CHEMOSPHERE
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2020
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IF 5.778
Ren He,Kehui Xue,Jing Wang,Ying Yan,Yi Peng,Tianli Yang,Yunchu Hu,Wenlei Wang
The direct shedding of piperazine rings is critical for the degradation of antibiotic persistent organic pollutants. In this work, nitrogen-deficient g-C 3 N 4 loaded with polyoxometalates porous photocatalysts with P–N heterojunctions were carried out through the formation of chemical bonds between the nitrogen-deficient C + in g-C 3 N x and the bridging oxygen in polyoxometalates (POMs), including phosphomolybdic acid (PMA), phosphotungstic acid (PTA) and silicotungstic acid (STA). The adsorption and photocatalysis experiments confirm the ability of the g-C 3 N x /POMs nanosheets to efficiently remove ciprofloxacin via the synergistic effects of adsorption and photo-catalysis. Approximately, g-C 3 N x /POMs-30 exhibits the optimal degradation ability, and the degradation rates of g-C 3 N x /PMA-30, g-C 3 N x /PTA-30 and g-C 3 N x /STA-30 could respectively reach 93.1%, 97.4% and 95.6% within only 5 min under visible light. The free radical scavenging experiment and ESR free radical capture experiments confirm that ·OH and ·O 2 − are free radicals that effectively degrade CIP. According to the results of the LC-MS analysis, the intermediates produced after CIP degradation and the efficient degradation pathway are proposed. The direct shedding of piperazine rings in the decarboxylation and defluorination process leads to the most efficient degradation of CIP into the small molecules.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Tan Dang,Guiqing Zhang,Qinggang Li,Zuoying Cao,Guanhua Zhang,Huigao Duan
Nanohybrid-type Ni-Co-phosphide/C (Ni-Co-P/C) hollow microflowers with ultrathin nanosheets (HUNs) are constructed through a modified ethylene glycol-mediated self-assembly process and further phosphating treatment. The peculiar structure can availably provide affluent mass transfer channels and active sites, meanwhile inhibit the aggregation of nanosheets. The synergistic effects of the produced Ni-Co-P/C are demonstrated systematically through regulating the initial Ni/Co ratio. A remarkable specific capacity of 205 mAh g −1 can be achieved at 1 A g −1 , and the optimized Ni 1 -Co 2 -P/C (referred to as NiCoP/CoP/C) still holds a superior rate capability with a capacity retention of 71% even at 50 A g −1 . Notably, the electrode also reveals an attractive capacity of 133 mAh g −1 with a high mass loading of 9.1 mg cm −2 . A hybrid supercapacitor assembled with Ni 1 -Co 2 -P/C cathode and N -doped porous carbon anode demonstrates outstanding electrochemical performance, such as a high energy density (43 Wh kg −1 at a power density of 818 W kg −1 ) and excellent stability (90% retention after 20,000 cycles at 12 A g −1 ). The facile fabrication process and attractive performance make Ni 1 -Co 2 -P/C HUNs promising in energy storage applications.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 9
·4931-4937
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IF 11.301
Zhiwei Huang,Dongyang Wang,Caiyun Li,Jinfeng Wang,Guangtao Wang,Li-Dong Zhao
In this work, the thermoelectric performance of p-type PbSe was improved dramatically by enhancing the Seebeck coefficient and reducing electronic thermal conductivity through CdTe alloying. CdTe alloying effectively increased the effective mass of p-type Pb0.98Na0.02Se due to band flattening and promoting the valence band convergence, which contributed to a high Seebeck coefficient of ∼238 μV K−1 at 860 K and large power factor of ∼18.2 μW cm−1 K−2 at 860 K for Pb0.98Na0.02Se + 4% CdTe. Furthermore, CdTe alloying reduced the carrier mobility of Pb0.98Na0.02Se due to the enhanced scattering of impurity atoms, which results in a remarkable reduction of electronic thermal conductivity. As a result, due to its higher power factor and lower thermal conductivity, a high thermoelectric figure of merit ZT ∼1.5 at 860 K was achieved for Pb0.98Na0.02Se + 4% CdTe. This paper provides one novel approach to enhance the thermoelectric performance of p-type PbSe through synergistically manipulating electrical and thermal transport properties.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Lei Chen,Jin-Tao Ren,Zhong-Yong Yuan
The modification of electronic structure in heterogeneous catalysts has been particularly proven as one of efficient approaches for enhancing the catalytic performances in redox. Herein, phosphorus-doped g-C 3 N 4 nanosheets with atomically dispersed V-based nanocomposites (V/P-CN) were fabricated through a facile organophosphonic acid-modified co-condensation route. The use of organophosphonic acid not only achieves the in-situ P-doping but also tailors the texture of the synthesized V/P-CN, leading to narrow band gap, electron-enriched structure, nanosheet morphology, abundant mesh-like pores and enlarged surface area. Series of physicochemical and electrochemical characterizations indicate the enhanced electron transfer from the P-doped g-C 3 N 4 to V-based nanocomposites. The heterojunction-induced electron–enriched structure of V-based nanocomposites in V/P-CN endows with the impressive intrinsic oxidative desulfurization activities. Radical scavenger experiment further suggests the significant electron interaction in the heterojunction catalysts favors the enriched electron dispersion around V-based active species and employs as rate-determining step for oxidative desulfurization. This work offers a facile but economic and powerful method to modulate the structure of the heterojunction catalysts for green catalysis, especially redox reactions.
