NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 27
·13010-13020
·
IF 3.925
Jianke Tang,Yanfeng Xue,Chunlei Ma,Shengjian Zhang,Qiaoling Li
The construction of p–n heterojunctions instead of p-type or n-type semiconductors can improve the separation efficiency of photoinduced electrons and holes. In this work, BiOI/tetrapod-like ZnO whisker (T-ZnOw) p–n heterojunction photocatalysts with different Bi/Zn molar ratios were prepared by the in situ precipitation of BiOI on a T-ZnOw substrate. The BiOI/T-ZnOw photocatalysts efficiently degraded rhodamine B (RhB) and oxytetracycline (OTC) under visible light irradiation. The photocatalyst with a Bi/Zn molar ratio of 1 : 10 (BZ-10) exhibited the highest photocatalytic activity, with 97.1% and 88.0% removal of RhB and OTC, respectively. After degradation cycling experiments, the OTC removal efficiency was still 80.7%. The photocatalytic activity of the BZ-10 composite was improved compared to those of pure T-ZnOw and BiOI. This was attributed to the large specific surface area and the efficient separation of charge carriers caused by the formation of p–n heterojunctions between BiOI and T-ZnOw. The photodegradation mechanism was put forward based on radical trapping experiments and electron spin resonance (ESR) results. The synthesized BiOI/T-ZnOw heterojunction composite could be a promising photocatalyst in environmental photocatalysis.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 17
·6753-6764
·
IF 3.069
Qiannan Li,Yuguo Xia,Kangliang Wei,Xiaotong Ding,Shun Dong,Xiuling Jiao,Dairong Chen
Utilizing surface polarization to improve the separation efficiency of photoinduced carriers is considered to be an effective strategy to enhance the photocatalytic activity. Herein, a novel nonprecious metal-based P-doped g-C3N4 (PCN)/polyaniline (PANI)/BaTiO3 (BTO) (PPB) ternary photocatalyst with a hollow architecture was rationally designed and prepared by a combined wet-chemical and thermal treatment strategy. Except for the Z-scheme involved in PCN and PANI, the vertical polarization provided by ferroelectric BTO further improved the separation efficiency of the photoinduced charge carrier, resulting in an enhanced visible-light photocatalytic hydrogen production activity of 602 μmol h−1 g−1, which was 21-fold higher than that of pristine g-C3N4, and an apparent quantum efficiency of 4.16% at 420 nm. In addition, benefitting from this ternary heterojunction, the photoinduced electrons were concentrated on the intermediate p-type PANI while holes were left on the lateral n-type PCN involved in the Z-scheme, resulting in the retention of high oxidation–reduction potentials. Moreover, this approach to enhance the photocatalytic activity by constructing a Z-scheme heterojunction and surface polarization could expand to other photosystems, which provides a new avenue for the rational design and the synthesis of novel photocatalysts.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chenhui Yao,Yongqing Zhang,Meimei Du,Xiaodong Du,Shaobin Huang
Persistent organic pollutants (POPs) are widely distributed and have significant negative environmental impacts. Advanced oxidation processes (AOPs) based on sulfate radicals produced from persulfate (PS) have attracted considerable attention for the degradation of POPs, however, there are several disadvantages with these radical activation systems. This study examined the degradation of p -chloroaniline (PCA) by persulfate (PS) activated with activated carbon (AC). The effects of initial pH and dosage of AC were also investigated. Results showed that AC exhibits good catalytic activity toward PS. Increasing AC dosage significantly improved the PCA degradation rate but PCA removal was not obviously influenced by initial pH ranging from 3 to 9. PS activation in the PS/AC system was a non-radical process as demonstrated by (i) ethanol and tert -butyl alcohol having little effect on PCA removal and (ii) Electron Paramagnetic Resonance results showing no radicals signals in the PS/AC system. Results also demonstrated that TOC could be removed in PS oxidation and PCA dechlorination was rapid (in the initial 30 min). The three major intermediates identified during the PCA degradation in the non-radical oxidation process were N-(4-chloro-phenyl)-benzene-1,4-diamine, 4-chloro-phenyl-diazene and hydroquinone and two pathways of PCA degradation was proposed. This study proposes a new insights into the mechanism of PS activation by AC and an efficient method for POPs removal.
