COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Meiling Chen,Xiankun Lin,Chenggen Zeng,Qiang He
Interfacial solar steam generation is emerging as a promising high-efficiency strategy to produce clean water by harvesting and converting clean solar energy to the localized heat. It is highly desirable to introduce robust materials that are able to bear the extreme conditions for advanced applications of solar steam generation. Here, we demonstrate an all-in-one interfacial solar evaporator made from poly( p -phenylene benzobisoxazole) nanofiber (PBONF)/graphene oxide (GO) and PBONF/reduced graphene oxide (RGO) composite aerogels with high porosity, robust mechanical properties, and excellent thermal insulation performance. The evaporators of PBONF/RGO composite aerogel show fast and durable solar-vapor conversion with a high efficiency of 98.4 % under unconcentrated one sun irradiation. The PBONFs not only reinforce the mechanical properties of composite aerogels, but also affords them great potential applications in wastewater purification in some extreme environment, for instance, aerospace.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Zipeng Feng,Yanwei Sui,Zhi Sun,Jiqiu Qi,Fuxiang Wei,Yaojian Ren,Zhenzhen Zhan,Meihua Zhou,Dongmei Meng,Lijun Zhang,Lan Ma,Qun Wang
Developing cost-effective and binder-free bifunctional electrocatalysts to boost the hydrogen and oxygen evolution reactions are crucial for overall water splitting. In this work, three-dimensional hierarchical Mn-Co-P/NF electrodes on nickel foam are synthesized by electrodeposition and chemical vapor deposition (CVD) firstly. Provide an excellent and controllable synthesis method by controlling the electrodeposition time and phosphating temperature. The Mn-Co-P composite exhibits the characteristics of vertically grown porous nanosheets, which can effectively expose the active sites. Benefit from the rational design with in-situ growth of functional materials and the unique structure, the Mn-Co-P/NF presents excellent electrocatalytic activities and stability with lower overpotentials of 63 mV and 310 mV to deliver 10 mA cm −2 for hydrogen evolution reaction (HER) and 10 mA cm −2 for oxygen evolution reaction (OER), respectively. Moreover, when directly used as a positive electrode and a negative electrode to form an electrocatalytic device to complete the overall water splitting, Mn-Co-P/NF merely requires a small cell voltage of 1.70 V to obtain 20 mA cm −2 . This work offers a controllable method to design and synthesize highly efficient and stable transition metal phosphide catalysts for overall water splitting and other catalytic fields.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 24
·22028-22038
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IF 2.22
Peng Qirui,Yang Lu,Zhao Qiuying,Ma Yizhou,Ji Hongli,Qiu Jinhao
The development of piezoelectric polymers with superior electromechanical performance is a demand in the areas of flexible sensors, actuators and tissue engineering, among others. In this work, we reported a novel sandwich-structured piezoelectric composites comprising of poly(vinylidene fluoride-hexafluoropropylene) [P(VDF-HFP)] and Prussian blue analogs Co 3 [Co(CN) 6 ] 2 with excellent electromechanical activities. The large specific surface area, unique three-dimensional porous nanostructure and redox behavior of Co 3 [Co(CN) 6 ] 2 appeared to significantly promote the interfacial coupling effect within P(VDF-HFP), resulting in enhanced electromechanical response. Moreover, the sandwich structure topological design would enlarge the interfacial coupling effect, strengthen the breakdown strength and consequently raise the electromechanical performance. For instance, a maximum piezoelectric coefficient d 33 of ~ 41 pC/N can be achieved in the sandwiched composites at a loading of 0.8 wt%, which is 1.78 times that of pure P(VDF-HFP). Furthermore, the sandwiched composites possess superior electromechanical coupling factor k 33 up to 0.215, while that of pure P(VDF-HFP) is only 0.134.
