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Rapid adsorption of toxic Pb(Ⅱ) ions from aqueous solution using multiwall carbon nanotubes synthesized by microwave chemical vapor deposition technique

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Journal of Environmental Sciences 2016年第7期28卷 143-155页

作者： Nabisab Mujawar Mubarak jaya narayan sahu Ezzat Chan Abdullah Natesan Subramanian jayakumar Department of Chemical Engineering Faculty of Engineering and Science Curtin University Sarawak Department of Chemical Engineering Faculty of Engineering University of Malaya Petroleum and Chemical Engineering Programme Area Faculty of Engineering Institut Teknologi Brunei Malaysia–Japan International Institute of Technology Universiti Teknologi Malaysia Jalan Semarak

Multiwall carbon nanotubes（MWCNTs） were synthesized using a tubular microwave chemical vapor deposition technique, using acetylene and hydrogen as the precursor gases and ferrocene as catalyst. The novel MWCNT samples were tested for their performance in terms of Pb（Ⅱ）binding. The synthesized MWCNT samples were characterized using Fourier Transform Infrared（FT-IR）, Brunauer, Emmett and Teller（BET）, Field Emission Scanning Electron Microscopy（FESEM） analysis, and the adsorption of Pb（Ⅱ） was studied as a function of p H,initial Pb（Ⅱ） concentration, MWCNT dosage, agitation speed, and adsorption time, and process parameters were optimized. The adsorption data followed both Freundlich and Langmuir isotherms. On the basis of the Langmuir model, Qmaxwas calculated to be 104.2 mg/g for the microwave-synthesized MWCNTs. In order to investigate the dynamic behavior of MWCNTs as an adsorbent, the kinetic data were modeled using pseudo first-order and pseudo second-order equations. Different thermodynamic parameters, viz., ΔH0, ΔS0and ΔG0were evaluated and it was found that the adsorption was feasible, spontaneous and endothermic in nature. The statistical analysis revealed that the optimum conditions for the highest removal（99.9%） of Pb（Ⅱ） are at p H 5, MWCNT dosage 0.1 g, agitation speed 160 r/min and time of 22.5 min with the initial concentration of 10 mg/L. Our results proved that microwave-synthesized MWCNTs can be used as an effective Pb（Ⅱ） adsorbent due to their high adsorption capacity as well as the short adsorption time needed to achieve equilibrium.

关键词： Microwave Heavy metal Wastewater treatment Adsorption MWCNTs Lead

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Comparison of a plant based natural surfactant with SDS for washing of As(V) from Fe rich soil

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Journal of Environmental Sciences 2013年第11期25卷 2247-2256页

作者： Soumyadeep Mukhopadhyay Mohd. Ali Hashim jaya narayan sahu Ismail Yusoff Bhaskar Sen Gupta Department of Chemical Engineering University of Malaya Department of Geology University of Malaya School of Planning Architecture and Civil Engineering Queen's University Belfast

This study explores the possible application of a biodegradable plant based surfactant, obtained from Sapindus mukorossi, for washing low levels of arsenic （As） from an iron （Fe） rich soil. Natural association of As（Ⅴ） with Fe（Ⅲ） makes the process difficult. Soapnut solution was compared to anionic surfactant sodium dodecyl sulfate （SDS） in down-flow and a newly introduced suction mode for soil column washing. It was observed that soapnut attained up to 86% efficiency with respect to SDS in removing As. Full factorial design of experiment revealed a very good fit of data. The suction mode generated up to 83 kPa pressure inside column whilst down-flow mode generated a much higher pressure of 214 kPa, thus making the suction mode more efficient. Micellar solubilisation was found to be responsible for As desorption from the soil and it followed 1st order kinetics. Desorption rate coefficient of suction mode was found to be in the range of 0.005 to 0.01, much higher than down-flow mode values. Analysis of the PT-IR data suggested that the soapnut solution did not interact chemically with As, offering an option for reusing the surfactant. Soapnut can be considered as a soil washing agent for removing As even from soil with high Fe content.

