Facile hydrothermal synthesis of Ag@AgCl@AlOOH hollow microspheres and their characterizations

Facile hydrothermal synthesis of Ag@AgCl@AlOOH hollow microspheres and their characterizations
Facile hydrothermal synthesis of Ag@AgCl@AlOOH hollow microspheres and their characterizations

Facile hydrothermal synthesis of Ag@AgCl@AlOOH hollow

microspheres and their characterizations

Yan-Yan Dong,Yan-Jun Liu,Ling-Yan Meng,Bo Wang,Ming-Guo Ma n,Ya-Yu Li

College of Materials Science and Technology,Beijing Forestry University,Beijing100083,PR China

a r t i c l e i n f o

Article history:

Received9May2016

Received in revised form

4June2016

Accepted7June2016

Available online8June2016

Keywords:

Microstructure

Nanocomposites

Hydrothermal

Ag

AgCl

Hollow microsphere

a b s t r a c t

In this paper,Ag@AgCl@AlOOH hollow microspheres were successfully synthesized with AgNO3and

AlCl3á6H2O in NaOH/urea solution by a facile hydrothermal method.NaOH/urea solution acted as

structure-directing agent here.Scanning electron microscopy(SEM)and X-ray powder diffraction(XRD)

were used to characterize the as-prepared samples.The effects of hydrothermal heating temperatures on

the phases and morphologies of samples were investigated.The size distributions analysis showed that

the samples were Ag@AgCl@AlOOH microspheres with a diameter of5.48$6.77m m.With higher reac-

tion temperatures,more Ag@AgCl@AlOOH microspheres with hollow structures appeared,and the size

of Ag@AgCl@AlOOH microspheres decreased.The formation process of Ag@AgCl@AlOOH hollow mi-

crospheres was explored and discussed in detail.

&2016Elsevier B.V.All rights reserved.

1.Introduction

Recently,the visible-light-driven photocatalysis are attractive,

due to their excellent properties and widely applications[1–3].

Wen et al.reported the synthesis of MoS2/g-C3N4nanocomposites

with enhanced visible-light photocatalytic activity for the removal

of nitric oxide[4].Ag@AgX(X?Cl,Br,I)particles have also at-

tracted much attention due to the high photocatalytic activities[5–

10].Hollow Ag@AgCl micro/nanostructures have been the most

popular because of their excellent photocatalytic activities[11–14].

In order to improve their photocatalytic ef?ciency and stability,

many ternary composite photocatalysts have also been developed,

such as Ag@AgCl@TiO2[15],Ag@AgCl@ZnO[16],and

Ag@AgCl@C3N4[17].However,as far as we know,the synthesis of

Ag@AgCl@AlOOH hollow microspheres has not been reported yet.

In many cases,hollow microspheres structure could effectively

improve the catalytic ef?ciency due to their big speci?c surface

area,lower density,and low combination rate of photo-generated

electron-hole pairs.

Herein,we reported a facile hydrothermal method for synthe-

sizing Ag@AgCl@AlOOH hollow microspheres.The formation

process of Ag@AgCl@AlOOH hollow microspheres was discussed in

detail.

2.Experimental

All chemicals were of analytical grade and used as received

without further puri?cation.All experiments were conducted

under air atmosphere.A typical synthesis experiment occurred as

follows:0.236g AgNO3and0.337g AlCl3á6H2O were added into

the deionized water(20mL)under vigorous stirring for10min.7g

NaOH and12g urea were added into the deionized water(100mL)

under vigorous stirring to form NaOH/urea solution.Then,the

above two solution were mixed together and were transformed

into a50-mL Te?on-lined stainless steel autoclave.The autoclave

was maintained at140,160,and180°C for12h.The product was

separated from the solution by centrifugation,washed with water

and ethanol three times and dried at60°C for further

characterization.

3.Results and discussion

The phase and crystal structure of the synthesized samples

were characterized by XRD(Rigaku D/max2550,Cu Kαradiation).

Fig.1a-c showed XRD pattern of samples synthesized at140,160,

and180°C,respectively.All samples exhibited similar diffraction

peaks with mixed phases of crystallized Ag with a cubic structure

(marked with*,JCPDS No.04-783)and well-crystallized AgCl with

a cubic structure(JCPDS No.31-1238).The other diffraction peaks

marked with“#”can be assigned to AlOOH(JCPDS No.083-1505).

