JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 50
·期 4
·1594-1604
·
IF 2.305
Zhu Yingming,Xu Dandan,Meng Ming
A series of Bi 2 S 3 /(BiO) 2 CO 3 composite photocatalysts with different loadings of amorphous Bi 2 S 3 were successfully synthesized through an ultrasonic-assisted ion-exchange reaction between thioacetamide (CH 3 CSNH 2 ) and (BiO) 2 CO 3 , and characterized by XRD, XPS, BET, EELS, EDX, SEM, TEM/HRTEM, UV–Vis, and photoluminescence (PL) techniques. The results of TEM/HRTEM, EELS, and EDX indicate that the composite catalyst Bi 2 S 3 /(BiO) 2 CO 3 has been successfully synthesized with the deposited Bi 2 S 3 present in amorphous state on the surface of (BiO) 2 CO 3 . The activities of the catalysts for RhB degradation under visible light show that the catalyst prepared under ultrasonic is more active than the one synthesized without ultrasonic. The optimized sample Bi 2 S 3 /(BiO) 2 CO 3 (U5.0) exhibits a much higher activity, about 4.8 times to that of pure (BiO) 2 CO 3 . Based upon the band structures of Bi 2 S 3 /(BiO) 2 CO 3 , it is deduced that the migration of the visible light-induced electrons from the conduction band of Bi 2 S 3 to that of (BiO) 2 CO 3 should have facilitated the separation of photogenerated carriers, as confirmed by the suppressed photoluminescence spectra. Using different scavengers, the ·O 2
− and holes are clearly identified as the main oxidative species for RhB photodegradation. In light of these observations, a potential photocatalytic mechanism of RhB degradation over Bi 2 S 3 /(BiO) 2 CO 3 is proposed.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Weicheng Xu,Jianzhang Fang,Ximiao Zhu,Zhanqiang Fang,Chaoping Cen
A series of novel p−n junction photocatalysts BiOI/Bi 2 Sn 2 O 7 (BiOI/BSO) were successfully fabricated via a facile hydrothermal method. The phase structures, morphologies and optical properties of the as-prepared samples were studied by XRD, TEM, HRTEM, BET, XPS, UV–vis DRS and photoluminescence (PL) spectroscopy. The results showed that BiOI/BSO heteronanostructures displayed much higher photocatalytic activity than pure BSO and BiOI for the degradation of rhodamine B (RhB). The best photocatalytic activity of BiOI/BSO with almost 99.9% RhB degradation situated at molar percentage ratio of 4% after 6 h irradiation. The enhanced photocatalytic performance of BiOI/BSO could be mainly attributed to the formation of the heterojunction between p-BiOI and n-BSO, which effectively restrains the recombination of photoinduced electron–hole pairs. Moreover, the study of radical scavengers affirmed that h + and •O 2 − were the primary reactive species for the degradation of RhB.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 20
·11851-11860
·
IF 3.119
Rongjing Wang,Yaru Li,Qianyi Sun,Kaihua Gao,Yufu Pan,Meng Li,Feitian Zhang,Ping Na
In this paper, a new photocatalyst with TiO2 nanospheres decorated on ultrathin layered thiostannate H4xK2xSn2−xS4+x (X = 0.5–0.6, HKTS) nanosheets was successfully synthesized by a facile solvothermal method combined with the hydrolysis of tetrabutyl titanate and it was denoted as HKTS/TiO2. By adjusting the content of tetrabutyl titanate, composites with different Sn/Ti molar ratios were prepared. The composites were applied for RhB degradation under visible light irradiation, and the optimum proportion of HKTS/TiO2 was obtained. The results of X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy confirmed that TiO2 was successfully decorated on HKTS nanosheets. The combination of TiO2 and HKTS extended the absorption wavelength of TiO2 from UV to visible light range, and the separation efficiency of photoexcited electron–hole pairs was also enhanced. The photocatalytic degradation rate of RhB over HKTS/TiO2-1.0 was almost 97.9% after 60 min illumination, which was higher than those of HKTS and pure TiO2. The photocatalyst exhibited excellent reusability and stability as the degradation rate of RhB was 95.7% even after three cycles. The photocatalytic mechanism experiment indicated that ·O2− and h+ played a dominant role in the photocatalytic process. All these results indicate that the newly fabricated HKTS/TiO2 composites provide a high-performance photocatalyst for waste water treatment, and the application of thiostannate can be extended to the field of photocatalytic materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Yi Qi,Quan Zuo,Yuqing Mei,Tongjie Yao,Jie Wu
