Hydrogeochemical assessment of Ramsar wetland sites in Gujarat, India using environmetric techniques Mukesh P. Chaudhari, Gh Ali, Mostafa M. Basheir, Ruchi Nair, Divya R. Mishra, Pranav S. Shrivastav Cleaner Water, 2025 Ramsar wetlands are essential ecosystems that play a vital role in supporting biodiversity and maintaining water balance, making them ecologically and hydrologically significant. The study was conducted at four such sites in Gujarat — Khijadia, Nal Sarovar, Thol, and Wadhvana — to determine the variability in water quality, the predominant geochemical processes, and their potential for irrigation and domestic use. Major ions and physicochemical parameters in 12 surface water samples (3 samples from each wetland) were analyzed. Findings demonstrate slightly alkaline waters throughout the locations, with very high EC and TDS in Khijadia and Nal Sarovar due to evaporation and the intrusion of saline waters. In contrast, Thol and Wadhvana demonstrated relatively higher quality, but with locally elevated fluoride levels (>1.5 mg/L). The Thol and Wadhvana were rated good, and Khijadia and Nal Sarovar were rated poor by the Canadian WQI. High salinity hazards in Nal Sarovar and overall suitability in Thol and Wadhvana were demonstrated using irrigation indices (SAR, RSC, MAR, and KR). Piper, Durov, and Gibbs diagrams revealed four facies: Khijadia (Mg-Cl), Nal Sarovar (Na-Cl), Thol (Na-Cl), and Wadhvana (Ca-Mg-Cl). PCA identified three components that accounted for more than 90 % of the total variance, with strong correlations among Na⁺–Cl⁻–Mg²⁺ that are associated with salinity and rock-water interactions, suggesting these are the most significant controls. Elevated Na⁺, Cl⁻, and F⁻ suggest potential health risks for drinking use. In general, Khijadia and Nal Sarovar represent saline systems, whereas Thol and Wadhvana are freshwater wetlands influenced by local hydrology and lithology. These lessons offer guidelines for monitoring and managing wetlands in semi-arid areas to sustain ecological and human health.
Effective photo-catalytic degradation of Malachite Green with water stable Cu based aliphatic di-carboxylate MOFs Hinaly Chandresh Bhasin, Divya Mishra Inorganic and Nano Metal Chemistry, 2025 Four different mesoporous Cu-MOFs named as Cu(Pima), Cu(Suba), Cu(Azla) and Cu(Seba) were prepared from aliphatic di-carboxylate linkers with the dimeric Cu paddle wheels as Secondary Building Units (SBUs). These as-synthesized aliphatic Cu-MOFs were applied as fresh heterogeneous catalysts for the catalytic wet peroxide oxidation of simulated Malachite Green waste-water and characterized using PXRD, FT-IR, Fe-SEM and BET. The results exhibited a better catalytic degradation efficiency of Cu(Seba) and Cu(Azla) (>90% in 200 mins) as compared to Cu(Pima) and Cu(Suba). It was established that degradation efficiency of Cu(seba) was approximately 9.8 times better than the rest of the synthesized Cu(MOFs). It was recognized that increasing the organic linker length can evidently boost the dye degradation process. Under optimum conditions, the degradation efficiency of 98% and 97% for Cu(Seba) and Cu(Azla) were achieved respectively. A optimal condition of 1.0 mL H2O2, 50 °C temperature and 3.5 pH was obtained. A recyclability experiment of four runs was performed for Cu(Seba) and Cu(Azla) which exhibited they maintained an effective degradation efficiency of ∼80% simulated MG solution. These analytical results of the degradation efficiency for Cu(Seba) and Cu(Azla) led us on a conclusion that, as synthesized Cu-MOFs outperformed several other reported MOFs, nanoparticles, adsorbents etc., as heterogeneous catalysts in the field of dye degradation for wastewater treatment.
Multi-topic Carboxylates as Versatile Building Blocks for the Design and Synthesis of Multifunctional MOFs Based on Alkaline Earth, Main Group and Transition Metals Hinaly Bhasin, Priyanka Kashyap, Patrick Fernandes, Divya Mishra Comments on Inorganic Chemistry, 2023 Metal Organic Frameworks (MOFs), built from metal ions/clusters coordinated by organic linkers/bridging ligands, have emerged as an extensive class of crystalline hybrid materials with exceptional ultrahigh porosity and enormous internal surface areas. Out of several hallmarks possessed by MOFs, one is their topologically diverse and aesthetically pleasing framework structures which can be adjusted and tuned with the state-of-art techniques, and molecular simulations, different geometry, and connectivity of a linker to the respective metal cluster. In this critical review, we intend to highlight the scope of carboxylate-based MOFs by providing a varied range from their topology analysis and molecular simulations to different synthetic routes. Moreover, providing insights to reticular chemistry of carboxylate MOFs and the importance of Post-Synthetic Modification (PSM), an alternative route to introduce functional groups within these MOFs. We have also tried to identify the possible loopholes that can provide an extensive opportunity to young researchers that can lead to a detailed exploration in the field of novel MOFs.
CTV Based Sensor for the Detection of Ni2+ Ions With Real Sample Analysis Based on Mechanism of Fluorescence Along with Computational Insights Patrick F. Fernandes, Divya R. Mishra Journal of Fluorescence, 2022 Identification and detection of harmful contaminants such as nickel and other materials from soil and water is critical necessity at the present moment. So with this motive to detect and identify harmful pollutants, a novel cyclotriveratrylene based derivative was prepared for the detection and binding of harmful pollutants which had the properties of fluorescence. The newly derivative of Cyclotriveratrylene was found to be highly sensitive and selective towards Ni2+ ions. The complexation behaviour of this newly synthesised molecule was studied in presence of transition elements. Also computational methods such as docking, molecular modelling and DFT were used to study the molecular orbitals and energies of CTG-NBEP. The detection of Ni2+ from water samples were also carried out successfully.
