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Table of Content
20 May 1994, Volume 12 Issue 2
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PHOTOCATALYTIC OXIDATION OF SO
2
IN AQUEOUS SUSPENSION OF ZnO.WO
3
WANG ZENG-HUA, ZHUANG, QI-XING
1994, 12(2): 97-103. DOI:
10.7517/j.issn.1674-0475.1994.02.97
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The photocatalytic oxidation of pollutant SO
2
in aqueous suspension of ZnO·WO
3
under visible light irradiation was investigated and an air flowing was proposed to treatconcentrated SO
3
2-
solution. The SO
3
2-
,contained in an aqueous solution of 0.15 mol/L,was almost photocatalytically oxidized to produce SO
4
2-
within 2h irradiation.In photoassisted spontaneous oxidation of SO
3
2-
,such coexistent reactions as spon-taneous,heterogeneously catalytic,photochemical and photocatalytic reactions hclVe beencompared by experiments.Gram molecular ratio 0.5 ZnO·WO
3
was chosen to be the opti-mal doping ratio.The effect of the heat treatment of photocatalyst,air flowing and pH onphotocatalytic activity has been determined and pH7.5 was identified to be the optimal.Solar photocatalytic oxidation of SO
3
2-
shows the faster reaction rate than that in indoorexperimentst which develops a better prospects for the application of solar photocatalysisto environmental protection,All experimental results are explained in theory.A reactionmechanism has been proposed in detail.
PHOTOCHEMICAL BEHAVIOR OF ETHYL
p
(N,N-DIMETHYLAMINO) CINNAMATE IN MOLECULAR AGGREGATE
WANG XIU-ZHI, LEI YI-XIONG, SoNG HUAI-HAI, LI MIAO-ZHEN, WANG ER-JIAN
1994, 12(2): 104-109. DOI:
10.7517/j.issn.1674-0475.1994.02.104
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The spectroscopic and Photochemical properties of ethyl
p
(N,N-dimethylamino)cinnamate(DMAC)in dodecanoic acid(LA)aggregate were reported.DMAC displays typical intramolecular charge transfer character in the absorption and emission spectra. The excimer fluoresceuce of DMAC Was observed in the presence of dodecanoic acid.The emissionintensity increases with the increaise of concentration of DMAC. The photodimerizationrate of DMAC becomes much greater in the dodecalloic acid aggregate than that in common solution. The results obtained from monitoring reaction process by using fluorescencespectroscopy show that the excimer of DMAC possesses higher photochemical activity thanthat of DMAC monomer.
A STUDY ON THE PHOTOCHEMICAL REACTION OF(4-N,N-DIMETHYL-AMINE)-PHENYL-N-PHENYL NITRONE IN POLYMER FILM
DIAO Li, HE GUANG-QIAN, WU SHI-KANG
1994, 12(2): 110-114. DOI:
10.7517/j.issn.1674-0475.1994.02.110
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Photocyclization of(4-N,N-dimethylamine)-Phenyl-N-phenyl nitrone(DMAPN)un-der UV-irradiation will cause change in refrative index in various environments. Therefractive index of the title compound in different matrix decreases along with the increaseof the irradiation time. The photochemical reaction of DMAPN in polymer film is affectedby the molecular weight of the polynier.The result indicates that the photochemical re- action of this compound does not depend upon the molecular weight of polymer in lowmolecular weight region,but decreases with the increase of the molecular weight of polymerin high molecular weight region.
ELECTROPHOTOGRAPHIC CHARACTERISTICS OF THE PHOTORECEPTOR DEViCE CONSISTING OF ClInPc/(PVK-TPD)
HU QING-MEI, HUANGC DE-BEN
1994, 12(2): 115-119. DOI:
10.7517/j.issn.1674-0475.1994.02.115
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The photoelectroconductivity of a double-layered photoreceptor (P/R) was studiedin the paper,in which the chloroinduim phthalocyanine(ClInPc)was a carrier gen-eration layer and polyvinyl carbazole (PVK) incoporating tetraphenyl benzidine (TPD) as,a carrier transportation layer. Results of the P/R consisting of ClInPc/PMMA (30%) matched with TPD/PVK (1:1) shows excellent protoelectronic properties:acceptance po-tential,V
max
(800V);residual potential,V
min
(30V/s);dark decay,RD (<50V/s);light dis-charge,△V
t
(ls) >70%;half decay,
t
1/2
(ls)=0.30~0.53. Simultaneously the photoelectronicproperties of the P/R device in which the CGL is made by means of evaporating at vacuumare better than that of other method.
