SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yifang Mi,Na Wang,Xingyu Fang,Jia Cao,Meng Tao,Zhihai Cao
Integration photocatalysis with membrane technology offers a potential solution to combat fouling dilemma. Herein, an interfacial polymerization polyamide nanofiltration (NF) membrane with self-cleaning ability was prepared by incorporation of carbon quantum dots /titanium dioxide (CQD/TiO 2 ) nanoparticles (NPs). The addition of hydrophilic CQD/TiO 2 NPs promoted membrane hydrophilicity and endowed the NF membrane with high water flux (67.22 L m −2 h −1 ), which was 1.8 times compared with that of the pristine membrane, and salt rejection of Na 2 SO 4 (96.7%). Simultaneously, the prepared NF membranes maintained high dye rejection to methyl blue (MYB, 99.1%) and congo red (99.8%). Moreover, visible light-driven photocatalytic ability of CQD/TiO 2 allowed the membranes to efficiently degrade MYB dyes absorbed on the membrane surface. In stark contrast to the results of cyclic physical water cleaning, the flux recovery ratios were maintained 97–98% without sacrificing MYB rejections during the cyclic fouling-irradiation process, demonstrating stable and efficient self-cleaning performance. Even after continuous membrane fouling for 72 h, the water flux only decreased by 6.7% after visible light irradiation, surpassing the performance of pristine polyamide NF membrane (decreased by 23.4%). The hydrophilicity and visible light-driven self-cleaning ability make the prepared NF membrane via interfacial polymerization highly suitable for efficient dye wastewater treatment.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Mei Yu,Jing Shang,Yu Kuang
Graphene oxide (GO), a new and promising material, has been widely used as a co-catalyst in photocatalytic reactions; however, its capacity as a sole photocatalyst has rarely been investigated. In this study, ultraviolet (UV) light irradiation was used as a modification method to obtain reduced GO (rGO) samples. The samples were used as photocatalysts to examine their visible light photocatalytic activity toward hexavalent chromium (Cr(VI)) removal. Atomic force microscopy (AFM), X-ray diffraction (XRD), UV–vis spectrophotometry, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and electron spin resonance (ESR) spectroscopy were applied to interpret the surface and structure changes with UV irradiation. The oxygen-containing functional groups (OFGs) on the GO surface were reduced to defective carbons and π-conjugated C=C (sp 2 domains) under UV light; this led to a decrease in the interlayer distance between GO sheets, GO fragmentation, and increased disorder on the GO surface. The restoration of sp 2 domains led to a narrower band gap of GO, which favored the rGO excitation by visible light to generate electron-hole pairs. The rGO pre-irradiated with UV for 1h (rGO-1), possessing the highest defect density and electron generation efficiency, exhibited the best Cr(VI) reduction efficiency, which was about three times that of the GO sample; moreover, it outperformed most of the reported GO-based nanomaterials. In addition, low pH and the addition of citric acid as a hole scavenger could further improve the photocatalytic activity. This study proves that GO or rGO can be used as a sole photocatalyst under visible light to remove environmental pollutants such as heavy-metal ions, and it paves the way for the development of this kind of material and its UV-irradiation modification for further applications.
