MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Yongkun Wang,Kaibin Tang,Baichuan Zhu,Dake Wang,Qiaoyan Hao,Yan Wang
A new Ruddlesden–Popper type scandium oxyfluoride, Sr 2 ScO 3 F, was synthesized by a conventional solid state reaction route. The detailed structure of Sr 2 ScO 3 F was investigated using X-ray diffraction (XRD) and selected area electron diffraction (SAED). The disorder distribution pattern of fluorine anions was determined by the 19 F nuclear magnetic resonance (NMR) spectrum. The compound crystallizes in a K 2 NiF 4 -type tetragonal structure (space group I 4 /mmm ) with O/F anions disordered over the apical sites of the perovskite-type Sc(O,F) 6 octahedron layers interleaved with strontium cations. Ultraviolet–visible (UV–vis) diffuse reflection spectrum of the prepared Sr 2 ScO 3 F indicates that it has an absorption in the UV–vis region. The photocatalytic activity of Sr 2 ScO 3 F was further investigated, showing an effective photodegradation of Rhodamine-B (RB) within 2 h under UV light irradiation.
研究领域:
材料科学
·
无机化学
·
光催化
·
固体化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Shoufeng Tang,Na Li,Deling Yuan,Jiachen Tang,Xue Li,Chen Zhang,Yandi Rao
Introducing peroxymonosulfate (PMS) and peroxydisulfate (PDS) into the photocatalytic fuel cell (PFC) system were investigated by comparing the Reactive Brilliant Blue (KN-R) degradation and synchronous electricity production. The two persulfates (PS) themselves are strong oxidant , and could be activated and as electron sacrificial agent in the PFCs, facilitating the photoelectrocatalysis and expanding redox to the entire cell space. Hence, the two established PFC/PS systems manifested prominent cell performances, enhancing the KN-R decomposition and electric power production relative to the virgin PFC. Thereinto, the KN-R removal rate of PFC/PMS was faster than that of PFC/PDS, but an opposite trend appeared in the electricity generation. Besides, the cell performances of the two cooperative systems were evaluated at different operation conditions, including PS dosage, solution pH, and irradiation strength . Moreover, the dye elimination principle was explored by radicals scavenging experiment, and the consequence revealed that hydroxyl radical (HO • ), sulfate radical (SO 4 • ˉ) and singlet oxygen were chief active species in the PFC/PMS, and HO • , SO 4 • ˉ and superoxide anion played the key roles in the PFC/PDS. Furthermore, the calculated economic indicator demonstrated that the economy of the two synergistic processes were greater than that of UV/PS and solo PFC, and the PFC/PDS was more cost-effective than PFC/PMS.
研究领域:
环境科学
·
化学工程
·
高级氧化技术
·
能源材料
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光催化
·
废水处理
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Hengyu Xu,Chen Qian,Xiaojie Tan,Wei Xia,Yulong Wu
This paper investigates the fabrication of Co-doped carbon nitride (C 3 N 4 -Co) and its application in degrade 4-chloro-guaiacol. Co-doped carbon nitride significantly enhanced the photocatalytic activity for 4-chloro-guaiacol degradation compared to unmodified carbon nitride. Under the same conditions, the degradation rate of 4-chloro-guaiacol by unmodified C 3 N 4 was only 30.7 %, however it increased to 73.7 % by Co-doped carbon nitride (0.25 wt%). Co-doping can extend the wavelength range, improve oxygen adsorption, and reduce electron-hole recombination. However, the greater the amount of Co-doping. But, when the doping level is too high, excessive oxygen adsorption may occur on the surface of the active site, obstructing 4-chloro-guaiacol adsorption and reducing the catalytic efficiency. This work could provide useful information regarding AOX degradation for future research.
