Load of Ag3PO4 Particles on Sulfonated Polyphenylene Sulfide Superfine Fibre with High Visible-light Photocatalytic Activity

Pei Wang,Chenchen He,Lingquan Hu,Shaohua Chen,Xianze Yin,Jing Xu,Luoxin Wang,Hua Wang 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7

Ag3PO4 was loaded on sulfonated polyphenylene sulfide (SPPS) superfine fibre by a facile precipitation method. Both the structure and properties of the as-synthesized Ag3PO4/SPPS composites were characterized via XRD, SEM, EDS, XPS, FTIR, and UV-vis. The photocatalytic performance of Ag3PO4/SPPS composites was investigated via degradation of Methylene blue(MB) solution under visible light irradiation. The degradation results revealed that the photocatalytic activity of Ag3PO4/SPPS composites was greatly enhanced by the incorporation of Ag3PO4 with SPPS superfine fibre. For concentrations of AgNO3 and Na2HPO4 solutions of 0.3 M and 0.06 M in the preparation process, the Ag3PO4/SPPS composite showed higher photocatalytic activity under visible light irradiation.

Transformations of phenol into fuel over TiO2–CeO2/ZSM-5 aided by ultrasound and ultraviolet

Lei Wang,Fang yuan,Luoxin Liu,Nchare Mominou,Shuzhen Li,Cheng Li,Wenjiu Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1

A novel technology, named transformations of phenol into fuel over TiO2–CeO2/ZSM-5 aided byultrasound and ultraviolet (TPFU), was developed. ZSM-5 zeolite was adjusted by TiO2 and CeO2 bymeans of impregnation. X-ray diffraction (XRD) and scanning electron microscope (SEM) analysisindicated the ZSM-5 remained intact after modification, and the titanium and cerium partly entered thecatalyst channel. The effect of temperature, pressure, space speed, and phenol to the catalyst ratio on theproduction yield was studied. The model compounds were transformed into fuel on the conditions oftemperature 300 8C; pressure 0.11 MPa, space velocity 1.0 h 1, and the ratio 1.5. Gasoline and diesel oilyield, and phenol compound conversion rate reached the maximum values of 50.1%, 44.1% and 98.5%,respectively. Meanwhile, biomass oil was transformed into fuel under the best conditions. The content ofaromatic compounds and alkane compounds in refined oil was higher than that in biomass crude oil, andphenol content has a significant decrease.

Density Functional Theory Study on Triphenylamine-based Dye Sensitizers Containing Different Donor Moieties

Xu, Jie,Wang, Lei,Liang, Guijie,Bai, Zikui,Wang, Luoxin,Xu, Weilin,Shen, Xiaolin Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.9

Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been employed to investigate the molecular structures and absorption spectra of two dyes containing diphenylaniline and 4-diphenylamino-diphenylaniline as donor moiety (TPA1 and TPA3). The geometries indicate that the strong conjugation is formed in the dyes. The electronic structures suggest that the intramolecular charge transfer from the donor to the acceptor occurs, and the electron-donating capability of 4-diphenylamino-diphenylaniline is stronger than that of diphenylaniline. The computed highest occupied molecular orbital (HOMO) energy levels are -5.31 and -4.90 eV, while the lowest unoccupied molecular orbital (LUMO) energies are -2.29 and -2.26 eV for TPA1 and TPA3, respectively, revealing that the interfacial charge transfer between the dyes and the semiconductor electrode are electron injection processes from the photon-excited dyes to the semiconductor conduction band. Furthermore, all the experimental absorption bands of TPA1 and TPA3 have been assigned according to the TDDFT calculations.

QSPR Study of the Absorption Maxima of Azobenzene Dyes

Xu, Jie,Wang, Lei,Liu, Li,Bai, Zikui,Wang, Luoxin Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.11

A quantitative structure-property relationship (QSPR) study was performed for the prediction of the absorption maxima of azobenzene dyes. The entire set of 191 azobenzenes was divided into a training set of 150 azobenzenes and a test set of 41 azobenzenes according to Kennard and Stones algorithm. A seven-descriptor model, with squared correlation coefficient ($R^2$) of 0.8755 and standard error of estimation (s) of 14.476, was developed by applying stepwise multiple linear regression (MLR) analysis on the training set. The reliability of the proposed model was further illustrated using various evaluation techniques: leave-many-out crossvalidation procedure, randomization tests, and validation through the test set.

QSPR Study of the Absorption Maxima of Azobenzene Dyes

Jie Xu,Lei Wang,Li Liu,Zikui Bai,Luoxin Wang 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.11

A quantitative structure-property relationship (QSPR) study was performed for the prediction of the absorption maxima of azobenzene dyes. The entire set of 191 azobenzenes was divided into a training set of 150azobenzenes and a test set of 41 azobenzenes according to Kennard and Stones algorithm. A seven-descriptor model, with squared correlation coefficient (R2) of 0.8755 and standard error of estimation (s) of 14.476, was developed by applying stepwise multiple linear regression (MLR) analysis on the training set. The reliability of the proposed model was further illustrated using various evaluation techniques: leave-many-out crossvalidation procedure, randomization tests, and validation through the test set.

