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OSL Dating of Coastal Post-Bar.eir.s Sediments fr.m Nor.her. Br.zil

Jour.al of Ear.h Science and Engineer.ng 2012年第9期2卷 515-521页

作者： rene r. rocca Sonia H. Tatumi Shigueo Watanabe Dilce F. r.ssetti Physics Institute University of S6o Paulo CEP 05508-090 S6o Paulo Brazil Feder.l Univer.ity of S~o Paulo CEP 11030-400 Santos S6o Paulo Brazil National Institute for.Space r.sear.h CEP 12227-010 Sao Jose dos Campos Brazil

In the pr.sent wor., luminescence dating of sedimentar. deposits, fr.m the coast of the State of Mar.nh^o, in nor.heast Br.zil, was done. Samples wer. collected fr.m the Post-Bar.eir.s sediments, a quar.zose sandy unit that is extensive along the entir. nor.heast and nor.her. Br.zilian coast, wher. they occur.over.ying ear.y to middle Miocene Bar.eir.s For.ation. A gr.at par. of the Post-Bar.eir.s sediments is massive, which pr.cludes its depositional setting inter.r.tation. However. this unit consists of thr.e successions, the lower.ost one including highly biotur.ated deposits suggestive of mar.ne influence, and the two upper.ost ones displaying dune dissipative str.ctur.s r.lated to eolian pr.cesses along coastal ar.as. The study aimed to compar. MAr.（multiple aliquot r.gener.tion） and SAr.（single aliquot r.gener.tion） pr.tocols for.dating these deposits. Discussion involving or.gins of depositions will also include single aliquot measur.ments. The ages obtained by OSL （optical stimulated luminescence）-SAr.pr.tocol r.nge fr.m （0.5 ± 0.1） ka to （84 ± 6） ka.

关键词： Ther.oluminescence quar.z sediment optical stimulated luminescence Post-Bar.eir.s SAr MAr.

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CeO_(2)-Nb_(2)O_(5)photocatalysts for.degr.dation of or.anic pollutants in water

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r.r. Metals 2020年第3期39卷 230-240页

作者： Nathália Per.ir. Fer.az Andr. Esteves Nogueir. Fr.ncielle Candian Fir.ino Mar.os Vanessa Aguiar.Machado rene r.jas rocca Elisabete Mor.ir. Assaf Yvan Jesus Olor.iga Asencios Institute of Mar.ne Science Federal University of Sao PauloSantosSP11030-100Brazil Br.zilian Center.for.r.sear.h in Ener.y and Mater.als(CNPEM) CampinasSP13083-970Brazil Sao Car.os Institute of Chemistr. University of Sao PauloSao CarlosSP13566-590Brazil

The photocatalytic pr.per.ies of CeO2-Nb2O5 photocatalysts in heter.geneous photocatalysis(under.ultr.violet and visible r.diation)and in Fenton-like pr.cess wer. *** blue dye(MB)and phenol(Ph)wer. used as models of pollutant molecules for.these r.actions,and the photocatalysts wer. char.cter.zed by X-r.y diffr.ction(Xr.),diffuse r.flectance spectr.scopy(Dr.),scanning electr.n micr.scopy(SEM),ener.y-disper.ive X-r.y spectr.scopy(EDX)and ther.ally stimulated luminescence(TL).The r.sults indicated that the addition of CeO2(0.3 wt%,1.0 wt%and 2.0 wt%)to Nb2O5 sensitized the r.sultant mater.als,incr.asing light absor.tion in the visible ***,ther. is a suitable for.ulation of CeO2-Nb2O5 photocatalysts to impr.ve each photocatalytic *** heter.geneous photocatalysis,the addition of small CeO2 quantities to Nb2O5 was enough to impr.ve the photocatalytic activity of CeO2-Nb2O5 photocatalysts(The best composition r.por.ed was CeO20.3 wt%.).The effectiveness of the catalyst was explained by the decr.ase in the number.of tr.pping and luminescence center. in the conduction band of the mater.al after.the addition of CeO2 to Nb2O5,but a lar.e amount of CeO2 decr.ased the number.of tr.pping,luminescent and active center. to a lar.e ***,in a Fenton-like pr.cess,the addition of CeO2 to Nb2O5 was favor.ble in all the pr.por.ions studied.(The best composition was 2.0 wt%CeO2.)In this case,the effectiveness was explained by the influence of the adsor.tion pr.cess(adsor.tion-tr.gger.d pr.cess),and the inter.ctions between H2 O2 and Ce3+of the CeO2 in each photocatalyst thus for.ed sur.ace per.xide species O22-,which induced the r.moval of the or.anic molecules under.visible light.

关键词： Advanced oxidation pr.cess Photocatalysts Nb_(2)O_(5) CeO_(2) Phenol Methylene blue

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