关键词： soil washing soapnut Sapindus mukorossi arsenic plant based surfactant

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A comparative study of biopolymers and alum in the separation and recovery of pulp fibres from paper mill effluent by flocculation

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Journal of Environmental Sciences 2014年第9期26卷 1851-1860页

作者： Sumona Mukherjee Soumyadeep Mukhopadhyay Agamuthu Pariatamby Mohd. Ali Hashim jaya narayan sahu Bhaskar Sen Gupta Institute of Biological Sciences University of Malaya50603 Kuala LumpurMalaysia Department of Chemical Engineering University of Malaya50603 Kuala LumpurMalaysia Department of Petroleum and Chemical Engineering Faculty of EngineeringInstitute Teknologi BruneiTungku GadongBrunei Darussalam School of Planning Architecture and Civil EngineeringQueen's University BelfastDavid Keir BuildingBelfast BT9 5AGUK

Recovery of cellulose fibres from paper mill effluent has been studied using common polysacchatides or biopolymers such as Guar gum, Xanthan gum and Locust bean gum as flocculent. Guar gum is commonly used in sizing paper and routinely used in paper making. The results have been compared with the performance of alum, which is a common coagulant and a key ingredient of the paper industry. Guar gum recovered about 3.86 mg/L of fibre and was most effective among the biopolyrners. Settling velocity distribution curves demonstrated that Guar gum was able to settle the fibres faster than the other biopolymers; however, alum displayed the highest particle removal rate than all the biopolymers at any of the settling velocities. Alum, Guar gum, Xanthan gum and Locust bean gum removed 97.46%, 94.68%, 92.39% and 92.46% turbidity of raw effluent at a settling velocity of 0.5 cm/min, respectively. The conditions for obtaining the lowest sludge volume index such as pH, dose and mixing speed were optimised for guar gum which was the most effective among the biopolymers. Response surface methodology was used to design all experiments, and an optimum operational setting was proposed. The test results indicate similar performance of alum and Guar gum in terms of fioc settling velocities and sludge volume index. Since Guar gum is a plant derived natural substance, it is environmentally benign and offers a green treatment option to the paper mills for pulp recycling.

关键词： BiopolymerRecovery of fibresGuar gumFlocculationPaper industry

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Histological difference in ligament flavum between degenerative lumbar canal stenosis and non-stenotic group:A prospective,comparative study

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World Journal of Orthopedics 2022年第9期13卷 791-801页

作者： Mantu Jain Mukund Sable Amit Purushottam Tirpude Rabi narayan sahu Sudeep Kumar Samanta Gurudip Das Department of Orthopaedics All India Institute of Medical Sciences BhubaneswarBhuabneswar 751019OdishaIndia Department of Pathology All India Institute of Medical Sciences BhubaneswarBhubaneswar 751019OdishaIndia Department of Anatomy All India Institute of Medical Sciences RaipurRaipur 492009ChattisgarhIndia Department of Neurosurgery All India Institute of Medical Sciences BhubaneswarBhubaneswar 751019OdishaIndia

BACKGROUND Ligament flavum(LF)hypertropy is the main etiopathogenesis of lumbar canal stenosis(LCS).The purely elastic LF undergoes a morphological adaptation including a reduction in the elastic fibers and a consequent increase in the collagen content,fibrosis,cicatrization,and ***,the morphometric analysis can delineate the LF in patients with LCS from those without LCS,which would help in better understanding LCS *** To compare the histopathological changes in LF between the degenerative LCS and non-stenotic(non-LCS)*** The present prospective study was conducted in 82 patients who were divided into two groups,namely LCS and *** details of the patients such as duration of symptoms,level of involvement,and number of segments were *** LF obtained from both groups was histopathologically examined for the fibrosis score,elastic fiber degeneration,calcification,and chondroid *** details included a change in elastin and collagen percentages,elastin/collagen ratio,elastic fiber fragmentation,and ligamentocyte *** parameters were compared between the two groups by using the independent t test,Chi-square test,and Pearson’s correlation *** Out of 82 cases,74 were analysed,34 in LCS and 40 in non-LCS *** mean±SD age of presentation in LCS and non-LCS group was 49.2±8.9 and 43.1±14.3 *** LCS group(n=34)exhibited significant differences in fibrosis(P=0.002),elastic fiber degeneration(P=0.01),%elastic fragmentation(66.5±16.3 vs 29.5±16.9),%elastic,content(26.9±6.7 vs 34.7±8.4),%collagen content(63.6±10.4 vs 54.9±6.4),reduction of elastic/collagen(0.4±0.1 vs 0.6±0.1),and ligamentocyte number(39.1±19.1 vs 53.5±26.9)as compared to non-LCS group(n=40).The calcification(P=0.08)and Pearson’s correlation between duration and loss of elastin was not *** difference in LF morphology is consistent in patient’s≥40 years of age among the groups as found in

关键词： Spinal stenosis Lumbar spine Ligamentum flavum histopathology Morphometry

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Effect of Exercise on NAFLD and Its Risk Factors:Comparison of Moderate versus Low Intensity Exercise

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Journal of Clinical and Translational Hepatology 2020年第2期8卷 120-126页

