COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Muhua Chen,Shang Wei,Jiayi Wu,Jingrun Li,Bo Fu,Xinbao Zhu
Visible light driven antibiotic degradation with metal-organic frameworks (MOFs) has been regarded as a feasible and efficient approach. Herein, Bi-based MOF (CAU-17) was synthesized and used for tetracycline (TC) removal. To enhance the photocatalytic performance, sulfur (S) element was doped on CAU-17 through solvothermal process. Characterization results verified that S element was successfully doped on CAU-17 and distributed uniformly. The introduction of S element could boost the generation of oxygen vacancies and tune the band gap of CAU-17. By optimizing the S content, the band gap energy (E g ) of CAU-17–0.02 S sample (0.02 g thiourea was added during the synthesis) reduces from 3.57 to 3.37 eV compared to pristine CAU-17. In addition, the visible light response was enhanced and the charge transfer resistance was reduced. TC removal tests demonstrated that CAU-17–0.02 S exhibited a removal efficiency of 62.9%, and the degradation rate constant is 1.44 times than that of bare CAU-17. Reactive species trapping experiment indicated h + ,·OH and·O 2 - all promoted the degradation of TC, following the order of h + >·OH> ·O 2 - . Moreover, CAU-17–0 . 02 S presented a good reusability with slight performance loss after four cycles.
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Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Weichao Xu,Yuxuan Yi,Kunhao Guo,Anming Li,Xuehan Zhang,Feng Guo
The combination of photocatalysis and enzyme catalysis makes many previously difficult or slow chemical reactions easy to realize. A novel [email protected] −C 3 N 4 biohybrid catalyst was successfully synthesized using a simple in situ synthesis method to remove 4- tert -butylphenol (4- t -BP). A series of characterization methods were used to investigate the structure, morphology, chemistry, and optical properties of biohybrid catalysts. [email protected] −C 3 N 4 has improved photogenerated electron-hole pair separation efficiency and charge carrier mobility , as well as photocatalytic activity, with a removal rate of 4- t -BP nearly 100% within 180 min. The catalyst recycling test revealed that the composite could maintain its high removal efficiency after 10 recyclings. Meanwhile, the photocatalytic mechanism investigation reveals that ∙O 2 − play critical roles in the removal of 4- t- BP by g−C 3 N 4 . A detailed examination of the mechanism and pathway of 4- t -BP removal by photoenzyme oxidation was also carried out. This biohybrid catalyst opened up a new avenue for the advancement of environmental protection technology .
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jingxiao Chen,Yufeng Wang,Le Li,Yue-E Miao,Xu Zhao,Xiu-Ping Yan,Chao Zhang,Wei Feng,Tianxi Liu
The development of ultrastretchable ionogels with a combination of high transparency and unique waterproofness is central to the development of emerging skin-inspired sensors. In this study, an ultrastretchable semicrystalline fluorinated ionogel (SFIG) with visible-light transparency and underwater stability is prepared through one-pot copolymerization of acrylic acid and fluorinated acrylate monomers in a mixed solution of poly(ethylene oxide) (PEO) and fluorinated ionic liquids. Benefiting from the formation of the PEO-chain semicrystalline microstructures and the abundant noncovalent interactions (reversible hydrogen bonds and ion–dipole interactions) in an ionogel, SFIG is rendered with room-temperature stable cross-linking structures, providing high mechanical elasticity as well as high chain segment dynamics for self-healing and efficient energy absorption during the deformation. The resultant SFIG exhibits excellent stretchability (>2500%), improved mechanical toughness (7.4 MJ m–3), and room-temperature self-healability. Due to the high compatibility and abundance of hydrophobic fluorinated moieties in the ionogel, the SFIG demonstrates high visible-light transparency (>97%) and excellent waterproofness. Due to these unique advantages, the as-prepared SFIG is capable of working as an ultrastretchable ionic conductor in capacitive-type strain sensors, demonstrating excellent underwater strain-sensing performances with high sensitivity, large detecting range, and exceptional durability. This work might provide a straightforward and efficient method for obtaining waterproof ionogel elastomers for application in next-generation underwater sensors and communications.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Haobing Zhao,Hailong Hu,Jinping Zheng,Yuan Qie,Kuibao Yu,Yangbin Zhu,Zhiqi Luo,Lihua Lin,Kaiyu Yang,Tailiang Guo,Fushan Li