STUDY ON THE RECOVERY OF HYDROGEN FROM PHOTOCATALYTIC DECOMPOSITION OF HYDROGEN SULFIDE
ZHANG YI-HUA, TENG YU-MEI, ZENG XIAN-KANG, WANG HAN-HUI, YU JIA-YONG
1994, 12(2): 120-125. DOI:
10.7517/j.issn.1674-0475.1994.02.120
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The Photocatalytic cleavage of H
2
S into H
2
was studied in a continuous flow systemand alkaline aqueous solution under the illumination of Xe-lamp.CdS,V
2
O
5
/TiO
2
andV
2
O
5
/Al
2
O
3
were used as catalysts. The hydrogen amount was measured as a functionof the amount of NaOH in the aqueous solution and the irradiation time.The reactionmechanism of the photocatalytic decomposition of hydrogen sulfide was discussed.Theresults show that this continuous flow method is feasible and more near the practicalsituation in decomposition of hydrogen sulfide.
INVESTIGATION ON THE ELECTROCHEMICAL AND PHOTOINDUCED REDUCTION OF 13-SO
3
Na-DDHA
WANG WEI-BO, AN JING-YI, LI XUE-PING, XIAO XU-RUI
1994, 12(2): 126-132. DOI:
10.7517/j.issn.1674-0475.1994.02.126
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The electrochemical redox behavior of compound 13-SO
3
Na-DDHA in buffer solution of different pH values repertively has been studied. There is a linear relationship between the reduction potential of carbonyl group and pH value.The slope of this line is about 60mV/pH. This result corresponds to one step 2-electron,2-proton reduction process:Q+2H
+
+2e=QH
2
. As a polar but non-proton solvent,DMF is favorable for radicalstabilization. If DMF is added to a buffer solution,this compound may be reduced by twostep one-electron processes.
THE PHOTO ELECTROCHEMICAL STUDIES OF ELECTRODEPOSITION Cu
2x
In
2-2x
Se
2
THIN FILMS
CHEN MING-Bo, DENG XUN-NAN, You JIN-KUA
1994, 12(2): 133-139. DOI:
10.7517/j.issn.1674-0475.1994.02.133
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Cu
2x
In
2-2x
Se
2
thin films were prepared by electrodeposition method and characterized by EDAX.The photoelectrochemical behaviour,spectral responset and the dependence of bandgap on x values were studied.SLS (Scanning Laser Spot) was used to observe the effects of annealing treatment,film thickness,and polarization under illumination on photo electrochemical properties of films.The effective dipping in Pb(NO
3
)
2
solution on photo electrochemical behaviour were also studied.
PHOTOINDUCED CATIONIC POLYMERIZATION OF EPOXIDES INITIAIED WITH IRON-ARENE COMPLEX
CHEN YoNG-LIE, CHEN Xu-DONG, LIANG ZHAO-XI
1994, 12(2): 140-145. DOI:
10.7517/j.issn.1674-0475.1994.02.140
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The polymerization kinetics and temperature effect on photoinduced cationic polymerization of p-cresylglycidylether (CGE) initiated with cyclopentadienyl-cumene-iron hexaflu-orophosphate was studied using isothermal DSC method.It is shown that the polylnerization rate and ultimate conversion are the maxima at around 55℃ and 45℃, respectively.The polymerization rate of CGE is proportional to CGE concelitration. Two basic reactionsare involved in the polymerization process,i.e., the complexation of the photolytic productof photoinitiator with the monomer and the ring-opening reaction of monomer startingfrom the complex formed.The temperature effect on these two reactions is opposite,i.e.,higher temperature is favorable for the latter but disadvantageous for the former.
STUDY ON MECHANISM OF SUPERSENSITIZATION OF SOME ALLOPOLAR TRINUCLEAR CYANINE DYES
ZHANG JIN-LONG, CHEN LIAN-SHEN, ZHU ZHENG-HUA
1994, 12(2): 146-149. DOI:
10.7517/j.issn.1674-0475.1994.02.146
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ESR studies have been made on the supersensitization of naphthothiacarbocyanine NTCC by some holopolar trinuclear cyanine dyes TNC.
1994, 12(2): 150-165. DOI:
10.7517/j.issn.1674-0475.1994.02.150
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THE SYNTHESIS AND PHOTOINDUCED INTRAMOLECULAR CHARGE TRANSFER INTERALCTION OF ZNIC 2,9,16,23-TETRAKIS[4-(
p
-DIMETHYLAMINOPHENOXY)] PHTHALOCYANINE
SHEN SHU-YIN, LIU KAI, ZHOU QING-FU, XU HUI-JUN
1994, 12(2): 166-169. DOI:
10.7517/j.issn.1674-0475.1994.02.166
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Znic 2,9, 16,23-tetrakis[4-(
p
-dimethyaminophenoxy)] Phthalocyanine(AmZmPc)has been synthesized. Intermolecular and intramolecular quenching of phthalocvanine fluorescence by
p
-N,N-dimethylanisidine has been studied.It is concluded the diminutionsof fluorescence quantum yield and life-time of Ⅱ are attributed to intramolecular chargetransfer. The apparent transfer rate constants were calculated.
