JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 20
·13118-13134
·
IF 3.442
Zhang Xiaorong,Shakeel Muhammad,Li Baoshan,Zhang Jinxi,Wang Lei
Proficient visible light-driven photocatalyst for waste water remediation has gained immense attention in decades. Herein, novel foamed zinc oxide–silica spheres and carbon nitride nanocomposite (FZSS@CN) were fabricated by hydrothermal and calcination treatments. The resulting nanocomposite was passed through complete characterization profiling for structural, optical and kinetics properties. The photocatalytic performance was investigated by the degradation of textile dyes such as methylene blue (MB) and Rhodamine B (RhB) under visible light. The optimized nanocomposite (FZSS@CN-10) exhibited the superior photocatalytic degradation performance up to 95% for MB and 90% for RhB with rate constant ( k ) = 0.0516 min −1 and 0.0464 min −1 , respectively. This excellent performance was attributed to the hierarchical morphology, high surface area and mesoporous channels with open cavities. This uniqueness is responsible to enhance the optical and kinetic capabilities of the material for effective photocatalysis. More interestingly, the crystalline structure of the recycled sample has more sharp peaks than fresh sample. This phenomenal behavior leads to a new method for the fabrication of effective materials in this field.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Ruiyang Zhang,Penghui Li,Fang Wang,Liqun Ye,Abhijeet Gaur,Zeai Huang,Ziyan Zhao,Yang Bai,Ying Zhou
Atomically dispersed atom catalysts with atomically distributed active metal centers have attracted great attention owing to the maximum atom efficiency and excellent selectivity. Herein, for the first time, we found atomically dispersed Mo atoms can be formed on g-C 3 N 4 , and induce its amorphous transformation. This amorphous transformation leads to the formation of strong band tails with remarkably enhancing the absorbance edge of Mo-C 3 N 4 up to 750 nm, resulting in almost whole visible-light range absorption. The formation of new Mo-C and Mo-N bonds due to strong interfacial interaction between atomically dispersed Mo atoms and g-C 3 N 4 provide new electron and hole transport pathways to accelerate the separation of charge carriers. As a result, amorphous Mo/C 3 N 4 (a-Mo/C 3 N 4 ) reveals excellent photoreduction of CO 2 , yielding CO and H 2 productions of 18 and 37 μmol g −1 h −1 under visible-light illumination (λ > 420 nm), which manifest a remarkable 10.6- and 4-folds enhancement of that over crystalline g-C 3 N 4 . This finding provides a conceptually different approach to fabricate high-efficient photocatalyst through the strong interfacial interaction between atomically dispersed metal atoms and host.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Yunlong Zhou,Xiaoyuan Ye,Dongyao Lin
As an increasing number of photocatalysis are developed, non-noble metal photocatalysts that can be synthesized from earth-abundant and low-cost materials have received a great deal of attention. In this study, non-noble metal WS 2 /g-C 3 N 4 photocatalysts were prepared by a facile one-pot synthesis. Varying masses of tungsten disulfide (WS 2 ) were successfully loaded onto g-C 3 N 4 and characterized by X-ray diffraction (XRD), inductively coupled plasma optical emission spectrometry (ICP-OES), thermogravimetric analysis (TGA), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). These results indicated that the WS 2 was successfully synthesized and immobilized closely on the surface of g-C 3 N 4 to form a sheet-like nanostructure . The H 2 generation results showed that the optimal photocatalyst was 0.3-WCN because it had the highest photocatalytic H 2 production of 154 μmol h −1 g −1 , which is 34 times higher than bare g-C 3 N 4 and even higher than 0.3 wt% platinum-loaded g-C 3 N 4 . Additionally, the possible mechanism of the photocatalyst was studied by photoluminescence (PL), UV–vis diffuse reflectance spectroscopy (UV–vis DRS) and photoelectrochemical tests, which showed that the WS 2 played a key role in improving the efficiency of separation and migration of the photogenerated carriers in g-C 3 N 4 .