With tunable emission in the full visible region, the ecofriendly InP quantum dots (QDs) show unique application prospects in light-emitting devices. At present, InP QDs suffer from wide-bandwidth emission, especially for electroluminescence (EL), which hinders their applications in high-performance display devices. Here, we report a facile one-pot synthesis of narrow-bandwidth InP/ZnSeS/ZnS QDs using a safe phosphorus source of tris(dimethylamino)phosphine, in which the ZnSeS inner-shell layer is formed via temperature-gradient solution growth from 240 to 280 °C. The synthesized green QDs have a high photoluminescence quantum yield (PLQY) of 91% and full width at half-maximum (fwhm) of 36 nm. Moreover, the resultant quantum dot light-emitting devices (QLEDs) also show a narrow fwhm of 42 nm, which is the narrowest emission of green InP QLEDs based on a safe phosphorus source reported so far. Further modulation of the electron injection into the device by inserting a thin layer of lithium fluoride results in a peak external quantum efficiency of 5.56%.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 6
·3654-3662
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IF 3.9
Kailei Lu,Wenhan Han,Gang Cheng,Xinghua Zhu,Shirui Li,Hao Guo,Bosen Gu,Yucheng Ye,Jianqi Qi,Tiecheng Lu
Attaining effective warm white light emitting in functionally advantageous transparent polycrystalline ceramics is vitally important to guarantee the development of both human and botanical systems. In response to this aim, a series of Dy 3+ -doped Y 2 Zr 2 O 7 (YZO) transparent ceramics were prepared via a solid-state reaction and vacuum sintering approach in this work. These fabricated ceramics show high transparency, where the in-line transmittance at 700 nm is about 76%, which is very close to the theoretical limit (78%). In addition, under the excitation of UV light sources (358 and 384 nm), strong warm white light emissions were observed in these YZO:Dy transparent ceramics. The corresponding photoluminescence characteristics and mechanisms of YZO:Dy ceramics are investigated carefully. The Dy-doped YZO ceramics integrate with high transparency and UV-excitable warm white light emission properties, making them promising light-emitting converter materials for light-emitting source applications.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Chengli Wang,Mengqiang Zhang,Hui Yu,Wenjie Zhang,Ge Shi,Xiaomeng Zhang,Zhe Cui,Peng Fu,Minying Liu,Xiaoguang Qiao,Yanjie He,Xinchang Pang
Although tremendous advancement regarding the highly stable metal halide perovskite nanocrystals (PNCs) has been achieved, previous studies were primarily focused on green light-emitting PNCs (i.e., bromine-based PNCs). The stability of chlorine-based PNCs with a violet or blue emission property was still lagging behind that of their bromine-based counterparts. Herein, a nondemanding and versatile strategy for in situ encapsulating all-inorganic chlorine-based PNCs with multifold exceptionally high stabilities was presented. Well-ordered mesoporous silica enabled the confined growth of PNCs in its pores followed by the porosity sealing by tetramethyl orthosilicate hydrolysis, thereby rendering full encapsulation of chlorine-based PNCs in dense silica that originated from high-temperature calcination. This judiciously designed structure imparted enclosed violet/blue emitting PNCs impart with outstanding long-term stability (>1.5 year) with high photoluminescence quantum yield (i.e., 30.4%) in pure water as the result of complete isolation of PNCs from detrimental stimuli, eventually leading to the application in the white light-emitting diode device.
