SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Shengqiao Gao,Qingyi Wei,Hongbin Pu
Heterojunction-like substrates have drawn significant attention in surface enhanced Raman spectroscopy (SERS) owing to their multi-enhancement characteristics. In this study, the core-shell architectures of UiO-66@ TiO 2 were fabricated for capture and enrichment of organophosphorus pesticides (OPs) in solution. After absorption of OPs, the SERS-active nanoparticles of Au were assembled on the core-shell architectures to form UiO-66@TiO₂/Au substrate via Au-S bonding between OPs molecule and AuNPs and electrostatic interactions between UiO-66@TiO 2 and Au, resulting in adsorption-induced aggregation of Raman signal for OPs. The proposed method of adsorption-induced aggregation could be used for detecting thiamethoxam and triazophos in apple juice with detection limit of 3.51 μg/L and 0.66 μg/L, respectively. Furthermore, the satisfactory recovery rates, ranging from 91.98 % to 104.31 % for thiamethoxam and from 91.47 % to 116.47 % for triazophos, indicated that the prepared heterojunction-like substrate could be potentially used for trace detecting OPs in foods.
研究领域:
分析化学
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食品安全检测
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 3
·577
·
IF 3.426
Qiaoling Wang,Kaimin Chen,Yi Qu,Kai Li,Ying Zhang,Enyu Fu
Currently, it is an ongoing challenge to develop fluorescent nanosphere detectors that are uniform, non-toxic, stable and bearing a large number of functional groups on the surface for further applications in a variety of fields. Here, we have synthesized hairy nanospheres (HNs) with different particle sizes and a content range of carboxyl groups from 4 mmol/g to 9 mmol/g. Based on this, hairy fluorescent nanospheres (HFNs) were prepared by the traditional coupling method (TCM) or adsorption-induced coupling method (ACM). By comparison, it was found that high brightness HFNs are fabricated based on HNs with poly (acrylic acid) brushes on the surface via ACM. The fluorescence intensity of hairy fluorescent nanospheres could be controlled by tuning the content of 5-aminofluorescein (5-AF) or the carboxyl groups of HNs easily. The carboxyl content of the HFNs could be as high as 8 mmol/g for further applications. The obtained HFNs are used for the detection of heavy metal ions in environmental pollution. Among various other metal ions, the response to Cu (II) is more obvious. We demonstrated that HFNs can serve as a selective probe and for the separation and determination of Cu(II) ions with a linear range of 0–0.5 μM and a low detection limit of 64 nM.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Guodong Zhang,Mengting Sun,Bingjie Liu,Fei Wang
Despite confined nanospace is known as corresponding to fast hydrate kinetics, hydrate nucleation and growth mechanisms behind the promotion effect have not been thoroughly understood. Here we estimated hydrate nucleation and growth kinetics in confined porespace and proposed a new adsorption-induced two-way nanoconvection mechanism, which may constitute the essence of the confinement effect. Hydrate formation kinetics loaded by activated carbon (AC) suggest a discrete two-stage adsorption that attributes to methane physical adsorption and hydrate formation, respectively, and the promotion of methane physical adsorption on hydrate nucleation in inner pores was first presented. Impressively, the two-way convection at molecular scale gives rise to hydrate fibers, which grow out from inner pores and significantly depend on the contents of pre-adsorbed water, and this finding inversely confirms the nanoconvection mechanism. This work provides a novel perspective on improving the understanding of hydrate nucleation and growth kinetics in confined porespace and sheds light on the application of AC-based methane storage.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xinqi Luan,Xuehui Jia,Syed Jalil Shah,Jingyu Bao,Xin Yu,Ruimeng Wang,Zhongfeng Shi,Qi Pan,Liqin Zhou,Zhongxing Zhao,Zhenxia Zhao
Addressing the significant technical hurdle of efficiently capturing mixed-component volatile organic compounds (VOCs) in real-world environments is indispensable. An innovative synthesis strategy for three-dimensional high positive potential (3D-HPP) has been proposed to develop MOF composites (U66N-FT/COF) for the synergistic adsorption of toluene and formaldehyde (FA). Structural and density functional theory (DFT) simulation analyses revealed that the thiophene, amide, and amino sites in U66N-FT/COF synergistically captured FA and toluene. This phenomenon of VOCs capture occurred through π-π conjugation and electrostatic interactions, significantly reducing the competitive adsorption effect among VOCs molecules. Interestingly, the preferential adsorption of FA molecules created secondary adsorption sites for toluene molecules, thereby augmenting the adsorption capacity of toluene by 47.2 % through the dynamic and synergistic mechanism of “Adsorption-Induced-Resorption”. Furthermore, the COF unit in U66N-FT/COF acted as a hydrophobic barrier, significantly impeding the diffusion of H 2 O molecules in the pores and thus effectively weakening the competitive adsorption of H 2 O to VOCs. The experimental findings implied that the U66N-FT/COF composites possessed a remarkable synergistic adsorption activity with a total adsorption capacity of 2.15 mmol/g and a synergistic adsorption coefficient α of 1.11 for the mixed-component VOCs. This study provides an important technical approach and theoretical guidance for addressing the synergistic treatment of multicomponent VOCs in practical scenarios.