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Yonghong Wang,Zeyang Fang,Ge Ning,Shaoming Mao,Yaohui Wu,Shun Wu,Gao-Qiang Liu
After successively introducing elements of a triple-helix aptamer probe (TAP) and a luminol–hydrogen peroxide (H 2 O 2 ) solution, we proposed a brand-new chemiluminescence (CL)-based biosensor for the assay of ochratoxin A (OTA). Primarily, the TAP contains an aptamer loop, two DNA segment stems, and a triplex-forming oligonucleotide (signal probe). In the presence of a target, the aptamer sequence binds to the target with an impressive affinity. This association leads to a conformational change in the TAP, thus releasing the signal probe. Sequentially, with the participation of hemin and potassium ions, the dissociated probe forms into a G-quadruplex structure that is capable of catalyzing luminol to produce CL mediated by H 2 O 2 . In contrast, in the absence of the target, a low background signal remains. Using this approach of combining a novel TAP switch with a G-quadruplex-catalyzed luminol-H 2 O 2 system, we presented a label-free and signal-on CL strategy for the measurement of OTA. Under optimal conditions, the gradually strengthened signal maintained a linear dependence on target concentrations ranging from 0.1 ng/mL to 2.0 ng/mL, and the detection limit was as low as 0.07 ng/mL. This newly designed, simple, and cost-effective protocol affords high sensitivity, specificity, suitability, and efficacy for biosensing. Thus, this protocol is attractive for a range of target quantifications, with only the matched aptamer requiring replacement (no redesign of signal probes).
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MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Jirong Bai,Haiyang Xu,Gang Chen,Wenhua Lv,Zhijiang Ni,Zhilei Wang,Jiaying Yang,Hengfei Qin,Zheng Zheng,Xi Li
α-Fe 2 O 3 /porous g-C 3 N 4 (α-Fe 2 O 3 /PCN) photocatalysts were fabricated via a facile and green method. Structural characterization indicated α-Fe 2 O 3 nanoparticles were successfully loaded onto PCN. The α-Fe 2 O 3 /PCN nanocomposites were proven durable with significantly enhanced photocatalytic activity for Rhodamine B photodegradation than the single components under visible light irradiation. The improved photoactivity was mainly attributed to the broadened visible light absorption, enriched active sites, and formation of α-Fe 2 O 3 /PCN heterojunction that addressed the recombination of photoinduced electrons and holes. The α-Fe 2 O 3 /PCN hybrids also showed high recyclability and chemical stability.
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POLYMER SCIENCE SERIES A
·
2019
·Vol. 61
·期 3
·317-324
·
IF 0.984
Ting Gu,Zhu Dayong,Lu Yue,Lu Shengjun
Abstract Polylactic acid (PLA) and poly(butylene adipate- co -terephthalate) (PBAT) were blended in a twin-screw extruder with a compatibilizer of PLA grafted using glycidyl methacrylate (PLA- g -GMA), providing PLA- g -GMA/PLA/PBAT composites. The chemical structures of the composites were determined using Fourier-transform infrared spectroscopy (FTIR). The effects of the PLA- g -GMA amount on the thermal properties, rheological performance, and mechanical behavior of the composites were studied through differential scanning calorimetry (DSC) using an advanced rheometer and material testing machine. The results revealed that the reaction between the PLA/PBAT and epoxy groups within the PLA- g -GMA promotes an entanglement between molecular chains, which increases the glass transition temperature T g , cold crystallization temperature T c , and melting temperature T m of the samples. Moreover, the PLA- g -GMA/PLA/PBAT composites show higher tensile and notch impact strengths than PLA/PBAT.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Ruiying Li,Qiang Liu,Yan Jin,Baoxin Li
A short G-rich sequence with three G-tracts can form a G-triplex (G3), a recently identified noncanonical DNA structure . Until now, very limited functional study and application of G3 is reported. Herein, we integrated G3 with isothermal exponential amplification reaction (EXPAR) for achieving simple and sensitive biosensing strategy. In this strategy, the cascade EXPAR cycles produces larger numbers of short G-rich sequences, which self-assemble into G3 structure and then bind hemin to form G3/hemin DNAzyme. This G3/hemin DNAzyme–based EXPAR strategy could detect as low as 4.7 fM target DNA with colorimetric detection, and the sensitivity of G3/hemin DNAzyme–based EXPAR strategy was much higher than that of the conventional G-quadruplex/hemin DNAzyme–based EXPAR strategy. We explored the reason for higher sensitivity of G3/hemin DNAzyme–based EXPAR strategy. The experimental results demonstrated that G3/hemin DNAzyme is an ideal signal generator for EXPAR-based biosensing platform. This work opens a new avenue to develop effective signal amplification strategy for ultrasensitive biosensing. This work is also helpful for a deeper understanding of G3 structure and the future application of G3.
