- Rhodamine B degradation and reactive oxygen species generation by a ZnSe-graphene/TiO2 sonocatalyst
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Nanostructured ZnSe-graphene/TiO2 was synthesized by a hydrothermal-assisted approach. ZnSe-graphene/TiO2 exhibited favorable adsorption of rhodamine B, a wide wavelength absorption range, and efficient charge separation. Reactive oxygen species were generated by the oxidation of 1,5-diphenyl carbazide to 1,5-diphenyl carbazone. The sonocatalytic reaction mechanism was proposed. These findings potentially broaden the applications of sonocatalytic technologies.
- Zhu, Lei,Jo, Sun-Bok,Ye, Shu,Ullah, Kefayat,Oh, Won-Chun
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- Spectroscopic analyses on ROS generation catalyzed by TiO2, CeO2/TiO2 and Fe2O3/TiO2 under ultrasonic and visible-light irradiation
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In this work, the TiO2, CeO2/TiO2 and Fe2O3/TiO2 powders were irradiated, respectively, by ultrasound and visible-light, and the generation of reactive oxygen species (ROS) were estimated by the method of Oxidation-Extraction Photometry (OEP). That is, the 1,5-diphenyl carbazide (DPCI) can be oxidized by generated ROS into 1,5-diphenyl carbazone (DPCO), which can be extracted by mixed solvent of benzene and carbon tetrachloride. The DPCO extract liquor displays an obvious absorbance at 563 nm wavelength. In addition, some influencing factors, such as (ultrasonic or visible-light) irradiation time, catalyst addition amount and DPCI concentration, on the generation of ROS were also reviewed. The results indicated that the quantities of generated ROS increase with the increase of (ultrasonic or visible-light) irradiation time and catalyst addition amount. Moreover, the displayed quantities of ROS are also related with DPCI concentration. And then, several radical scavengers were used to determine the kinds of the generated ROS. At last, the researches on the sonocatalytic and photocatalytic degradation of several organic dyes have also been performed. It is wished that this paper might offer some important subjects for broadening the applications of sonocatalytic and photocatalytic technologies in future environment treatment.
- Zou, Mingming,Kong, Yumei,Wang, Jun,Wang, Qi,Wang, Zhiqiu,Wang, Baoxin,Fan, Ping
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- Solid state selective synthesis of diaryl carbazone
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The selective synthesis of diaryl carbazone using K3Fe(CN)6 as oxidant under alkaline condition in solid state is reported for the first time. Eight diaryl carbazone have been synthesized in excellent yields, and this method only needs cheap reagents, and simple procedure under mild condition.
- Xiao,Wang,Zhou
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- Protein damage and reactive oxygen species generation induced by the synergistic effects of ultrasound and methylene blue
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The sonodynamic damage to protein in the presence of methylene blue (MB) and the various influencing factors including ultrasonic irradiation time and MB concentration on the damage of protein were studied by fluorescence and absorption spectra. In addition, the mechanisms of the synergistic effects of ultrasound and MB were studied by oxidation-extraction photometry with several reactive oxygen species (ROS) scavengers. The results indicated that the damage of protein induced by the synergistic effects of ultrasound and MB were more serious than those that ultrasound or MB alone was applied. The damage of protein could be mainly due to the generation of ROS. The damage degree of protein increased with the increase of ultrasonic irradiation time and MB concentration because of the increased quantities of ROS generation. Both 1O2 and OH were the important mediators of the ultrasound-inducing protein damage in the presence of MB.
- He, Ling-Ling,Wang, Xin,Wu, Xiao-Xia,Wang, Yong-Xia,Kong, Yu-Mei,Wang, Xin,Liu, Bing-Mi,Liu, Bin
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- Rapid synthesis of diaryl carbazone by N-bromosuccinimide and pyridine as the oxidation system
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A new and rapid synthetic method of diaryl carbazone (ArN=NCONHNHAr) from aryl substituted carbazide is reported for the first time. Eight of the compounds were prepared by oxidation of aryl substituted carbazide using N- Bromosuccinimide and pyridine as the oxidation system in good yield under mild condition. This method only need simple instrument and short reaction time. A possible mechanism is suggested.