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Nanomaterials
·
2021
·Vol. 11
·期 1
·104
·
IF 5.076
Hongyu Ma,Yaqi Tan,Zhifei Liu,Jianhong Wei,Rui Xiong
Photocatalytic hydrogen evolution is a promising “green chemistry” route driven by sunlight for the direct water splitting into value-added hydrogen energy. Herein, with the object of exploring the effect of CuO loading on W18O49photocatalytic activity, a 3D Urchin-like CuO modified W18O49(CuO/W18O49) microspheres with different CuO loadings were synthesized via thermochemical precipitation combined with solvent-thermal method. The obtained CuO/W18O49microspheres were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL), etc. The results infer that the urchin-like 3D morphology with a high surface area and abundant 1D nanowires promotes electron transfer, the introduction of CuO further increases the number of active sites, thereby ensuring fast interfacial charge transfer to improve photocatalytic performance. During photocatalytic H2evolution from water splitting, 5 wt.% CuO/W18O49shows the optimal performance, the H2yield is almost 3.22 times that of the undoped counterparts. This work presents that oxygen-vacancy-rich heterojunction nanocomposites can be used as a new strategy to design materials with high photocatalytic activity.Keywords:photocatalysis;CuO modification;oxygen vacancy;W18O49microspheres;water splitting
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高影响因子
Materials Express
·
2019
·Vol. 9
·期 1
·65-72
·
IF 1.465
Han Xue,Wang Da,Guo Zhongnan,Huang Lin,Peng Yuan,Lin Jiawei,Yuan Wenxia
The SiC/CdS semiconducting composites have been reported to show excellent synergistic effect for the photocatalytic water splitting to produce H2 (J. Mater. Chem. A (2014) 2:6296–6300). In this work, the mesoporous SiC prepared via a one-step nanocasting process
has been adopted to replace the commercial micro-SiC, to improve the weak light absorption of SiC which suppresses the photocatalytic activity in previous literature. It has been demonstrated that the mesoporous SiC/CdS composite with suitable coverage ratio of SiC (with the molar ratio of
SiC:CdS as 1:1) shows stronger light absorption and enhanced charge transfer rate. In consequence, the hydrogen evolution rate reaches 952 μmol · h–1· g–1 in the absence of noble metal co-catalyst, which is two times of the micro SiC/CdS
system. Our work provides an effective route to enhance the photocatalysis in SiC-based heterojunction materials. This strategy can also be extended in other Z-scheme photocatalytic systems.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 52
·79184-79198
·
IF 5.19
Zhao Yajuan,Dang Pu,Gao Yaqian,Li Yan,Xie Huidong,Yang Chang
Co 3 O 4 /Bi 4 O 7 /Bi 2 O 3 (CBB) composites were prepared, in which Co 3 O 4 was synthesized from Co-MOF as precursor. The peroxymonosulfate (PMS) activated by CBB catalyst under visible light was used to degrade tetracycline (TC). Owing to the synergistic effect of photocatalysis and PMS activation, 98.4% of TC was removed within 60 min. The optimal loading of Co 3 O 4 was determined, and the influence of PMS dosage, initial pH, and disturbing anions on the degradation effect were investigated. The “CBB + Vis + PMS” system showed good reusability, and the degradation was only reduced by 1.7% after 5 cycles. This system also had a good degradation of other five pollutants. The quenching experiment showed that holes (h + ), superoxide radicals (·O 2 − ), and singlet oxygen ( 1 O 2 ) were the main active species. The degradation products of TC were determined by liquid chromatography-mass spectrometry, and the degradation pathway was proposed. Finally, a double Z-scheme degradation mechanism was proposed in the “CBB + Vis + PMS” system. The peroxymonosulfate activated by CBB under visible light to degrade organic pollutants has widespread application prospects in environmental remediation. Graphical abstract
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Materials Today Chemistry
·
2022
·
IF 7.613
Jian-Qiang Zhao,Hui Ge,Yu-Fang Wu,Wen-Jie Xu,Kai Xu,Jia-Qian Ma,Qian-Lu Yang,Cheng-Yang Yue,Xiao-Wu Lei
Highly efficient and narrowband blue light-emitting performance is extremely crucial for the optoelectronic applications of organic-inorganic hybrid perovskites . However, the not yet viable approach has been shown to simultaneously improve photoluminescence quantum yield (PLQY) and narrow linewidth of blue light emission. Herein, a new crystal rigidifying strategy is proposed as a viable dual-optimization avenue. Specifically, we perform a post-synthetic technique on hybrid cadmium halides and successfully convert zero-dimensional (0D) DMP-0-CdBr 4 to one-dimensional (1D) DMP-1-CdBr 3 , accompanied by luminescent transformation from sky-blue (470 nm) to deep-blue (432 nm) emissions. The structural evolution from discrete block to infinite chain significantly enhances the crystal rigidity, which results in narrower emission linewidth (89 to 50 nm) and increased color purity (74.5% to 96.7%). Synchronously, the PLQY also realizes a notable enhancement from 14.0% to 52.3%. Systematical characterizations demonstrate that enhanced crystal rigidity simultaneously weakens the electron-phonon interaction and slows down nonradiative decay, which narrows the emission linewidth and boosts the PLQY. The highly efficient light-emitting performance enables them as excellent down-conversion blue phosphors to fabricate solid-state LED giving bright warm white light with high color rendering index of 95.4. This work paves a novel structural optimization way to rationally design or fine-tune high-performance blue-light emitting halides.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2014
·Vol. 16
·期 24
·12008-12013
·
IF 4.198
Yan Gao,Linlin Zhang,Xin Ding,Licheng Sun
Photoactive anodes consisting of Ru(bpy)3 type photosensitizer 1 and molecular catalysts 2 and 3 on nanostructured TiO2 have been assembled in functional devices for successful light driven water splitting. From their performance measurements we found that the photoanode TiO2(1 + 3) in which the molecular ruthenium catalyst and the phosphonate anchoring group are linked by a flexible –CH2CH2CH2– chain showed a significantly higher photocurrent density than the photoanode TiO2(1 + 2) with only –CH2– linkage. The possible reasons for the different water splitting performance of otherwise identical devices are discussed.
