Advanced Materials Interfaces
·
2021
·Vol. 8
·期 17
·2100889
·
IF 6.147
Yeguang Zhang,Yong Qi,Shufen Zhang
Due to its high refractive index, photocatalytic activity, and photoinduced superhydrophilicity, TiO 2 has advantages in photonic crystals (PCs). However, the composite of TiO 2 and PCs needs to be calcined at high temperatures, and the structural stability of the composites is poor. In this study, photoinduced superhydrophilic TiO 2 –poly(hydroxyethyl acrylate)/polystyrene (PHEA/PS) PC composites with strong structural colors and self-cleaning are fabricated by coating triethanolamine-modified anatase TiO 2 nanoparticles-hydroxyethyl acrylate on the surface of PS PCs. The ordered arrays can be retained after the superficial layers of PS PCs are filled with TiO 2 –PHEA, and vivid blue, green, and red composites can be obtained. The water contact angles of the composites can be reduced to 3° in 0.4 s, and superhydrophilicity can be maintained for 180 days in a laboratory environment. The declining superhydrophilicity can be restored under UV irradiation. The composites can degrade the adsorbed methylene blue under UV irradiation. Photocatalytic activity and superhydrophilicity impart self-cleaning ability on the composites. The locking of PS arrays by TiO 2 –PHEA enhances the structural stability of the composites, making them resistant to water soaking and washing. Therefore, the composites show prospects for decoration, fabric coloring, and wearable electronic devices.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Cong Wang,Shaoyi Jia,Yongchao Zhang,Yao Nian,Yan Wang,You Han,Yong Liu,Haitao Ren,Songhai Wu,Kexin Yao,Xu Han
SO 4 − and OH radicals are important oxidative species that play important roles in the oxidation of organic contaminants by peroxomonosulfate (PMS)/persulfate (PS) and Co 3 O 4 under acidic conditions. However, the facet effect of Co 3 O 4 on the catalytic oxidation of phenol by PS under alkaline conditions has not been investigated yet. In this study, we synthesized three Co 3 O 4 nanoparticles with different facets [rod (110), cube (100) and octahedra (111)]. The Co 3 O 4 rods show the highest catalytic reactivity in the oxidation of phenol by PS, followed by Co 3 O 4 cubes and Co 3 O 4 octahedra. Quenching experiments and EPR analysis rule out contributions of SO 4 − , OH, O 2 − and 1 O 2 to phenol oxidation and suggest that H-abstraction from phenol to phenoxyl radicals is an important pathway in all Co 3 O 4 -PS systems. The analysis of total organic carbon (TOC) and solid characterizations reveal that more than 96.6 % phenol has been transformed into polyphenols, instead of being mineralized into smaller organic molecules or CO 2 in the rod-PS-phenol system. The DFT (density functional theory) calculations further confirm that PS is more readily activated via a non-radical pathway on the Co 3 O 4 (110) plane with appropriate Co(II)-Co(II) distances, and the activated O O bonds then abstract H atoms from phenol molecules with the production of phenoxyl radicals, as well as SO 4 − and OH radicals. The produced phenoxyl radicals then link together to form dimers, trimers, oligomers and eventually insoluble polymers. This study not only enriches our understanding on the facet effect of different Co 3 O 4 in the oxidation of phenol, but also gives new insight into turning phenolic wastes into polyphenol "treasures".
