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Extraction and Enrichment of Copper by Liquid Emulsion Membrane Using LIX 664N

Journal of Environmental Protection 2014年第17期5卷 1611-1617页

作者： Rashmi Kumar Dahyalal J. Shah krishna kant tiwari D. J. Sanghvi College of Engineering Mumbai India Mukesh Patel School of Technology Management & Engineering (NMIMS) Mumbai India Jaypee University of Engineering and Technology (Guna) Madhya Pradesh India

Process intensification using liquid emulsion membranes (LEMs) for extraction of copper has been studied in this work. In LEM process the extraction and stripping processes are combined in one stage. The solubility of the solute or the chemical affinity between the solute and carrier reagent in the membrane results in the separation of the solute from the feed mixture. In this work the membrane phase comprised of LIX 664N as the extractant dissolved in kerosene and Span 80 as surfactant. The stripping phase was sulfuric acid with 180 g/l concentration and feed phase had copper concentration of 3.5 g/l. Effect of various process parameters such as batch contact time, speed of agitation, W:O ratio and treat ratio has been experimentally investigated to get better insight of the process. The maximum enrichment of copper in the internal phase obtained was 11.6 times with batch contact time of 10 minutes, agitation speed of 300 rpm and treat ratio of 6:1.

关键词： Extraction Enrichment Liquid Emulsion Membranes LIX 664N Copper

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Separation of Copper and Nickel by Solvent Extraction Using LIX 664N

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Journal of Environmental Protection 2013年第4期4卷 315-318页

作者： Rashmi Kumar Dahyalal J. Shah krishna kant tiwari D. J. Sanghvi College of Engineering Mumbai India Jaypee University of Engineering and Technology (JUET) Madhya Pradesh India Mukesh Patel School of Technology Management & Engineering (NMIMS) Mumbai India

Separation of copper and nickel by liquid-liquid extraction from aqueous solutions was studied using LIX 664N in kerosene as solvent. Both metals were taken in their sulfate form and ratio of copper to nickel in feed solutions was maintained as 10:1. LIX 664N concentration in kerosene was varied from 10% to 40% (v/v) and its effect was studied on percent extraction of copper and nickel for organic to aqueous (O:A) phase ratio of 2:1 at pH 2. Experimental results showed that at pH 2, copper was selectively extracted from its mixture with nickel. Selectivity for copper extraction was as high as 6000 with 40% LIX 664N. Calculations using extraction isotherm indicate almost complete recovery of copper in two stages with O:A ratio of 1:1 and in one stage with O:A ratio of 2:1. After extraction of copper, the pH of raffinate containing nickel was adjusted to a value of 9 by addition of ammonia solution. The effect of LIX 664N concentration on extraction of nickel was studied. Up to 80% nickel could be extracted with 30% LIX 664N at O:A phase ratio of 2:1. Stripping of copper from the organic phase with 180 g/l sulfuric acid at O:A phase ratio of 1:1 gave 98.5% copper recovery in a two-stage operation.

关键词： Copper Nickel LIX 664N Solvent Extraction Distribution Coefficient Selectivity

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Effectiveness of lukewarm water compress on reduction of breast pain and breast engorgement among post-cesarean section mothers

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中西医结合护理杂志(英文) 2023年第3期5卷 167-172页

作者： Soni CHAUHAN Kumari NUTAN Monica AGRAWAL Surya kant tiwari Nursing Tutor Yatharth Nursing College and Paramedical InstituteChandauliUttar PradeshIndia Institute of Nursing King George’s Medical UniversityLucknowUttar PradeshIndia Professor Cum Vice-Principal M.V.P.Samaj’s Institute of Nursing EducationNashikMaharashtraIndia Department of Obstetrics and Gynecology King George’s Medical UniversityLucknowUttar PradeshIndia

Objective:The study aimed to assess the effectiveness of lukewarm water compress on breast pain and breast engorgement among post-cesarean primiparous *** and Methods:This quasi-experimental posttest-only design was conducted with 60 post-cesarean section primiparous mothers between October 2018 and January 2019.A simple random sampling technique was used to allocate 30 participants to both experimental and control *** experimental group received lukewarm water compress using a sponge cloth for 20 min twice a day on the second,third,and fourth postnatal *** control group received routine hospital *** pain and engorgement were assessed using the Visual Analog Pain Scale and Breast Engorgement Assessment Scale on the third,fourth,and fifth postnatal ***:Significant differences were observed between the experimental and control groups on day 1 and day 3 in terms of breast pain and engorgement scores among post-cesarean section mothers(P0.05).Conclusion:Lukewarm water compress is effective in reducing breast pain and engorgement in post-cesarean primiparous *** research can include randomized controlled trials to evaluate the effectiveness of different therapies in treating breast pain and engorgement.

关键词： Effectiveness lukewarm water compress post-cesarean section postnatal posttest only primiparous

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Prevalence and predictors of smartphone addiction and insomnia among nurses working in the outpatient department after the second wave of the coronavirus disease 2019 pandemic

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Journal of Integrative Nursing 2023年第4期5卷 273-279页

作者： Manisha MEHRA Poonam JOSHI Surya kant tiwari Praveen AGGRAWAL Kamlesh CHANDELIA Srinithya RAGHAVAN Department of Nursing Services All India Institute of Medical SciencesNew DelhiIndia College of Nursing All India Institute of Medical SciencesKalyaniWest BengalIndia College of Nursing All India Institute of Medical SciencesRaebareliUttar PradeshIndia Department of Emergency Medicine All India Institute of Medical SciencesNew DelhiIndia Department of In-Service Education All India Institute of Medical SciencesNew DelhiIndia

Objectives:The present study aims to assess the prevalence and predictors of smartphone addiction and insomnia among nurses working in the outpatient department(OPD)after the second wave of the coronavirus disease 2019(COVID-19)*** and Methods:A descriptive,cross-sectional study was carried out among 117 OPD nurses between October and December 2021 using a purposive sampling *** self-reported standardized scales,the Smartphone Addiction Scale-ShortVersion and Insomnia Severity Index were ***–Smirnov test,Mann–Whitney U,and Kruskal–Wallis Htest were ***’s correlation and Scatter plot were used to determine the relationship between the study variables.A stepwise multiple linear regression analysis was also ***:The majority of participants had slight smartphone addiction(78.6%)and suffered from sub-threshold to severe forms of insomnia(73.5%).A significant mild positive correlation was found between smartphone addiction and insomnia(r=0.195,P<0.05).Stepwise multivariate logistic regression analysis predicted factors such as female gender and exposure to smartphones for more than 5 years influencing smartphone addiction.A strong influence of exposure to the smartphone for more than 5 years was found on insomnia ***:Smartphone addiction and insomnia were identified problems among nurses working in the OPD after the second wave of the COVID-19 pandemic,requiring an urgent need to identify and manage various factors responsible for smartphone addiction and insomnia such as female gender and years of exposure to smartphones.

关键词： Coronavirus disease 2019 insomnia nurses sleeping disturbances smartphone addiction

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