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高影响因子
Advanced Science
·
2023
·Vol. 10
·期 9
·2206070
·
IF 15.1
Wentao Wu,Xiaoying Shang,Zhijin Xu,Huang Ye,Yunpeng Yao,Xueyuan Chen,Maochun Hong,Junhua Luo,Lina Li
Organic–inorganic hybrid perovskites carry unique semiconducting properties and advanced flexible crystal structures. These characteristics of organic–inorganic hybrid perovskites create a promising candidacy for circularly polarized light (CPL) detection. However, CPL detections based on chiral perovskites are limited to UV and visible wavelengths. The natural quantum well structures of layered hybrid perovskites generate strong light–matter interactions. This makes it possible to achieve near-infrared (NIR) CPL detection via two-photon absorption in the sub-wavelength region. In this study, cooperative strategies of dimension increase and mixed spacer cations are used to obtain a pair of chiral multilayered perovskites (R- β -MPA)EA 2 Pb 2 Br 7 and (S- β -MPA)EA 2 Pb 2 Br 7 (MPA = methylphenethylammonium and EA = ethylammonium). The distinctive bi-cations interlayer and multilayered inorganic skeletons provide enhanced photoconduction. Moreover, superior photoconduction leads to the prominent NIR CPL response with a responsivity up to 8.1 × 10 −5 A W −1 . It is anticipated that this work can serve as a benchmark for the fabrication and optimization of efficient NIR CPL detection by simple chemical design.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Houchao Shan,Di Cai,Xiaoxia Zhang,Qian Zhu,Peiyong Qin,Jan Baeyens
Two-dimensional covalent organic frameworks (2D-COFs) with permanent porosity, structural controllability, and excellent stability, are receiving ongoing attention in metal-free heterogeneous photocatalysis of organic conversions. In order to construct high optical performance COFs for selective organic transformation, herein, 2D porphyrin-based donor-acceptor (D-A) type COFs were prepared by adjusting the morphology and structure. The as-synthesized COFs facilitate charge transfer and separation of photogenerated electron-hole pairs, efficaciously producing superoxide radical anions as mediates for selective oxidation of sulfides (97% conversion and 99% of selectivity) and reductive dehalogenation of 2-bromoacetophenone (up to 99% conversion and 82% of yield). The COFs have excellent stability and recyclability , demonstrating that the 2D D-A type COFs are attractive as heterogeneous photocatalyst for visible light driven organics transformation.
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Catalysts
·
2021
·Vol. 12
·期 1
·22
·
IF 4.146
Jingfei Luan,Zhijie Wei,Bowen Niu,Guangmin Yang,Cisheng Huang,Bingbing Ma,Wenlu Liu
A new type of Gd2BiTaO7nanocatalyst (GBT) was synthesized by a high-temperature solid-phase method, and a heterojunction photocatalyst, which was composed of GBT and silver phosphate (AP), was prepared by the facile in-situ precipitation method for the first time. The photocatalytic property of GBT or the Ag3PO4/Gd2BiTaO7heterojunction photocatalyst (AGHP) was reported. The structural properties of GBT and AGHP were characterized by an X-ray diffractometer, scanning electron microscope–X-ray energy dispersive spectra, an X-ray photoelectron spectrograph, a synchrotron-based ultraviolet photoelectron spectroscope, a Fourier transform infrared spectrometer, an UV-Vis diffuse reflectance spectrophotometer and an electron paramagnetic resonance spectrometer. The results displayed that GBT was well crystallized with a stable cubic crystal system and space groupFd3m. The lattice parameter or band gap energy of GBT was found to be a = 10.740051 Å or 2.35 eV, respectively. After visible light irradiation of 30 min, the removal rate of bisphenol A (BPA) reached 99.52%, 95.53% or 37.00% with AGHP as the photocatalyst, with Ag3PO4and potassium persulfate (AP-PS) as photocatalysts or with N-doped TiO2(NT) as a photocatalyst, respectively. According to the experimental data, it could be found that the removal rate of BPA with AGHP as a photocatalyst was 2.69 times higher than that with NT as a photocatalyst. AGHP showed higher photocatalytic activity for photocatalytic degradation of BPA under