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Shenyu Lan,Yanxi Chen,Lixi Zeng,Haodong Ji,Wen Liu,Mingshan Zhu
Piezoelectricity, as a kind of physical phenomenon, is a coupling between a material’s mechanical and electrical behavior. Herein, the local accumulated charges on the surface of piezoelectric material were used to break O O bond of peroxymonosulfate (PMS) to induce its activation for the benzothiazole (BTH) removal. Taking BaTiO 3 as a model piezocatalyst, up to 97 % of BTH was degraded within 30 min in BaTiO 3 /PMS/force system, which was respective 40 %, 79 %, 83 % higher than that in BaTiO 3 /force piezocatalysis, force/PMS oxidation, and BaTiO 3 /PMS adsorption. A significant synergistic effect was observed since the reaction rate constant of BaTiO 3 /PMS/force was 3 times higher than the sum of those later three processes. The possible activated mechanism was proposed based on reactive species analysis, DFT calculation and LCMS determination. The stability of the piezocatalyst and the treatment performance for real wastewater were studied to investigate the potential in practical applicability. All the results demonstrated that the BaTiO 3 piezoelectricity can efficiently activate PMS to enhance BTH removal, which is a promising strategy for PMS activation, as well as a valuable insight for the piezoelectrical application in wastewater remediation.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Small Methods
·
2023
·
IF 12.4
Chunlai Song,Qiang Wang,Ruihang Wen,Qiben Tang,Zhiqiang Luo,Zhihao Yuan
Benzoquinone (BQ) is considered to be a desirable cathode material for aqueous zinc-based batteries. The major limitations of BQ electrode are the severe sublimation and poor electrical conductivity, which results in serious mass loss during electrode preparation and inferior rate performance. In this study, iodine (I 2 ) species are utilized as an efficient catalyst for the highly reversible conversion of BQ/BQ 2− couple in the Zn-BQ battery system, wherein N-doped porous carbon is employed as a host material for anchoring the BQ molecule. In the combination electrode (denoted as BQ-I@NPC) with 1wt% I 2 additive where I 2 can serve as a carrier to accelerates the Zn 2+ transmission, and reduce the voltage hysteresis of the electrode. As a result, the BQ-I@NPC cathode delivers a high specific capacity of ≈482 mAh g −1 at 0.25 A g −1 , realizing a high energy density of 545 Wh kg −1 (based on BQ), which is the highest values among reported organic cathode materials for aqueous Zn-based batteries. Also, a high BQ loading (8 mg cm −2 ) can be attained, and achieving a superior cycling stability with a capacity retention of ≈80% after 20,000 times at 10 C. The work proposes an effective approach toward high performance organic electrode materials.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
PubMed
高影响因子
Environmental Science-Nano
·
2023
·Vol. 11
·期 1
·309-323
·
IF 7.3
Xin Liu,Xiang He,Zhi-Cheng Ma,Xi Xi,Shuang-Xi Wang
Organic ammonium salts which are formed from heterogeneous reactions are one of the important components of nitrogen-containing organic compounds (NOCs) in the atmosphere. In order to investigate the formation process of organic ammonium salts, a gas-flow system with the diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) technique was applied to monitor the influence of a simulated illumination on the heterogeneous reactions of toluene/O3/NH3 on hematite nanoparticles. The results revealed that toluene was transformed into benzoic acid under the action of oxidants (O3 and OH radicals). The carboxylic acid was neutralized with NH3 to form ammonium benzoate. The effect of light intensities on the reaction kinetics of ammonium benzoate formation from the heterogeneous reactions was also analyzed. With an increase in the light intensity from dark to 36 mW cm−2, the reaction rates increased from (1.20 ± 0.02) × 1018 ions per g s−1 to (2.30 ± 0.09) × 1018 ions per g s−1. This induced the formation of abundant active radicals, which accelerated the conversion of toluene to ammonium benzoate on hematite nanoparticles. However, the reaction rates decreased to (1.80 ± 0.03) × 1018 ions per g s−1 as the light intensity continued to increase to 100 mW cm−2. The yield of organic ammonium salts might be reduced owing to the volatilization of ammonium benzoate at a high light intensity. Meanwhile, the initial uptake coefficient showed a similar change trend. The values of the uptake coefficient increased by 81.1% when the light intensity increased from 0 mW cm−2 to 36 mW cm−2 but decreased by 21.1% when the light intensity increased from 36 mW cm−2 to 100 mW cm−2. Our results not only propose the heterogeneous reaction kinetics of toluene/O3/NH3 on the nanoscale hematite surface under different light intensity conditions, but also provide a theoretical support for further understanding the conversion process of volatile organic compounds (VOCs) under combined atmospheric pollution.
研究领域:
大气化学
·
环境科学
✓ 已验证
DOI
高影响因子
BMC PLANT BIOLOGY
·
2023
·Vol. 23
·期 1
·1-14
·
IF 5.3
Li Guohui,Song Cheng,Manzoor Muhammad Aamir,Li Daoyuan,Cao Yunpeng,Cai Yongping
Background The enzyme phenylalanine ammonia lyase (PAL) controls the transition from primary to secondary metabolism by converting L-phenylalanine (L-Phe) to cinnamic acid. However, the function of PAL in pear plants ( Pyrus bretschneideri ) has not yet been fully elucidated. Results We identified three PAL genes ( PbPAL1 , PbPAL2 and PbPAL3 ) from the pear genome by exploring pear genome databases. The evolutionary tree revealed that three PbPAL s were classified into one group. We expressed PbPAL1 and PbPAL2 recombinant proteins, and the purified PbPAL1 and PbPAL2 proteins showed strict substrate specificity for L-Phe, no activity toward L-Tyr in vitro, and modest changes in kinetics and enzyme characteristics. Furthermore, overexpression of PbAL1 and PbPAL1 -RNAi, respectively, and resulted in significant changes in stone cell and lignin contents in pear fruits. The results of yeast one-hybrid (Y1H) assays that PbWLIM1 could bind to the conserved PAL box in the PbPAL promoter and regulate the transcription level of PbPAL2. Conclusions Our findings not only showed PbPAL’s potential role in lignin biosynthesis but also laid the foundation for future studies on the regulation of lignin synthesis and stone cell development in pear fruit utilizing molecular biology approaches.