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高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2017
·Vol. 34
·期 3
·600-608
·
IF 2.007
Cui Yanhua,Meng Minjia,Sun Dongshu,Liu Yan,Pan Jianming,Dai Xiaohui,Yan Yongsheng
We developed a simple phase inversion technique to prepare molecularly imprinted membrane (MIM) at room temperature for membrane selective adsorption and separation of methyl p -hydroxybenzoate (M4HB). The prepared SMIP-MIM was characterized by SEM, FT-IR, TGA. Compared with non-imprinted membrane (NIM 1-5 ) adsorbent, SMIP-MIM 1-5 adsorbent with high specific surface area and showed higher binding capacity, faster kinetic and better selectively adsorption capacity for M4HB. The maximum isotherm adsorption capacity for M4HB of SMIP-MIM 4 was 3.519mg·g −1 , and the experimental data was well fitted to the slips model by multiple analysis. The maximum kinetic adsorption capacity and equilibrium adsorption time for SMIP-MIM 4 were 1.335mg·g −1 and 160 min, respectively. The mechanism for dynamic adsorption of M4HB onto SMIP-MIM 4 was found to follow pseudo-first-order model and pseudo-second-order model. Additionally, the permeability separation factor of SMIP-MIM 4 for M4HB compared to a structural analogues methyl 2-hydroxybenzoate (M2HB) could reach 2.847. The adsorption capacity of SMIP-MIM 4 for M4HB and M2HB was 0.549mg·cm −2 and 1.563mg·cm −2 , respectively. The adsorption behavior of M4HB through SMIP-MIM 4 followed the retarded permeation mechanism.
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高影响因子
RSC Advances
·
2015
·Vol. 5
·期 65
·52809-52816
·
IF 3.84
Hang Luo,Dou Zhang,Lu Wang,Chao Chen,Jing Zhou,Kechao Zhou
A sandwich-structured composite consisted of a pure poly(vinylidene fluoride-co-hexafluoropropylene) (P(VDF-HFP)) central layer and two BaTiO3–P(VDF-HFP) neighboring layers was developed for high energy storage density. The sandwiched structure effectively enhanced dielectric properties and energy storage capacity of the composites. Breakdown strength and energy storage density of the composite with 35 vol% P(VDF-HFP) central layer reached 315 kV mm−1 and 5.22 J cm−3, which were enhanced by 68% and 125% compared to 187 kV mm−1 and 2.32 J cm−3 of the single layer composite, respectively. The dielectric constant of the composites with sandwich-structure was approximately 3 times higher than the pure P(VDF-HFP) and the dielectric loss was as low as 0.026 at 1 kHz. These results demonstrated that the sandwich-structured ceramics/polymer composite was an effective way to produce high energy density composites.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Shuhui Liang,Manman He,Jingjing Guo,Jie Yue,Xipeng Pu,Bo Ge,Wenzhi Li
The BiOBr:Yb 3+ ,Er 3+ /g-C 3 N 4 (BYE/CN) p-n junction photocatalysts were successfully fabricated by a stepwise method. Experimental results show that Er 3+ /Yb 3+ were successfully doped into BiOBr lattice. As-obtained BYE/CN exhibited strong NIR light absorption and upconversion emission from NIR to UV–visible due to the upconversion transition of Er 3+ . The p-n junction was constructed due to the appropriate alignment band structure of BYE and g-C 3 N 4 , which distinctly suppresses the recombination rate of electron-hole pairs. Compared with pure BYE and CN, as-synthesized BYE/CN samples exhibit distinctly improved photoactivities under the irradiation of visible or NIR light, which can be attributed to the upconversion effect of Er 3+ and the construction of p-n junction. This result may provides a promising system for efficient harvest of the NIR light, which will contribute to the utilization of solar energy in the future.