Environmental pollution caused by persistent organics has drawn intensive attention. Microwave-assisted Fenton reaction (MAFR) was a rapid and effective technique for their removal. Herein, a sponge-templated method was introduced for the scalable preparation of two-dimensional (2D) porous NiCo2O4 sheet. Its surface area was 4.0 times higher than that of NiCo2O4 aggregate prepared without a sponge template. Control experiments revealed that the hydrophilic surface and restricted growth effect of sponge were essential for shaping sheetlike morphology. According to the response surface methodology, the optimal condition in MAFR was 10 mg of catalyst, 10 mg of peroxymonosulfate, 300 W of microwave power, and 70 °C of temperature, under which 50 mg/L of rhodamine B (RhB) was degraded within 1.5 min. The degradation rate constant was as high as 0.45 min–1, which was about 2.0 times higher than the reaction catalyzed by NiCo2O4 aggregate. SO4•– was identified as the main active species, as 62.2% of RhB removal was inhibited in their absence. The 2D porous NiCo2O4 sheet also exhibited good reusability and stability, Co3+ leaching in NiCo2O4 was only 1/14 that in Co3O4, and 81.7% of degradation efficiency was maintained even after five successive cycles.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Weibing Li,Lin Wang,Qiang Zhang,Zhuoyuan Chen,Xiaoyan Deng,Chang Feng,Likun Xu,Mingxian Sun
An ultrathin 2D/2D C 3 N 4 /MoS 2 (U-CN/MoS 2 ) heterojunction photocatalyst was prepared by a simple mechanical grinding technique to investigate the photocatalytic degradation RhB and hydrogen production performance. Physical characterization shows that the ultrathin MoS 2 nanosheets (U-MoS 2 ) can form heterojunction with the ultrathin C 3 N 4 (U-CN), and their intrinsic crystal structure remains stable. Further photocatalytic performance test demonstrated that the U-CN/MoS 2 heterojunction photocatalyst significantly enhanced the photocatalytic activity of U-CN. The U-CN/MoS 2 photocatalyst with 3% mass fraction of MoS 2 station (U-CN/MoS 2 -3) has the optimal photocatalytic performance. Due to MoS 2 has a suitable band structure and can replace noble metal as a co-catalyst, the U-CN/MoS 2 -3 could achieve the hydrogen production efficiency of 385.04 μmol∙h −1 ∙g −1 , which makes MoS 2 show potential in photocatalytic hydrogen production. The enhanced photocatalytic performance was attributed to the significantly enhanced concentration of photogenerated carriers, the effective separation of photogenerated carriers, and suppressed recombination of photogenerated electrons and holes in the photocatalytic reaction.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2014
·Vol. 4
·期 4
·1028-1037
·
IF 4.76
Haiping Li,Quanhua Deng,Jingyi Liu,Wanguo Hou,Na Du,Renjie Zhang,Xutang Tao
Bi2MoO6/Zn–Al layered double hydroxide (LDH) hierarchical heterostructures assembled from Bi2MoO6 hierarchical hollow spheres and Zn–Al LDH nanosheets were synthesized by a low-temperature hydrothermal method. X-ray diffraction, Fourier transform-infrared spectroscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy (XPS) confirmed the formation of the Bi2MoO6/Zn–Al LDH composites. Morphologies were characterized by scanning electron microscopy and transmission electron microscopy (TEM). XPS and high resolution TEM indicated the formation of a Bi2MoO6/Zn–Al LDH heterojunction. Increasing the LDH content from 0 to 27.0 wt.% caused the Brunauer–Emmett–Teller (BET) specific surface area of the composites to gradually increase. The photocatalytic degradation activity for Rhodamine B (RhB) under visible light irradiation exhibited a large enhancement, followed by a decrease, with increasing LDH content. The Bi2MoO6/Zn–Al LDH heterostructure composite with LDH content of 5.5 wt.