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 4
·1128-1139
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IF 5
Peijing Guo,Shaoyu Yuan,Bingrong Guo,Siwei Li,Yongjun Gao
A CoO–CdS heterostructured photocatalyst CC-2-300 loaded with carbon derived from the biomass material chitosan was synthesized. Under visible-light irradiation, the photocatalytic hydrogen evolution rate can reach up to 10.60 mmol gcat−1 h−1, which is 7.21 times higher than that of pure CdS under the same conditions, with good cycle stability and high apparent quantum efficiency. The control experiments and characterization results prove that the chitosan-derived carbon supported CoO nanorods and CdS nanoparticles are cross-distributed to form a direct Z-scheme heterojunction, which improves the migration efficiency of photogenerated carriers and effectively slows down the recombination rate of photogenerated charges and holes on CdS that is susceptible to photocorrosion, thus improving the efficiency of photocatalytic hydrogen evolution.
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Materials Today Sustainability
·
2022
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IF 7.244
S. Wei,S. Fan,M. Zhang,J. Ren,B. Jia,Y. Wang,R. Wu,Z. Fang,Q. Liang
Different from traditional dye sensitization by chemisorption in the dark, this work uses electron trapping sites and positively charged rhodamine B dye molecules to achieve electrostatic interaction under irradiation. As the irradiation time increases, the surface oxygen vacancies of Bi 2 MoO 6 as the electron trapping sites gather a large number of electrons forming negative surface, which are tightly bound to the positive rhodamine B dye molecules. In the dye-sensitized Bi 2 MoO 6 system, the electrons located on the oxygen vacancies can reduce the oxidized dyes to ground state. The newly formed ground-state dyes are photoexcited again and inject electrons into the conduction band of the Bi 2 MoO 6 to participate in photodegradation levofloxacin. Then the newly aggregated electrons on the oxygen vacancies repeat the above cycle. The formation of the cyclic path greatly reduces the recombination of electrons and holes in Bi 2 MoO 6 , which increases the efficiency of photocatalytic degradation of levofloxacin from ∼43.5% to ∼98.3% under LED irradiation for 2 h. In addition, the photodegradation pathway of levofloxacin is investigated.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Xuejiao Feng,Huishan Shang,Jinling Zhou,Xuke Ma,Xiangyang Gao,Dan Wang,Bing Zhang,Yafei Zhao
Rational constructing hierarchical core–shell structured photocatalysts to accelerate the separation and transfer of light-induced electrons is extraordinarily indispensable to boost the performance of photocatalytic hydrogen evolution. Herein, we integrate two-dimensional (2D) ZnIn 2 S 4 (ZIS) nanosheets and flower-like CoS 1.097 assembled with one-dimensional (1D) nanothorns to construct hierarchical 1D/2D CoS 1.097 @ZIS with ZIS nanosheets and CoS 1.097 nanothorns as shell and core respectively as an effective visible light photocatalyst to produce hydrogen from water splitting. The optimized 8.5-CoS 1.097 @ZIS photocatalyst demonstrates an outstanding activity with hydrogen production rate of 2632.33 µmol g −1 h −1 (6.42 times of ZIS alone) and good stability for photocatalytic water splitting. The enhanced performance can be ascribed to the distinctive structure and composition of CoS 1.097 @ZIS, which affords intimate contact interface, strong light absorption and abundant reaction sites, thus facilitating the separation and transfer of the charge carriers as well as inhibiting charge recombination. This work offers a prospective approach to construct 1D/2D core–shell ZIS-based photocatalysts for hydrogen production from water splitting.
