简介:提出一种从黑泥中回收利用钛的新工艺,该工艺包括NaOH水热转化、水洗和H2SO4浸出制备TiO2。在优化的反应条件下,即NaOH溶液浓度为50%(质量分数)、NaOH/黑泥质量比为4:1、反应温度为240°C、反应时间为1h和氧气分压为0.25MPa,钛转化率可达97.2%,主要含钛产物是Na2TiO3。非目标产物Na2TiSiO5在水洗中保持稳定,在水热反应中提高NaOH浓度可以抑制Na2TiSiO5的生成。水热产物经过水洗后,97.6%的Na^+可以回收。含有NaOH的溶液经过浓缩之后可以回用。在较低温度下,水洗物料中96.7%的钛能被较低浓度的硫酸浸出得到钛液。利用所得钛液进一步制备合格TiO2产品。
简介:对化合物[Na_2(H_2O)_(10)][Cu_4(H_2O)_(12)(H_2W_(12)O_(42))]·15H_2O(简称Na_2Cu_4W_(12))进行了体外抗肿瘤活性研究.应用四甲基偶氮唑盐(3-[4,5-dimethylthiazo-2-y]-2,5-diphenyltetrazoliumbromide,MTT)比色法分析Na_2Cu_4W_(12)对人肝癌细胞(HepG2)、人神经母细胞瘤细胞(SHY5Y)增殖抑制活性.采用光学显微镜观察肿瘤细胞的凋亡形态变化,用流式细胞术分析细胞周期和细胞凋亡,计算各期细胞比例及细胞凋亡率.结果表明,Na_2Cu_4W_(12)对HepG2和SHY5Y2种肿瘤细胞增殖半数抑制浓度IC_(50)值分别为5.3和10.2μmol·L~(-1),且呈剂量依赖性.光学显微镜下处理组细胞出现皱缩、变圆、缩小等形态变化,不同浓度Na_2Cu_4W_(12)处理12h早期凋亡细胞所占的百分比显著增加且呈剂量依赖性.综上所述,Na_2Cu_4W_(12)能够抑制胞瘤细胞增殖,诱导细胞凋亡.
简介:一篇小说荧光灯为H2PO4-基于碳dots/Fe3+被设计并且制作合成。碳点被一个确定的一个壶综合热水的方法并且由传播电子显微镜,X光检查衍射计,紫外力的吸收分光计和荧光分光光度计描绘了。碳dots/Fe3+合成被碳点和FeCl3,的水的混合获得,它的荧光性质被荧光分光光度计描绘。碳点的荧光被水的Fe3+阳离子熄灭,导致碳dots/Fe3+的低荧光紧张合成。在另一方面,H2PO4-由化学反应减少了Fe3+的集中并且提高了碳dots/Fe3+的荧光合成。Stern-Volmer方程被介绍描述在合成的碳dots/Fe3+和H2PO4-,和好线性(R2=0.997)在H20.4-12公里的PO4-集中。
简介:Takingadvantageofthelargeγ-detectorarrayGammasphereandtherecoilmassseparatorFMA,highspinstatesin117Bawereinvestigatedthroughtherecoil-β-delayedprotondecaytaggingtechniqueviatheheavy-ioninducedfusion-evaporationreaction64Zn(58Ni,2p3n)117Ba,atabeamenergyof305MeV.Promptγraysbelongingto117Bahavebeenidentifiedfurthermore,arotationalbandhasbeenidentifiedforthefirsttimeandpresentedasbandAinFig.1.