Contents lists available at ScienceDirect

journal homepage:https://www.360docs.net/doc/2e179872.html,/locate/matlet

Materials Letters

https://www.360docs.net/doc/2e179872.html,/10.1016/j.matlet.2016.06.027

0167-577X/&2016Elsevier B.V.All rights

reserved.

n Corresponding author.

E-mail address:mg_ma@https://www.360docs.net/doc/2e179872.html,(M.-G.Ma).

Materials Letters181(2016)204–207

The results con ?rmed that Ag@AgCl@AlOOH was successfully synthesized in NaOH/urea solution via a hydrothermal method.

Fig.2showed SEM (Hitachi 3400N)images and size distribu-tions of Ag@AgCl@AlOOH synthesized at different temperatures.The Ag@AgCl@AlOOH microspheres were observed with a lot of nanosheets attached to their spherical surfaces (Fig.2a ).Most of the Ag@AgCl@AlOOH microspheres showed a solid structure with a mean diameter of $5.73m m.More Ag@AgCl@AlOOH hollow microspheres with a diameter of $5.94m m appeared at 160°C,magni ?ed images gave an insight on the big hole in the interior of the microsphere (Fig.2b ).Increased the temperature to 180°C,large numbers of hollow solid microspheres with a mean diameter of $6.30m m were observed (Fig.2c ).Based on the SEM results,one can conclude that higher temperatures favored for the for-mation of hollow structures of Ag@AgCl@AlOOH and the growth of their particle size.Higher temperature could provide energy to form more nucleation sites,fast growth of Ag,AgCl,and AlOOH crystals,inducing the synthesis of Ag@AgCl@AlOOH microspheres with increasing https://www.360docs.net/doc/2e179872.html,ually,the size of samples could affect photocatalytic activity due to the change of void space in hollow structure,as well as the surface contact area with dye molecules.

102030405060

70

*: Ag

#: AlOOH

#

*220

222311220*200

*111

200

(a)

(c)I n t e n s i t y (a .u )

2 (degree)

(b)111

#

θFig.1.XRD patterns of samples synthesized at (a)140°C;(b)160°C;and (c)180°C,respectively.

Fig.2.SEM images and histograms of size distributions of same samples as in Fig.1.

Y.-Y.Dong et al./Materials Letters 181(2016)204–207205

It is worth noting that,during the heating procedure,the synthesis of Ag@AgCl@AlOOH hollow microspheres in the NaOH/urea solution involved initial nucleation,growth,aging,and ag-gregation processes.It suggested that different processes affected the phases and morphologies of samples.In the literature,Chen et al.also reported that the annealing obviously affected the mi-crostructures [18].

Fig.3showed XRD patterns of samples synthesized with dif-ferent conditions.There was a single phase of AgCl crystals with a cubic structure with deionized water (Fig.3a).There were mixed phases of Ag (marked with *)and AgCl with NaOH solution (7%,weight/weight)(Fig.3b ).AgCl crystals were obtained as major phase with urea solution (12%,weight/weight),and there was only one weak peak of the (111)plane of Ag crystals at 2θ?38.0°(Fig.3c ).The sample exhibited mixed phases of Ag (minor phase)and AgCl (major phase)with NaOH/urea solution (Fig.3d ),which

was similar to that in Fig.3c .The other diffraction peaks marked with “#”can be assigned to AlOOH (JCPDS No.083-1505).The re-sults con ?rmed that alkaline environment was conductive to the formation of Ag from Ag t.

A lot of individual AgCl particles with uniform sizes were ob-tained with deionized water (Fig.4a ).The sizes of Ag@AgCl@A-lOOH particles were signi ?cantly increased and congregates oc-curred with NaOH solution (Fig.4b).Ag@AgCl@AlOOH displayed blocky structure with heterogeneous shapes with urea solution (Fig.4c).The shape of Ag@AgCl@AlOOH was similar to sphere and consisted of lots of slender nanorods with NaOH/urea solution (Fig.4d).It is worth to note that,no Ag@AgCl@AlOOH hollow microspheres were obtained according to the above results.It means that,NaOH/urea solution played an important role in di-recting the formation of Ag@AgCl@AlOOH hollow structures.The certain amount of NaOH/urea solution could provide ideal en-vironment for the self-assembling of Ag,AgCl,and AlOOH to form hollow microspheres structures.