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PubMed
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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
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2019
·Vol. 108
·期 3
·1077-1084
·
IF 2.674
Zhaoliang Guo,Qiannan Zhao,Yuqian Zhang,Bingdong Li,Lijuan Li,Liwei Feng,Manman Wang,Xianguang Meng,Guifu Zuo
An oxidized, porous graphitic carbon nitride nanosheets (CNNs) was successfully obtained via a bottom-up approach. The inner filter effect (IFE) of Fe (III) tetrakis (1-methyl-4-pyridyl) porphyrin pentachlorideporphyrin pentachloride (FeTMPyP) on the CNNs results in fluorescence quenching of the CNNs due to the overlap of FeTMPyP absorbance band and CNNs emission band. It is interesting that the quenched fluorescence could be “turned on” in response to the participation of H 2 O 2 , which caused by decomposition of FeMPyP. In this study, for the first time, a porous fluorescence probe based on CNNs and FeTMPyP was designed and an excellent H 2 O 2 detection performance with a large detection range of 0.1 ~ 100 μM and a detection limit of 0.07 μM was achieved. Furthermore, the proposed method was successfully used for H 2 O 2 detection in RAW 264.7 cells.
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PubMed
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MATERIALS CHEMISTRY AND PHYSICS
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2019
·
IF 2.781
Zhilin Li,Chongyue Jin,Chunmei Lv,Min Wang,Jin Kang,Shiyu Liu,Yuanhua Xie,Tong zhu
To further promote the visible-light photocatalytic efficiency of Bi 24 O 31 Cl 10 , g-C 3 N 4 /Eu(III) doped Bi 24 O 31 Cl 10 heterojunction composites (CN/Eu-BCO) were successfully synthesized via modified solution combustion and immersion-calcination method. The effects of Eu(III) dopants and g-C 3 N 4 coupling on the micro-structures and the photocatalytic efficiency of Bi 24 O 31 Cl 10 towards Rhodamine B (RhB) degradation were investigated in detail. The results displayed that Eu(III) doping and coupling with g-C 3 N 4 can largely promote the photocatalytic efficiency of Bi 24 O 31 Cl 10 . The photodegradation rate of RhB over 5CN/0.01Eu-BCO can reach to be 91.9% in 40 min, which was 8.46 folds of Bi 24 O 31 Cl 10 , 1.91 folds of 0.01Eu-BCO, and 1.72 folds of 5CN/BCO. The main radical species being responsible for RhB degradation were ● O 2 − and ● OH. Furthermore, 5CN/0.01Eu-BCO composite photocatalyst exhibited good reusability and stability.
