Journal of Materials Chemistry A
·
2025
·
IF 9.5
Huimin Zhang,Yu Liu,Qi Li,Xinlu Zhao,Mingze Sun,Jiaxin Hou,Chuanyu Guo,Chaobo Huang,Xiaoli Cheng,Lihua Huo,Minghui Yang,Yingming Xu
High-performance humidity sensors have significant potential applications in areas such as smart homes and digital healthcare, but the limited humidity sensing performance of materials hinders their practical application. One major challenge in enhancing the sensing performance of humidity-sensitive materials is the effective regulation of oxygen vacancy content within their crystal structures. In this study, we propose a dual regulation strategy of “ligand induced-pyrolysis synergy” to control the oxygen vacancy content effectively. Specifically, Metal–Organic Framework (MOF) materials containing oxygen vacancies were synthesized using a monocarboxylic acid conditioning method. We further increased the oxygen vacancy content in the MOF derivatives by adjusting the heat treatment temperature. The prepared U6C-20-400 sensor demonstrated excellent performance across a wide humidity range of 3–97% relative humidity (RH), with a rapid response/recovery time of just 0.5 s and 1.2 s. Furthermore, it effectively monitored food as it transitioned from raw to cooked and even burnt during cooking. This study offers valuable insights for developing high quality humidity sensors tailored for next-generation smart home applications.
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RSC Advances
·
2026
·Vol. 16
·期 2
·1202-1211
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IF 4.6
Qiuyun Huang,Shiyu Liu,Weihua Shen,Yunjin Fang
For the carbonylation of methyl nitrite (MN) to dimethyl carbonate (DMC), a series of Ce(x)-UiO-66 were synthesized and utilized as supports for Pd/Ce(x)-UiO-66 catalysts. The characteristics of the carriers were investigated using XRD, SEM, TG, NH3-TPD and BET analyses. The results showed that doping cerium in the UiO-66 significantly enhanced the catalytic activity by improving the surface area, acidity and CO adsorption of the catalysts. Ce(0.1)-UiO-66, with the highest thermal stability (547.26 °C), presented the highest catalytic stability in DMC synthesis. It was proven that the damage of CO and the migration of Pd atoms occurred due to the replacement of ligands and metal clusters, which led to catalytic deactivation.
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Desalination and Water Treatment
·
2024
·
IF 1
Sheng Feng,Guiliang Zhu,Lili Cao,Runbai Wang,Shuguang Liu
In the work, the layered TiO 2 NS/UiO-66/GO composites were successfully prepared through an in-situ method. Two-dimensional TiO 2 NS combined with UiO-66/GO to form a layered structure. The prepared samples were characterized by X-ray diffraction, thermogravimetric analysis, Brunauer–Emmett–Teller test, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, UV–Vis DRS and PL spectra. TiO 2 NS/40%UiO-66/GO exhibited the most efficient adsorption (20 and 1.3 times those of TiO 2 NS and UiO-66/GO, respectively) through absorbing Congo red (CR). It also displayed the strongest photocatalytic activity (29 and 2 times those of TiO 2 NS and UiO-66/GO, respectively) for degrading CR dye under visible-light irradiation (λ ≥ 420 nm). The removal rate of CR was nearly 100%. Besides, TiO 2 NS/40%UiO-66/GO showed excellent stability even after four cycling runs of adsorbing and photodegrading CR. The results showed that TiO 2 NS/UiO-66/GO composites were highly efficient adsorption and catalytic bifunctional materials. TiO 2 NS/UiO-66/GO composites provide an important basis for combining metal organic frameworks/GO with photocatalytic semiconductors to improve absorption and photocatalytic performance to better treat organic wastewaters.
