Frontiers in Bioengineering and Biotechnology
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2021
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IF 5.89
Wang Yujie,Hu Kang,Yang Zhiyu,Ye Chenlu,Li Xin,Yan Kai
Bisphenol A (BPA) produced from biomass is a typical endocrine disrupting compound that is carcinogenic and genotoxic and can be accumulated in water due to its extensive use and difficult degradation. In this study, the porous ZnO photocatalyst with core-shell structure and large surface area was successfully developed for the efficient photocatalytic degradation of BPA. The various effects of calcination temperatures, BPA concentrations, ZnO dosages, pH and inorganic ions on the degradation performance were systemically studied. The results showed that 99% degradation of BPA was achieved in 1 h using the porous ZnO calcined at 550°C under the conditions of 30 mg/L BPA, 1 g/L ZnO, and pH of 6.5. Besides, the inhibition effects of anions for the photocatalytic removal of BPA decreased in the order of H2PO4- > HCO3- > SO42- > Cl−, while the cations K+, Ca2+, and Na+ had little effect on the photocatalytic degradation of BPA. The results of scavenging experiments showed that h+, ·O2-, and e− played the key role in the photocatalytic degradation process. Finally, the main pathways of BPA degradation were proposed based on ten intermediates found in the degradation process. This work may provide a good guideline to degrade various endocrine disrupting compounds in wastewater treatment.
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Ning Li,Wenyi Wang,Liuyong Zhu,Wenguang Cui,Xingyu Chen,Bingjie Zhang,Zezhou Zhang
Nanofiber membranes (NFMs) prepared with electrostatic spinning have attracted more and more attention in wastewater treatment owing to its unique advantages of high porosity and large specific surface area. However, the low removal rate of small molecular weight dyes and membrane fouling are the main obstacles for its large-scale application. Therefore, new polyacrylonitrile (PAN)-ZnO NFM was prepared simply and efficiently combined with electrostatic spinning technology and magnetron sputtering. Under the action of electrocatalysis, PAN-ZnO NFM exhibited not only high removal rate (>95%) for Congo red (CR), rhodamine B (RhB), sunset yellow (YS), methyl orange (MO) and methylene blue (MB), but also excellent water flux (1016 L m −2 h −1 Bar −1 ). Moreover, the electrocatalytic stability investigation of PAN-ZnO NFM showed that the membrane still maintained an excellent dye removal rate (>90%) after 10 h of continuous electrocatalytic filtration. Apart from, PAN-ZnO NFM also displayed excellent mechanical properties (252 MPa of Young's modulus) and antifouling ability. The permeate flux recovery rate of more than 90% after electrocatalytic cleaning for 5 min. Due to its excellent properties in dye removal rate, water flux, electrocatalytic stability, and antifouling, PAN-ZnO NFM exhibited an excellent application prospect in textile wastewater treatment.
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Yuze Wang,Ruoyu Xu,Liwei Chen,Chongbei Wu,Lili Qiu,Christopher D. Windle,Qing Han,Liangti Qu
A hierarchical architecture composed of nitrogen (N)-rich carbon@graphitic carbon-coated ZnO nanowire arrays on a graphene fiber (ZnO@C/GF) was fabricated by direct growth of a ZnO@zeolitic imidazolate framework-8 (ZIF-8) core–shell nanowire array on a GF followed by annealing and used as a microelectrode for detection of 2,4,6-trinitrotoluene (TNT). In such a design, ZnO accumulated TNT through a strong nitroxide–zinc interaction and ZIF-8 served as the precursor of the N-rich carbon@graphitic carbon layer that seamlessly connected ZnO with the GF to improve the poor conductivity of ZnO, thus enhancing the sensitivity of the ZnO@C/GF microelectrode. The constructed hierarchical hybrid fiber microsensor exhibited a wide linear response to TNT in a concentration range of 0.1–32.2 μM with a low detection limit of 3.3 nM. This ZnO@C/GF microelectrode was further successfully applied to the detection of TNT in lake and tap water, indicating its promise as a portable sensor for the electrochemical detection of explosive compounds.
