JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yingzhen Wu,Lin Lin,Zheng Li,Yanan Zhang,Zhuohong Feng,Zhezhe Wang,Zhiqiang Zheng
Up to now, the research field of application of lanthanide ions doped lead-free double perovskite Cs 2 AgInCl 6 nanocrystals (NCs) was relatively limited, even less in temperature sensing. Here, Tb 3+ /Ho 3+ /Bi 3+ ions were successfully doped into Cs 2 AgInCl 6 NCs by hot-injection. The temperature sensing performance of co-doped NCs by using the fluorescence intensity ratio (FIR) was studied through the temperature-dependent emission spectra . By analyzing the influence of ions' doping concentration on temperature sensing performance, the optimal doping concentration of co-doped Cs 2 AgInCl 6 NCs was determined to be 7 % Tb 3+ , 20 % Ho 3+ and 1 % Bi 3+ . The highest absolute and relative sensitivities reach 1.48 K −1 and 2.48 %/K, respectively. We provide a new doping scheme of lead-free double perovskite NCs which have good temperature sensing performance. This co-doped NCs have great potential application value in non-contact temperature sensing in nanoscale .
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ADVANCED MATERIALS
·
2023
·Vol. 35
·期 25
·2300118
·
IF 29.4
Hongfei Li,Xiaoqi Liu,Donglei Zhou,Biao Dong,Lin Xu,Xue Bai,Hongwei Song
Erbium ions (Er 3+ , 1.54 µm) electric pumped light sources with excellent optical properties and a simple fabrication process are urgently desired to satisfy the development of silicon-based integration photonics. The previous Er-based electroluminescence devices are mainly based on Er-complexes or Er-doped oxide compounds, which usually suffer from low external quantum efficiency(EQE)or high applied voltage etc. In this work, a novel type of Er 3+ /Yb 3+ co-doped lead-halide perovskite films (Er 3+ /Yb 3+ :CsPbCl 3 ) with the maximum photoluminescence quantum yield of 30.12% are prepared by a simple two-step solution-coating method and the corresponding light emitting diodes (Er-PeLEDs) are fabricated, which demonstrate an almost pure 1.54-µm emission and a peak EQE up to 0.366% at a low applied voltage of 1.4 V. Strong negative thermal quenching effect may help Er-PeLEDs suppress Joule heating quenching. These excellent LED properties benefit mainly from the outstanding regulatory performance of acetate to perovskite films, the excellent semiconductor behavior and strong ionic property of the perovskite, and the involvement of Yb 3+ ions, which can directly and efficiently transfer the exciton energy to Er 3+ through a quantum cutting process. Overall, the realization of 1.54-µm Er-PeLEDs offers new opportunities for silicon-based integrated light sources.
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Catalysts
·
2023
·Vol. 13
·期 4
·715
·
IF 3.9
Dongrui Hou,Jing Luo,Qinggong Sun,Mengyang Zhang,Jianfeng Wang
In this study, Co-modified alkalinized g-C3N4(named Co-CNK-OH) was prepared for the Fenton-like photocatalytic degradation of tetracycline (TC) via a simple yet effective calcination–impregnation method. In all samples of CNK-OH with different Co2+loadings, Co-CNK-OH catalyst with the optimal content (9%) exhibited the highest catalytic activity, with 87.1% tetracycline removal and 50% removal efficiency of the total organic carbon (TOC). Mechanism studies revealed that the 9%Co-CNK-OH catalyst had the lower electrical resistance after alkalization treatment and Co2+modification, leading to a significantly accelerated interfacial charge transfer to the electron acceptor as well as effectively separating electrons and holes. The intermediates generated during the TC degradation in the photo-Fenton process were detected by HPLC-MS, which proved that the holes, superoxide radicals, and singlet oxygen are the key reactive species in the Fenton-like photocatalysis. This study provides a new option for the treatment of TC in wastewater.Keywords:Fenton-like photocatalysis;Co-CNK-OH;tetracycline;reactive oxygen species
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhousu Xu,Yijian Yang,Peng Wang,Xiaofeng Liu,Jianrong Qiu