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CHEMICAL ENGINEERING JOURNAL
·
2020
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IF 10.652
Liangjie Wang,Xianghua Wen,Juan Li,Ping Zeng,Yonghui Song,Huazhong Yu
Recently, UiO-66 type metal organic frameworks (MOFs) have been studied as adsorbents for phosphate removal from wastewater; however, the adsorption mechanism with different concentrations of phosphate, especially the roles of defects and linker exchange, are not entirely clear. In this work, the phosphate adsorption mechanism in HCl-UiO-66 and HCl-NH 2 -UiO-66 were examined by testing the relationship between the adsorbed phosphate and released linker in the adsorption process. Adsorption kinetics studies (3.0 mM phosphate solution) and adsorption isotherm analyses (0.3–6.0 mM phosphate solution) revealed highly linear relationships (R 2 = 0.8949–0.9978) between the adsorbed phosphate and released linker for both adsorbents. Further analysis showed that when the adsorbed phosphate was lower than 0.56 mmol/g for HCl-UiO-66 and 0.51 mmol/g for HCl-NH 2 -UiO-66, phosphate was preferentially adsorbed on the defect sites in the MOFs with no linker release. However, when the adsorbed phosphate exceeded these levels, the defects were saturated by phosphate and linker exchange became the major adsorption mechanism. Based on density functional theory calculations, the obtained strengths of the linkers (H 2 BDC: Terephthalic acid; NH 2 -H 2 BDC: 2-Aminoterephthalic Acid; NO 2 -H 2 BDC: 2-Nitroterephthalic Acid) and phosphate species as Lewis bases fall in the order, PO 4 3- > HPO 4 2- > NH 2 -BDC 2- > BDC 2- > H 2 PO 4 - > NO 2 -BDC 2- > H 3 PO 4 , which clearly evidences why linkers can be exchanged by phosphate. Given the propensity for ligand exchange and the resulting structural destabilization, UiO-66 type MOFs is not suggested as ideal adsorbents for phosphate removal from wastewater with high phosphate concentrations.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 3.9
Dong Mingming,Yang Shuyong,Wang Anshun,Zhou Peng,Huang Zewen,Tu Shenghui
A ternary Z-scheme heterojunction photocatalyst, BiOBr/TiO 2 /NH 2 -UiO-66(Zr), was constructed to enhance the visible-light-driven degradation of tetracycline (TC). This composite material was synthesized via hydrothermal and in situ growth methods, and its microstructure and properties were analyzed through a series of systematic characterizations. The introduction of NH 2 -UiO-66 significantly increased the specific surface area and visible light absorption while promoting the separation and transport of photogenerated charge carriers. Under visible light irradiation, the optimal composite (BTU-2) achieved a TC degradation rate of 96.3% within 80 min, with a reaction rate constant 9.41, 12.03, and 8.58 times higher than those of pure BiOBr, TiO 2 nanowires (NWs), and NH 2 -UiO-66, respectively. Trapping experiments and electron paramagnetic resonance (EPR) analysis confirmed that h + and ‧O 2 − were the dominant active species. Liquid chromatography–mass spectrometry (LC–MS) further elucidated the possible TC degradation pathways. This work provides a feasible strategy for designing efficient visible-light-responsive photocatalysts for antibiotic wastewater treatment. Graphical abstract
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Jun Chen,Kai Jiang,Tianxiang Hang,Ciyang Zhang,Ruijie Che,Mingzhu Xia,Wu Lei
A covalently coupled CdTe/NH₂-UiO-66(Eu) ratiometric probe was developed. • Adsorption experiments and IGM analysis indicated rapid glyphosate uptake mediated by multiple interfacial interactions. • Glyphosate enhanced blue emission and weakened green emission for ratiometric readout. • Lifetime, XPS, and TD-DFT analyses provided mechanistic insights into the fluorescence response. Rapid detection and effective adsorptive capture of glyphosate from water are important for aquatic environmental monitoring and agricultural product safety. To address the susceptibility of single-emission fluorescence signals to external fluctuations and the limited glyphosate-capture capability of conventional fluorescent probes, a dual-emission platform integrating glyphosate adsorption with ratiometric fluorescence detection was constructed through the covalent interfacial assembly of Eu 3+ -modified NH 2 -UiO-66 and mercaptopropionic acid-modified CdTe QDs. Adsorption experiments and independent gradient model (IGM) analysis indicated that the composite exhibited rapid glyphosate uptake mediated by multiple interfacial interactions. In the presence of glyphosate, CdTe/NH 2 -UiO-66(Eu) exhibits enhanced blue emission at 434 nm and weakened green emission at 524 nm, producing a pronounced I 434 /I 524 ratiometric