% showed the highest photocatalytic activity and degraded 99% of RhB in 80 min, while Bi2MoO6 degraded less than 50%. The average photocatalytic efficiency is enhanced by more than 100%. The enhanced photocatalytic activity of the Bi2MoO6/Zn–Al LDH heterostructure photocatalyst was mainly attributed to the efficient separation of photoinduced electrons and holes. Superoxide radicals and holes were the major active species. The Bi2MoO6/Zn–Al LDH heterostructure photocatalyst exhibited excellent stability and reusability. A detailed mechanism for its enhanced photocatalytic activity was discussed in this study. This work provides an effective way to fabricate a series of Bi-based and LDH-containing heterostructure photocatalysts.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2023
·
IF 7.3
Minhua Ai,Lun Pan,Ying Chen,Chengxiang Shi,Zhen-Feng Huang,Xiangwen Zhang,Ji-Jun Zou
The periodical distribution of N and C atoms in the carbon nitride skeleton results in intrinsically insufficient light absorption and serious carrier recombination. Herein, an efficient two-step cystine-mediated strategy was developed to alter the structure symmetry of C 3 N 4 via the introduction of alkyl groups and nitrogen vacancies. The experimental analysis and theoretical calculation confirm that the formation of alkyl groups and nitrogen vacancies can modulate band structure and activate n-π* electron transition. Especially, the charge density in CN-25CYS is redistributed with spatial separation of oxidation and reduction sites, suppressing photogenerated charge recombination effectively. Therefore, the distorted carbon nitride (CN-25CYS) exhibits 9.6-times and 15.6-times higher photoreaction rates in hydrogen production and RhB degradation than the pristine one (CN-0CYS), respectively.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 10
·4265-4278
·
IF 3.442
Hu Miao,Yan Aihua,Cui Qiaopeng,Huang Fei,Li Dengke,Li Fan,Huang Ji,Qiang Yinghuai
In this work, nickel sulfide (NiS)/bismuth oxybromide (BiOBr) hybrids were synthesized by a two-step hydrothermal method. Some advanced tools were employed to characterize the crystal phase, morphological evolution, light absorption and photocatalytic performance. Significantly, NiS/BiOBr hybrids exhibited enhanced photocatalytic activity toward rhodamine B (RhB) degradation under visible light irradiation. Comparatively, NS/BOB-3.0 showed the highest degradation rate, over 2.5 times higher than that of pure BiOBr. Furthermore, the retarded recombination rate of photogenerated carriers contributed to the improved photocatalytic performance. The results indicate that hybrids may be a promising method for enhancing the photocatalytic ability of BiOX-based semiconductor.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Na Liu,Yanwei Su,Siyi Zheng,Yuchen Tang,Chunxia Yu,Yuangang Li,Lihua Shen
Sulfur nanosheets (S-NSs), as a novel photocatalyst, was designed to composite with graphite phase nitrogen carbide (g-C 3 N 4 ) to form a kind of new S-NSs/g-C 3 N 4 (CNS) photocatalyst. The modulating effect of bovine serum albumin (BSA) or poly (3,4-ethylenedioxythiao)-polystyrene sulfonic acid (PEDOT:PSS) ligands on the photocatalytic activity of CNS nanocomposite was studied. The ligands mainly affect the band gap and conduction band potential of the photocatalyst, leading to different photocatalytic activities. When BSA was used as a ligand, the combine of S-NSs and g-C 3 N 4 (CNS-B) cannot improve the photocatalytic activity for the degradation of Rhodamine B (RhB). When PEDOT:PSS was used as a ligand, the composite catalysts of CNS-P significantly improved the photocatalytic activity. The degradation efficiency of composite material CNS-P for RhB and Doxycycline hydrochloride (DOX) can reach 97 % (90 min) and 78 % (90 min). Since the combine of S-NSs and g-C 3 N 4 , the photoelectric conversion ability was enhanced and the carrier mobility was accelerated. The composite catalyst enhanced the redox ability and suppressed the recombination of photo generated carriers through Z-type charge transfer. This study give a reference for designing a new photocatalysts of two dimensional materials and also provide a potential feasibility for antibiotic degradation application.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2014
·
IF 5.323
Jingu Shi,Zhihui Ai,Lizhi Zhang