The photocatalytic activity of the as-prepared Ag@AgCl@AlOOH microspheres was analyzed by UV –visible spectrum,as shown in Fig.5.The original concentration of methylene orange (MO)was 10mg L à1.However,after 3h under UV irradiation,one can see that the peaks disappeared at the wavelengths of 270.5nm and 464.5nm,which correspond to the functional groups of phenyl and azo,respectively.The results showed that the as-obtained samples exhibited good photocatalytic activity and MO dye could completely degrade in 180min.

4.Conclusions

In summary,Ag@AgCl@AlOOH hollow microspheres were synthesized using a facile hydrothermal method in NaOH/urea solution.The heating temperature has an important effect on the size and morphologies of Ag@AgCl@AlOOH hollow microspheres.This synthetic strategy reported here may open a new way to synthesize other functional materials with hollow structures.

102030

405060

70

*200

*220

*: Ag #: AlOOH

#

#

222

311220

*111

200

(c)(d)(b)I n t e n s i t y (a .u )

2 (degree)

(a)

111

θFig. 3.XRD patterns of samples synthesized with (a)H 2O (10mL);(b)NaOH (10mL);(c)urea (10mL);and (d)NaOH/urea (1mL).

Fig.4.SEM images of same samples as in Fig.3.

Y.-Y.Dong et al./Materials Letters 181(2016)204–207

206

Acknowledgments

Financial support from Special Fund for Beijing Common Con-struction Project is gratefully acknowledged.

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Fig.5.The UV –visible spectra (A)and the picture (B)of the photocatalytic degradation of MO dye within 3h.

Y.-Y.Dong et al./Materials Letters 181(2016)204–207207

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这些曾经同甘共苦的同事,很舍不得,舍不得领导们的尊尊教诲,舍不得同事之间的那片真诚和友善。 在短短的两年时间我们公司已经发生了巨大可喜的变化,我很遗 憾不能为公司辉煌的明天贡献自己的力量。我只有衷心祝愿公司的业绩一路飙升!公司领导及各位同事工作顺利! (篇二) 尊敬的办公室人力资源管理领导: 我向公司正式提出辞职。 我自**日进入公司,到现在已经一年有余了,正是在这里我开始 踏上了社会,完成了自己从一个学生到社会人的转变。在过去的一 年多里,公司给予了我许多学习和锻炼的机会,开阔眼界、增长见识。我对公司给予的照顾表示忠心的感谢!但是,经过近段时间的思考, 我越来越迷惘!我越来越觉得现在的工作、生活离自己想要的越来越远。所以,我必须离开,去过我思想深处另一种有别于目前的生活。我想,生活应该是在选择到适合自己的道路以后,再持之以恒地坚持! 公司目前已经过了一年最忙的时间,是充电、整顿、储备人才的 时刻。相信,我的离开会很快有新生力量补充。因为这不是我想要的工作、生活状态,所以,我现在对工作没有激情、对生活也极其懒散。本着对公司负责的态度,为了不让公司其他同事受到我消极情绪 * ,也为了不让公司因为我出现业务上的纰漏等,我郑重向公司提出辞职,望公司给予批准! 祝公司稳步发展,祝公司的领导和同事们前程似锦、鹏程万里!

【优质】向政府写申请书范文-优秀word范文 (3页)

本文部分内容来自网络整理所得,本司不为其真实性负责,如有异议或侵权请及时联系,本司将立即予以删除! == 本文为word格式,下载后可方便编辑修改文字! == 向政府写申请书范文 向政府写申请书范文:企业向政府申请书范文 ******建设局: 为了更好的贯彻落实国家对资源综合利用的指导思想,促进合理的节约资源,提高资源利用率,保护环境实现经济社会的可持续发展的战略方针。 ************有限责任公司顺应形势发展,准备在******投资建设一条具有轻质、阻燃、保温、抗震性强并具有可持续发展的轻集料小型空心砌块建筑材 料生产线。 此项目的投资建设能达到节约能源、保护土地、变废为宝及综合治理环境 污染的目的。 投资建设此项目我公司具有以下优势: 一、轻集料小型空心砌块是以矿渣、炉渣、粉煤灰加有石硝为骨料,以水泥为胶结料,被广泛使用于工业与民用建筑的非承重砌块、承重砌块、保温块。 是一种节能、节土、利废的可持续发展的建筑材料。 该产品生产工艺无二次污染产生,市场前景广阔变废为宝,造福后代并具 有极高的社会效益和环境效益。 而我公司经营煤矿及煤炭销售多年,常年与矿渣、粉煤灰、水泥等物接触。 二、我公司为******热力公司供运供热用煤已有多年,合作非常融洽。