- Wang, Yu-Lu,Duan, Zhi-Fang,Shi, Lei,Wang, Xiao-Yang,Li, Jian-Ping
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- An efficient and convenient procedure for preparation of diaryl carbazone from aryl substituted carbazide
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A new facile method for the synthesis of diaryl carbazone (ArN=NCONHNHAr) from aryl substituted carbazide is described. Eight of the compounds were preparated by oxidation of aryl substituted carbazide with ferric chloride in acid medium at room temperature in good yield.
- Wang, Yulu,Shi, Lei,Jia, Xueshun,Pan, Feng,Ma, Donglan,Wang, Xiaoyang
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- A facile preparation of graphene-based MxSy visible light driven photocatalyst and study of photochemically generating of oxygen species
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The as-synthesized graphene-MxSy (Sb2S3, MnS2, SnS) composites via a facile hydrothermal method efficiently catalyzed the photodegradation of methylene orange (MO) with high concentration in aqueous solutions under visible light irradiation. The generation of reactive oxygen species were detected through the oxidation reaction from 1,5-diphenyl carbazide (DPCI) to 1,5-diphenyl carbazone (DPCO). Based on the high photocatalytic activity, the graphene-SnS composite can be expected to be a practical visible light photocatalyst.
- Zhu, Lei,Sarkar, Sourav,Ye, Shu,Ullah, Kefayat,Meng, Ze-Da,Oh, Won-Chun
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- Bubble template synthesis of CdLa2S4 hollow spheres/reduced graphene oxide nanocomposites as efficient and sustainable visible-light driven photocatalysts
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A hollow sphere CdLa2S4/reduced graphene oxide (rGO) composite was successfully synthesized for the first time via a simple microwave assisted hydrothermal approach using bubbles generated from the decomposition of NH3H2O and Na2S2O3 in a domestic microwave oven within several minutes. The large number of catalytic active sites together with the advantages of the hollow structure makes the as-synthesized CdLa2S4/rGO composite an efficient catalyst for the degradation of rhodamine B (RhB) and industrial dyes such as Texbrite BA-L (TBA) at high concentration in aqueous solutions. The oxidation reaction of 1,5-diphenyl carbazide (DPCI) by a generated reactive oxygen species (ROS) that has very strong oxidizing power could be attributed to the excellent photoinduced charge separation abilities and observed red shift in these hybrid semiconductor materials. Moreover, the synthesized catalyst can be easily recovered and reused for at least four cycles due to its good stability. The results confirm that as-synthesized CdLa2S4/rGO composites are promising potential candidates for high-performance visible light driven photocatalyst materials.
- Zhu, Lei,Oh, Won-Chun
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p. 90321 - 90334
(2015/11/11)
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- Efficient and convenient deprotection of thiocarbonyl to carbonyl compounds using 3-carboxypyridinium and 2,2′-bipyridinium chlorochromates in solution, dry media, and under microwave irradiation
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A synthetic utility of 3-carboxypyridinium (CPCC) and 2,2′- bipyridinium (BPCC) chlorochromates in deprotection reactions is reported. Different types of thioamides, thioureas, thiono esters, and thioketones are deprotected to their corresponding carbonyl compounds with these reagents in good to excellent yields. The reactions were carried out in solution, under solvent-free conditions, and under microwave irradiation. The results show that with both reagents the rates of the reactions and the yields are usually highest under microwave irradiation. Springer-Verlag 2003.
- Mohammadpoor-Baltork, Iraj,Memarian, Hamid Reza,Bahrami, Kiumars
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p. 411 - 418
(2007/10/03)
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- A convenient and inexpensive method for conversion of thiocarbonyl compounds to their oxo derivatives using oxone under solvent-free conditions
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A series of thioamides, thioureas and thioesters are transformed to their corresponding carbonyl compounds in good to excellent yields with oxone under solid phase conditions, while thioketones remained unchanged under these conditions.