Nd 3+ co-doped CsPbBr 3 perovskite quantum dots (PQDs) glasses were prepared by conventional melt-quenching followed by a thermal treatment process. With the introduction of Nd 2 O 3 to the parent glass, the optical properties of the CsPbBr 3 PQDs are significantly improved. The energy transfer from CsPbBr 3 PQDs to Nd 3+ ions was investigated and confirmed by excitation and emission spectra. The results show that visible excitation band width for the near-infrared (NIR) emission of Nd 3+ ions is significantly increased in the presence of PQDs. The strategy for modulation of the optical properties by the energy transfer between rare earth ions and PQDs in the glass matrix could be further utilized for spectral engineering of photonic glasses for optoelectronic applications.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 9
·1-11
·
IF 5.7
Liu Yujie,Gao Ran,Liu Xingcen,Zheng Jinhua,Wu Xia
Curcumin (Cur) possesses diverse biological and pharmacologic effects. It is widely used as a food additive and therapeutic medicine. A study to determine a sensitive detection method for Cur is necessary and meaningful. In this work, double rare earth ions co-doped fluorescent coordination polymer nanoparticles (CPNPs) were developed for the Cur detection. The CPNPs were synthesized by using adenosine monophosphate (AMP) as bridge ligands via coordination self-assembly with Ce 3+ and Tb 3+ . The AMP-Ce/Tb CPNPs exhibited the characteristic green fluorescence of Tb 3+ and had high luminescence efficiency. Under the optimal conditions, the fluorescence intensity of AMP-Ce/Tb CPNPs could be significantly quenched by Cur. The fluorescence quenching extent at λ ex / λ em of 300 nm/544 nm showed a good linear relationship with the Cur concentration in the range of 10 to 1000 nM. The detection limit was as low as 8.0 nM ( S/N = 3). This method was successfully applied to the determination of Cur in real samples with satisfactory results. The luminescence mechanism of AMP-Ce/Tb CPNPs and the fluorescence quenching mechanism of the CPNPs by Cur were both examined. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Zhanwei Chen,Chen Wu,Wenrui Li,Shaowei Yang,Haidong Shen,Runze Gao,Tianshuai Wang,Qiuyu Zhang,Hepeng Zhang
The strength and micro-distance of acidic and basic sites on acid-base pair catalysts (ABPC) are crucial in determining their synergistic effect and catalytic capacity, yet challenging in the synthesis of effective ABPC due to the tunable difficulties. Here, a Co-ZnO ABPC, containing adjacent Co single atoms-ZnO nanocluster acid-base pairs, was prepared by pyrolyzing ZnCo ZIF-precursor under vacuum. Benefiting from the unique acid-base pair features, Co-ZnO ABPC exhibited outstanding performance for the catalytic hydrogen transfer (CHT) cascade reaction, achieving high nitrobenzene conversion (95 %) and imine selectivity (98 %) at 160 ℃ for 3 h, exceeded almost all the documented catalysts. Both the experimental and calculation results verified the stronger acidity of Co SAs and the synergistic effect of acid-base sites lowered the free energy barrier. This work provides not only prospective insight into the effect of acid-base sites on the catalytic capacity but also a guide for the rational design of efficient ABPC.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 3.9
Chang Li,Zixuan Li,Yan Sun
Laccase , a green biocatalyst , has been widely used in the field of biodegradation with the assistance of electron mediators. Herein, a novel strategy, polyethyleneimine (PEI)-induced biomimetic mineralization , was explored and applied to co-immobilize laccase and 2,2′-azino bis (3-ethylbenzothiazoline)-6-sulfonic acid (ABTS). With the PEI doping, calcium phosphate (CaP) could facilely mineralize within 20 min to form PEI@CaP; ABTS could be co-mineralized with PEI to form (PEI + ABTS)@CaP. Laccase, a negatively charged protein, was then immobilized via electrostatic adsorption onto the embedded PEI in the carriers. Both of the immobilized laccase preparations, denoted as Lac-PEI@CaP and Lac-(PEI + ABTS)@CaP, showed high activity recoveries (96.4 % and 88.0 %, respectively), and increased pH tolerance and storage stability as compared to free laccase. ABTS and laccase loading densities of Lac-(PEI + ABTS)@CaP reached 0.83 mmol g −1 and 100 mg g −1 , respectively. Lac-(PEI + ABTS)@CaP presented higher malachite green (MG) degradation capability than free laccase and Lac-PEI@CaP with free ABTS, possibly due to the proximity effect of the co-immobilized laccase and ABTS. Moreover, Lac-(PEI + ABTS)@CaP exhibited reusability and kept 83.2 % of MG degradation activity after three recycles and 37.9 % in the sixth. This work provided a new strategy for the co-immobilization of laccase and electron mediator, and demonstrated the potential of the biocatalyst for organic pollutant removal.
