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Rare earth-doped mixed Ni-Cu-Zn ferrites as an effective photocatalytic agent for active degradation of Rhodamine B dye

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Journal of Rare Earths 2024年第3期42卷 488-496,I0003页

作者： Swapnil A.Jadhav Sandeep B.Somvanshi Sudarshan S.Gawali Kranti Zakde K.M.Jadhav department of Physics Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad431004MaharashtraIndia School of Materials Engineering Purdue UniversityWest Lafayette 47906USA university department of Basic and Applied Sciences MGM UniversityAurangabad431003MaharashtraIndia

In this study, a series of Gd^(3+)-doped mixed Ni-Cu-Zn ferrites with composition of Zn_(0.5)Ni_(0.3)Cu_(0.2)Fe_(2-x)Gd_(x)O_(4)(x = 0, 0.025, 0.05, 0.075, 0.1) was prepared using self-ignition sol-gel method. The prepared nanoparticles with an average size ranging from 22 to 26 nm show a single-phase cubic structure belonging to the spinel matrix. A rise in the Gd^(3+)concentration leads to an increase in crystallite size and lattice parameter. In Fourier transform infrared spectra, two main absorption bands belonging to the spinel structure are observed. The high-frequency bands(v_(1)) represent the tetrahedral complex, while the lowfrequency bands(v_(2)) signify the octahedral complex. The optical bandgap of the nanoferrites is found within the range of 2.91 to 2.41 eV, depending on their size. The magnetic characteristics of the material,such as saturation magnetization and coercivity are significantly altered with the concentration of Gd^(3+)in the solution. Using Rhodamine B(RhB) as a model organic pollutant, an in-depth investigation of the photocatalytic activity of the compounds was carried out. The present outcomes show that adding an adequate amount of Gd^(3+)significantly enhances the number of hydroxyl radicals produced by the ferrite,in turn, increasing the photocatalytic activity of the material. Mechanism elucidated by scavenger studies reveals that ·OH and holes are the primary reactive radicals responsible for the degradation *** photocatalysts show an insignificant performance loss in five consecutive cycles. Thus, it is concluded that these photocatalysts are highly suitable for the remediation of dye-contaminated wastewater.

关键词： Gd^(3+)substitution Spinel ferrite Structural properties Magnetic properties Photocatalysis Rare earths

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Land Use Land Cover Analysis for Godavari Basin in Maharashtra Using Geographical Information System and Remote Sensing

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Journal of Geographic Information System 2024年第1期16卷 21-31页

作者： Pallavi Saraf Dattatray G. Regulwar department of Civil Engineering Dr. Babasaheb Ambedkar Marathwada University Aurangabad India department of Civil Engineering Government College of Engineering Aurangabad India

The dynamic transformation of land use and land cover has emerged as a crucial aspect in the effective management of natural resources and the continual monitoring of environmental shifts. This study focused on the land use and land cover (LULC) changes within the catchment area of the Godavari River, assessing the repercussions of land and water resource exploitation. Utilizing LANDSAT satellite images from 2009, 2014, and 2019, this research employed supervised classification through the Quantum Geographic Information System (QGIS) software’s SCP plugin. Maximum likelihood classification algorithm was used for the assessment of supervised land use classification. Seven distinct LULC classes—forest, irrigated cropland, agricultural land (fallow), barren land, shrub land, water, and urban land—are delineated for classification purposes. The study revealed substantial changes in the Godavari basin’s land use patterns over the ten-year period from 2009 to 2019. Spatial and temporal dynamics of land use/cover changes (2009-2019) were quantified using three Satellite/Landsat images, a supervised classification algorithm and the post classification change detection technique in GIS. The total study area of the Godavari basin in Maharashtra encompasses 5138175.48 hectares. Notably, the built-up area increased from 0.14% in 2009 to 1.94% in 2019. The proportion of irrigated cropland, which was 62.32% in 2009, declined to 41.52% in 2019. Shrub land witnessed a noteworthy increase from 0.05% to 2.05% over the last decade. The key findings underscored significant declines in barren land, agricultural land, and irrigated cropland, juxtaposed with an expansion in forest land, shrub land, and urban land. The classification methodology achieved an overall accuracy of 80%, with a Kappa Statistic of 71.9% for the satellite images. The overall classification accuracy along with the Kappa value for 2009, 2014 and 2019 supervised land use land cover classification was good enough to d