研究领域:
环境化学
·
材料科学
·
光催化
·
水处理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Qianwei Ding,Yue-E Miao,Tianxi Liu
A simple and efficient method has been developed for preparing hierarchical nanostructures of polyimide (PI)/ZnO fibers by combining electrospinning and direct ion-exchange process. Poly(amic acid) (PAA) nanofibers are first prepared by electrospinning, and then, the electrospun PAA fibers are immersed into ZnCl2 solution. After a subsequent thermal treatment, imidization of PAA and formation of ZnO nanoparticles can be simultaneously achieved in one step to obtain PI/ZnO composite fibers. SEM images show that ZnO nanoparticles are densely and uniformly immobilized on the surface of electrospun PI fibers. Furthermore, the morphology of ZnO can be tuned from nanoplatelets to nanorods by changing the initial concentration of ZnCl2 solution. Photocatalytic degradation tests show an efficient degradation ability of PI/ZnO composite membranes toward organic dyes. Meanwhile, the free-standing membrane is highly flexible, easy to handle, and easy to retrieve, which enables its use in water treatment. This simple and inexpensive approach can also be applied to fabricating other hierarchically nanostructured composites.
研究领域:
材料科学
·
纳米技术
·
环境工程
·
高分子科学
·
光催化
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2016
·
IF 2.435
Yongji Xin,Yan Lu,Changcun Han,Lei Ge,Ping Qiu,Yujing Li,Siman Fang
In this paper, ultrathin 2D TiO 2 nanosheets which modified with ultrafine dispersions of NiS cocatalyst were successfully prepared via a low-cost and in-situ synthesis approach. The physical and chemical properties of the as-obtained NiS/TiO 2 nanosheets samples were investigated by a variety of analytical techniques. Cooperated with the photocatalytic hydrogen evolution tests and surface photovoltage spectroscopy (SPV) experiments, it can be deduced that the NiS is an efficient cocatalyst, which significantly limited the recombination of photogenerated electron-hole pairs in ultrathin 2D TiO 2 nanosheets and consequently improve the hydrogen evolution activity. The influence of different molar ratios of NiS on the photocatalytic activity was explored and the 5 mol% NiS/TiO 2 composite photocatalyst showed the highest photoactivity which the corresponding H 2 -production rate was 313.6 μmol h −1 g −1 under the UV–vis light irradiation. The optimal H 2 evolution rate is 36 times as much as the value of pure TiO 2 nanosheets. The photocatalytic mechanism of NiS cocatalysts on the enhanced performance of the photocatalytic activity of TiO 2 nanosheets is proposed and confirmed by SPV results.
研究领域:
材料科学
·
光催化
·
纳米材料
·
氢能
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Guiming Ba,Tingting Huo,Quanhua Deng,Haiping Li,Wanguo Hou
Creation of defects and mesopores in polymeric carbon nitride (CN), a promising photocatalyst for practical applications, is highly effective in enhancing the photocatalytic performance; however, environmentally friendly physical methods (e.g., mechanical ball-milling) and effective means for the simultaneous formation of defects and mesopores in CN to synergistically enhance the photoactivity are still scarce. Herein, a mechanochemical method was successfully used to synthesize mesopore-rich CN with nitrogen vacancies (mCNv) by mechanical ball-milling of the intermediate (melem) with succedent calcination. The simultaneous formation of nitrogen vacancies and mesopores in mCNv arises from the ball-milling-induced structure distortion and morphological variation of the intermediate with massive rupture of intermolecular hydrogen bonds. The as-prepared mCNv exhibits enlarged specific surface area, considerably thinned nanosheets, extended visible light absorption, enhanced photoexcited charge separation and transfer, and thus ∼6.3-fold improved photocatalytic H2 evolution activity under visible light irradiation, compared with the bulk CN. This work provides a novel, universal, and industrializable technique for simultaneous creation of defects and mesopores in CN.