随着******城市建设规模的不断扩大,******热力公司现在每年冬季供热用煤需要4万多吨,为了保证冬季的正常供暖,秋季储存煤就非常关键,但是热力公司的场地有限,无法大量储存煤,加之供热产生的炉渣占地面积也很大。 为此双方约定由我公司申请30亩土地,其中一半无偿作为热力公司储煤场地,一半用于我公司建设轻集料小型空心砌块生产线使用,同时供热产生的炉渣及时运送到本厂作为生产原料。 充分体现了双方互利互惠的原则。 综上所述,建设轻集料小型空心砌块生产线,即符合国家产业政策,同时为确保******冬季正常供暖,热力公司秋季储煤的问题也得到了解决。 因此,恳请******建设局审批30亩土地作为************有限责任公司建设轻集料小型空心砌块生产线和******热力公司储煤场地为盼。 ************有限责任公司 20**年月日 向政府写申请书范文:向政府申请资金请示范文 县政府: XX镇政府办公楼建于X年X月,迄今XX年,由于该楼建筑时间长,加之建筑质量不好等原因,部分房间的墙体出现裂缝,虽小有修缮但仍存在屋顶掉块、墙围脱落等现象,该楼已存在安全隐患,不适宜继续办公,必须进行修缮。 经多方论证,修缮费用预算为XX万元,因镇政府资金短缺,特向县政府申请修缮办公楼经费,我们一定加强对招投标和工程质量的管理,指派专人负责办公楼修缮事宜,做到专款专用,严格质量、严格纪律,请予以支持为盼。 当否,请批示。 附:XX镇政府办公楼修缮预算开支一览表。 X县X镇人民政府

