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Solvent extraction of neodymium(Ⅲ) from acidic nitrate medium using Cyanex 921 in kerosene

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Journal of Rare Earths 2012年第8期30卷 794-797页

作者： Nandita Panda Niharbala Devi sujata mishra Department of Chemistry Institute of Technical Education and Research Siksha 'O' Anusandhan deemed to be University

The extraction of neodymium（III） from acidic nitrate medium was investigated using Cyanex 921 as extractant in kerosene. The metal concentration in the aqueous phase before and after extraction was determined spectrophotometrically by Arsenazo III method. The complete equilibration was achieved in 15 rain. The effects of shaking time, nitric acid concentration, nitrate concentration, extractant concen- tration, and temperature on the extraction were studied. The extraction of Nd（III） was found to increase very slowly with increase in concen- tration of HNO3 in the range of 0.001-3.008 mol/L and then decreased when 0.01 mol/L HNO3 was used. The percentage of extraction was increased with increase in nitrate concentration from 0.01M）.45 mol/L and then decreased when nitrate concentration increased to 0.5 mol/L. Quantitative extraction of Nd（III）（98%） was obtained from the aqueous phase containing 0.001 mol/L HNO3 and 0.1 mol/L KNO3 using 0.5 mol/L Cyanex 921. On the basis of slope analysis, the extracted complex in the organic phase was proposed to be Nd（NO3）3.2Cyanex 921. The extraction of Nd（III） was found to increase with increase in concentration of metal ion in the range of 0.0014）.05 mol/L from 0.001 mol/L HNO3 and 0.1 mol/L KNO3 with 0.1 mol/L Cyanex 921. The percentage of extraction of neodymium was found to decrease with in- crease in temperature. From temperature variation studies, the negative value of AH indicated the extraction reaction to be exothermic and the negative value of AS indicated the formation of a stable complex, Almost 100% Nd（III） was recovered from the fully loaded organic phase using 0.002 mol/L H2SO4 and 0.01 mol/L HCl.

关键词： extraction neodymium(III) acidic nitrate Cyanex 921 kerosene stripping rare earths

Separation of copper and iron from chloride media using Cyanex 921 in kerosene

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Journal of Central South University 2014年第5期21卷 1752-1755页

作者： Sanghamitra Pradhan Niharbala Devi sujata mishra Department of Chemistry Institute of Technical Education and ResearchSiksha'O'Anusandhan University

The extraction and separation of Cu(Ⅱ)and Fe(Ⅲ)from HCl media using Cyanex 921 in kerosene were *** effect of shaking time,aqueous phase acid concentration,Fe(Ⅲ)/Cu(Ⅱ)concentration,Cyanex 921 concentration,temperature and aqueous to organic phase ratio on the separation of Cu(Ⅱ)and Fe(Ⅲ)was studied using 0.1 mol/L Cyanex 921 in *** separation was achieved from 2 mol/L HCl containing 0.001 mol/L Cu(Ⅱ)and 0.005 mol/L Fe(Ⅲ)with 0.1 mol/L Cyanex 921 in *** separation of copper and iron was also possible from 5 mol/L HCl using 0.02 mol/L Cyanex 921.

关键词： Cyanex 分离煤油介质氯化物铁铜 mol

DEHPA在Petrofin中萃取分离La(Ⅲ)和Ni(Ⅱ)的动力学与机理（英文）

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Transactions of Nonferrous Metals Society of China 2019年第7期29卷 1538-1548页

作者： Swagatika SATPATHY sujata mishra Department of Chemistry Institute of Technical Education and ResearchSiksha ‘O’ Anusandhan Deemed to be University

采用界面积恒定的连续搅拌萃取池,研究在乳酸存在条件下,以用Petrofin 稀释的二-2-乙基己基磷酸(DEHPA)作萃取剂从硝酸盐介质中萃取分离La(Ⅲ)与Ni(Ⅱ)的动力学。考察搅拌速度、界面积、pH 值、乳酸浓度、萃取剂浓度、金属离子浓度和温... 详细信息

采用界面积恒定的连续搅拌萃取池,研究在乳酸存在条件下,以用Petrofin 稀释的二-2-乙基己基磷酸(DEHPA)作萃取剂从硝酸盐介质中萃取分离La(Ⅲ)与Ni(Ⅱ)的动力学。考察搅拌速度、界面积、pH 值、乳酸浓度、萃取剂浓度、金属离子浓度和温度对萃取速率的影响。结果表明,该萃取体系是受扩散控制的,界面反应为速率控制步骤。两种金属离子的萃取速率均与pH 值无关。La(Ⅲ)和Ni(Ⅱ)的萃取速率与乳酸浓度和金属离子(La(Ⅲ)或Ni(Ⅱ))浓度呈线性关系。La(Ⅲ)的萃取速率与DEHPA 浓度呈线性关系,而Ni(Ⅱ)的萃取速率则与DEHPA 浓度的1.5 次方呈线性关系。在低界面积和低搅拌速度的条件下,从硝酸盐溶液中分离La(Ⅲ)和Ni(Ⅱ)是可行的。