作者： Preetam Nath Manas Kumar Panigrahi Manoj Kumar sahu Jimmy narayan Ranjan Kumar Sahoo Ananya Apurba Patra Satyaswarup Jena Arun Kumar Patnaik Anjan Jena Shivaram Prasad Singh Department of Gastroenterology&Hepatology Kalinga Institute of Medical SciencesBhubaneswarOdishaIndia Department of Gastroenterology All India Institute of Medical SciencesBhubaneswarOdishaIndia Department of Gastroenterology IMS and SUM HospitalBhubaneswarOdishaIndia Department of Radiodiagnosis&Imaging Kalinga Institute of Medical SciencesBhubaneswarOdishaIndia Department of Radiology IMS and SUM HospitalBhubaneswarOdishaIndia Dispensary Biju Patnaik State Police AcademyBhubaneswarOdishaIndia Department of Gastroenterology S.C.B.Medical College753007 CuttackOdishaIndia

Background and Aims: Lifestyle (exercise and dietary) modification is the mainstay of treatment for non-alcoholic fatty liver disease (NAFLD). However, there is paucity of data on effect of intensity of exercise in management of NAFLD, and we aimed to study the effect of variable intensities of exercise on NAFLD. Methods: The study was performed in the Department of Gastroenterology of the SCB Medical Col-lege, Cuttack and the Biju Patnaik State Police Academy, Bhu-baneswar. The subjects were police trainees [18 in a moderate intensity exercise group (MIG) and 19 in a low in-tensity exercise group (LIG)] recruited for a 6-month physical training course (261.8 Kcalorie, 3.6 metabolic equivalent in MIG and 153.6 Kcalorie, 2.1 metabolic equivalent in LIG). NAFLD was diagnosed by ultrasonography, with exclusion of all secondary causes of steatosis. All participants were eval-uated by anthropometry (weight, height, body mass index (BMI), waist circumference), assessed for blood pressure and biochemical parameters (blood glucose, liver function test, lipid profile, serum insulin), and subjected to transabdo-minal ultrasonography before and after 6 months of physical training, and the results were compared. Results: Both the groups had similar BMI, fasting plasma glucose, AST, gamma-glutamyl transpeptidase, insulin, and homeostatic model as-sessment-insulin resistance (known as HOMA-IR) (p>0.05). However, subjects in the LIG were older and had lower alanine transaminase, higher triglycerides and lower high-density lip-oproteins than MIG subjects. There was a significant reduc-tion in BMI (27.0±2.1 to 26.8±2.0;p=0.001), fasting blood glucose (106.7±21.6 to 85.8±19.0;p<0.001), serum trigly-cerides (167.5±56.7 to 124.6±63.5;p=0.017), total choles-terol (216.8±29.2 to 196.7±26.6;p=0.037), low-density lipoprotein cholesterol (134.6±21.4 to 130.5±21.9;p=0.010), serum aspartate transaminase (39.3±32.2 to 30.9±11.4;p<0.001), serum alanine transaminase (56.6 ±28.7 to 33.0±11.3;p<0.

关键词： Exercise NAFLD Intensity Physical activity

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An Assessment of Comprehensive Knowledge of HIV/AIDS among Slum and Non-Slum Populations in Delhi, India

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Open Journal of Preventive Medicine 2015年第6期5卷 259-268页

作者： Pravin K. Jha Padum narayan Saritha Nair Deepika Ganju Damodar sahu Arvind Pandey Centre for Study of Regional Development Jawaharlal Nehru University New Delhi India National Institute of Medical Statistics New Delhi India Population Council Delhi India

In order to design appropriate HIV prevention programs, it is important to examine the perception and knowledge of HIV/AIDS and methods of preventive. This article explores comprehensive knowledge of HIV/AIDS prevention methods among women and men in slum and non-slum areas in the National Capital Territory of Delhi, India. Data were drawn from the National Family Health Survey, 2005-06 (NFHS-3). The sample included 3096 women aged 15 - 49 years and 1321 men aged 15 - 54 years. Pearson Chi-square test and logistic regression analyses were conducted to examine the association between the study variables and the background characteristics of the slum and non-slum populations. Comprehensive knowledge of HIV/AIDS prevention methods was significantly lower among women and men in slum areas as compared with non-slum areas. Compared to men, women had less comprehensive knowledge of HIV/AIDS prevention methods in slum and non-slum areas, even after controlling for various demographic and socio-economic and exposure variables. Findings indicate that comprehensive knowledge of HIV prevention methods is low among women in slum areas. Interventions are needed to build knowledge of HIV transmission and prevention methods in this vulnerable group. Strategies to build awareness of HIV/AIDS could include mass media campaigns HIV/AIDS, and information, education and communication programs (IEC) on HIV/AIDS in slum areas.

