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Study on Adsorption of Cu2+,Pb2+and Zn2+by Natural Bentonite

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Study on Adsorption of Cu2+,Pb2+and Zn2+by Natural Bentonite

作者： olivia Addo-Bankas 西南科技大学

学位级别：硕士

The adsorption properties of clay minerals have been studied extensively in recent years,from the studies,montmorillonites have been considered as effective in the removal of metal ions from aqueous *** this thesis,the use of natural bentonite for the adsorption of copper（Cu2+）,lead（Pb2+）and zinc（Zn2+）ions from aqueous solution was *** of the bentonite clay interactions responsible for adsorption was studied using x-ray diffraction（XRD）,surface area and pore size（BET）,infrared spectroscopy（FT-IR）,SEM（Scanning electron microscope）,and x-ray fluorescence（XRF）.In this study,nitrate salts of copper,lead and zinc were used to prepare adsorbate solutions of Cu2+,Pb2+ and Zn2+.Batch adsorption experiment was used to determine the removal efficiencies of mixture of the target metals by bentonite clay with respect to operating conditions such as pH,metal concentration,and contact *** studies was conducted at different metal concentrations,with pH,contact time,rotary speed and temperature constant at 4,60 min,150 RMP and 25 □.The results of the equilibrium studies indicated a high efficiency of bentonite in the removal of Pb2+,Cu2+and Zn2+ions,with the highest removal for Cu2+ Pb2+and Zn2+being 98.59%,97.76%and 96.15%at optimum initial concentrations of 10 mg/L,15 mg/L and 10 mg/L *** to correlation coefficient,the obtained adsorption process could be better described with Langmuir isotherm *** maximum adsorption capacity of clay for Cu2+,Zn2+and Pb2+ions fitted with Langmuir isotherm was found to be 2.4,2.9 and 2.8 mg/g *** time studies were conducted using 60 mins to 300 *** results for 60 mins showed the highest%removal for all three metals with Cu2+recording 98.59%adsorption removal efficiency,Pb2+having 96.81%and Zn2+with 96.15%.The results in the paper proposed the potential role of natural bentonite clay obtained from Santai,China in wastewater treatment processes as an affordable,

关键词： Waste Water Treatment Bentonite Heavy Hetals Adsorption

Data and subject heterogeneity and data sharing:keys to translational success in spinal cord injury research?

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Neural Regeneration Research 2023年第8期18卷 1730-1731页

作者： karim Fouad olivia H.Wireman John C.Gensel Faculty of Rehabilitation Medicine Department of Physical TherapyNeuroscience and Mental Health InstituteUniversity of AlbertaAlbertaCanada Spinal Cord and Brain Injury Research Center(SCoBIRC) Department of PhysiologyUniversity of Kentucky College of MedicineLexingtonKYUSA

Spinal cord injury(SCI)is a highly devastating and com plex inj u ry with many seconda ry *** a treatment for SCI has been a rollercoaster ride through exciting peaks and sobering *** a matter of fact,there are still ... 详细信息

关键词： damage treatment SCI

Oxidative Degradation of Thermoplastic Starch Induced by UV Radiation

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Journal of Renewable Materials 2019年第4期7卷 383-391页

作者： Mayte M.Quispe olivia V.López Marcelo A.Villar Planta Piloto de Ingeniería Química PLAPIQUI(UNS CONICET)Bahía Blanca(8000)Argentina Departamento de Ingeniería Química Universidad Nacional del Sur(UNS)Bahía Blanca(8000)Argentina

Among biopolymers,thermoplastic starch(TPS)is a good candidate to obtain biomaterials because of its natural origin,biodegradable character,and *** to ultraviolet(UV)radiation causes significant degradation of starch-based materials,inducing photooxidative reactions which result in breaking of polymer chains,production of free radical,and reduction of molar *** changes produce a deterioration of TPS mechanical properties,leading to useless materials after an unpredictable *** this work,changes induced on TPS by UV radiation,analyzing structural properties and mechanical behavior,are *** was obtained through thermo-mechanical processing of native corn starch in the presence of water(45%w/w)and glycerol(30%w/w)as *** were obtained by thermocompression and,before testing,specimens were conditioned to reduce material *** process was performed by exposing TPS to 264 h UV radiation in a weathering test ***’s weight loss was determined *** changes were studied by Fourier Transform Infrared Spectroscopy(FTIR)and morphological modifications were analyzed by Scanning Electron Microscopy(SEM).Reduction of weight average molar mass was measured by Static Light Scattering(SLS).Changes in mechanical properties were studied from tensile *** 96 h exposure,TPS specimens presented a weight reduction of 4-6%,mainly attributed to plasticizers lost by *** observations showed that UV radiation induced morphological changes on TPS,evidenced by an increment of specimens *** FTIR,it was detected the presence of an additional band located at 1726 cm-1 in samples submitted to UV radiation,attributed to the formation of-C=O *** average molar mass of native starch was in the order of 107 g *** exposure to UV radiation decreased significantly its molar mass,confirming molecular degradation of the *** TPS was exposed during 48 h,it

关键词： Thermoplastic starch UV radiation structural properties mechanical behavior

How Bonapp Drives Future Development in Shanghai through Bilingual Mobile Platforms

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How Bonapp Drives Future Development in Shanghai through Bil...