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JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Dong Liu,Huijun Li,Ranpeng Gao,Qian Zhao,Zhongzhi Yang,Xia Gao,Zhe Wang,Fengquan Zhang,Weidong Wu
Elimination of antibiotics such as tetracycline hydrochloride (TC) from wastewater is of great significance, but still faces challenges. Herein, for the first time, I and P co-doped TiO 2 catalysts were prepared via a hydrolysis method. We also reported a simple method to prepare I and P co-doped TiO 2 photoelectrodes, which exhibited preeminent photoelectrocatalytic (PEC) performance for the decomposition of TC. The synergistic effect of I and P co-doping could significantly improve the charge separation rate and enhance the light absorption capacity of TiO 2 , leading to an enhancement of PEC activity. The main factors affecting the PEC performance were investigated, and the highest degradation rate constant (4.20 × 10 −2 min −1 ) was achieved when the doping content of P was 4 at% (ITP-4 photoelectrode) at pH 11.02 under visible light. The Langmuir–Hinshelwood kinetic model and active species trapping experiments were selected to investigate the degradation mechanism of TC. The results suggest that the hydroxyl radicals and photogenerated holes were the main active species that were responsible for the decomposition of TC. Moreover, the degradation pathways of TC based on the intermediates also demonstrated that the hydroxyl radicals and holes showed a principal role in degrading TC.
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Journal of Inorganic and Organometallic Polymers and Materials
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2020
·Vol. 31
·期 6
·2381-2392
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IF 1.941
Meng Jin,Ren Mingfei,Wang Siyu,Gao Jie,Shan Xiaojing,Hu Jie
Every year, a large amount of waste water containing phenol derivatives is produced in industrial production, which causes serious pollution problem. In the present work, a dually photo- and thermo-responsive adsorbent was developed to remove p -nitrophenol in aqueous solution. N -isopropyl acrylamide was polymerized to build up the thermo-sensitive network of the adsorbent; and cyclodextrin/azobenzene supramolecular complex was grafted on the backbone to act as the photo-responsive adsorbing unit. Under low temperature and 365 nm irradiation, the adsorbent was found in swelling state. In this state, p -nitrophenol was easily caught and removed from aqueous solution by cyclodextrin cavities and azobenzene moieties grafted on the polymer chains. Most interesting, when irradiated at 430 nm, the inclusion of cyclodextrin cavities with azobenzene moieties let freedom of the p -nitrophenol molecules adsorbed previously; at this time if increasing the temperature up to 40 °C, the free p -nitrophenol molecules were forced out owing to the shrinkage of the poly( N -isopropylacrylamide) network. So, without any organic solvent, the adsorbent can be regenerated directly in water. It avoids the secondary pollution caused by traditional regenerating process of adsorbents with organic solvent, which is an important advantage for its practical application of the adsorbent.
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COMPOSITES SCIENCE AND TECHNOLOGY
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2020
·
IF 7.094
Qiuying Zhao,Lu Yang,Qirui Peng,Yizhou Ma,Hongli Ji,Jinhao Qiu
Dielectric polymer/composites films with excellent capacitive performance has initiated enormous interest from both academic and industry because of their great potential as flexible and light-weight electrostatic capacitors for modern electric and electronic systems. In this work, we report a novel flexible dielectric composite film consisting of poly (vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) and dopamine-modified metal-organic frameworks Co 3 [Co(CN) 6 ] 2 (D-M) with excellent capacitive performance for energy storage application . It is found that the D-M show good compatibility with P(VDF-HFP), permitting a high breakdown strength for composites. Meanwhile, the large specific surface area and special porous three-dimensional nanostructure of D-M also has the effect of raising dielectric performance while eliminating the inherent ferroelectric loss of P(VDF-HFP), resulting in considerably promoted discharge energy density . Furthermore, D-M is found to favor the formation of γ-phase in P(VDF-HFP), which is also advantageous to raise the discharge energy density. Upon a small loading of 0.6 wt% D-M, the composites perform a maximum discharge energy density of 11.89 J/cm 3 and discharge efficiency of 71.28% at 350 MV/m, which are 3.04 times and 1.25 times those of the pure P(VDF-HFP) film, respectively. For the first time, we demonstrate that the applicability of flexible D-M/P(VDF-HFP) dielectric composites as advanced electrostatic capacitors, providing a new sight for the design of dielectrics with high capacitive performance.