研究领域:
材料科学
·
光催化
·
纳米材料
·
可持续能源
·
物理化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2014
·
IF 5.9
Jie Zhang,Ping Wang,Jian Sun,Yongdong Jin
Solar-driven photocatalytic process based on electron–hole pair production in semiconductors is a long sought-after solution to a green and renewable energy and has attracted a renaissance of interest recently. The relatively low photocatalytic efficiency, however, is a main obstacle to their practical applications. A promising attempt to solve this problem is by combined use of metal nanoparticles, by taking advantage of strong and localized plasmonic near-field to enhance solar absorption and to increase the electron–hole pair generation rate at the surface of semiconductor. Here, we report a semiconductor/metal visible-light photocatalyst based on CdSe/CdS-Au (QD-Au) core–satellite heteronanocrystals, and assemble them on graphene nanosheets for better photocatalytic reaction. The as-synthesized photocatalyst exhibits excellent plasmon-enhanced photocatalytic activities toward both photodegradation of organic dye and visible-light H2 generation from water. The H2 evolution rate achieves a maximum of 3113 μmol h–1 g–1 for the heteronanocrystal-graphene composites, which is about 155% enhancement compared to nonplasmonic QD-G sample and 340% enhancement compared to control QD-Au-G sample, and the apparent quantum efficiency (QE) reaches to 25.4% at wavelength of 450 nm.
研究领域:
材料科学
·
纳米技术
·
光催化
·
可再生能源
·
半导体物理
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2013
·
IF 5.008
Jiye Zhang,Yonghao Wang,Jian Jin,Jun Zhang,Zhang Lin,Feng Huang,Jiaguo Yu
CdS/g-C3N4 core/shell nanowires with different g-C3N4 contents were fabricated by a combined solvothermal and chemisorption method and characterized by X-ray powder diffraction, scanning electronic microscopy, transmission electron microscopy, and UV–vis diffuse reflection spectroscopy. The photocatalytic hydrogen-production activities of these samples were evaluated using Na2S and Na2SO3 as sacrificial reagents in water under visible-light illumination (λ ≥ 420 nm). The results show that after a spontaneous adsorption process g-C3N4 is successfully coated on CdS nanowires with intimate contact and can significantly improve the photocatalytic hydrogen-production rate of CdS nanowires, which reaches an optimal value of up to 4152 μmol h–1 g–1 at the g-C3N4 content of 2 wt %. More importantly, g-C3N4 coating can substantially reinforce the photostability of CdS nanowires even in a nonsacrificial system. The synergic effect between g-C3N4 and CdS, which can effectively accelerate the charge separation and transfer corrosive holes from CdS to robust C3N4, was proposed to be responsible for the enhancement of the photocatalytic activity and photostability. The possible conditions necessary for the synergic effect to work in a CdS/g-C3N4 core/shell configuration is also discussed.
研究领域:
材料科学
·
光催化
·
可再生能源
·
纳米技术
·
氢气制备
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chao Yang,Na Han,Wenxin Zhang,Weijing Wang,Wei Li,Bolun Xia,Changye Han,Zhenyu Cui,Xingxiang Zhang
Nanosized titanium dioxide (TiO 2 )-based materials are regarded as an effective approach for disposing organic pollutants. However, their wide bandgap, rapid electron/hole recombination, poor chemisorption , and aggregation limit their photoactivity and photocatalytic efficiency. In this study, the coupling of TiO 2 and a conjugated polymer membrane is created to improve the photoactivity and photocatalytic efficiency of TiO 2 . Nanosized TiO 2 with high crystallinity is synthesized on the surface of the pretreated poly(phenylene sulfide) (PPS) porous membrane through the in situ hydrothermal process. Strong interaction forms between the prepared TiO 2 and the membrane matrix, which leads to the efficient migration and transfer of electron-hole pairs. As a result, the band gap and the electron/hole recombination rate of TiO 2 significantly decrease. The TiO 2 @PPS membrane possesses better adsorption capacity compared with the photocatalyst consisting of individual TiO 2 , which will greatly increase the photocatalytic efficiency. Various dyes can be degraded almost completely after being irradiated for 90 min under visible light. In a word, it may provide a facile approach for preparing a photocatalytic membrane with a high catalyst loading amount, a large chemisorption capacity, and high visible-light photoactivity.