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WATER RESEARCH
·
2019
·
IF 7.913
Wanjun Wang,Hanna Wang,Guiying Li,Taicheng An,Huijun Zhao,Po Keung Wong
The development of cost-effective water disinfection methods is highly desired to address the problems caused by outbreak of harmful microorganisms . Sulfate radical (•SO 4 − )-based advanced oxidation technology has attracted increasing attention. However, various catalysts or UV irradiation are usually used to activate persulfate (PS), which is high-cost and the recovery of nano-sized catalysts is also challenging. This work demonstrates a new method of catalyst-free activation of persulfate by visible light (VL) for bacterial inactivation. The 6-log of E. coli cells can be inactivated within 40 min and 7-log of E. coli cells could be inactivated within 120 min by the VL/PS system. The major responsive wavelength is 420 nm, and no heat activation of PS is found during VL irradiation. A synergistic effect with synergy factor of 51.2% is found when combining the VL irradiation with heating at 50 °C. The acidic pH is benefit for the VL/PS-triggered bacterial inactivation, while bicarbonate inhibits the E. coli inactivation at the range of 0.1–20 mg/L. Mechanism study indicates the main reactive species are •SO 4 − , •O 2 − and •OH, in which •SO 4 − plays the most important role. The bacterial inactivation process shows to begin from outer membrane to intracellular components. Subsequently, the antioxidant enzyme (i.e. SOD, CAT) is induced, followed by damaging to the genomic DNA leading to fatal death of the cells. In addition, the VL/PS system is also applicable for the inactivation of other pathogenic bacteria, including Staphylococcus aureus and Pseudomonas aeruginosa , showing universality for water disinfection applications. This work not only provides a new cost-effective disinfection method without a catalyst, but also sheds light on understanding the bacterial inactivation mechanism by •SO 4 − -based AOPs .
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MOLECULES
·
2019
·Vol. 24
·期 2
·344
·
IF 3.06
Xiong Sun,Hui-Jun Li,Nanquan Ou,Bowen Lyu,Bojie Gui,Shiwei Tian,Dongjin Qian,Xianying Wang,Junhe Yang
Nitrogen doped graphene quantum dots (NGQDs) were successfully prepared via a hydrothermal method using citric acid and urea as the carbon and nitrogen precursors, respectively. Due to different post-treatment processes, the obtained NGQDs with different surface modifications exhibited blue light emission, while their visible-light absorption was obviously different. To further understand the roles of nitrogen dopants and N-containing surface groups of NGQDs in the photocatalytic performance, their corresponding composites with TiO2were utilized to degrade RhB solutions under visible-light irradiation. A series of characterization and photocatalytic performance tests were carried out, which demonstrated that NGQDs play a significant role in enhancing visible-light driven photocatalytic activity and the carrier separation process. The enhanced photocatalytic activity of the NGQDs/TiO2composites can possibly be attributed to an enhanced visible light absorption ability, and an improved separation and transfer rate of photogenerated carriers.Keywords:N-doping GQDs;titanium dioxide;surface modification;photocatalytic;RhB degradation
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-9
·
IF 5.479
Sun Huaijing,Mei Qingsong,Shikha Swati,Liu Jinliang,Zhang Jing,Zhang Yong
The authors describe the use of white-light emitting upconversion nanoparticles (WL-UCNPs) for visual detection of the pesticide thiram. The method is demonstrated to undergo a better discernable color change upon target binding. The WL-UCNPs are modified with the lead(II)-dithizone complex which acts as the energy acceptor and recognition unit. This leads to quenching of the blue (475 nm) and green (545 nm) emissions of the WL-UCNPs, while the red emission (650 nm) remains unaffected. Upon addition of thiram, the quenched emissions are recovered, with a linear signal increase in the range from 2 nM to 20 nM of thiram and a limit of detection of 0.26 nM. The nanoprobe was further integrated into a test paper for visual detection. The concentration-dependent color change that varies from red to cyan and bluish violet and then to white can be visually distinguished.
Schematic presentation of a white-light emissive upconversion nanoparticle based test paper for color-discernable detection of the pesticide thiram. The test stripe exhibits a concentration-dependent color variation spanning from red, cyan, to bluish violet, and at last to white.
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