Analytical Methods
·
2022
·Vol. 14
·期 32
·3079-3086
·
IF 3.532
Shuang Han,Ruonan Sun,Fu Teng,Yuan Wang,Hongtao Chu,Wei Zong,Yao Chen,Zhonghui Sun
p-Cresol is a harmful phenolic substance that can cause serious effects on human health even at a low concentration in water. Therefore, the detection of p-cresol in a water environment is particularly important. In this paper, a novel zeolite imidazolate framework-67 (ZIF-67) material with regular morphology was prepared on the surface of graphene oxide doped with silver nanoparticles. The composite was modified on the glassy carbon electrode surface to increase the specific surface area, accelerate the electron transfer rate, enhance the current response and improve the performance of electrochemical sensors. Furthermore, a layer of p-cresol-molecularly imprinted polymer was prepared on the surface of the modified electrode by electropolymerization for the selective, rapid and sensitive detection of p-cresol, which greatly improved the specific recognition of p-cresol. Under optimal conditions, the prepared sensor had a good linear range of 1.0 × 10−10 M to 1.0 × 10−5 M with a detection limit as low as 5.4 × 10−11 M, and it presented excellent reproducibility, stability and selectivity. Moreover, the sensor was successfully applied for the detection of trace p-cresol in a real water environment, providing a reliable assay for sensitive, rapid and selective detection of p-cresol in complex samples.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lixiang Zhang,Luping Feng,Pan Li,Xi Chen,Jiatian Jiang,Sheng Zhang,Chunxian Zhang,Anchao Zhang,Guofu Chen,Hua Wang
A visible-light-driven photoelectrochemical (PEC) sensor has been developed for probing Hg 2+ with “turn-on” signal output using hollow CoS x @CdS polyhedron as direct Z-scheme photocatalyst and Hg 2+ -recognition probe. The CoS x @CdS heterojunction photocatalysts were fabricated by growing CdS nanoparticles on the surface of cobalt sulfide (CoS x ) via one-pot solvothermal route using metal-organic frameworks (MOFs) of ZIF-67 polyhedrons as the sacrificial templates and cobalt precursors. It was discovered that the photocurrent responses of the CoS x @CdS-modified ITO electrodes could be specifically turned on by Hg 2+ , in contrast to these of the CoS x or CdS-modified ones showing no significant Hg 2+ -induced photocurrent. Under visible light irradiation, herein, the synergetic combination of CoS x and CdS components could improve the carriers transferring of PEC system. More importantly, the photocurrents of the PEC sensor could be greatly enhanced in the presence of Hg 2+ through the selective ion-exchange reaction to trigger the in-situ formation of a new Z-scheme heterojunction of CoS x @CdS/HgS photocatalysts, achieving the further promoted charge transferring and suppressed recombination of photogenerated electron-hole pairs. The developed double heterojunctions-based PEC sensors can detect Hg 2+ with the concentrations ranging from 0.010 to 1000 nM, which performances are much better than those of the current PEC analysis methods. Besides, such a MOF-templated one-pot construction route may pave the way toward the design of various direct Z-scheme heterojunction photocatalysts of PEC probes of great interest.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Yingying Xu,Xiangmei Meng,Tianhao Zou,Jianqiao Wang,Pengfei Xiao
Chloroquine phosphate (CQP) is a drug widely used in clinical anti malaria and treatment of novel coronavirus pneumonia. Meanwhile, it has persistence in water. This substance has become a new type of environmental pollution that requires urgent attention and effective remediation strategies. Therefore, in this study, nickel molybdenum layered double hydroxide (NixMoy-LDH) was coated on ZIF-67 through hydrothermal treatment and used as a catalyst to activate CaSO 3 for the degradation of CQP. Investigated the effects of catalyst ratio, initial pH, and coexisting substances in the system on the degradation of CQP. Under the optimal metal ratio synthesis conditions, NiMo4-LDH@ZIF-67/CaSO 3 achieved a 95.6% CQP degradation rate within 30 min, demonstrating excellent activity. Comprehensive characterization shows that the close interaction between ZIF-67 and NixMoy-LDH can improve the stability of the catalyst, accelerate the redox cycle of Ni ions, and enhance the activation of CaSO 3 . Quenching experiments, electron paramagnetic resonance, and competitive dynamics confirm that SO 4 •− , •OH and 1 O 2 , species contribute to the degradation process. By combining LC-MS and DFT calculations, the possible degradation pathways of CQP were analyzed, the main intermediates were identified, and the toxicity of the intermediates was evaluated. It is worth noting that after five cycles, the degradation rate of pollutants by the catalyst remained at 93%, proving that the catalyst has excellent stability. The catalyst has excellent reusability and effectiveness in various pollutants and different water bodies. This work emphasizes that the NiMo4-LDH@ZIF-67/CaSO 3 system is a promising pharmaceutical wastewater treatment technology.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhenfei Liu,Dingding Ye,Xun Zhu,Shaolong Wang,Yanan Zou,Linghan Lan,Rong Chen,Yang Yang,Qiang Liao