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Nano Energy
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2020
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IF 16.602
Xiaoyang Guan,Bingang Xu,Jianliang Gong
Flexible piezoelectric nanogenerators (FPENGs) have attracted a great attention owing to their promising applications in harvesting mechanical energy and driving portable devices. To develop high-performance FPENGs, the significant relationship among material, structure and performance inspired us a rational design of FPENGs from Pdop-BaTiO 3 @P(VDF-TrFE) nanocomposite fiber mats with a hierarchically architected microstructure. In contrast with previous approaches, the polydopamine (Pdop) modified barium titanate (BaTiO 3 , BT) nanoparticles have been anchored onto the surface of electrospun poly (vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) fibers to fabricate hierarchical micro-structured membrane in this study, which not only effectively avoids the agglomeration of nanofillers but also enhances the density of interfaces in the nanocomposites. As a result, the as-fabricated FPENGs show a significantly enhanced output of 6 V and 1.5 μA as compared to the PENG with only P(VDF-TrFE) membrane (1.25 V and 0.6 μA). Furthermore, output voltage of the new FPENGs is 40%–68% higher than that of composite membranes with nanoparticles at the interior of nanofibers . The improved output of the PENG is attributed to the high density of interfaces in the hierarchical microstructure and the corresponding enhancement of dielectric response. Then, electric performance of FPENGs was investigated in terms of force, frequency and load resistance. Finally, the FPENG was employed to efficiently detect human body movements as self-powered sensors. The hierarchical nanocomposite membrane designed in this study provides an effective approach for developing mechanical energy harvesters , wearable sensor network and self-powered devices.
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COLLOIDS AND SURFACES B-BIOINTERFACES
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2021
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IF 5.268
Shaochun Su,Long Chen,Li Hao,Huayao Chen,Xinhua Zhou,Hongjun Zhou
Avermectin (AVM) is a biopesticide with low toxicity and high activity, but has limited use due to its poor water solubility and easy decomposition. A delivery system that can stabilize this biopesticide can play a significant role for improving its biological activity. Herein, water-dispersible functionalized polysuccinimide nanoparticles (PAD) were prepared by a ring-opening reaction and subsequently used to encapsulate AVM via self-assembly to form AVM@PAD nanoparticles with a loading ratio of 10.04 %. The half-life under UV radiation (300 W) of AVM@PAD was three times higher than that of free AVM, demonstrating the excellent protective ability of PAD. In addition, AVM@PAD nanoparticles could sustain the release of AVM for 70 h with a cumulative release rate of 70 %. AVM@PAD nanoparticles also showed a pH-responsive release, and their maximum cumulative release rate was at neutral pH. Moreover, the median lethal concentration ( LC 50 ) value of AVM@PAD with respect to Plutella xylostella was 34.50 mg/L, while that of free AVM was 56.05 mg/L. These results showed that the AVM@PAD nanoparticles can potentially and effectively promote drug stability and biological activity in agriculture.