研究领域:
环境化学
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材料科学
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物理化学
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吸附科学
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大气污染控制
✓ 已验证
产品关联
DOI
高影响因子
ChemNanoMat
·
2023
·Vol. 9
·期 5
·e202300051
·
IF 3.8
Qiankun Xu,Yaru Li,Wen Ji,Jun Mei,Xianbiao Wang
Graphical TiO 2 hollow sphere/UiO-66-NH 2 heterostructures were successfully synthesized by an adsorption-induced in-situ solvothermal growth strategy. The integration of TiO 2 and UiO-66-NH 2 could construct a type-II heterojunction to broaden the absorption range of light and suppress the recombination of photoproduced electrons and holes, thus boosting the photoreduction activity toward Cr(VI) of TiO 2 /UiO-66-NH 2 . Water contamination caused by highly toxic Cr(VI) should be resolved imminently with a more efficient photocatalytic approach. The interaction between photocatalyst heterostructure is critical for charge separation which largely affects the photocatalytic efficiency. Herein, TiO 2 hollow sphere/UiO-66-NH 2 (TiO 2 /UiO-66-NH 2 ) heterostructures were successfully synthesized by an adsorption-induced in-situ solvothermal growth strategy. The UiO-66-NH 2 particles were well dispersed on TiO 2 hollow spheres by solvothermal treatment of Zr 4+ adsorbed TiO 2 hollow spheres with NH 2 -BDC ligand. The photocatalytic activities of TiO 2 /UiO-66-NH 2 heterostructures were investigated by reduction of Cr(VI) with visible light irradiation. With the introduction of UiO-66-NH 2 , the reduction efficiency toward Cr(VI) by TiO 2 /UiO-66-NH 2 heterostructures reached 89% after 180 min of irradiation, which is much higher than those of TiO 2 hollow spheres (10%) and UiO-66-NH 2 crystals (29%). Moreover, the TiO 2 /UiO-66-NH 2 heterostructures display good regeneration ability and can still maintain 70% of Cr(VI) removal ability after four cycles. The integration of TiO 2 and UiO-66-NH 2 could construct a type-II heterojunction to broaden the absorption range of light and suppress the recombination of photoproduced electrons and holes. As a result, such unique composite structure significantly enhance the photocatalytic performance towards Cr(VI) reduction. This work not only inspires a new approach for in-situ solvothermal synthesis of semiconductor@MOFs composites, but provides a novel photocatalyst for highly efficient removal of Cr(VI) from wastewater.
研究领域:
材料科学
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环境科学
·
光催化
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xiujuan Ma,Hongyan Zhang,Chu Chen
An ammonia (NH 3 ) sensor with high sensitivity based on indium-doped cerium oxide (In/CeO 2 ) was prepared by hydrothermal method , and its sensing mechanism was revealed by first-principles. Experimental results show that indium ion (In 3+ ) doping can effectually increase the sensitivity of NH 3 sensor based on CeO 2 , which is mainly attributed to the enhancement in the number of oxygen vacancies and oxygen free radicals on the surface of In/CeO 2 . In/CeO 2 sensor for NH 3 with a response value of 5412.93 at a concentration of 1000 ppm, which is 65 times that of CeO 2 sensor. Moreover, the low detection limit (LOD) of In/CeO 2 is 0.433 ppm and its response/recovery time to 5 ppm NH 3 is 1.1 s/1.4 s. Furthermore, the density functional theory (DFT) calculation confirmed that NH 3 has higher adsorption-induced charge transfer and adsorption energy on the surface of In/CeO 2 than other gases. This makes it easier for In/CeO 2 to adsorb NH 3 molecules and release more conduction electrons, thus improving the performance of In/CeO 2 . In addition, In/CeO 2 sensor can be effectively used to detect the freshness of tofu through the concentration of NH 3 released by the tofu in different storage environments. This work is beneficial to the safety monitoring of high protein food.
研究领域:
材料科学
·
传感器
·
食品安全
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）