关键词： GIS Remote Sensing Land Use Land Cover Change Change Detection Supervised Classification

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Eco-friendly synthesis of benzimidazole derivatives using solid acid scolecite catalyst

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Chinese Chemical Letters 2010年第9期21卷 1053-1056页

作者： Lakshman S.Gadekar Balasaheb R.Arbad Machhindra K.Lande department of chemistry Dr.Babasaheb Ambedkar Marathwada University

A series of benzimidazole derivatives were synthesized expeditiously in good yields by condensation of 1,2-diaminobenzene and aromatic aldehydes in the presence of modified scolecite *** world wide availability,easy handling and reusability of catalyst,higher yields and shorter reaction times are the advantages of the present method.

关键词： Benzimidazole Ethanol Natural zeolite-scolecite

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Integrated Hydrological Modeling of the Godavari River Basin in Maharashtra Using the SWAT Model: Streamflow Simulation and Analysis

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Journal of Water Resource and Protection 2024年第1期16卷 17-26页

作者： Pallavi Saraf Dattatray Gangaram Regulwar department of Civil Engineering Dr. Babasaheb Ambedkar Marathwada University Aurangabad (M.S.) Aurangabad India department of Civil Engineering Government College of Engineering Aurangabad (M.S.) Aurangabad India

Hydrological modeling plays a crucial role in efficiently managing water resources and understanding the hydrologic behavior of watersheds. This study aims to simulate daily streamflow in the Godavari River Basin in Maharashtra using the Soil and Water Assessment Tool (SWAT). SWAT is a process-based hydrological model used to predict water balance components, sediment levels, and nutrient contamination. In this research, we used integrated remote sensing and GIS data, including Digital Elevation Models (DEM), land use and land cover (LULC) maps, soil maps, and observed precipitation and temperature data, as input for developing the SWAT model to assess surface runoff in this large river basin. The Godavari River Basin under study was divided into 25 sub-basins, comprising 151 hydrological response units categorized by unique land cover, soil, and slope characteristics using the SWAT model. The model was calibrated and validated against observed runoff data for two time periods: 2003-2006 and 2007-2010 respectively. Model performance was assessed using the Nash-Sutcliffe efficiency (NSE) and the coefficient of determination (R2). The results show the effectiveness of the SWAT2012 model, with R2 value of 0.84 during calibration and 0.86 during validation. NSE values also ranged from 0.84 during calibration to 0.85 during validation. These findings enhance our understanding of surface runoff dynamics in the Godavari River Basin under study and highlight the suit-ability of the SWAT model for this region.

关键词： Soil and Water Assessment Tool (SWAT) Streamflow Hydrological Modeling Rainfall Runoff

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Boric acid as an efficient catalyst for the synthesis of 1,1-diacetate under solvent-free condition

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Chinese Chemical Letters 2009年第12期20卷 1453-1456页

作者： K.F Shelke S.B.Sapkal G.K.Kakade P.V.Shinde B.B.Shingate M.S.Shingare Organic Research Laboratory Department of ChemistryDr.Babasaheb Ambedkar Marathwada University

Boric acid （BO3H3） is an inexpensive, efficient and mild catalyst for the synthesis of 1,1-diacetate （acylal） from the various aromatic and heteroaryl aldehydes with acetic anhydride at room temperature under solvent-free condition. The present method does not involve any hazardous organic solvents or catalysts. This method gives notable advantages such as excellent chemoselectivity, mild reaction condition, short reaction times and excellent yield.

关键词： Aromatic and heteroaryl aldehyde Boric acid 1,1-Diacetate Solvent-free

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l-Hexanesulphonic acid sodium salt promoted the one-pot synthesis of amidoalkyl naphthols under microwave-irradiation

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Chinese Chemical Letters 2011年第5期22卷 551-554页

作者： Kirti S.Niralwad Bapurao B.Shingate Murlidhar S.Shingare Organic Research Laboratory Department of ChemistryDr.Babasaheb Ambedkar Marathwada University

Amidoalkyl naphthols have been synthesized in high yields in the presence of 1-hexanesulphonic acid sodium salt as an inexpensive solid catalyst under solvent-free conditions and *** catalyst provides clean conversion... 详细信息