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Catalysis Science & Technology
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2020
·Vol. 11
·期 2
·612-623
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IF 5.721
Zhuowei Cheng,Junjie Wang,Dongzhi Chen,Jianming Yu,Shihan Zhang,Shuang Wang,Yunfei Dai
Volatile organic compounds (VOCs) are considered to be the main cause of air pollution and should be controlled strictly. Vacuum ultraviolet combined with cerium (Ce)-doped ZnO as the catalyst was investigated for the removal of para-xylene (p-xylene). Based on scanning electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction analysis, the particle size decreased after cerium in the form of Ce3+ and Ce4+ was doped into the ZnO crystal structure. An improved photocatalytic activity (higher p-xylene removal efficiency) was obtained at 0.96% Ce doping, 351 °C calcination temperature, and 339 min calcination duration. Based on the investigation of process parameters, the removal efficiency of p-xylene reached 100% with an initial concentration of 150 mg m−3, a relative humidity of 50%, and a residence time of 60 s. The ozone utilization extent was 96%, suggesting that the remaining ozone after the photocatalysis of p-xylene could be well controlled. Four different kinetic rate equations were used, suggesting that p-xylene and water molecules competed for the same active site. Mechanism analysis suggested that four types of oxidation contributed jointly to the removal of p-xylene and they followed this order: oxidation by the reactive species (RS, mainly ˙OH, O3 and O(1D)) > oxidation by the synergistic interactions among photolysis, RS and h+ > transformation by direct photolysis > oxidation by h+.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Yanju Chen,Zhi Liu,Shoujie Liu,Yuansheng Cheng,Chao Zhang,Jiqing Jiao,Yukun Lu,Wenhong Wang,Kaian Sun,Xiaolong Bi,Aiyan Han,Bin Liu,Yuan Pan,Yunqi Liu,Chenguang Liu
Developing catalysts with high activity and high atom utilization as well as exploring catalytic active sites are the biggest challenges for the electrocatalytic hydrodechlorination technology. Herein, a novel strategy of Pd crystal transformation induced by in-situ doping was proposed, and a series of amorphous Pd–P nanoparticles (NPs) with controllable coordination environment were synthesized successfully. The amorphous Pd–P NPs catalyst exhibits the highest activity for electrocatalytic hydrodechlorination and good cycling stability when the Pd–P coordination number is 3 and the Pd–Pd coordination number is 4. The 4-chlorophenol hydrodechlorination efficiency of Pd–P-60 NPs reaches 100 % within 2 h, and the mass activity is 8.58 min −1 g −1 , which is 5.57 times as high as that for crystalline Pd NPs catalyst. Theoretical calculation shows that Pd–P catalyst facilitates the desorption of phenol and weakens the toxic effect on active sites. Density of states indicate that the doping of P results in a downshift of d -band center, facilitating the desorption of phenol. This work discovers the crystal effect and coordination effect of amorphous Pd–P NPs for electrocatalytic hydrodechlorination, which lays an important theoretical foundation for the design and development of high-performance Pd-based catalysts for electrocatalytic hydrodechlorination.
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Minerals
·
2021
·Vol. 11
·期 2
·105
·
IF 2.644
Yifan Yang,Shiyong Tao,Zhichun Dong,Jing Xu,Xiang Zhang,Guoyan Pan
Because of the diversification of industries in developing cities, the phenomenon of the simultaneous contamination of various kinds of pollutants is becoming common, and the environmental process of pollutants in multi-contaminated environmental mediums has attracted attention in recent years. In this study,p-arsanilic acid (ASA), a kind of organic arsenic feed additive that contains the arsenic group in a chemical structure, is used as a typical contaminant to investigate its adsorption on iron oxides and its implication for contaminated soils. The adsorption kinetics on all solids can be fitted to the pseudo-second-order kinetic model well. At the same mass dosage conditions, the adsorption amount per unit surface area on iron oxides follows the order α-FeOOH > γ-Fe2O3> α-Fe2O3, which is significantly higher than that for actual soil, because of the lower content of iron oxides in actual soil. Lower pH conditions favor ASA adsorption, while higher pH conditions inhibit its adsorption as a result of the electrostatic repulsion and weakened hydrophobic interaction. The presence of phosphate also inhibits ASA adsorption because of the competitive effect. Correlations between the amount of ASA adsorption in actual soil and the Fe2O3content, total phosphorus content, arsenic content, and organic matter content of actual soil are also investigated in this work, and a moderate positive correlation (R2= 0.630), strong negative correlation (R2= 0.734), insignificant positive correlation (R2= 0.099), and no correlation (R2= 0.006) are found, respectively. These findings would help evaluate the potential hazard of the usage of organic arsenic feed additives, as well as further the understanding of the geochemical processes of contaminants in complicated mediums.Keywords:p-arsanilic acid;iron oxides;soil contamination;adsorption
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 7
·4083-4090
·
IF 11.301
Jin Liu,Xingcai Zhang,Qian Zhong,Jun Li,Hongzhang Wu,Bo Zhang,Lin Jin,Hua Bing Tao,Bin Liu
Semiconductor p–n junction engineering plays an indispensable role in developing highly efficient photocatalysts for energy conversion and environmental remediation. Herein, a novel AgI/Bi2Ga4O9 p–n junction photocatalyst is successfully constructed by an electrostatic self-assembly approach. Photoelectrochemical characterization together with density functional theory calculations shows that the formation of a p–n junction at the AgI/Bi2Ga4O9 interface favors separation and transfer of photogenerated charge carriers. The ˙O2− generated by 25%-AgI/Bi2Ga4O9 reaches a concentration of 18.8 μmol L−1 after 60 min of irradiation, which is 3.3 and 12.5 times higher than that generated by AgI and Bi2Ga4O9, providing 25%-AgI/Bi2Ga4O9 with greatly enhanced photocatalytic activity toward Acid Red 1 and metronidazole degradation. Our work provides a novel strategy for designing highly efficient photocatalysts for a wide range of energy and environmental applications.