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APPLIED SURFACE SCIENCE
·
2021
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IF 6.707
Chuanxin Yu,Mingxia Li,Decai Yang,Kai Pan,Fan Yang,Yachao Xu,Lang Yuan,Yang Qu,Wei Zhou
The low charge separation efficiency of semiconductor photocatalyst is still a stumbling block to improve photocatalytic performance. The p-n heterojunction with built-in electric field usually favors the spatial charge separation. Herein, NiO nanoparticles dotted TiO 2 nanotubes p-n heterojunction photocatalysts (NiO/TNs) are fabricated through hydrothermal and wet-impregnation strategies. The resultant NiO/TNs with relatively large surface area of 102.8 m 2 g −1 shows excellent photocatalytic H 2 production rate of 228 μmol h −1 g −1 , which are four times higher than that of TNs (50 μmol h −1 g −1 ) under AM 1.5G irradiation without any cocatalyst. The high photocatalytic activity can be ascribed to the uniform growth NiO nanoparticles on surface of TNs enhancing the photoresponse to visible light region, and the formation of p-n heterojunctions induced built-in electric field promoting photogenerated electrons transmission from NiO to TNs through the heterogeneous interface, thus enhanced the charge carriers migration and separation efficiently.
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Materials Today Sustainability
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2021
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IF 4.524
D. Zheng,C. Lv,X. Zhang,S. Chen,H. Liu,Y. Sun,X. She,D. Li,D. Yang
Developing cost-effective electrocatalysts with efficient activity and superior stability for hydrogen evolution reaction (HER) over a wide pH range is highly desirable and remains a significant challenge. Herein, we report CoP supported RuP 3 nanosheet (RuP 3 –CoP NS) HER electrocatalysts through an ice-templating method. Constructing heterojunctions of RuP 3 and CoP can reduce the loading of scarce Ru species in the catalyst, and meanwhile, maintain efficient HER activity over a wide pH range. The RuP 3 –CoP NS catalyst with only about 15 wt.% loading of Ru species exhibits remarkable HER performance with excellent catalytic stability and low overpotentials of 25, 60, and 81 mV at 10 mA/cm 2 in alkaline, acidic, and neutral media, respectively. The density functional theory calculations indicated that the RuP 3 could induce boosting the catalytic activity of P sites in CoP. The enhancement of the HER performance can be attributed to the electron transfer from RuP 3 to the P sites in CoP, which changes its electronic structure, and thus, optimizing the adsorption strength of H ∗ .
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 8
·2443-2454
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IF 2.647
Liu Xiaopeng,Liu Yan,Wang Yun,Yuan Dingzhong,Wang Changfu,Liu Jinbiao
In this paper, polyphosphazene was synthesized as precursors using benzene-1,4-diboronic acid and hexachlorocyclotriphosphazene (HCCP) by a simple one-step ultrasonic method. Furthermore, B, N, and P co-doped carbon materials containing phosphate functional groups (denoted as BNPCs-PO 4 ) was obtained by the carbonization and functionalization of precursors at high temperature. Through the structural characterization and the investigation of electrochemical and electrosorption properties, it can be proved that BNPCs-PO 4 has excellent porous structure and electrosorption properties with the maximum electrosorption capacity of 750 ± 40 mg/g for U(VI) and the equilibrium time of 24 min. The optimal pH and applied potential for electrosorption were 5.0 and 0.9 V, respectively. Meanwhile, it also showed high selectivity under the coexistence of multiple metal ions and excellent recyclability after six cycles. The results showed the introduction of heteroatoms improved the electrosorption properties of carbon materials and BNPCs-PO 4 can be utilized as electrode for the removal of U(VI) in aqueous solution.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yuxiao Gao,Ying Zhao,Hongru Liu,Mingyu Shao,Zhi Chen,Tianyi Ma,Zexing Wu,Lei Wang