简介:Twofamiliesofcatalysts,basedonPdnanoparticlessupportedonceramicasymmetrictubularaluminamembranes,arestudiesinthedirectsynthesisofH_2O_2.TheyarepreparedbydepositingPdintwoways:(i)reductionwithN_2H_4inanultrasonicbathand(ii)byimpregnation-deposition.Thefirstpreparationleadstolargerparticles,withaveragesizeofaround11nm,whilethesecondpreparationleadstosmallerparticles,withaveragesizearound4nm.Thecatalyticmembranesweretestedasprepared,afterthermaltreatmentinairandafterfurtherpre-reductionwithH_2inmild(100℃)conditions.SampleswerecharacterizedbyTEM,CO-chemisorptionmonitoredbyDRIFTSmethodandTPR,whilecatalytictestshavebeenperformedinasemi-batchrecirculationmembranereactor.Experimentalcatalyticresultswereanalysedusingtwokineticsmodelstoderivethereactionconstantsfortheparallelandconsecutivereactionsofthekineticnetwork.SmallerparticlesofPdshowlowerselectivityduetothehigherrateofparallelcombustion,evenifthebetterdispersionofPdandthushighermetalsurfaceareainthesampleleadtoaproductivityinH_2O_2similarorevenhigherthanthesamplewiththelargerPdparticles.IndependentlyonthepresenceofsmallerorlargerPdnanoparticles,anoxidationtreatmentleadstoasignificantenhancementintheproductivity,althoughthecatalystprogressivelyreducesduringthecatalyticprocess.Theinhibitionoftheparallelcombustionreaction(towater)inducedfromthecalcinationtreatmentremainsafterthein-situreductionoftheoxidizedPdspeciesformedduringthepre-treatment.Thisislikelyduetotheeliminationofdefectsiteswhichdissociativelyactivateoxygen,andtentativelyattributedtoPdsitesabletogivethree-andfour-foldcoordinationofCO.
简介:Inthiswork,asimpleandfacileone-potoleylaminesolvothermalsyntheticmethodwasdevelopedtosynthesizeCu_2ZnSnS_4(CZTS)nanocrystals.AndtheCu_2ZnSn(S,Se)_4(CZTSSe)thinfilmswerepreparedbyselenizingCZTSnanocrystals.TheobtainedCZTSnanocrystalsandCZTSSefilmswerestudiedusingX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM),scanningelectronmicroscopy(SEM),energy-dispersiveX-rayspectroscopy(EDX),andultraviolet–visiblespectrophotometer(UV–Vis).TEMresultsshowthatthesphere–likeCZTSnanoparticleswithdiameterbetween12and35nmarepolydispersed.XRDstudiesindicatethatthepreparedCZTSnanocrystalsformkesteritecrystalstructure,andtheCZTSSefilmswithkesteritecrystalstructurearealsoobtainedattheannealingtemperaturesof500and550°C.Inparticularafterannealingat500°Cfor20min,theCZTSSefilmexhibitsasmooth,uniform,crack-free,andlarge-grainedtopographyandpossessesCu-poorandSn-richcomposition.Moreover,itshowsstrongopticalabsorptionfromvisibletonear-infrared(IR)region,anditsopticalbandgap(Eg)isfoundtobeabout1.44eV.
简介:随着污染物排放标准的日益提高,为降低硫磺回收装置排放尾气中的SO2浓度,从实际出发,分析和探讨了相应的减排措施:升高反应炉炉膛温度、控制好CLAUSE反应炉配风比例和降低硫冷凝器出口温度等,提高硫磺装置系统的硫收率;将部分自产净化尾气作为液硫鼓泡脱气的汽提气,并把含硫废气进行加氢处理,高效净化硫磺尾气;硫池气和脱硫醇氧化尾气改送至CLAUSE反应炉进行制硫;在硫磺回收装置废热锅炉至尾气焚烧炉间的跨线上增加蝶阀,设置氮封,降低或避免高浓度气体泄漏;提高贫胺液品质,降低吸收塔顶温度,提高吸收塔脱硫效果;碱洗处理吸收塔后尾气或将吸收塔后尾气送至脱硫脱硝系统处理。
简介:Asafundamentalpropertyofnuclei,atomicmassesarewidelyusedinmanydomainsofscienceandengineering.Areliableatomicmasstablederivedfromtheexperimentaldata,wheretheatomicmassesandtherelevantexperi-mentalinformationcanbefoundconveniently,isinhighdemandbytheresearchcommunity.Tomeetthedemands,theAtomicMassEvaluation(AME)wasinitiatedin1950'sandaseriesofAMEmasstableshavebeenpublishedeversince.CurrentlytheAMEservestheresearchcommunitybyprovidingthemostreliableandcomprehensiveinformationrelatedtotheatomicmasses.ThenewatomicmassevaluationAME2016waspublishedintheMarchissueofChinesePhysicsCastwocom-plementarypapers[1;2].