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ACS Sustainable Chemistry & Engineering
·
2020
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IF 7.632
Mei Li,Shengbo Zhang,Liwen Li,Jinyu Han,Xinli Zhu,Qingfeng Ge,Hua Wang
The facile synthesis of low-cost, eco-friendly photocatalysts with high charge separation efficiency and CO2 adsorption capacity for efficient photocatalytic CO2 reduction remains a challenge. Herein, a hollow structured p-n heterojunction catalyst, polydopamine (PDA)-ZnO/Co3O4, was successfully synthesized by pyrolyzing bimetallic ZnCo-ZIFs, followed by modification with PDA. Through optimizing the Zn/Co ratio, a high separation efficiency of the photogenerated electron–hole pairs has been achieved. Furthermore, by tuning the content of PDA on the surface of ZnO/Co3O4, the adsorption capacity of CO2 can be maximized. Consequently, PDA15/ZnO/Co3O4 showed a CO production rate of 537.5 μmol/g/h with a CO selectivity of 97.7% without using the photosensitizer and additional sacrificial agent. Band structure based on results of X-ray photoelectron spectroscopy, photoelectrochemical characterization, as well as density functional theory calculation was used to propose a plausible mechanism for photocatalytic CO2 reduction on the PDA15/ZnO/Co3O4. The present study provides an effective approach to fabricate highly efficient photocatalysts based on semiconducting metal oxides for CO2 reduction with remarkable abilities of absorbing lights, separating charge carriers, and adsorbing CO2.
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INDUSTRIAL CROPS AND PRODUCTS
·
2020
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IF 4.244
Binpeng Zhang,Dongjie Yang,Yong Qian,Yuxia Pang,Qiong Li,Xueqing Qiu
Enzymatic hydrolysis lignin (EHL), an industrial waste, is mainly used as a low-grade combustible energy source. Design and preparation of high value-added materials with EHL is still a challenge. Demonstrated here in was the first application of EHL as the precursor for preparing a lignin-based hollow carbon (LHC) with opening structure based on a facial self-assembly and carbonization process. ZnO nanoparticles can be uniformly immobilized on the exterior and interior surface of LHC due to rich oxygen-containing functional groups and opening structure, and composite (ZnO/LHC) was obtained. The ZnO/LHC presented high photocatalytic degradation rate of ciprofloxacin and photocatalytic H 2 evolution rate, which were about 2.0 times and 1.8 times that of pure ZnO, respectively. The enhancement can be attributed to the electronic interaction between ZnO and LHC, endowing ZnO extended photoabsorption region and enhanced separation of hole-electron pairs. Moreover, the hollow and opening structure offered photocatalyst fast substance transfer, abundant active sites and high light-harvesting. Besides, the recyclability of ZnO was also improved after the introduction of LHC. Our study not only opens up new avenues for the high value-added application of EHL, but also offers a simple strategy to promote the practical use of ZnO photocatalyst.
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Sustainable Energy & Fuels
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2020
·Vol. 4
·期 10
·5203-5214
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IF 5.503
Chaowei Huang,Qiuting Li,Yubin Yang,Sheng Wei,Rong Ji,Qingfeng Zhang,Yucao Zhu,Huanzhi Zhang,Fen Xu,Lixian Sun,Yongpeng Xia
A novel bifunctional microencapsulated phase change material (PCM) was synthesized via in situ polymerization by creatively introducing zinc oxide nanoparticles (nano-ZnO) into the polymer shell, which provided the microencapsulated PCMs with good light–thermal conversion properties and thermal stability. Nano-ZnO, which possesses solar absorption properties and good mechanical and chemical stability, can also endow the MPCMs with good comprehensive properties. Differential scanning calorimetry results confirmed that the microencapsulated PCMs possess outstanding latent heat storage capacity with an encapsulation efficiency of 51.40%. And the melting enthalpy reached 123.90 J g−1, exhibiting an excellent thermal reliability for 100 thermal cycles. Moreover, the microencapsulated PCMs showed a high photothermal storage efficiency of about 75.2%. These results demonstrated that the obtained microencapsulated PCMs not only possess excellent thermal energy storage capacity but also have high light–thermal storage efficiency, which may expand the potential applications of thermal energy storage.