作者： olivia Astrid Margareta Henriksson 上海交通大学

学位级别：硕士

Background and Problem: Rapid technological developments are challenging organisations to compete in an entirely new *** platforms are matchmaking its way to building strong competitive advantages through network *** has empowered entrepreneurs which spurred an era where mobile applications can remote control everyday *** of vast advancement in technological intelligence,the cultural gorge between the Chinese and foreign community still exists and up until three years ago,when Bonapp entered the market,firms had rather chosen which side to attract than to confront the issue of starting to build a cross-cultural ***: The objective of this dissertation is to enlarge the understanding of the interrelation between bilingualism and merger of the Chinese native and Expatriate communities in a long-term *** fulfil this purpose,the research question aims towards exploring above mentioned objective through the case of Bonapp,Shanghai’s first bilingual mobile restaurant review ***: The empirical findings were collected through a quantitative survey,and the result was based on the answers of the 305 *** order to draw inferences and create generalisations,the collected data was analysed and compared to the theoretical *** and Conclusion: This research found that bilingualism can ease conflicts evoked by cultural differences and solidly encourage ***,Bonapp was recognised as a first introducer of bilingualism into the mobile restaurant review applications market in *** research further suggests a correlation between increased cultural acceptance through greater exposure to *** last,the importance of trust was also explored in this dissertation,suggesting it as fuel the publics’ perception of organisations reliability.

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Nest composition and worker relatedness in three slave-making ants of the genus Rossomyrmex Arnoldi and their Proformica Ruzsky hosts （Hymenoptera, Formicidae）

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Insect Science 2010年第4期17卷 361-368页

作者： Alberto Tinaut Francisca Ruano olivia Sanllorente Alejandra Fernandez-Zambrano Celal karaman Yelimbek kaz Department of Animal Biology Faculty of Sciences University of Granada Granada Spain Department of Biology Faculty of Arts and Sciences Trakya University Edirne Turkey Department of Biology Faculty of Sciences L.N. Gumilev Eurasian National University Astana Kazakhstan

In this paper, we analyze and compare nest composition and architecture as well as worker relatedness in three related species of slave-making ants： Rossomyrmex anatolicus, R. minuchae, and R. quandratinodum. Colony structure within nests is an important trait in ants, especially in the case of mixed societies, when host and parasite coexist in the same nest. Data for their respective free-living hosts, Proformica korbi, P.. longiseta and P. sp., are also provided. For our study, we integrated a meticulous excava- tion procedure with a genetic method. We conclude that the average number of parasites, as well as of slaves, is species-specific, whereas nest depth depends on the nest archi- tecture of the host. The genus Rossomyrmex seems to be monogynous and monandrous, whereas Proformica shows differences in the number of queens and mating frequency. R. quandratinodum shows different traits in nest composition （host/parasite ratio： P/R） and architecture. The difference in traits may account for some differences in parasitism： raid process or avoidance of parasitism.

关键词： nest architecture nest composition Proformica relatedness Rossomyrmex,slave-making ants

Long-term physical,mental and social health effects of COVID-19 in the pediatric population:a scoping review

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World Journal of Pediatrics 2022年第3期18卷 149-159页

作者： Madeline Borel Luyu Xie olivia kapera Adrian Mihalcea Jeffrey kahn Sarah E.Messiah School of Public Health University of Texas Health Science CenterDallas Campus2777 N Stemmons FwyDallasTX 75207USA Center for Pediatric Population Health University of Texas Health School of Public Health and Children’s Health System of TexasDallasTXUSA School of Public Health University of Texas Health Science CenterAustin CampusAustinTXUSA School of Public Health University of Texas Health Science CenterHouston CampusHoustonTXUSA Department of Pediatrics University of Texas Southwestern Medical CenterDallasTXUSA Children’s Health System of Texas DallasTXUSA