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JOURNAL OF CHROMATOGRAPHY A
·
2023
·
IF 4.1
Tianpei Cai,Xiaoyu Sun,Jia Chen,Hongdeng Qiu
In this work, tetraethylenepentamine (TEPA) was used as precursor and reaction medium to prepare tetraethylenepentamine-functionalized carbon dots (TEPACDs), the resultant mixture was subsequently silanized and then grafted on the surface of bare silica. The obtained tetraethylenepentamine-functionalized carbon dots and tetraethylenepentamine co-modified silica stationary phase (Sil-TEPA/CDs) was characterized by multiple ways, such as Fourier transformed infrared spectroscopy (FTIR), elemental analysis and transmission electron microscope, which revealed the successful preparation of the mixed stationary phase and higher density of functional groups on co-modified stationary phase than precursor single-modified stationary phase. The synergistic effect of TEPACDs and TEPA was proved by comparing the separation performance of Sil-TEPA/CDs and Sil-TEPA toward amino acids, nucleosides, and nucleobases, which distinctly enhanced the selectivity of Sil-TEPA/CDs. Thus, 12 nucleosides and nucleobases and 11 amino acids was nicely separated on Sil-TEPA/CDs. By study the influences of the changes of mobile phase composition, mobile phase buffer concentration and buffer pH on the retention behaviors of Sil-TEPA and Sil-TEPA/CDs, it was found that both hydrophilic partitioning and adsorption of analytes on Sil-TEPA/CDs were enhanced benefit from the co-existence of TEPA and TEPACDs, which provided the analytes better separation performance. By comparing the column quality of Sil-TEPA/CDs with four commercially available columns, Sil-TEPA/CDs exhibited the best peak asymmetry of 0.98, and second best column efficiency of 43895 m −1 using guanosine as analyte. The RSD ( n = 9) of the retention times of five selected analytes on Sil-TEPA/CDs were within 0.30–0.61% during 40 h of continuously elution, which implied excellent stability of prepared packing material.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Li Gong,Leben Qiu,Xiaoqian Xing,Jieyun Zhu,Mengzhi Lu,Feier Dong,Yan Yu,Weiting Yu
Selectively reducing nitroaromatics into aromatic amines will not only remove nitroaromatic pollutants in waste effluents to reduce environmental risks, but also yield important feedstocks for chemical industrial manufactures. In this study, a FeCo-co-embedded N-doped Carbon (FeCo-N-C) catalyst with Fe-Co atomic pair has been identified with favorable activity, superior selectivity , excellent reusability, as well as outstanding performance in the treatment of real water. The combined results from theoretical study and experimental tests indicate that the improved catalytic performance of FeCo-N-C is owing to the narrowed band gap and electron delocalization caused by the Fe-Co atomic pair which can improve electron transport in its catalytic reaction. The results of isotope experiments and H* quenching experiments confirm that H 2 O is the source of hydrogen in catalytic reduction of PNP. FeCo-N-C is identified as a superior catalyst to replace multitudinous currently used noble-metal catalysts for the selective catalytic reduction of nitroaromatics in wastewater treatment .