SUDIES ON THE STURCTURES AND ELECTRICAL PROPERTIES OF EVAPORATED FILM OF 3-CYANO-5[2-(3-ETHYL-2-BENZOTHIZOLIDENE ETHYLIDENE)]-4-PHENPL-2(5H)FURANONE
1994, 12(2): 170-176. DOI:
10.7517/j.issn.1674-0475.1994.02.170
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The title compound is a merocyanine dye.It is a promising photo-electric and nonlinear optical material.It is found that the dark and photo conductivity in the polycrystalline evaporated thin film of this dye is several hundred times higher than that in the amosphous evaporated thin film. But the dark and photo conductivity in the single crystal is higher than that in the polycrystalline evaporated thin film.In this paper,the characterization,structure of single crystal and preparation of evaporated film of the dye were described.The relationship between structure and electronic conducting behaviour of this dye was investigated.This electronic conducting mechanism of the thin film was discussed.
pH EFFECT OF 0
2
PHOTOUPTAKE IN AQUEOUS SUSPENSION OF CdS
1994, 12(2): 177-181. DOI:
10.7517/j.issn.1674-0475.1994.02.177
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The pH effect of photouptake of O
2
on CdS and Pt/CdS was investigated. The resultindicates that there are two types of mechanism for O
2
photouptake aqueous dispersions of CdS and Pt/CdS. In acidic condition,O
2
photouptake proceeds continuously and canbe described with 1st order rate equation. In basic condition,O
2
photouptake ceaises afterhalf an hour irradiation,which is illustrated by following equations: CdS+2O
2
2-
+2h
+
→Cd
2+
+SO
4
2-
Cd
2+
+2OH
-
→Cd(OH)
2
Then,the surface of CdS is covered by Cd(OH)
2
and the O
2
uptake is hindered.
STUDY ON THE FLUORESCENCE SPECTRA OF 3,4,9,10-TETRAMETHYLPERYLENE
1994, 12(2): 182-186. DOI:
10.7517/j.issn.1674-0475.1994.02.182
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The fluorescence spectra of 3,4,9,10-tetramethylperylene(TMP)has been studied by means of steady-state and transient fluorescence measurements and compared withthat of perylene(PE).The fluorescence of TMP and PE can be quenched by nitromethane,nitrobenzene and 4-nitrobenzaldehyde,and the quanching efficiency wais increased withthe increase of the electro-withdrawing ability of the quanchers.The derivation of
F
0
/
F
from Stern-volmer equation was explained in terms of active sphere and the quanchingmechanism has been discussed, From the excitation spectrum,the charge transfer complexbrmed between TMP and tetrabutylammonium hexafluoroarsonate in electrochemical cellhas been detected.
THE STUDY OF PHOTOELECTRIC EFFECT IN CHLOROPHYLL AND DYES SYSTEM
1994, 12(2): 187-192. DOI:
10.7517/j.issn.1674-0475.1994.02.187
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Chlorophlla (Chla) was electrodeposited on SnO
2
optical transparent electrode from isooctane-chl a solution to form chl a/SnO
2
which was used as working electrode(WE)inthe photo electrochemical cell and another SnO
2
as counter electrode. The cell contained aqueous solution of dyes and triethanolamine (TEOA).As the light source,a 150W halogenlamp was used.The curves of working voltage vs working current were meaisured underthe potential of chl a/SnO
2
electrde controlled by means of a potentiostat. Accordingto the curves,open-circuit voltage (
V
oc
),short-circuit current (
I
sc
) and filling factoretc. were obtained.The change of photovoltage and photocurrent under illumination weremeasured.The output characters of photovoltage and photocurrent were obtained. Theresults indicated that Safranine T(ST) and halogenated fluorescein derivatives (FXn) hada great effect on the photoelectric parameters of the cells. The
V
oc
of the cell was about 6-8 times higher than that of the cells without ST and FXn.The increases of
V
oc
and
I
sc
were illustrated by the photoelectric effects of ST and chl a dihydrated aggregates andtheir absorption spectra. The mechanism of photoelectric effects was discussed throughthe output characters of photovoltages and photocurrents.