Background The majority of coronavirus disease 2019(COVID-19)symptom presentations in adults and children appear to run their course within a couple of ***,a subgroup of adults has started to emerge with effects lasting several months or more after initial infection,which raises questions about the long-term physical,mental and social health effects of COVID-19 in the pediatric *** purpose of this review was to determine these impacts well into the second year of the *** A search was conducted using PubMed,Web of Science,Science Direct,and Cochrane between 11/1/2019 and 9/1/*** inclusion criteria were as follows:(1)COVID-19 illness and symptoms in children;(2)severe acute respiratory syndrome coronavirus 2 in children;(3)English language;and(4)human studies *** The few studies that have documented long-term physical symptoms in children show that fatigue,difficulty in concentrating(brain fog),sleep disturbances,and sensory problems are the most reported *** studies examining the impact of COVID-19 in pediatric populations have focused on initial clinical presentation,and symptoms,which are similar to those in adult *** addition,COVID-19 has had a moderate impact on children and adolescents’social environment,which may exacerbate current and future physiological,psychological,behavioral,and academic *** There are limited studies reporting long physical symptoms of COVID-19 in the pediatric ***,pediatric COVID-19 cases are underreported due to low rates of testing and symptomatic infection,which calls for more longitudinal *** who have experienced COVID-19 illness should be monitored for long physiological,psychological,behavioral,and academic outcomes.

关键词： Adolescents Children Coronavirus disease 2019(COVID-19) Long-COVID symptoms

Direct evidence of traps controlling the carriers transport in SnO_(2) nanobelts

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Journal of Semiconductors 2017年第12期38卷 8-12页

作者： olivia M.Berengue Adenilson J.Chiquito LCCTnano Departamento de Fisica e Quimica-Universidade Estadual Paulista(Unesp)Faculdade de Engenharia de GuaratinguetfiCampus GuaratinguetfiSgo PauloBrasil NanO LaB-Departamento de Fisica Universidade Federal de Sao CarlosCEP 13565-905CP 676Sgo CarlosSgo PauloBrasil

This work reports on direct evidence of localized states in undoped Sn02 nanobelts. Effects of disorder and electron localization were observed in Schottky barrier dependence on the temperature and in thermally stimulated currents. A transition from thermal activation to hopping transport mechanisms was also observed. The energy levels found by thermally stimulated current experiments were in close agreement with transport data confirming the role of localization in determining the properties of devices.

关键词： trap transport SnO2

Wild bacterial probiotics fed to larvae of mass-reared Queensland fruit fly[Bactrocera tryoni(Froggatt)]do not impact long-term survival,mate selection,or locomotor activity

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Insect Science 2020年第4期27卷 745-755页

作者： Lucas A.Shuttleworth Mohammed Abul Monjur khan Damian Collins Terry Osborne olivia L.Reynolds New South Wales Department of Primary Industries Elizabeth Macarthur Agricultural InstituteMenangleAustralia Faculty of Agriculture DefDartment of EntomologyBangladesh Agricultural UniversityMymensinghBangladesh Graham Centre(an alliance between NSW Department of Primary Industries and Charles Sturt University) Wagga WaggaNew South WalesAustralia State key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops Institute of Applied EcologyFujian Agriculture and Forestry UniversityFuzhouChina

Queensland fruit fly[Bactrocera Uyoni(Froggatt),Diptera,Tephritidae]is the most devastating insect pest impacting Australian *** Sterile Insect Technique(SIT)is an important component of tephritid pest management ***,mass-rearing and irradiation(to render insects sterile)may reduce the fitness and performance of the insect,including the ability of sterile males to successfully compete for wild *** of the gut microbiome,including the supplementation with bacterial probiotics shows promise for enhancing the quality of mass-reared sterile flies,however there are fewer published studies targeting the larval *** this study,we supplemented the larval stage of mass-reared *** with bacterial *** tested several individual bacteria that had been previously isolated and characterized from the gut of wild *** larvae including Asaia sp.,Enterobacter sp.,Lactobacillus sp.,Leuconostoc *** also tested a consortium of all four of these bacterial *** fitness parameters tested included adult survival in field cages,laboratory mate selection of bacteria supplemented males by bacteria nonsupplemented females,and laboratory locomotor activity of adult *** of the bacterial probiotic treatments in the current study was significantly different to the control for field survival,mate selection or locomotor activity of adult ***,which agree with some of the other studies regarding bacterial probiotics fed to the larval stage of *** work is needed to determine if feeding the same,and/or other probiotics to adults,as opposed to larvae can positively impact survival,mating performance,mating competitiveness and locomotor activity of *** bacterial group(s)and function of bacterial species that increase fitness and competitiveness is also of interest to tephritid mass-rearing programs.

关键词： area wide integrated pest management mass-rearing mate choice Sterile Insect Technique Tephritidae

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