response. The fluorescence intensity ratio shows a linear dependence on glyphosate concentration over the range of 0.5–80 μM, with a limit of detection of 0.217 μM. Based on fluorescence lifetime results and XPS analysis, the ratiometric fluorescence response mechanism of the probe was elucidated. TD-DFT calculations further suggested that glyphosate modifies the excited-state charge distribution and charge-transfer characteristics associated with the MOF component. This work provides an interfacial assembly strategy for constructing MOF-based platforms that combine adsorptive glyphosate capture with ratiometric fluorescence sensing. Download: Download high-res image (182KB) Download: Download full-size image
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 21
·60574-60589
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IF 5.8
Zhang Xiaoting,Liu Yang,Qu Lingbo,Han Runping
In this study, a green adsorbent (Fe 3 O 4 -UiO-66-NH 2 ) with the ability of addressing the issues of separation and recovery of UiO-66-NH 2 is obtained using a simple co-precipitation method under environmentally benign conditions. Various characterization techniques are utilized for evaluating the properties of the developed adsorbent. The capability of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-dichlorophenoxyacetic acid (2,4-D) and glyphosate (GP) from solution is explored. The results revealed that the magnetization process did not destroy the crystal structure of UiO-66-NH 2 , which ensured that Fe 3 O 4 -UiO-66-NH 2 had good adsorption performance for 2,4-D and GP. The adsorption processes showed a wide pH application range, high salt tolerance, and regeneration performance as well as an excellent adsorption rate. Results from thermodynamic study showed that both processes were spontaneous and endothermic. The unit uptake ability of Fe 3 O 4 -UiO-66-NH 2 for 2,4-D and GP reached up to 249 mg·g −1 and 183 mg·g −1 from Langmuir model at 303 K, respectively. When solid–liquid ratio was 2 g·L −1 , Fe 3 O 4 -UiO-66-NH 2 can reduce the content of 2,4-D or GP with the initial density of 100 mg·L −1 below the drinking water requirement limit. In addition, the reusability efficiency of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-D and GP was found to be 86% and 80% using 5 mmol·L −1 NaOH as eluent. Analysis of simulated water samples indicated that Fe 3 O 4 -UiO-66-NH 2 could achieve the single or simultaneous removal of 2,4-D and GP from wastewater. Summarily, Fe 3 O 4 -UiO-66-NH 2 as a green adsorbent can serve as an alternative for removing 2,4-D and GP from water body.
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MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Hongbin Pu,Yuting Xie,Qingyi Wei,Da-Wen Sun
SERS sensors based on metal-organic frameworks (MOFs) have garnered considerable attention in trace pesticide residue detection. UiO-66/AuNPs suspension substrates were fabricated by introducing thioglycolic acid (TGA) as a binder to modify the surface of AuNPs to facilitate their electrostatic assembly with UiO-66 prepared through hydrothermal reaction. The proposed substrates were used for quantitative and simultaneous analysis of paraquat and diquat in cabbage. Diquat and paraquat in actual cabbage samples were individually analysed with detection of limits (LOD) of 6 μg/L and 3 μg/L, respectively, and validated with recoveries ranging from 92.65 to 118.34%. Furthermore, the UiO-66/AuNPs substrate was able to differentiate between paraquat and diquat mixtures, even for the concentrations in the cabbage extracts differed by a factor of 100. The proposed UiO-66/AuNPs substrate provides a potentially useful tool for the trace determination of pesticide residues in the practical food safety analysis
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhitong Xu,Ye Qi,Yueguang Fang,Peng Tian,Guiling Ning,Junwei Ye
Core-shell Fe 3 O 4 @UiO-66-NH 2 nanospheres with superior photocatalytic activity and photo-Fenton performance were synthesized using a layer-by-layer growth strategy. The synthesis involved the use of FeCl 3 , trisodium citrate, sodium acetate, ZrCl 4 , and 2-aminoterephthalic acid as raw materials, with mercaptoacetic acid serving as a modifier. Fe 3 O 4 @UiO-66-NH 2 demonstrated improved visible-light-driven photocatalytic performance in the oxidation degradation of Rhodamine B (RhB) in the presence of trace amounts of H 2 O 2 under visible light irradiation. The Fe(II)/Fe(III) cycle was accelerated by the transfer of the photogenerated electrons (e-) from UiO-66-NH 2 to Fe 3 O 4 , which in turn encouraged the Fenton reaction to produce hydroxyl radicals (•OH). With only 10 mmol/L H 2 O 2 , the removal rate of RhB approached 94% in 120 min. Furthermore, when exposed to visible light, Fe 3 O 4 @UiO-66-NH 2 exhibited 99% efficacious antibacterial activity against Escherichia coli and Staphylococcus aureus . Overall, the as-prepared Fe 3 O 4 @UiO-66-NH 2 core-shell nanospheres show promise for practical applications as photocatalysts for the degradation of organic pollutants and the inactivation of bacteria in wastewater.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 24