研究领域:
植物学
·
分子生物学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Xin Xiao,Chunxia Zheng,Mingli Lu,Ling Zhang,Fei Liu,Xiaoxi Zuo,Junmin Nan
The selective oxidation of benzyl alcohol (BA) into benzaldehyde (BAD) is an attractive model reaction for organic synthesis. Using a microwave-calcination route, a novel flower-like Bi 24 O 31 Br 10 with surface oxygen vacancies and bromine vacancies was successfully synthesized. In the construction of Bi 24 O 31 Br 10 , glucose acts as a complexing, reducing, and structure-directing agent. The as-synthesized Bi 24 O 31 Br 10 exhibits excellent activity for the photocatalytic aerobic oxidation of BA into BAD, with >99% conversion and >99% selectivity under blue LED irradiation at ambient conditions, which is 3.3-, 4.7-, and 27.8-fold higher than that of TiO 2 , Bi 4 O 5 Br 2 , and Bi 12 O 17 Cl 2 , respectively. The high selectivity is due to the suitable energy band of the as-synthesized Bi 24 O 31 Br 10 (E g = 2.51 eV, valence band potential = +2.38 V), while the high conversion rate is largely due to the efficient separation of photogenerated carriers, surface defects, positively charge surface, and 3D micro/nano-architecture. The primary active species, including h + , e − , O 2 − , and OH, are all involved in the photoreaction. On the basis of experimental results and quantum-chemistry calculations, a direct hole oxidative mechanism with two-step dehydrogenation pathway was suggested. In addition, the as-synthesized Bi 24 O 31 Br 10 catalyst remains stable during the photocatalytic process, indicating its potential for practical applications.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2024
·
IF 5.7
Qilin Yang,Yitao Bai,Shuangping Liu,Xiao Han,Tiantian Liu,Dongna Ma,Jian Mao
Elevated levels of biogenic amines (BAs) in fermented food can have negative effects on both the flavor and health. Mining enzymes that degrade BAs is an effective strategy for controlling their content. The study screened a strain of Lactobacillus hilgardii 1614 from fermented food system that can degrade BAs. The multiple copper oxidase genes LHMCO1614 were successfully mined after the whole genome protein sequences of homologous strains were clustered and followed by homology modeling. The enzyme molecules can interact with BAs to stabilize composite structures for catalytic degradation, as shown by molecular docking results. Ingeniously, the kinetic data showed that purified LHMCO1614 was less sensitive to the substrate inhibition of tyramine and phenylethylamine. The degradation rates of tyramine and phenylethylamine in huangjiu (18% vol) after adding LHMCO1614 were 41.35 and 40.21%, respectively. Furthermore, LHMCO1614 demonstrated universality in degrading tyramine and phenylethylamine present in other fermented foods as well. HS-SPME-GC-MS analysis revealed that, except for aldehydes, the addition of enzyme treatment did not significantly alter the levels of major flavor compounds in enzymatically treated fermented foods (p > 0.05). This study presents an enzymatic approach for regulating tyramine and phenylethylamine levels in fermented foods with potential applications both targeted and universal.
研究领域:
微生物学
·
食品安全
·
酶学
✓ 已验证
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Guihong Han,Yifan Du,Yanfang Huang,Shuzhen Yang,Wenjuan Wang,Shengpeng Su,Bingbing Liu
Benzohydroxamic acid (BHA) is intensively used as collector in the mineral processing industry, and thus tremendous hazardous beneficiation wastewater containing BHA organic contaminant needs urgent treatment. In this work, an efficient removal of BHA organic contaminants from various industrial beneficiation wastewaters via the chelation, flocculation, and precipitation flotation process was studied. The removal efficiency of BHA, COD and turbidity of the purified water, and the chelation mechanism were investigated by optical microscope, SEM, FTIR, XPS, Zeta potential, and thermodynamic analyses. The results showed that organic BHA contaminant can be chelated firstly by Cu(II) to form hydrophobic BHA-Cu precipitate effectively via the “O-O” chelation and a five-membered chelation ring was formed under weak alkaline conditions. The generated precipitate was then successfully removed using CTAB as surfactant and NP-40 as frother in a microbubble flotation column. Over 94% BHA was removed under the optimal chelation, flocculation and flotation conditions: chelation with Cu(II) concentration of 30 mg/L and pH of 8 for 30 min; flocculation with CTAB concentration of 0.2 mg/L for 20 min; followed by flotation with NP-40 frother of 0.6 mg /L and air flow rate of 100 mL/min for over 40 min. Under this condition, 83.91% COD was removed, and the residuel COD and turbidity of the purified water were lower than 25 mg/L and 0.1 NTU, respectively, which met the wastewater discharge requirement. It’s demonstrated that the precipitate flotation can be employed as an effective method to purify industrial wastewater containing BHA. In addition, the interaction mechanism of Cu(II) and BHA under different pH values was also discussed in this work.