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APPLIED SURFACE SCIENCE
·
2020
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IF 6.182
Guanhua Zhang,Tiantian Dai,Yue Meng,Lianyang Zhang,Chao Yang,Guoxiang Pan,Zheming Ni,Shengjie Xia
Z-scheme heterojunction catalysts are novel photocatalytic materials with wide application prospects because of their promise for the engineering of band structure to achieve high-speed hot carrier-transfer and strong redox tunability. A bridged-Au Z-scheme heterojunction catalyst (ZnO-Au-ZnAl 2 O 4 ) was synthesized using layered double hydroxides (LDHs) as the backbone. The atomistic and architectural structures, elemental composition and and visible-light absorption of as-prepared photocatalysts were systematically investigated and characterized. The presence of Z-scheme heterojunctions in ZnO-Au-ZnAl 2 O 4 can significantly improve the photocatalytic activity under visible light irradiation with a reaction rate constant of 0.5503 h −1 (ZnO-Au(2%)-ZnAl 2 O 4 ), 27.2 times that of pure ZnO (0.0202 h −1 ) and 9.8 times that of ZnO-ZnAl 2 O 4 (0.0389 h −1 ). We further investigated the reaction kinetics of the heterostructure catalyst in the photodegradation of catechol , where the effect of the catalyst dosage, initial pH, irradiation intensity and reaction temperature were discussed. Based on the mechanism study in the capture and detection of photo-generated radicals and the calculation of band structures by DFT (work function), the successful construction of bridged-Au Z-scheme heterojunction was further proven. Au nanoparticles sandwiched between ZnO and ZnAl 2 O 4 play a vital role for the formation of a built-in electric field (BIEF) between ZnO and ZnAl 2 O 4 , which can significantly facilitate the transfer of hot carriers in the photocatalytic system.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xuecheng Liu,Lin Liu,Zurun Yao,Zhehan Yang,Hui Xu
The nitrogen-rich ZnO/g-C 3 N 4 composites were prepared and exhibited excellent photocatalytic performance for hydrogen evolution and NO photo-oxidation under visible-light illumination. The obtained nitrogen-rich ZnO/g-C 3 N 4 composite has efficient visible-light utilization and effective separation of photogenerated electron-hole pairs. Experimental data verifies that the photocatalytic activity of ZnO/g-C 3 N 4 composite could be improved by N dopant. NZnOCN1 composite exhibits the highest photocatalytic activity for H 2 evolution and NO removal. The results show that the possible mechanism of the photocatalytic H 2 evolution reaction is the type II mechanism, while the Z-scheme mechanism of nitrogen-rich ZnO/g-C 3 N 4 composite is conducive to NO photo-oxidation.
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LANGMUIR
·
2019
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IF 3.683
Jie Chen,Yan Xiong,Ming Duan,Xiang Li,Jun Li,Shenwen Fang,Sha Qin,Run Zhang
The adsorption of dye molecules is an important process for the photodegradation removal of dye pollutants. In this work, a semiconductor photocatalyst of Cr-doped ZnO nanorods (Cr–ZnO NRs) was synthesized, and its adsorption–photocatalysis synergy (APS) effect was investigated for anionic methyl orange (MO–) and cationic methylene blue (MB+). The detailed thermodynamic information (including adsorption maximum capacity qmax, adsorption equilibrium constant Kads and adsorption efficiency AE %) and dynamic information (including adsorption rate constant ka, degradation rate constant kd and degradation efficiency DE %) were obtained to evaluate the different reaction performances for MO– and MB+. With qmax(MB+) = 40.59 mg g–1 > qmax(MO–) = 15.95 mg g–1, ka(MB+) = 20.61 min–1 > ka(MO–) = 4.62 min–1, and AE(MB+) = 40% > AE(MO–) = 9%, Cr–ZnO NRs showed much superior adsorption performance for MB+ than MO–. With kd (MB+) = 0.0430 min–1 > kd (MO–) = 0.0014 min–1 and DE(MB+) = 98% > AE(MO–) = 20%, Cr–ZnO NRs also showed much superior photodegradation performance for MB+ than MO–. The APS mechanism of Cr–ZnO NRs is revealed to be multiple π–π interactions and stronger electrostatic attractions dominant for enhanced adsorption of MB+ and higher AE and more photocatalytic active species dominant for enhanced photodegradation of MB+. The APS was furthermore characterized and verified by zeta potential analysis, Fourier transform infrared investigation, and fluorescence imaging. The results indicate that Cr–ZnO NRs are promising adsorbent and photocatalyst candidates favorable for positive MB+ than negative MO–. Such an APS investigation can effectively help to improve the photodegradation treatment performance of photocatalysts for dye pollutant removal.