关键词：萃取分离动力学机理 La(Ⅲ) Ni(Ⅱ)

Binary Mixture of Tri-Octyl Amine and Cyanex 923 as Extractant for the Extraction of Zr (IV) from Acidic Chloride Medium

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International Journal of Nonferrous Metallurgy 2014年第2期3卷 9-17页

作者： Bhikari Charan Bhatta sujata mishra Department of Chemistry College of Engineering and Technology Bhubaneswar Odisha Department of Chemistry Institute of Technical Education and Research Siksha 'O’ Anusandhan Deemed to be University Bhubaneswar Odisha India

The extraction of zirconium (IV) from aqueous HCl solution by binary mixture TOA and Cyanex 923 using kerosene as diluent was studied. The effect of parameters like aqueous phase acid concentration, extractant concentration, chloride ion concentration, diverse ion effect, metal loading, nature of diluents and temperature on the extraction of Zr (IV) was investigated. The percentage of extraction of Zr(IV) became 100% with 0.1 M TOA and 0.01 M Cyanex 923 from 7 M HCl and also from 4 M HCl with 0.1 M TOA and 0.02 M Cyanex 923. Benzene was found to be effective diluent for the extraction of Zr(IV) with binary mixture of TOA and Cyanex 923. The positive enthalpy change and positive entropy change in the binary extraction system show endothermic process with increase in randomness. Stripping of Zr (IV) from the loaded organic phase containing mixture of TOA (0.1 M) and Cyanex 923 (0.01 M) indicated that HNO3 and Na2CO3 are the best stripping agents.

关键词： Zirconium Solvent Extraction Hydrochloric Acid TOA Cyanex 923 Kerosene

Increase in Organochlorine Contaminant Levels in Major Water Sources of the United States in Response to the Coronavirus Pandemic

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Journal of Biosciences and Medicines 2024年第5期12卷 111-143页

作者： Wendy Wilburn sujata Guha Ryan Beni Department of Biological Sciences Tennessee State University Nashville TN USA Department of Chemistry Tennessee State University Nashville TN USA

Organochlorine contaminants, such as triclosan (TCS), are present in major water sources across the United States. These antimicrobial compounds are widely used as multipurpose ingredients in everyday consumer products. They can be ingested or absorbed through the skin and are found in human blood, breast milk, and urine samples. Studies have shown that the increased use of antimicrobial agents leads to their presence and persistence in the ecosystem, particularly in soil and watersheds. Many studies have highlighted emerging concerns associated with the overuse of TCS, including dermal irritations, a higher incidence of antibacterial-related allergies, microbial resistance, disruptions in the endocrine system, altered thyroid hormone activity, metabolism, and tumor metastasis and growth. Organochlorine contaminant exposures play a role in inflammatory responsiveness, and any unwarranted innate response could lead to adverse outcomes. The capacity of TCS and other organochlorine contaminants to induce inflammation, resulting in persistent and chronic inflammation, is linked to various pathologies, such as cardiovascular disease and several types of cancers. Chronic inflammation presents a severe consequence of exposure to these antimicrobial agents, as any changes could result in the loss of immune competence. Organochlorine contaminant levels were established by the United States Environmental Protection Agency (EPA) in 2019-2020 and have consistently increased in response to the novel coronavirus (nCoV) (COVID-19) pandemic. Our previous research examined the overuse of products containing triclosan (TCS), which led to an increase in total trihalomethane (TTHM) levels affecting the quality of our water supply. We also investigated the impact of the FDA ban that now requires pre-market approval. To comprehend the consequences of excessive antimicrobial use on water quality, we conducted an analysis of the levels of total trichloromethane (chloroform), a byproduct of

关键词： Organochlorine Contaminants Triclosan Trihalomethane Chloroform Water Quality

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预测翻车华尔街错在哪儿了?

商业周刊（中文版） 2024年第1期 20-21页

作者： Alexandra Semenova Sagarika Jaisinghani Liz Capo McCormick Selcuk Gokoluk Ye Xie sujata Rao-Coverley Matt Turner 孟洁冰(译) 不详

回顾2022年底,不管是股票部门还是债券部门,无论是大公司还是小机构,整个华尔街的气氛都很低落。当时似乎大家都在未雨绸缪,认为经济衰退即将到来。在摩根士丹利(Morgan Stanley),看跌美股的策略师迈克·威尔逊(Mike Wilson)迅速成为市... 详细信息

回顾2022年底,不管是股票部门还是债券部门,无论是大公司还是小机构,整个华尔街的气氛都很低落。当时似乎大家都在未雨绸缪,认为经济衰退即将到来。在摩根士丹利(Morgan Stanley),看跌美股的策略师迈克·威尔逊(Mike Wilson)迅速成为市场宠儿,他预测标准普尔500指数即将大跌。

关键词：摩根士丹利经济衰退标准普尔500指数美股华尔街债券股票未雨绸缪

MSCs derived extracellular vesicles as a therapeutic paragon for neurodegenerative disorders:A viewpoint