研究领域:
环境科学
·
化学工程
·
矿物加工工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yongfei Zhu,Yonggang Du,Junming Su,Yanchao Mo,Shujuan Yu,Zhi Wang
Oil/water separation through superhydrophobic sponges is an important method for oily wastewater and organic solvents pollution treatments, and developing a simple and eco-friendly approach to fabricate superhydrophobic sponge is still very urgent and valuable. In this work, Fe 3 O 4 and bio-benzoxazine based on cardanol and long-chain aliphatic amine were successively loaded on melamine sponge (MS) through a simple dip-coating method, which was thermally cured to obtain superhydrophobic MS. The as-prepared superhydrophobic MS (P15C-O/Fe 3 O 4 /MS) not only exhibited high oil absorption capacity from 65.8 to 136.2 times its own weight for various oils and organic solvents, but also showed excellent recyclability with a water contact angle (WCA) of about 149° after 50 absorbing-squeezing cycles and an absorption retention of more than 92% after 100 cycles. Moreover, P15C-O/Fe 3 O 4 /MS also possessed outstanding chemical stability, whose WCA almost kept unchanged after touching with strong acid (pH = 1) and alkali (pH = 13) as well as NaCl solutions for 48 h. The outstanding recyclability and stability of P15C-O/Fe 3 O 4 /MS were from the stability of polybenzoxazine and strong adhesion between the coating and sponge, due to the formation of coordination interactions between Fe 3+ and N, O atoms as well as hydrogen bonds between polybenzoxazine and sponge. In addition, P15C-O/Fe 3 O 4 /MS could be used for continuous oil-water separation and driven remotely by a magnetic force. These advantages make P15C-O/Fe 3 O 4 /MS a potential candidate for large-area oil-spill cleanup and oily wastewater treatment, especially under some dangerous conditions.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Jingwen Tan,Junjie Shao,Yanghao Shi,Wenbiao Zhang,Qingsheng Gao
As a promising route to hydrogenate organic compounds at ambient conditions, electrocatalytic hydrogenation (ECH) urgently demands noble-metal-free electrocatalysts with satisfactory activity and selectivity. Here, molybdenum disulfide intercalated by dimethylamine (MoS2-DMA) demonstrates its superiority associated with the engineered interlayer chemistry in the ECH of nitroarenes to anilines. The in situ intercalation by DMA cations leads to the phase transition from semiconducting 2H to metallic 1T and the formation of abundant sulfur vacancies, which is beneficial for activating nitro groups and stabilizing chemisorbed H intermediate toward fast hydrogenation. In a wide potential range of −0.08 to −0.48 V (vs reversible hydrogen electrode (RHE)), MoS2-DMA affords the excellent ECH performance of p-nitrostyrene to p-aminostyrene with high Faradic efficiency (>90%), yield (>90%), and selectivity (>99%), outperforming typical MoS2. The good efficiency of such intercalated MoS2 within a broad substrate scope further verifies the promise of interlayer engineering for exploiting cost-efficient catalysts in an electrochemical refinery.
研究领域:
电化学
·
催化
·
材料科学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2023
·Vol. 14
·期 47
·5178-5190
·
IF 4.6
Ranran Gao,Xiaoning Guo,Li Wang,Wantai Yang
Stimuli-responsive aggregation-induced emission (AIE) active polymers with structural diversity and tunability in fluorescence responsive behavior are in high demand in practical applications. Recently, tetraphenylethylene (TPE)-appended maleic anhydride terpolymers were proposed as a multi-stimuli-responsive fluorescence platform by our group. Here, we report TPE-containing styrene–maleic acid copolymers with diverse chain topologies and locations of the TPE moiety by reversible activation-fragmentation transfer polymerization (RAFT) with meticulously designed chain transfer agents and a TPE-containing monomer. The fluorescence responsiveness of the copolymers to the pH value, Ca2+, and bovine serum albumin (BSA) was systematically investigated, which showed an influence substantially on both the “stimuli acceptor” and “signaling” sides of the macromolecular structure. The discovery made in our work accentuates the importance of macromolecular engineering in developing fluorescent probes with highly differentiated performance and provides great flexibility in meeting the wide range of requirements of various applications.
研究领域:
高分子化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）