visible light irradiation compared with GBT or AP-PS or NT. The removal rate of total organic carbon (TOC) was 96.21%, 88.10% or 30.55% with AGHP as a photocatalyst, with AP-PS as photocatalysts or with NT as a photocatalyst after visible light irradiation of 30 min. The above results indicated that AGHP possessed the maximal mineralization percentage ratio during the process of degrading BPA compared with GBT or AP-PS or NT. The results indicated that the main oxidation radical was•OH during the process of degrading BPA. The photocatalytic degradation of BPA with AGHP as a photocatalyst conformed to the first-order reaction kinetics. This study provided inspiration for obtaining visible light-responsive heterojunction photocatalysts with high catalytic activity and efficient removal technologies for organic pollutants and toxic pollutants, and as a result, the potential practical applications of visible light-responsive heterojunction photocatalysts were widened. The subsequent research of thin-film plating of the heterojunction catalysts and the construction of complete photoluminescent thin-film catalytic reaction systems, which utilized visible light irradiation, could provide new technologies and perspectives for the pharmaceutical wastewater treatment industry.Keywords:Gd2BiTaO7;Ag3PO4/Gd2BiTaO7heterojunction;potassium persulfate;bisphenol A;photocatalytic degradation;visible light irradiation;N-doped TiO2
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高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Xiaojie Song,Xiufang Wang,Weiwei Dong,Qishu Qu,Haichen Wang,Fan Yang
Solar-to-chemical energy conversion via heterogeneous photocatalysis is one of the effective approaches to tackle the growing environmental and energy challenges. Homogeneously dispersed silver nanoparticles (Ag NPs) and cadmium sulfide nanoparticles (CdS NPs) with average particle size not>20 nm were fabricated on the surface of titanium dioxide nanotubes (TNTs) (Ag/CdS/TNTs) with the help of sodium dodecyl benzene sulfonate (SDBS). Herein, more surface active sites are created on the surface of nanocomposites. The experimental results demonstrate that the photocurrent intensity of the nanocomposites obviously increased, which effectively improves the photocatalytic activity. The results of photocatalytic experiments indicated that using triethanolamine (TEOA) and acetonitrile (MeCN) as sacrificial agents, the nanocomposites afford the CO yield from CO 2 (1455.6 μmol‧g −1 ‧h −1 ). Besides, Ag/CdS/TNTs nanocomposites displayed the H 2 evolution rate of 3700.57 μmol‧g −1 ‧h −1 , which was twice as much as pure TiO 2 NPs. The increase in the photocatalytic ability of the nanocomposites is basically attributed to the three materials formation S-scheme heterojunction which reduce the recombination probability of the photo-induced electrons and holes and thus enhances the photocatalytic activitys. Ultimately, a photocatalytic reaction mechanism is proposed for Ag/CdS/TNTs nanocomposites in the reduction of CO 2 .
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Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 11
·3057-3062
·
IF 5.934
Weixuan Zeng,Sheng Cao,Lulu Qiao,Anquan Zhu,Quanyin Ma,Xiewen Xu,Yi Chen,Jun Pan
In the present study, we report a one-step hydrothermal synthesis of visible-light response Cr-doped Sr2Ta2O7 nanosheets for photocatalytic hydrogen generation. It is discovered that the Cr ion is successfully doped into the Sr2Ta2O7 nanosheet crystal lattice and uniformly distributed without changing the crystal structure and morphology of the Sr2Ta2O7 host. Compared to pristine Sr2Ta2O7, the as-prepared Cr-doped Sr2Ta2O7 photocatalysts show enhanced photocatalytic activity for hydrogen generation under visible-light irradiation. The spectroscopy and Mott–Schottky results reveal that proper Cr doping can narrow the band gap of Sr2Ta2O7 as well as facilitate the separation of photo-generated electrons and holes, thus enhancing the photocatalytic performance under visible-light irradiation. This work provides a simple approach to fabricate visible-light active tantalum-based oxide photocatalysts.
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