Developing efficient and cost-effective catalysts for hydrogen evolution reaction (HER) is vital to hydrogen energy's commercial applications. In this study, N,P-doped carbon supported ruthenium (Ru) doped triruthenium tetraphosphide (Re 3 P 4 ) (Ru-Re 3 P 4 /NPC) with porous nanostructure is prepared using the low-toxic melamine phosphate as the carbon and phosphorous source. The in-situ generated N,P-doped carbon layers play a pivotal role in regulating the electrocatalytic activity by avoiding the aggregation of the nanoparticles and increasing the specific surface area. Moreover, Ru doping contributes to the remarkable electrocatalytic performance of the prepared nanomaterials. Impressively, the as-synthesized Ru-Re 3 P 4 /NPC presents remarkable electrocatalytic performances toward HER with small overpotentials of 39 mV, 115 mV, and 88 mV to deliver 10 mA cm −2 in alkaline, neutral, and acidic media. Moreover, the prepared electrocatalyst can drive water-splitting with a small potential of 1.45 V@10 mA cm −2 and use sustainable energies, including solar, wind, and thermal, as electric resources. This work paves a novel and valuable way to enhance the electrocatalytic performances of metal phosphides.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2019
·
IF 3.973
Qian Zhang,Haifeng Yang,Benazir Sahito,Xinyu Li,Lin Peng,Xiuge Gao,Hui Ji,Liping Wang,Shanxiang Jiang,Dawei Guo
Tilmicosin (TMS) is widely applied to treat porcine bacterial respiratory diseases in veterinary medicine. However, oral administration of TMS is greatly limited due to its physicochemical properties, such as poor water solubility, gastric acid sensitivity and bitterness. Therefore, nanostructured lipid carriers (NLCs) were developed as an oral delivery system for TMS by the high shear method combined with ultrasonic techniques in this study. The results showed that TMS-NLCs were approximately spherical with a hydrodynamic diameter of 283.03 nm and a zeta potential of -30.04 mV. TMS was almost entirely encapsulated in the NLCs by interacting with the lipid matrix, as characterized by differential scanning calorimetry and fourier transform infrared spectroscopy. Thus, TMS-NLCs had an excellent encapsulation efficiency and loading capacity with values of 93.46% and 9.23%, respectively. TMS-NLCs maintained good stability not only during storage at 4 ℃, 25 ℃ and 40 ℃ for 90 days but also in stimulated gastrointestinal (GI) fluids at 37 ℃ for 7 days. Therefore, TMS-NLCs displayed low and sustained release in vitro without an initial burst release in stimulated GI fluids. Furthermore, TMS-NLCs showed higher oral bioavailability in piglets compared to the API suspension. Subsequently, Caco-2 cell monolayers were utilized to analyze the mechanism of NLC-enhanced oral adsorption of TMS. The data revealed that NLCs not only increased cellular uptake of TMS but also inhibited the efflux of P-gp in Caco-2 cells. Additionally, TMS-NLCs mainly entered Caco-2 cells via the caveolae/lipid raft-mediated endocytosis pathway. Moreover, nanoparticles were transported across Caco-2 cell monolayers in the intact form to the basolateral side, as identified by transmission electron microscopy, indicating that TMS-NLCs escape lysosome degradation. Taken together, these results indicate that NLCs are a potential delivery carrier for improving the solubility, permeability and oral bioavailability of TMS.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jingzhen Wang,Chunshuai Cao,Yuanyuan Wang,Yingnan Wang,Binbin Sun,Lingyan Zhu
The strong persistence, wide presence and potential toxicities of perfluorooctanoic acid (PFOA) in aquatic environment makes it a challenge to develop advanced technologies to eliminate it from water. In this study, novel BiOI@Bi 5 O 7 I p-n heterojunction photocatalysts were facilely prepared by calcinating BiOI at 350 °C < T < 410 °C. Under simulated solar light irradiation, the degradation rate constant ( k = 0.247 h −1 ) of PFOA by the BiOI@Bi 5 O 7 I heterojunction prepared at 390 °C (T-390) was four times of that by pristine BiOI ( k = 0.061 h −1 ) and 1.2 times of that by Bi 5 O 7 I (prepared at 410 °C, k = 0.206 h −1 ). T-390 also exhibited excellent mineralization efficiency by removing about 60% of total organic carbon in 6 h of irradiation. The significantly enhanced photocatalytic activity of BiOI@Bi 5 O 7 I composite was mainly attributed by the unique band gap structure of the p-n heterojunction, which enhanced the visible-light absorbance and accelerated the separation of photogenerated charge carriers. The generated intermediate products were analyzed by ultra-performance liquid chromatography-mass spectrometry, and the results indicated that PFOA was decomposed by stepwise losing CF 2 units. The BiOI@Bi 5 O 7 I heterojunction also possessed very good durability and reusability, displaying a great potential in PFOA containing water treatment.
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