研究领域:
材料科学
·
环境工程
·
光催化
·
高分子科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2016
·
IF 4.509
Lin-Feng Gao,Zhi-Yuan Zhu,Wan-Shu Feng,Qiang Wang,Hao-Li Zhang
One novel cobalt-coordinated graphitic carbon nitride-type polymer (Co-g-CN) integrating the advantages of both molecular catalytic efficiency and nano semiconductor stability was fabricated, which served as homogeneous photocatalyst exhibiting superior hydrogen evolution efficiency (ca. ∼ 12.3 mmol g–1 h–1) under visible light irradiation in the absence of noble metal cocatalyst. Various techniques including laser photolysis and electron paramagnetic resonance were combined to disentangle the underlying photocatalytic mechanism, which suggested that, unlike nano semiconducting catalysis, the multivalent Co metal center of the polymer mediated the electron transfer process, directly got involved in the proton reduction by sequentially exchanging electrons in a way similar to those molecular coordinated catalysts. These findings provide useful insight into the photocatalytic mechanism of the metal center-mediated water splitting process, and the employment of an economical non-noble metal-coordinated polymer as highly efficient catalyst may open a new avenue for long-term conversion of sunlight into sustainable hydrogen energy.
研究领域:
光催化
·
材料化学
·
可再生能源
·
无机化学
·
聚合物化学
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2015
·
IF 4.772
Jingzhong Zhao,Lei Zhang,Weiqiang Xing,Kathy Lu
B/N codoping is an effective way to narrow the band gap of TiO2 to enhance the photocatalytic activity. However, the traditional doping method using ammonia as N source is still unsatisfactory because of its safety risks and high cost. In this work, a benign and cost-effective method has been developed to prepare the B/N codoped TiO2. First, we use TiB2 as the raw material to prepare B-doped TiO2 via a hydrothermal method followed by heat treatment. Then the B/N codoped TiO2 can be simply produced by annealing the mixture of the as-prepared B-doped TiO2 and urea. X-ray diffraction (XRD) and scanning electron microscopy (SEM) results show that the samples present anatase structure and spherical morphology. X-ray photoelectron spectroscopy (XPS) analysis indicates that B and N atoms exist not only on the surface but also in the bulk. Moreover, the content of N atoms decreases with the depth in the sample while Ti3+ content gradually increases with the depth. The UV–vis absorption spectrum shows an extension of light absorption into the full visible region. More importantly, the B/N codoped TiO2 exhibits promoted photocatalytic activity under both UV and visible light than the B-doped TiO2.
研究领域:
材料科学
·
光催化
·
纳米材料
·
无机化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 22
·18577-18582
·
IF 3.289
Yichang Yu,Zhangjun Hu,Yalei Zhang,Hongwen Gao
The title composite was synthesized under facile conditions by hydrolysis and co-precipitation. Through comparative studies, it was found that the morphology, structure and properties were affected by hexadecyl trimethylammonium bromide (CTAB) doping. Although the surface area decreases from 53.5 to 7.5 m2 g−1, it was found that CTAB@BiOCl exhibits higher adsorption capacity than the isolated BiOCl, and still maintains good photocatalytic activity, which is a little worse than the isolated BiOCl has. This was caused by the lower content of BiOCl in CTAB@BiOCl, which is less than 70%. The studies show that, in high concentrations of dye-contaminated water, the composite exhibits strong adsorption capacities of 901 mg g−1 to Congo Red (CR) and 699 mg g−1 to Reactive Red 3 (X3B). In the low-concentration case, it is able to process photocatalysis of those dyes. In the recycling experiment, the CTAB@BiOCl composite was regenerated in situ. And CTAB in the composite was almost completely degraded after five cycles, resulting in the regenerated BiOCl. Subsequently, the surface area of the composite increases from 7.5 to 22.62 m2 g−1, and along with this the adsorption capacities to CR and X3B decrease obviously due to the absence of the CTAB component. In addition, the photocatalysis activity of the generated composite has been promoted to be similar to the isolated BiOCl.
研究领域:
环境科学
·
材料化学
·
光催化
·
水处理
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）