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高影响因子
RSC Advances
·
2017
·Vol. 7
·期 50
·31663-31670
·
IF 3.108
Hong Wang,Taotao Jiang,Lei Ma,Hanbing Wang,Xiaoliang Xu,Chunshan Lu,Xiaonian Li
In this study, we found that the phenylhydroxylamine intermediate could desorb more easily from an Ir surface than from a Pt surface, which is beneficial for inhibiting the over-hydrogenation of phenylhydroxylamine to aniline. On the other hand, the Brφnsted acid functionalized ionic liquids with sulfonic acid and bisulfate anions were acidic enough to catalyze the Bamberger rearrangement to form p-aminophenol from phenylhydroxylamine. On this basis, a new catalytic system constructed by Ir/C and Brφnsted acid functionalized ionic liquid was applied, for the first time, to the one-pot hydrogenation of nitrobenzene to p-aminophenol. Our results indicate that the PAP selectivity of Ir/C and [SO3H-bmim][HSO4] Brφnsted functionalized ionic liquid was far more than that of the traditional Pt/C and sulfuric acid catalyst system. Furthermore, the dually functionalized ionic liquid ([HSO3-b-N-Bu3][HSO4]) can be used simultaneously as an acid catalyst and also as a surfactant, due to its higher lipophilicity. Therefore, our new catalytic system has unique advantages in the hydrogenation of nitrobenzene to p-aminophenol.
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高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Song Liu,Xiang Ke,Yingying Zhou,Shimei Xu,Yiqian Wu,Yu Kuang,Keyan Zeng,Rengui Xiao
Organic electrode materials have poor long-cycle performance in dual-ion batteries due to high solubility and low electronic conductivity, which limits its practical application in secondary batteries. In this work, p-type polyaniline (PANI) and n-type polyimide (PI) are used to fabricate composite organic anode materials (PANI@PI). Owing to the differences in reaction mechanisms between PANI and PI materials, the anode of the constructed dual-ion battery could react with both anions and cations simultaneously, resulting in the convergence of the two redox potentials formed by PANI and PI during the process of charging and discharging. This triggers a synergistic effect of electrode reactions in the composite material, improving the long-cycle performance of organic dual-ion batteries. The experimental results show that PANI@PI/EMImTFSI/NG battery has ultra-long-cycle performance. The discharge capacity retention rate is 51.85 % of the maximum capacity (86.64 mAh g −1 ) after 28,000 cycles at 2C. Through the analysis of the structure of composite materials and the kinetics of electrode reactions, it is found that PANI materials gradually activate their electrochemical activity during charging and discharging due to the removal of doping ions. This excitation process synergistically promotes the electrochemical reaction of PI, thus improving the cyclic performance of PANI@PI composite anode materials.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Yijin Shu,Jun Qi,Huanxi Liao,Zeshen Deng,Yongtai He,Lichun Yang
Metal phosphides are promising high-capacity anode materials for lithium-ion batteries (LIBs), yet their practical application is limited by capacity degradation and sluggish reaction kinetics. Here, we develop a plasma-assisted ball milling strategy to synthesize amorphous Sn 4 P 3 -phosphorus composites encapsulated in few-layer graphene (Sn 4 P 3 -P@FLG). This method simultaneously achieves in-situ decomposition of SnP 3 into Sn 4 P 3 and phosphorus and exfoliates expanded graphite into ultrathin FLG (3∼5 layers). The FLG coating enhances electronic conductivity and accommodates volume variations, while the phosphorus matrix suppresses Sn coarsening, collectively ensuring stable conversion reversibility. The optimized Sn 4 P 3 -P@FLG delivers an impressive initial reversible capacity of 1356.2 mAh g -1 at 0.1 A g -1 , with coulombic efficiency of 89.1 %. It exhibits exceptional long-term cyclability 1 A g -1 , retaining 92 % capacity (1125.8 mAh g -1 ) after 400 cycles. Furthermore, a full cell paired with commercial LiFePO 4 maintains 86.1 % capacity (882.4 mAh g -1 ) after 150 cycles at 1 A g -1 , demonstrating practical viability. The high electrochemical performance demonstrates the potential of Sn 4 P 3 -P@FLG as a promising anode material for LIBs.