In this study we demonstrate Fe@Fe 2 O 3 core–shell nanowires can improve Fenton oxidation efficiency by two times with rhodamine B as a model pollutant at pH > 4. Active species trapping experiments revealed that the rhodamine B oxidation enhancement was attributed to molecular oxygen activation induced by Fe@Fe 2 O 3 core–shell nanowires. The molecular oxygen activation process could generate superoxide radicals to assist iron core for the reduction of ferric ions to accelerate the Fe(III)/Fe(II) cycles, which favored the H 2 O 2 decomposition to produce more hydroxyl radicals for the rhodamine B oxidation. The combination of Fe@Fe 2 O 3 core–shell nanowires and ferrous ions (Fe@Fe 2 O 3 /Fe 2+ ) offered a superior Fenton catalyst to decompose H 2 O 2 for producing OH. We employed benzoic acid as a probe reagent to check the generation of OH and found the OH generation rate of Fe@Fe 2 O 3 /Fe 2+ was 2–4 orders of magnitude larger than those of commonly used iron based Fenton catalysts and 38 times that of Fe 2+ . The reusability and the stability of Fe@Fe 2 O 3 core–shell nanowires were studied. Total organic carbon and ion chromatography analyses revealed the mineralization of rhodamine B and the releasing of nitrate ions. Gas chromatograph-mass spectrometry was used to investigate the degradation intermediates to propose the possible rhodamine B Fenton oxidation pathway in the presence of Fe@Fe 2 O 3 nanowires. This study not only provides a new Fenton oxidation system for pollutant control, but also widen the application of molecular oxygen activation induced by nanoscale zero valent iron .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 10
·5441-5450
·
IF 2.936
Yongmei Xia,Zuming He,Yalin Lu,Bin Tang,Shunping Sun,Jiangbin Su,Xiaoping Li
Novel multifunctional SrTiO3/NiFe2O4 nanocomposites were successfully fabricated via a two-step route. The as-prepared samples were characterized by using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), field-emission transmission electron microscopy (TEM), UV-visible diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy and vibrating sample magnetometry (VSM). The results indicate that the SrTiO3/NiFe2O4 heterostructures are composed of SrTiO3 spheroidal nanoparticles adhered to NiFe2O4 polyhedra. The heterojunction established in the composite material accelerates the process of electron–hole pair separation and boosts the photo-Fenton reaction. Among the samples, 15 wt% SrTiO3/NiFe2O4 nanocomposites exhibit a powerful light response and excellent room temperature ferromagnetism. Subsequently, the photocatalytic degradation of RhB over the as-prepared samples was investigated and optimized, revealing that the 15 wt% SrTiO3/NiFe2O4 nanocomposites exhibit the best photocatalytic activity and stability under simulated solar light irradiation. Furthermore, according to experimental results, the possible mechanism of improved photocatalytic activity was also proposed.
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 21
·19137-19146
·
IF 2.195
Xiang Ye,Zou Hao,Xu Yifeng,Deng Yuehong,Zhu Jie,Wu Wan,Zhou Yi
In this article, the novel direct Z-scheme ZnIn 2 S 4 @BiOBr-(110) heterojunction structure was firstly synthesized via simple two-step hydrothermal method. The results of XRD and HRTEM indicated that as-prepared BiOBr mainly exposed high energy (110) facet. Simultaneously, the photoelectrochemical measurement was performed to further investigate the photo-induced carrier separation efficiency. The results indicated that Z-scheme heterojunction structure formed by the loading of ZnIn 2 S 4 nanosheets not only promoted the separation of photogenerated carriers and inhibited fast recombination rate of photogenerated electron–hole pairs of pure BiOBr, but also endowed the composite with better redox activity. The degradation efficiency of RhB by BiOBr loaded with 10 mol% ZnIn 2 S 4 has achieved 98% within 18 min under the irradiation of Xe lamp, which demonstrated that the unique direct Z-scheme ZnIn 2 S 4 @BiOBr-(110) composite photocatalytic materials has the potential application in environmental pollution control and energy conversion.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）