关键词： Slum Knowledge HIV/AIDS

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Multiple Sexual Partners and Vulnerability to HIV: A Study of Patterns of Sexual Behaviour in the Slum Population of India

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World Journal of AIDS 2014年第4期4卷 373-381页

作者： Pravin K. Jha Damodar sahu K. Srikanth Reddy Padum narayan Arvind Pandey Centre for Study of Regional Development Jawaharlal Nehru University New Delhi India National Institute of Medical Statistics New Delhi India

Globally, research indicates that monogamous married women living in slums are at heightened risk of HIV men’s risky sexual behaviour. Hence, to reduce the risk of HIV transmission, there is need to understand the number, nature and variation in transition of sexual partners of men in living in slums. This paper uses India’s National Family Health Survey-3 data to estimate the variation in the type of sexual partners among sexually active men age 15 - 54 with more than one sexual partner in last 12 months prior to the survey in eight slums?of India. Among sexually active men, 1.3 percent reported having more than one sexual partner in the last 12 months prior to the survey. Men who are more likely to have two or more partners are those who are young, especially below age 25 years, never married, educated up to 5 years, and from middle class. There is a higher increase in the probability of sex with spouse from second last to the last sexual partner in non-slum areas than slum areas. However, in case of transition from other friends/relatives and female sex workers to spousal partners, there is a major decline in probability among non-slum men than slum men. These transitions are extremely important from the perspective of curbing the spread of HIV epidemic, especially in situations where women lack control over their own sexuality and seldom use condom in marital sex. Therefore, strategies focused in slums should either consider reducing men’s risky sexual behaviour or build capacities of women to negotiate safe sex in marital relationships or consider a combination of both.

关键词： Slum Sexual Partners Transition Probability

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浇注铝镇静钢用防堵塞水口的设计与开发

浇注铝镇静钢用防堵塞水口的设计与开发

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2008年耐火材料学术交流会

作者：尤士伟孙荣海贺中央 Birendra Prasad Dr.jayant Kumar sahu Jai narayan Tiwari OCL 濮阳濮耐高温材料股份有限公司

当今,每个钢厂都更加重视质量和竞争性的花费。由于连铸炼钢增加了流程长度,降低了成本,因此,连铸替代了原来的铸锭法炼钢。中间包耐火材料的任何过早损毁,都会终止浇注而且降低钢质量。据观察,钢厂面临着铝堵塞潜入式水口内孔壁问题的... 详细信息

当今,每个钢厂都更加重视质量和竞争性的花费。由于连铸炼钢增加了流程长度,降低了成本,因此,连铸替代了原来的铸锭法炼钢。中间包耐火材料的任何过早损毁,都会终止浇注而且降低钢质量。据观察,钢厂面临着铝堵塞潜入式水口内孔壁问题的困惑。为了能延长流程长度,SEN/SES对中间包寿命起着重要作用。铝沉积导致的水口阻塞给连铸带来严重问题,特别是在低碳铝镇静钢中,经常观察到铝沉积现象。堵塞是因为未完全清除悬浮在钢水中的固体杂质造成的。最初,氧化铝颗粒以及其他非金属杂质开始缓慢连续的堵塞内壁。一旦这些物质形成一薄层黏附在水口内表面,就会加快堵塞,甚至阻碍钢的静态力。结果,内孔的有效直径从进口端到出口端不均匀地减小。具有两个或四个端口的水口更是如此,这就导致了钢流混乱以及不稳定操作。只有几微米的氧化铝颗粒对钢水质量影响很小,这些氧化铝颗粒未曾被钢包/中间包结晶器内的保护渣所吸收,但是较大颗粒会黏附在水口上,并从水口内孔中脱落,最终给连铸产品带来了不少缺陷。本文,利用氧化铝沉积在下水口内壁问题来研究观察到的连铸产品的缺陷。基于对堵塞材料的研究,引用了堵塞发生的可能性机理。开发了一种特殊类型的无碳防堵塞合成混合物,并展示了该混合物作用于水口内壁的应用方法。这种材料的特性是它在还原条件下,接受热处理时,会形成一个具有精细气孔尺寸分布的致密结构。精细致密结构有利于阻止氧化铝沉积并保持连铸过程中水口内孔清洁。除了开发新材料,还提出了设计水口内孔及端口的新方法。改进的应用于水口的防堵塞材料以及新型内孔、端口设计最初在实验室的试验窑炉中进行了试验,并最终在整体钢部件中成功地进行了试验。实验中,推荐使用了一个预热操作程序,以阻止由于金属冷却带来的水口堵塞。具体试验得到了决定性结论,这些结论对钢厂十分有益。

关键词：堵塞连铸潜入式水口流程长度过早损坏

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