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Nanoscale
·
2018
·Vol. 10
·期 26
·12535-12542
·
IF 7.233
Peng-Fei Guo,Dan-Dan Zhang,Zhi-Yong Guo,Xi-Ming Wang,Meng-Meng Wang,Ming-Li Chen,Jian-Hua Wang
A novel organic–inorganic hybrid was prepared by anchoring (3-aminopropyl)triethoxysilane (APTES) on the surface of monolayer titanate nanosheets and subsequent modification with hydrophilic polyethylene glycol (PEG). The PEGylated hydrophilic monolayer titanate nanosheets were abbreviated as PEG–APTES–TiNSs, and they exhibit a lateral dimension of dozens of nanometers and a thickness of ca. 1.9 nm. PEGylation of the titanate nanosheets significantly improved their selectivity toward the adsorption of glycoproteins through strong hydrophilic interaction, providing an adsorption capacity of 2540.9 mg g−1 for immunoglobulin G (IgG). The retained IgG is readily collected at a recovery rate of 83.4% with 0.5% (m/v) ammonium hydroxide (NH4OH) as the stripping reagent. PEG–APTES–TiNSs are applied for the selective adsorption of IgG from human serum, which is further confirmed by SDS-PAGE assay.
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PubMed
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 33
·期 3
·e4683
·
IF 3.581
Jiang Li,Xiaolu Zhu,Fengxian Qiu,Tao Zhang,Fengping Hu,Xiaoming Peng
Introducing plasmonic metals into semiconductor materials has been proven to be an attractive strategy for enhancing photocatalytic activity in the visible region. In this work, a novel and efficient Ag/Ag 2 WO 4 /g-C 3 N 4 (AACN) ternary plasmonic photocatalyst was successfully synthesized using a facile one-step in situ hydrothermal method. The composition, structure, morphology and optical absorption properties of AACN were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and UV–visible diffuse reflectance spectroscopy, respectively. Photocatalytic performance of AACN was evaluated via rhodamine B and tetracycline degradation. The results indicated that AACN had excellent photocatalytic performance for rhodamine B degradation with a rate constant of 0.0125 min −1 , which was higher than those of Ag 2 WO 4 and Ag/Ag 2 WO 4 . Characterization and photocatalytic tests showed that the strong coupling effect between the Ag/Ag 2 WO 4 nanoparticles and the exfoliated ultrathin g-C 3 N 4 nanosheets was superior for visible-light responsivity and reduced the recombination rate of photogenerated electrons and holes. A proposed mechanism is also discussed according to the band energy structure and the experimental results.
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ACS Catalysis
·
2018
·
IF 11.384
Yizhou Wu,Jesse Ward-Bond,Donglin Li,Shaohua Zhang,Jiafu Shi,Zhongyi Jiang
Graphitic carbon nitride (g-C3N4) is an emergent metal-free photocatalyst because of its band position, natural abundance, and facile preparation. Synergetic intensification of charge generation and charge transfer of g-C3N4 to increase solar-to-chemical efficiency remains a hot yet challenging issue. Herein, a nanoshell with two moieties of α-Fe2O3 and carbon (C) is in situ formed on the surface of a g-C3N4 core through calcination of Fe3+/polyphenol-coated melamine, thus acquiring g-C3N4@α-Fe2O3/C core@shell photocatalysts. The α-Fe2O3 moiety acts as an additional photosensitizer, offering more photogenerated electrons, whereas the C moiety bridges a “highway” to facilitate the electron transfer either from α-Fe2O3 moiety to g-C3N4 or from g-C3N4 to C moiety. By tuning the proportion of these two moieties in the nanoshell, a photocurrent density of 3.26 times higher than pristine g-C3N4 is obtained. When utilized for photocatalytic regeneration of reduced nicotinamide adenine dinucleotide (NADH, a dominant cofactor in biohydrogenation reaction), g-C3N4@α-Fe2O3/C exhibits an equilibrium NADH yield of 76.3% with an initial reaction rate (r) of 7.7 mmol h–1 g–1, among the highest r for photocatalytic NADH regeneration ever reported. Manipulating the coupling between charge generation and charge transfer may offer a facile, generic strategy to improve the catalytic efficiency of a broad range of photocatalysts other than g-C3N4.
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