carbon-dioxide molecules to industrially relevant liquids, such as methanol or ethanol.

• Figure 1. (A) Single crystal structures of various ZIFs indicated in the figure. (B) Schematic representation of the traditional route to ZIF glass formation (red line) and the mechanochemical vitrification approach followed in this work (blue line). (C) PXRD patterns of the pristine ZIF polycrystalline materials and after five minutes of mechanical ball milling.