(H2N(C2H4)2NH2)[V4O10]ic951237c

Hydrothermal Syntheses and Structural Characterization of Layered Vanadium Oxides Incorporating Organic Cations:r-, -(H3N(CH2)2NH3)[V4O10]and r-, -(H2N(C2H4)2NH2)[V4O10] Yiping Zhang,?,?Robert C.Haushalter,*,?and Abraham Clearfield*,? NEC Research Institute,4Independence Way,Princeton,New Jersey08540,and Department of Chemistry,Texas A&M University,College Station,Texas77843 Recei V ed September26,1995X Four new layered mixed-valence vanadium oxides,which contain interlamellar organic cations,R-(H3N(CH2)2- NH3)[V4O10](1a), -(H3N(CH2)2NH3)[V4O10](1b),R-(H2N(C2H4)2NH2)[V4O10](2a),and -(H2N(C2H4)2NH2)- [V4O10](2b),have been prepared under hydrothermal conditions and their single-crystal structures determined: 1a,triclinic,space group P1h,a)6.602(2)?,b)7.638(2)?,c)5.984(2)?,R)109.55(3)°, )104.749- (2)°,γ)82.31(3)°,Z)1;1b,triclinic,P1h,a)6.387(1)?,b)7.456(2)?,c)6.244(2)?,R)99.89(2)°, )102.91(2)°,γ)78.74(2)°,Z)1;2a,triclinic,P1h,a)6.3958(5)?,b)8.182(1)?,c)6.3715(7)?,R )105.913(9)°, )104.030(8)°,γ)94.495(8)°,Z)1;2b,monoclinic,space group P21/n,a)9.360(2)?,b )6.425(3)?,c)10.391(2)?, )105.83(1)°,Z)2.All four of the compounds contain mixed-valence V5+/V4+vanadium oxide layers constructed from V5+O4tetrahedra and pairs of edge-sharing V4+O5square pyramids with protonated organic amines occupying the interlayer space. Introduction The contemporary interest in vanadium oxide bronzes reflects not only their interesting electronic and magnetic properties1 but also their complex structural chemistry,associated with the ability of vanadium to adopt a variety of coordination geometries in various oxidation states.In addition to the conventional alkali-metal bronzes A x V2O5,2a class of organic-based vanadium bronzes are also known.While most of the alkali-metal bronzes have been prepared at high temperatures,the organic-based vanadium bronzes are prepared at room temperature or slightly higher via intercalation reactions with vanadium pentoxide xerogels,V2O5?n H2O.The V2O5?n H2O host possesses a porous layered structure and is capable of intercalating a variety of neutral and charged guest species such as alkali-metal ions,3 alkylamines,4alcohols,5pyridine,6benzidine,7etc.The insertion of amines or metal complexes into V2O5hosts has also been reported.8The resulting intercalation compounds usually retain the lamellar structure with the guest species and water molecules occupying the interlayer regions.Partial reduction of V5+to V4+of the oxide layers has been observed to accompany the intercalation reactions with organic amines.In the cases of aniline9and thiophene,10the reduction of the vanadium oxide host,and the simultaneous oxidative polymerization of the guest molecules in the interlayer regions,have been observed.These intercalation compounds with reduced vanadium sites constitute an interesting class of organic-inorganic composite materials that can be viewed as molecular or polymer vanadium bronzes by analogy to alkali-metal bronzes.2However,the structural information about these intercalation compounds is very limited due to their amorphous or semicrystalline nature and lack of high-quality single crystals. Hydrothermal techniques,in combination with organic tem-plates,have been recently demonstrated to be well suited for the synthesis and crystal growth of reduced oxomolybdenum and oxovanadium phosphates and vanadium phosphonates.A series of novel organically templated molybdenum and vana-dium phosphates and vanadium phosphonates with molecular, two-dimensional layered,and three-dimensional open-frame-work structures have been prepared under hydrothermal condi-tions.11In contrast,hydrothermal synthesis of vanadium oxides using organic templates remains relatively unexplored.12While there are many examples of alkali-metal vanadium oxide bronzes with three-dimensional or two-dimensional structures in which the alkali metals occupy the channels or the interlayer regions, analogous organically templated vanadium oxides with3-D open *To whom all correspondence should be addressed. ?Texas A&M University. ?NEC Research Institute. X Abstract published in Ad V ance ACS Abstracts,August1,1996. (1)Murphy,D.W.;Christian,P.A.Science1979,205,651. (2)Hagenmuller,P.In Non-Stoichiometric Compounds,Tungsten Bronzes, Vanadium Bronzes and Related compounds;Bevan,D.J.,Hagen-muller,P.,Eds.;Pergamon Press:Oxford,U.K.,1973;Vol.1. (3)Lemordant,D.;Bouhaouss,A.;Aldebert,P.;Baffier,N.Mater.Res. Bull.1986,21,273. (4)Paul-Boucour,V.;Aldebert,P.Mater.Res.Bull.1983,18,1247. (5)Aldebert,P.;Baffier,N.;Legendre,J.-J.;Livage,J.Re V.Chim.Miner. 1982,19,485.Aldebert,P.;Baffier,N.;Gharbi,N.;Livage,J.Mater. Res.Bull.1981,16,949.Lemordant,D.;Bouhaouss,A.;Aldebert, P.;Baffier,N.J.Chim.Phys.Phys.-Chim.Biol.1986,83,105. (6)Ruiz-Hitzky,E.;Casal,B.J.Chem.Soc.,Faraday Trans.11986,82, 1597. (7)Hasbah,H.;Tinet,D.;Crespin,M.M.;Erre,R.;Setton,R.;Van Damme,H.J.Chem.Soc.,https://www.360docs.net/doc/2e179872.html,mun.1985,935. (8)Kanatzidis,M.;Marks,T.J.Inorg.Chem.1987,26,783and references therein. (9)Kanatzidis,M.;Wu,C.-G.J.Am.Chem.Soc.1989,111,4139. (10)Kanatzidis,M.;Wu,C.-G.;Marcy,H.O.;DeGroot,D.C.;Kannewurf, C.R.Chem.Mater.1990,2,222. (11)Haushalter,R.C.;Mundi,L.A.Chem.Mater.1992,4,31.Soghomo- nian,V.;Chen,Q.;Haushalter,R.C.;Zubieta,J.;O’Connor,C.J. Science1993,259,1596.Soghomonian,V.;Chen,Q.;Haushalter,R. C.;Zubieta,J.Angew.Chem.,Int.Ed.Engl.1993,32,610.Soghomo- nian,V.;Chen,Q.;Haushalter,R.C.;Zubieta,J.Chem.Mater.1993, 5,1690.Soghomonian,V.;Chen,Q.;Haushalter,R.C.;Zubieta,J., Chem.Mater.1993,5,1595.Soghomonian,V.;Haushalter,R.C.; Chen,Q.;Zubieta,J.Inorg.Chem.1994,33,1700.Zhang,Y.; Clearfield,A.;Haushalter,R.C.J.Solid State Chem.1995,117,157. Zhang,Y.;Clearfield,A.;Haushalter,R.C.Chem.Mater.1995,7, 1221. (12)Huan,G.-H.;Johnson,J.W.;Jacobson,A.J.;Merola,J.S.J.Solid State Chem.1991,91,385.Duan,C.-Y.;Tian,Y.-P.;Lu,Z.-L.;You, X.-Z.;Huang,X.-Y.Inorg.Chem.1995,34,1. 4950Inorg.Chem.1996,35,4950-4956 S0020-1669(95)01237-7CCC:$12.00?1996American Chemical Society