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BIOCELL 2022年第6期46卷 1435-1438页

作者： YASHVI SHARMA SHARDA RAY sujata MOHANTY Stem Cell Facility(DBT-Centre of Excellence for Stem Cell Research) All India Institute of Medical SciencesNew DelhiIndia Jawaharlal Nehru Medical College KarnatakaIndia

Neurodegenerative disorders are a vicious woe to the public health and *** in their underlying causes,lack of effective biomarkers for their early detection,existence of only supportive therapy,and their ever rising incidence creates an unmatched need for targeted *** Stem Cells(MSCs)have found to be promising candidates for regenerative and remedial therapy in neurodegenerative disorders,however several biological risks and practical issues impede in their translational *** from MSCs are certain Extracellular Vesicles(EVs),which aid in the paracrine action of MSCs and have lately gained the scientific interest for their implacability in diverse set *** cargo is of utmost importance and is being explored in various different diseases like heart diseases,neuronal diseases,respiratory diseases and hepatic *** thereby hold the position of a likely prospective remedial candidate for therapy against neurodegenerative disorders.

关键词： Mesenchymal stem cells Extracellular vesicles Neurodegenerative disorders Cell-free therapy Regeneration

Swarm Optimization and Machine Learning for Android Malware Detection

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Computers, Materials & Continua 2022年第12期73卷 6327-6345页

作者： K.Santosh Jhansi P.Ravi Kiran Varma sujata Chakravarty Centurion University of Technology and Management ParalakhemundiOdishaIndia Maharaj Vijayaram Gajapathi Raj College of Engineering VizianagaramIndia Centurion University of Technology and Management BhubaneswarOdishaIndia

Malware Security Intelligence constitutes the analysis of applications and their associated metadata for possible security *** Programming Interfaces(API)calls contain valuable information that can help with malware *** malware analysis with reduced feature space helps for the efficient identification of *** goal of this research is to find the most informative features of API calls to improve the android malware detection *** swarm optimization methods,viz.,Ant Lion Optimization(ALO),Cuckoo Search Optimization(CSO),and Firefly Optimization(FO)are applied to API calls using auto-encoders for identification of most influential *** nature-inspired wrapperbased algorithms are evaluated using well-known Machine Learning(ML)classifiers such as Linear Regression(LR),Decision Tree(DT),Random Forest(RF),K-Nearest Neighbor(KNN)&SupportVector Machine(SVM).A hybrid Artificial Neuronal Classifier(ANC)is proposed for improving the classification of android *** experimental results yielded an accuracy of 98.87%with just seven features out of hundred API call features,i.e.,a massive 93%of data optimization.

关键词： Android malware API calls auto-encoders ant lion optimization cuckoo search optimization firefly optimization artificial neural networks artificial neuronal classifier

Participant attrition and perinatal outcomes in prenatal vitamin Dsupplemented gestational diabetes mellitus patients in Asia: A metaanalysis

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World Journal of Methodology 2022年第3期12卷 164-178页

作者： Sumanta Saha sujata Saha Department of Community Medicine R.G.Kar Medical CollegeKolkata 700004West BengalIndia Department of Mathematics Mankar CollegeMankar 713144West BengalIndia

BACKGROUND The role of vitamin D supplementation in gestational diabetes mellitus(GDM)patients is *** To determine the burden and risk of post-randomization GDM patient attrition from vitamin D-supplemented arms of randomized controlled trials(RCTs).The auxiliary aim was to compare the effects of nutritional supplements on their fasting blood glucose(FPG)levels and perinatal *** RCTs were searched in the PubMed,Embase,and Scopus *** prevalence and pairwise meta-analysis were performed for the primary *** auxiliary aim was to compare the effects of nutritional supplements on their fasting blood glucose(FPG)levels and perinatal ***-effect network meta-analyses were undertaken for the secondary *** analyses were performed using Stata software,and statistical significance was determined at P<*** Thirteen RCTs from Iran and China were *** participant attrition burden in vitamin D recipients was 6%[95%confidence interval(CI):0.03,0.10],and its risk did not vary from *** D and calcium co-supplementation reduced the cesarean section incidence in GDM patients[risk ratio(RR):0.37;95%CI:0.18,0.74].The hyperbilirubinemia or hospitalization risk in their newborns decreased with vitamin D supplementation(RR:0.47;95%CI:0.27,0.83)and co-supplementation with calcium(RR:0.35;95%CI:0.16,0.77)or omega3 fatty acids(RR:0.25;95%CI:0.08,0.77).Vitamin D and probiotics co-supplementation decreased newborn hyperbilirubinemia risk(RR:0.28;95%CI:0.09,0.91).FPG levels and macrosomia risk did not vary across *** In RCTs,vitamin D supplementation or co-supplementation in GDM patients showed a low participant attrition burden and low risk of cesarean section,newborn hyperbilirubinemia,and newborn hospitalization.

关键词： Diabetes Gestational Vitamin D Prenatal care Nutrition therapy