·1-17
·
IF 2.8
Fan Yan,Wang Lei,Sun Xueqin,Li Cuili,Liu Jiacheng
A series of UiO-66-NH 2 -CA-Cu/g-C 3 N 4 (UCC 1 /CN x ) heterogeneous photocatalysts were constructed via a facile physical mixing treatment of the covalently post-modified MOF (UiO-66-NH 2 -CA-Cu) and functional materials g-C 3 N 4 . The tetracycline removal by the photocatalysis coupled with persulfate activation were studied under white light irradiation. The optimal UCC 1 /CN 20 photocatalyst showed the best photocatalytic performance, in which 94.0% TC could be efficiently eliminated ( k = 0.08669 min −1 ) within 30 min. The satisfactory degradation performance could be ascribed to the effective separation of photogenerated electron-hole pairs over the heterogeneous binary structure, which were demonstrated by several characteristic technologies including photoluminescence spectra, electrochemical impedance spectroscopy, transient photocurrent response and Bader charge analysis based on density functional theory calculations. Moreover, a possible mechanism behind the photocatalytic degradation was proposed and further affirmed by the quenching experiments and electron spin resonance measurements. Our work may supply a feasible idea for treating wastewater contained organic pollutants based on the heterogeneous photocatalyst.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Wei He,Xiaoqing Li,Zhengxin Qian,Zhen Liu,Zhenghua Tang
Developing dual functional electrocatalyst for both oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) is critical for promoting energy conversion efficiency in fuel cells and metalair batteries, and produce hydrogen with high purity. Herein, PdAg bimetallic nanoparticles encapsulated in porous carbon have been prepared and utilized as effective electrocatalysts for both ORR and HER. The surface microstructure, crystal structure, as well as electronic charge states of the bimetallic particles encapsulated in porous carbon were studied by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS), respectively. In the bimetallic PdxAg100-x (x represents the initial atomic Pd ratio in PdAg alloys) series, the Pd50Ag50 sample exhibited the best performance, of which its ORR activity and long-term stability were superior to Pd/C in alkaline media along with its HER performance was comparable with Pd/C in acid solution. The study provides a reliable method for fabricating carbon substrate supported bimetallic alloys with good activity and robust stability toward ORR, HER and beyond.
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CHEMOSPHERE
·
2023
·
IF 8.8
Guizhen Li,Yao Zhang,Xinyu Hu,Wei Tan,Jiaxiong Li,Daiyan Su,Hongbin Wang,Min Yang
In the present study, Ni-UiO-66 was synthesized to improve the adsorption efficiency of tetracycline (TC) in wastewater treatment . To this end, nickel doping was performed in the preparation process of UiO-66. The synthesized Ni-UiO-66 was characterized by XRD , SEM and EDS, BET, FTIR, TGA , and XPS for obtaining the lattice structure, surface topography, specific surface area, surface functional groups, and thermostability. More specifically, Ni-UiO-66 has a removal efficiency and adsorption capacity of up to 90% and 120 mg g −1 , respectively, when used to treat TC. The presence of ions HCO 3 − , SO 4 2− , NO 3 − and PO 4 3− slightly affects the TC adsorption. A 20 mg L −1 humic acid reduces the removal efficiency from 80% to 60%. The performed analyses revealed that Ni-UiO-66 had similar adsorption capacity in wastewater with different ion strengths. The variation of adsorption capacity with the adsorption time was fitted using a pseudo-second-order kinetic equation . Meanwhile, it is found that the adsorption reaction occurs only on the monolayer of the UiO-66 surface so the adsorption process can be simulated using the Langmuir isotherm model. The thermodynamic analysis indicates that the adsorption of TC is an endothermic reaction . Electrostatic attraction, hydrogen-bond interaction, and π-π interaction might be the main reasons for the adsorption. The synthesized Ni-UiO-66 has well adsorption capacity and stable structure. Accordingly, it is expected to achieve a good prospect in industrial applications and wastewater treatment plants .
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