辞职申请书范文大全500字

辞职申请书范文大全500字 辞职申请书500字 辞职一般是提前30天向上级或公司递交辞职,无需公司批准,30天之后您就能顺利辞职了,以下是为大家搜集的范文,欢迎阅读! 尊敬的公司领导: 由于工作调动,现正式向公司提出调离原工作岗位。 舍不得,舍不得这里的人,舍不得自己曾经的付出。每一次出差、每一次报价、每一次谈判、每一次争吵,在飞机上、在吉普车上、在会议室里、在工地上,所有这一切,都充斥着我的记忆,那么清晰,就像是在昨天。但时间的指针总是忠诚地一步一步往前走,昨天终究会结束。 在公司四年半的时间里,我收获了很多,除了朋友和知识,更 重要的是,我到了成长的快乐。感谢命运,让我在最青春的年华里遇到了装备公司;感谢公司领导,你们的关注和欣赏让我一直充满自信,你们的指点和教诲让我在成长的路上少走了很多弯路;感谢公司的同事,和你们的沟通,轻松愉悦;感谢我自己,能够一直保持着一份纯净,真诚地付出,真诚地享受每一次收获。

鉴于目前的身体及生活状态,自认为不能够为公司创造更大的价值,现向公司提出辞职。 虽然我不能在这里继续“战斗”下去,但真心的希望,xx公司能够梦想成真,在世界的舞台上舞出属于自己的精彩。 此致 敬礼! 辞职人: 20xx年xx月xx日 尊敬的x总: 您好! 转眼间,我到公司已有X年了,这X年的工作时间里,虽然我的工作并不是尽善尽美,但在公司同事们的帮助,尤其是您的信任与教导下,我也努力的去完成每一项您布置给我的工作,都用了自己的

热情努力去对待。凭心而论,我开始对基础工程毫无了解,但在您这里我基本了解了基础工程,使我学到了很多东西,特别是一些做人的道理和对生活的理解。在这里,我真诚的对袁总说一声:谢谢您了! 但犹豫再三,经过了长时间的考虑,我还是写了这封辞职申请书。 加入公司以来,您对我的信任、教导与严格要求,令我非常感动,也成为激励我努力工作的动力。在您及同事们的热心指导与悉心帮助下,我在工程技术和管理能力方面都有了一定的提高。我常想,自己应该用一颗感恩的心,去回报您及公司对我的栽培,真的想用自己的努力去做好您交给的每一份工作任务,但自己的能力真的很有限,有很多地方没有做得能让您满意,所以对过去工作中失误与不足的地方,我真诚的对您说声抱歉,请您原谅! 经过这段时间的思考,我觉得我可能技术能力方面有所不足, 也缺少工作的积极性和脚踏实地的工作精神,没能很好的适应这个工作,所以一直没有把工作做到令您满意的程度。这是我在以后的人生中需要注意的地方,也是袁总经常教导我的地方,我一定会铭记于心! 再一次真诚地感谢您及公司全体同事对我的关爱与帮助!