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NEW JOURNAL OF CHEMISTRY
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2019
·Vol. 43
·期 48
·19223-19231
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IF 3.069
Yingying Lv,Jiayu Lin,Siyan Peng,Laijun Zhang,Leshu Yu
The practical application of ZnO nanopowders (NPs) in purifying wastewater could be determined by some issues, such as low-cost and scalable preparation, high photocatalytic activity, antiphotocorrosion, and convenient recycling. In this contribution, a series of ZnO NPs were prepared in a scalable way in the 220 °C, 250 °C and 280 °C autoclaves, respectively. The structural, morphological and surface details of the samples were systematically examined by XRD, SEM, FT-IR, TEM, Raman, PL, and UV-visible spectroscopy. Along with the increase of the reaction temperature, the mean diameter of ZnO NPs increased in the range of 110–130 nm, and the color of the products was lighter, resulting in a smaller surface area but a stronger UV absorbance in the region of 200–400 nm. Moreover, the preferential growth along the (002) plane, the crystalline degree and the green emission intensity of ZnO 280 are more overt than those of ZnO 250 and ZnO 220. Some other parameters including stretching vibration and E2(high) mode of Zn–O bonding or diffraction peaks of ZnO 280 also shifted to lower wavenumbers or lower angles when compared to those of ZnO 220, revealing the existence of more oxygen vacancies in ZnO 280. As expected, ZnO 280 showed the best photocatalytic activity and antiphotocorrosion among the three samples in the degradation of rhodamine B due to the availability of abundant oxygen vacancies, preferential growth along the (002) direction and the high crystalline degree. This suggests that, along with the increase of the preparation temperature, the obtained ZnO nanopowders exhibit better photocatalytic activity. Therefore this work could provide a route to synthesize well crystalline ZnO nanopowders and open up an avenue for commercial applications of ZnO NPs in the treatment of organic wastewater.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Xiao Chang,Xiaofang Li,Xurong Qiao,Kun Li,Ya Xiong,Xiao Li,Tianchao Guo,Lei Zhu,Qingzhong Xue
It is imperative to explore an accurate ppb-level acetone sensor for noninvasive detection of diabetes. In this work, two dimensional p-type MoS 2 nanosheets are introduced on the surface of p-type ZnO derived from metal-organic frameworks (MOFs) to produce ZnO@MoS 2 core/shell heterojunctions as a novel acetone sensor, showing a great enhancement of acetone response, about two orders of magnitude than that of pure ZnO derived from MOFs. For example, the ZnO@MoS 2 exhibits about 80 times enhancement in response to 100 ppb acetone than that of pure ZnO. More importantly, this ZnO@MoS 2 heterojunctions sensor exhibits an ultra-fast response/recovery to ultra-low concentration acetone (60 s/40 s @ 5 ppb), which is the best acetone sensing performance for the metal oxide-based materials reported to date. Moreover, the acetone sensing performances are negligibly affected by humidity and other gas, which is suitable for exhaled acetone detection. Finally, it is elucidated that the sharp increase of negative heterojunction interface resistance, ultra-fast gas diffusion rates in MoS 2 nanosheets and strong interaction energy are key factors for the excellent acetone sensing properties of ZnO@MoS 2 . This work opens up a novel and efficient way for ultra-low concentration gas detection.
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International Journal of Nanomedicine
·
2023
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IF 8
Nan Jiang,Shuaiwei Zhao,Shilei Wang,Zhong Lu
Introduction As a biofilm-associated disease, dental caries benefits from nanoparticle (NP)-based therapies. Streptococcus mutans (S. mutans) is a primary aetiologic agent for dental caries development. We successfully applied a synergistic therapy of Ag/ZnO nanocomposites combined with light-emitting diode (LED) radiation to inhibit S. mutans biofilms. However, the antibiofilm mechanism has not been fully elucidated, and little is known about the biofilm formation ability of bacteria that survive NP-based therapies.Methods This study explored the antibiofilm formation mechanism of this synergistic therapy by an integrated approach based upon proteomics.Results Synergistic therapy killed 99.8% of bacteria, while the biofilm formation ability of 0.2% surviving bacteria was inhibited. The proteomic responses of S. mutans to synergistic therapy were comprehensively characterized to unveil the mechanism of bacterial death and biofilm formation inhibition of the surviving bacteria. In total, 55 differentially expressed proteins (12 upregulated and 43 downregulated) were recorded. The bioinformatic analysis demonstrated that cellular integrity damage and regulated expression of structure-associated proteins were the main reasons for bacterial death. In addition, the proteomic study indicated the potential inhibition of metabolism in surviving bacteria and provided a biofilm-related network consisting of 17 differentially expressed proteins, explaining the multiantibiofilm formation actions. Finally, we reported and verified the inhibitory effects of synergistic therapy on sucrose metabolism and D-alanine metabolism, which disturbed the biofilm formation of surviving bacteria.Conclusion Our findings demonstrated that synergistic therapy killed most bacteria and inhibited the surviving bacteria from forming biofilms. Furthermore, the antibiofilm formation mechanism was revealed by proteomics analysis of S. mutans after synergistic therapy and subsequent metabolic studies. Our success may provide a showcase to explore the antibiofilm formation mechanism of NP-based therapies using proteomic studies.
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