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高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 40
·21650-21658
·
IF 14.511
Yu Cheng,Zhongbin Pan,Hanxi Chen,Xiangping Ding,Zhicheng Li,Xu Fan,Jinjun Liu,Peng Li,Jinhong Yu,Jiwei Zhai
High-performance flexible dielectric capacitors have a decisive effect in advanced electronics and electrical power systems. Nevertheless, the discharge energy density (Ud) of dielectric capacitors is bounded by their weak breakdown strength (Eb) and low dielectric constant (K). In this work, mediate dielectric constant one-dimensional hydroxyapatite nanowires (HAP NWs) were synthesized and applied in poly(vinylidene fluoride-co-hexafluoropropene)-based (P(VDF–HFP)) nanocomposites for energy storage application. To mitigate electric field distortion and suppress free charge migration in nanocomposites, Al2O3 was insulated as an interfacial layer incorporated between 1D HAP NWs and polymer matrices, which were identified via phase field simulations and experimental results. Accordingly, P(VDF–HFP)/HAP@Al2O3 NWs composite films exhibit an excellent Ud of ∼27.6 J cm−3 accompanied by a high charging/discharging efficiency (η) of ∼72.9% at 650 MV m−1, which is ∼190% over neat P(VDF–HFP) (∼9.5 J cm−3 at 500 MV m−1) and ∼2200% improvements of bench-mark biaxially oriented polypropylene (∼1.2 J cm−3 at 650 MV m−1). This research offers a paradigmatic design to polymer-based composite films with high Ud and η for application in dielectric capacitors.
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高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 10
·6538-6546
·
IF 12.732
Meng Zhang,Lu Wang,Bin Wang,Bo Zhang,Xiuping Sun,Debao Wang,Zhen Kong,Liqiang Xu
Lithium–sulfur batteries have attracted increasing attention in the field of energy storage due to their advantages of high specific energy and energy density. However, there are still many difficulties in the practical application of lithium–sulfur batteries, such as large volume expansion of sulfur and shuttle effect of polysulfides, which led to rapid capacity attenuation and poor cycling performance. To address these problems, herein, nanosized phosphorus-modified Fe4N supported by nitrogen, phosphorus co-doped graphene nanosheets (P-Fe4N@NPG) has been synthesized by a simple solvothermal method combined with subsequent nitriding and phosphating calcination, and then used as a sulfur host for lithium–sulfur batteries. Benefiting from the high electrical conductivity, multiple composition and unique structure, the obtained P-Fe4N@NPG/S cathode exhibits excellent electrochemical performances: the cathode presents a high initial specific capacity of 1386.1 mA h g−1 at 0.1C, distinct cycling performance (417.4 mA h g−1 at 1C after 1000 cycles) and excellent rate performance with a sulfur loading of 73 wt%. Even if the sulfur loading increases as high as 3.52 and 5.65 mg cm−2, the cathode still displays an excellent rate performance and outstanding areal capacity of 6.03 mA h cm−2, respectively. These results indicate that our design of P-Fe4N@NPG is a great development in the application of sulfur hosts for lithium–sulfur batteries.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Wenxuan Wu,Peiwen Zhu,Liping Luo,Hongyan Lin,Yuheng Tao,Lingyu Ruan,Liqun Wang,Qing Qing
Deep eutectic solvent (DES) is a newly-emerged green solvent for efficient pretreatment of lignocellulosic feedstock. To improve the component fractionation performance of neutral DES , p- toluenesulfonic acid ( p- TsOH) was employed as catalyst to form a novel ternary DES with benzyltriethylammonium chloride (TEBAC) and glycerol (Gly) for pretreatment of soybean straw. Under the optimum reaction conditions (TEBAC:Gly = 1:12, 1.6 wt% p- TsOH and reacted at 90 °C for 160 min), the lignin and hemicellulose removal from soybean straw were amounted to 92.0 % and 88.2 %, respectively. The pretreated substrate showed satisfactory enzymatic hydrolysis performance, as the glucose and reducing sugar concentrations reached 37.3 g/L and 42.3 g/L, respectively, after 72 h saccharification under the action of cellulase with a relatively low enzyme loading of 10 FPU/g cellulose. This method provides an efficient and mild route for utilization of agricultural waste and production of platform monosaccharides.
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DOI
PubMed
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