Geological and isotopic evidence for magmatic-hydrothermal

ARTICLE Geological and isotopic evidence for magmatic-hydrothermal origin of the Ag –Pb –Zn deposits in the Lengshuikeng District,east-central China Changming Wang &Da Zhang &Ganguo Wu & M.Santosh &Jing Zhang &Yigan Xu &Yaoyao Zhang Received:7August 2012/Accepted:27March 2014/Published online:8April 2014#Springer-Verlag Berlin Heidelberg 2014 Abstract The Lengshuikeng ore district in east-central China has an ore reserve of ~43Mt with an average grade of 204.53g/t Ag and 4.63%Pb+Zn.Based on contrasting geological characteristics,the mineralization in the Lengshuikeng ore district can be divided into porphyry-hosted and stratabound types.The porphyry-hosted minerali-zation is distributed in and around the Lengshuikeng granite porphyry and shows a distinct alteration zoning including minor chloritization and sericitization in the proximal zone;sericitization,silicification,and carbonatization in the periph-eral zone;and sericitization and carbonatization in the distal zone.The stratabound mineralization occurs in volcano-sedimentary rocks at ~100–400m depth without obvious zoning of alterations and ore minerals.Porphyry-hosted and stratabound mineralization are both characterized by early-stage pyrite –chalcopyrite –sphalerite,middle-stage acanthite –native silver –galena –sphalerite,and late-stage pyrite –quartz –calcite.The δ34S values of pyrite,sphalerite,and galena in the ores range from ?3.8to +6.9‰with an average of +2.0‰.The C –O isotope values of siderite,calcite,and dolomite range from ?7.2to ?1.5‰with an average of ?4.4‰(V-PDB)and from +10.9to +19.5‰with an average of +14.8‰ (V-SMOW),respectively.Hydrogen,oxygen,and carbon iso-topes indicate that the hydrothermal fluids were derived main-ly from meteoric water,with addition of minor amounts of magmatic water.Geochronology employing LA –ICP –MS analyses of zircons from a quartz syenite porphyry yielded a weighted mean 206Pb/238U age of 136.3±0.8Ma considered as the emplacement age of the porphyry.Rb –Sr dating of sphalerite from the main ore stage yielded an age of 126.9±7.1Ma,marking the time of mineralization.The Lengshuikeng mineralization classifies as an epithermal Ag –Pb –Zn deposit. Keywords Stable isotope .Geochemistry .Porphyry .Stratabound .Ag –Pb –Zn .Lengshuikeng Introduction The Lengshuikeng ore district,located in the Jiangxi Province of east-central China (Fig.1a ),contains more than 50ore bodies belonging to seven deposits hosted in granite porphyry,pyroclastic,and carbonate rocks.The ore reserves in Lengshuikeng have been estimated at ~43Mt with average grades of 2.11%Pb,2.61%Zn,204.53g/t Ag,0.08g/t Au,and 0.01%Cd.The ores can be grouped into two types:(1)porphyry-hosted (Yinluling,Baojia,and Yinzhushan)and (2)stratabound (Xiabao,Yinkeng,Yinglin,and Xiaoyuan).The porphyry-hosted mineralization is distributed within and around the Lengshuikeng granite porphyry,whereas the stratabound mineralization occurs in volcano-sedimentary rocks at ~100–400m depth.The spatial distribution of the porphyry-hosted and stratabound ore bodies,their mineral constituents,and the zoning of alteration assemblages are markedly different from those of typical porphyry deposits. Editorial handling:T.Bissig and G.Beaudoin C.Wang (*): D.Zhang :G.Wu :M.Santosh :J.Zhang :Y .Xu :Y .Zhang State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,No.29,Xueyuan Road,Beijing 100083,People ’s Republic of China e-mail:wcm233@https://www.360docs.net/doc/2e179872.html, Y .Xu No.912Geological Surveying Team,Bureau of Geology and Mineral Exploration and Development,Yingtan 334000,China Miner Deposita (2014)49:733–749DOI 10.1007/s00126-014-0521-8

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