关键词： Aldehydes Naphthols 1-Hexanesulphonic acid sodium salt Amidoalkyl naphthols Microwave-irradiation

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Greener approach towards the facile synthesis of 1,4-dihydropyrano[2,3-c]pyrazol-5-y1 cyanide derivatives at room temperature

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Chinese Chemical Letters 2010年第10期21卷 1175-1179页

作者： Ravi S.Balaskar Sandip N.Gavade Madhav S.Mane Bapurao B.Shingate Murlidhar S.Shingare Dhananjay V.Mane Organic Research Laboratory department of chemistry Dr.Babasaheb Ambedkar Marathwada University

This report describes triethylammonium acetate （TEAA） ionic liquid catalyzed one pot synthesis of 6-amino-4-aryl-5-cyano-3- methyl-1-phenyl-1,4-dihydropyrano [2,3-c]pyrazoles by the reaction of aromatic aldehyde, malononitrile and 3-methyl-1-phenyl-2- pyrazolin-5-one at room temperature. TEAA plays dual role as reaction media and catalyst. It can also be easily recovered and reused in several runs. TEAA provides greener reaction protocol to present methodology which obviates the need of organic solvents, expensive and toxic catalyst.

关键词： Triethylammonium acetate (TEAA) 1,4-Dihydropyrano[2,3-c]pyrazol-5-yl cyanides Room temperature

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Polyethylene glycol(PEG) mediated expeditious synthetic route to 1,3-oxazine derivatives

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Chinese Chemical Letters 2011年第8期22卷 915-918页

作者： Pravin V.Shinde Amol H.Kategaonkar Bapurao B.Shingate Murlidhar S.Shingare department of chemistry Dr.Babasaheb Ambedkar Marathwada UniversityAurangabad 431004MaharashtraIndia

Various 1,3-oxazine derivatives were synthesized in high yields,within shorter reaction times using PEG-400 as a safer medium/ *** synthetic route is exceedingly easy and avoids the use of acid/base catalysts.

关键词： Ecofriendly synthetic protocol Green chemistry 1 3-Oxazines Polyethylene glycol(PEG)

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Thiamine hydrochloride(VB1):An efficient catalyst for one-pot synthesis of α-aminophosphonates under ultrasonic irradiation

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Chinese Chemical Letters 2011年第5期22卷 563-566页

作者： Priyanka G.Mandhane Ratnadeep S.Joshi Deepak R.Nagargoje Charansingh H.Gill department of chemistry Dr.Babasaheb Ambedkar Marathwada UniversityAurangabadMaharashtra 431004India

An efficient synthesis of novelα-aminophosphonates by the reaction of aldehydes and amines with triethyl phosphite in the presence of the easily available,inexpensive,and nontoxic catalyst thiamine hydrochloride（VB1）.This method affords theα-aminopho-sphonates under the influence of ultrasound irradiation in aqueous medium,in short reaction times（4-6 min）,high yields（85-95%）, with improved *** process is green,mild,inexpensive and excellent yields are the main compensation of this procedure.

关键词： Thiamine hydrochloride(VB1) α-Aminophosphonates Triethyl phosphate Water Ultrasonication Green synthesis

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Potassium dihydrogen phosphate catalyzed one-pot synthesis of 2,4,5-triaryl-1H-imidazoles

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Chinese Chemical Letters 2010年第4期21卷 429-432页

作者： Ratnadeep S.Joshi Priyanka G.Mandhane Mohammad U.Shaikh Rajesh P.Kale Charansingh H.Gill department of chemistry Dr.Babasaheb Ambedkar Marathwada UniversityAurangabadMaharashtra 431 004India

A simple and efficient method has been developed;benzil/benzoin undergoes smooth condensation with various substituted aldehyde and ammonium acetate in the presence of potassium dihydrogen phosphate（KH;PO;） under mild reaction conditions to afford the corresponding trisubstituted imidazole in excellent *** method for synthesis of product,the reaction mixture was reflux in ethanol for 40-90 *** present method is simple,efficient,and cost-effective.

关键词： Potassium dihydrogen phosphate(KH_2PO_4) 2 4 5-Triaryl-1H-imidazole Benzil Benzoin Aldehyde Ammonium acetate

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