Density Functional Theory Study on Triphenylamine-based Dye Sensitizers Containing Different Donor Moieties

Jie Xu,Lei Wang,Guijie Liang,Zikui Bai,Luoxin Wang,Weilin Xu,Xiaolin Shen 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.9

Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been employed to investigate the molecular structures and absorption spectra of two dyes containing diphenylaniline and 4-diphenylamino-diphenylaniline as donor moiety (TPA1 and TPA3). The geometries indicate that the strong conjugation is formed in the dyes. The electronic structures suggest that the intramolecular charge transfer from the donor to the acceptor occurs, and the electron-donating capability of 4-diphenylamino-diphenylaniline is stronger than that of diphenylaniline. The computed highest occupied molecular orbital (HOMO) energy levels are ‒5.31 and ‒4.90 eV, while the lowest unoccupied molecular orbital (LUMO) energies are ‒2.29 and ‒2.26 eV for TPA1 and TPA3, respectively, revealing that the interfacial charge transfer between the dyes and the semiconductor electrode are electron injection processes from the photonexcited dyes to the semiconductor conduction band. Furthermore, all the experimental absorption bands of TPA1 and TPA3 have been assigned according to the TDDFT calculations.

A Novel High Performance SOI LDMOS with Buried Stepped Gate Field Plate

Hongchao Hu,Hongli Dai,Luoxin Wang,Haitao Lyu,Yuming Xue,Tu Qian 한국전기전자재료학회 2023 Transactions on Electrical and Electronic Material Vol.24 No.6

With the continuous development of science and technology, the power semiconductor devices are becoming more and more extensive. A novel silicon-on-insulator (SOI) lateral double-diffused metal–oxide–semiconductor (LDMOS) has been proposed in this paper. The new device is mainly characterized by introducing a stepped gate field plate in the low-K dielectric buried layer (SGFP-LK). On the one hand, the stepped gate field plate introduces extra lateral electric field peaks, which makes the distribution of potential lines more uniform and improves the breakdown voltage (BV). Moreover, the stepped gate fi eld plate decreases the specific on-resistance ( R on,sp ) by a promoted depletion. On the other hand, different from the traditional buried oxygen layer, the low-K dielectric layer strengthens the vertical electric field and signifi cantly increases BV. Ultimately, compared with the conventional device (C-SOI LDMOS), the BV of the SGFP-LK LDMOS is dramatically enhanced by 107% and the R on,sp is reduced by 24.8%. Furthermore, the figure of merit is enhanced by 472%. In addition, the maximum lattice temperature of the SGFP-LK LDMOS is dropped by 23.1 K, which relieves self-heating effects to some extent.

Influence of para-orientating Methoxyl Units on the Electronic Structures and Light Absorption Properties of the Triphenylamine-based dyes by DFT Study

Guijie Liang,Jie Xu,Weilin Xu,Luoxin Wang,Xiaolin Shen,Mu Yao 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7

The geometries, electronic structures and absorption spectra of the two organic triphenylamine-based dyes TASt-CA and TA-DM-CA, containing identical electron donors and acceptors but the different conjugated bridges, were studied by density functional theory (DFT) at the B3LYP and PBE1PBE levels, respectively. The influence of para-orientating methoxyl units on the electronic structures and light absorption properties of the dyes and the consequent photovoltaic performance of the dye-sensitized solar cells (DSSCs) were investigated in detail. The results indicate that the introduction of the para-orientating methoxyl units into the conjugated bridge induces the increased absorption wavelength as well as the more negative EHOMO corresponding to the bigger driving force (E_I^-/_(I3)^-)− EHOMO) for dye reduction, which together improve the photovoltaic performance of TA-DM-CA, although there is a decline of the open circuit voltage caused by the more negative E_(LUMO).

Influence of para-orientating Methoxyl Units on the Electronic Structures and Light Absorption Properties of the Triphenylamine-based dyes by DFT Study

Liang, Guijie,Xu, Jie,Xu, Weilin,Wang, Luoxin,Shen, Xiaolin,Yao, Mu Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.7

The geometries, electronic structures and absorption spectra of the two organic triphenylamine-based dyes TA-St-CA and TA-DM-CA, containing identical electron donors and acceptors but the different conjugated bridges, were studied by density functional theory (DFT) at the B3LYP and PBE1PBE levels, respectively. The influence of para-orientating methoxyl units on the electronic structures and light absorption properties of the dyes and the consequent photovoltaic performance of the dye-sensitized solar cells (DSSCs) were investigated in detail. The results indicate that the introduction of the para-orientating methoxyl units into the conjugated bridge induces the increased absorption wavelength as well as the more negative EHOMO corresponding to the bigger driving force $(E_{I^-/I^-_3}-E_{HOMO})$ for dye reduction, which together improve the photovoltaic performance of TA-DM-CA, although there is a decline of the open circuit voltage caused by the more negative $E_{LUMO}$.