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Small
·
2023
·
IF 13.3
Shanxin Li,Yijing Sun,Kai Zhang,Xuzhou Jiang,Hongying Yu
High-performance electromagnetic wave (EMW) absorbers are essential for addressing electromagnetic pollution and military security. However, challenges remain in realizing cost-effectiveness and modulating absorbing properties. In this study, heterogeneous Co/nanoporous carbon (NPC) nano-islands are prepared by efficient method co-precipitation combined with in situ pyrolysis. The multi-regulation strategy of morphology, graphitization, and defect density is achieved by modulating the pyrolysis temperature. Adjusting the pyrolysis temperature can effectively balance the conductivity and defect density, optimizing the impedance matching and enhancing the attenuation. Furthermore, it facilitates obtaining the appropriate shape and size of Co magnetic nanoparticles (Co-MNPs), triggering strong surface plasmon resonance. This resonance, in turn, bolsters the synergy of dielectric and magnetic loss. The incorporation of porous nanostructures not only optimizes impedance matching and enhances multiple reflections but also improves interfacial polarization. Additionally, the presence of enriched defects and heteroatom doping significantly enhances dipole polarization. Notably, the absorber exhibits an impressive minimum reflection loss ( RL min ) of −73.87 dB and a maximum effective absorption bandwidth ( EAB max ) of 6.64 GHz. The combination of efficient fabrication methods, a performance regulation strategy through pyrolysis temperature modulation, and radar cross section (RCS) simulation provides a high-performance EMW absorber and can pave the way for large-scale applications.
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FUEL
·
2023
·
IF 7.4
Dongao Zhu,Kun Zhu,Lixian Xu,Haiyan Huang,Jing He,Wenshuai Zhu,Huaming Li,Wei Jiang
N-hydroxyphthalimide (NHPI) is a powerful green nitrogen-containing free radical catalyst, while the leaching of homogeneous NHPI remains a crucial obstacle. Herein, the cobalt-based metal–organic frameworks (Co-based MOFs) were introduced as the supports and co-catalysts to successfully confine the NHPI catalyst. NH 3 -TPD characterization confirmed that the heterogeneous catalyst NHPI@Co-MOF containing carboxyl groups linker exhibits more assertive acidity, facilitating the activation of O 2 to generate active radicals O 2 •− that determined the catalytic activity . Owing to these features, NHPI@Co-MOF-DA with two carboxyl groups as the linker achieved 98 % of DBT conversion at 120 °C. Moreover, the DBT conversion of the used catalyst reached 95 % after being recycled 10 times. The distinctive design strategy provided valuable insights into the selection of suitable organic linkers to enhance the synergistic effect of metal cobalt with NHPI in the oxidative desulfurization (ODS) process, broadening the research horizon of MOF hybrids in the construction of efficient ODS applications.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 38
·e54441
·
IF 3
Yunxiao Dong,Yong Yang,Jinggang Wang,Qianfeng Wang,Xiaoqin Zhang,Han Hu,Jin Zhu
In this work, we prepared a series of bio-based poly(butylene adipate- co -furandicarboxylate) (PBAF) copolyesters with BF segments ranging from 20 to 80 mol% through a two-step polycondensation. Then, their thermal, mechanical, gas barrier, and degradable properties were investigated. With the increase of BF content, the glass transition temperatures ( T g ) and melting temperatures ( T m ) of PBAFs increase constantly. Besides, PBAF copolyesters exhibit excellent mechanical performance with elongation at break in the range of 140% to 870%. The elastic modulus and tensile strength of PBAF60 are 138 and 17 MPa respectively, which are comparable to those of commercial poly(butylene adipate- co -terephthalate) (PBAT). Moreover, thanks to the structural characteristics of the furan ring, the barrier performances against CO 2 , O 2 , and H 2 O of PBAFs are 4.6–147.5 folds, 4.0–76.0 folds, and 0.8–8.7 folds of PBAT, respectively. Finally, the degradation tests reveal that the weight losses of PBAFs increase with decreasing BF contents. It is worth emphasizing that although the compost degradation rate of PBAF60 is slightly lower than that of PBAT, it is still a prospective alternative to PBAT due to its improved barrier properties. And it provides a possibility for applications in food packaging, mulch films, and structural elements.
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