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NANOTECHNOLOGY
·
2020
·Vol. 31
·期 43
·435706
·
IF 3.551
Wei Wei,Huihui Hu,Linlin Chen,Zaoxue Yan,Xuelin Fan,Junjie Wang,Yuanguo Xu,Jimin Xie
In this study, a nonaqueous method for the synthesis of size-controlled highly crystalline zinc ferrite/reduced graphene oxide (ZFO/rGO) aerogel was provided by using benzyl alcohol as the medium. In our findings, benzyl alcohol was introduced not only as the solvent, but the structure-directing agent and strong reducing agent during the nucleation and growth of ZnFe2O4 nanoparticles (NPs). The characterization analysis indicated that ZnFe2O4 NPs were immobilized on the multilayer rGO with a controllable size of 12 nm. Moreover, the 3D ZFO/rGO aerogel shows excellent electrochemical property as a facile electrochemical sensor for the detection of p-nitrophenol (p-NP). The ZFO/rGO electrochemical sensing offers the advantages of wide linear range (1–500 μmol l−1), excellent sensitivity (23.985 mA mM−1 cm−2), good stability and selectivity (<8.8%). In addition, the possible reaction mechanism of 3D ZFO/rGO aerogel was explained during the detection process under acidic condition. Significantly, our results not only provided insight into the possible reaction mechanism of 3D ZFO/rGO nanocomposite, but proposed the way for the synthesis of highly crystalline materials through a benzyl alcohol-mediated method.
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CELLULOSE
·
2020
·Vol. 27
·期 15
·9075-9089
·
IF 4.21
Chen Yu,Wang Dingfei,Liu Shidong,Lu Yonghua,Zhang Guangxian,Zhang Fengxiu
Abstract A novel P–N based, flame retardant ammonium salt of pentaethylenehexamine octa (methylene-phosphoric acid) (APHOMPA) was synthesized in this study. The structure of the prepared material flame retardant contains eight reactive ammonium phosphorus groups and was characterized by 1 H NMR, 13 C NMR, 31 P NMR, and (Fourier-transform infrared) FT-IR. The results showed that cotton fabrics finished with this flame retardant exhibited excellent flame retardancy and durability. The cotton fabrics finished with 30% APHOMPA solution had limiting oxygen index value 40.5%, and maintained 28.8% even after 50 laundering cycles. The FT-IR results showed that APHOMPA could be grafted on cellulose through P–O–C covalent bond. Vertical flammability, cone calorimetry, thermogravimetric (TG), and TG-IR results revealed the excellent flame retardancy of the finished cotton fabrics and suggested that the flame retardant mechanism of APHOMPA is a condensed phase process. Scanning electron microscopy results suggested the flame retardant entered the inner space of the cotton fabrics, and the X-ray diffraction results showed slight changes to the cotton crystal structure in the finishing process. The breaking strength, softness, and whiteness of finished cotton fabrics were sufficient, suggesting this retardant can be used to prepare treated cotton for multiple applications. Graphic abstract
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危险品化学品经营许可证（带存储）