- Mohammadpoor-Baltork, Iraj,Sadeghi, Majid M.,Esmayilpour, Karim
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p. 953 - 959
(2007/10/03)
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- Convenient transformation of thiocarbonyl to carbonyl group using benzyltriphenylphosphonium and n-butyltriphenylphosphonium peroxodisulfates
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Benzyltriphenylphosphonium and n-butyltriphenylphosphonium peroxodisulfates are stable and easily prepared oxidising agents. These reagents are able to convert different thioamides and thioureas to their oxygen analogues in good to excellent yields. Thiono esters are also transformed to esters in high yields. Thioketones such as thiobenzophenone and thiofluorenone are converted to their ketones in high yields while, 4-nitrothiobenzophenone, 2-aminothiobenzophenone and 4-chlorothiobenzophenone remained intact in the reaction mixture.
- Mohammadpoor-Baltork, Iraj,Sadeghi, Majid M. M.,Esmayilpour, Karim
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p. 348 - 350
(2007/10/03)
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- Selective conversion of thioamides and thioureas to their oxygen analogues using quinolinium fluorochromate
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The synthetic utility of quinolinium fluorochromate (QFC) in deprotection of thiocarbonyl compounds is reported. A variety of primary and secondary thioamides and thioureas are converted to their oxo derivatives in high yields. However, tertiary thioamides afford their amides in relatively poor yields. Selective deprotection of thioamides and thioureas in the presence of thionoesters and thioketones is noteworthy advantage of this method.
- Tajbakhsh,Mohammadpoor-Baltork,Alimohammadi
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p. 2638 - 2640
(2007/10/03)
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- Bismuth(III) nitrate pentahydrate: A convenient and selective reagent for conversion of thiocarbonyls to their carbonyl compounds
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A variety of thioamides and thioureas are rapidly transformed to their oxo derivatives with Bi(NO3)3·5H2O in excellent yields. However, thiono esters and thioketones are converted to their corresponding carbonyl compounds in only poor yields. Bi(NO3)3·5H2O is relatively non-toxic, insensitive to air and inexpensive. These features coupled with the selective deprotection of thioamides and thioureas in the presence of thiono esters and thioketones make this method an attractive alternative to the existing routes for deprotection of thiocarbonyl compounds.
- Mohammadpoor-Baltork, Iraj,Khodaei, Mohammad Mehdi,Nikoofar, Kobra
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p. 591 - 594
(2007/10/03)
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- A facile and convenient method for deprotection of thiocarbonyls to their carbonyl compounds using oxone under aprotic and nonaqueous conditions
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The reaction of oxone as an inexpensive, stable, and commercially available reagent with thiocarbonyl compounds in refluxing acetonitrile has been studied. Primary, secondary, and tertiary thioamides and thioureas are converted to their oxo analogues efficiently. Thiono esters also are transformed to their corresponding esters, while thioketones remained intact under these conditions.
- Mohammadpoor-Baltork,Sadeghi,Esmayilpour
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- Selective and efficient oxidation of diaryl carbazide to diaryl carbazone with NaNO2/NaHSO4·H2O/SiO2
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Ten diaryl carbazide are shown to undergo selective and rapid oxidation to the diaryl carbazones using NaNO2/NaHSO4·H2O/SiO2 as a novel mild oxidising agent.
- Li, Xiao-Chuan,Wang, Yu-Lu,Wang, Jin-Ye
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p. 234 - 235
(2007/10/03)
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- Selective and efficient oxidation of diaryl carbazide to diaryl carbazone with NaNO2-acetic anhydride under mild conditions
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In this paper, ten diaryl carbazide undergo selective and rapid oxidation to the corresponding diaryl carbazone using NaNO2-acetic anhydride as a novel oxidant under mild conditions for the first time.
- Li, Xiao-Chuan,Wang, Yu-Lu,Wang, Jin-Ye
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p. 3285 - 3288
(2007/10/03)
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