Non-precious metal materials are considered as the most promising catalysts for oxygen reduction reaction (ORR) due to their high catalytic activity, low cost, superior stability as well as good electrocatalytic selectivity. Here, in situ encapsulation of Co nanoparticles into N-doped porous carbon (Co@NPC) nanocages interconnected by carbonized multi-walled carbon nanotubes (C-MWCNTs) are prepared through direct carbonization of the MWCNTs-based ZIF-67 precursor. The obtained hybrid material (denoted as Co@NPC/C-MWCNTs) displays an excellent ORR performance with a half-wave potential of 0.79 V, effective four-electron transfer and superior formate-tolerance ability. The superior ORR activity of the Co@NPC/C-MWCNTs hybrids is mainly ascribed to the abundant catalytic active sites contributed by the Co@NPC nanocages, the high electrical conductivity and large specific surface area rooting in C-MWCNTs, and synergetic effects between Co@NPC nanocages and C-MWCNTs. The membraneless flexible direct formate fuel cell (DFFC) using Co@NPC/C-MWCNTs as the cathode catalyst delivers a peak power density of 4.32 mW cm −2 stably. Notably, the performance of the flexible DFFC can still maintain 90.9% of its initial value after repeated bending for 1000 times. Moreover, two flexible DFFCs connected in series mode can easily power some low-power electronics. The report not only opens a new door to design high-performance non-precious metal ORR catalysts for DFFCs, but also greatly boosts the development of flexible energy conversion and storage devices.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2020
·
IF 3.004
Xiangrong Wu,Beibei Qiu,Yanan Chen,Yuqiong Shi,Jinhua Zhu,Xiuhua Liu,Dongbao Zhao
In this work, α-glucosidase was immobilized on a type of nanoscaled magnetic materials Fe 3 O 4 @ZIF-67 to construct a biomicroreactor for rapid screening α-glucosidase inhibitors. The parameters that affected the immobilization efficiency were investigated. Under optimal conditions, the amount of α-glucosidase loaded was up to 79.07 μg·mg −1 . Then, the enzyme biomicroreactor was immobilized by an external magnetic field in a tube connecting HPLC and micro-injection pump at both ends to form a magnetic online screening system. The screening flow rate and eluent organic solvent ratio during the screening process were optimized. XinYang MaoJian crude tea extract was tested to verify this online screening method, and three inhibitors (catechin, epigallocatechin gallate and epicatechin gallate) were fished by this magnetic online screening system. Based on the classical p NPG method, the inhibitory activities on α-glucosidase were further verified and studied. Compared with the traditional ligand fishing methods, the screening method established in this work can integrate screening, elution and analysis. It can simply, efficiently and directly screen and identify potential α-glucosidase inhibitors from natural sources. This method was expected to provide an effective basis for accelerating the development of new hypoglycemic drugs.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Niu Liu,Jun Cheng,Wen Hou,Xiao Yang,Junhu Zhou
In order to form strengthened active sites for superior CO 2 adsorption on core shell ZIF-8@ZIF-67 nanocomposites , graphene oxide (GO) with oxygen-containing functional groups was used as support to synthesize hybrid adsorbents with unsaturated Zn–N 2 –O active sites. The results of XPS O 1s and FTIR analysis revealed that the Me–O functional group content in the 0.5 wt% graphene oxide (GO)-supported core shell ZIF-8@ZIF-67 nanocomposite (38.9 at.%) was much higher than that in the 0.5 wt% reduced graphene oxide (RGO)-supported nanocomposite (19.4 at.%). This was because hydroxyl functional groups in the GO formed coordination bonds with zinc atoms in core shell ZIF-8@ZIF-67. XPS N 1s spectra indicated that the incorporation of oxygen-containing functional groups in GO resulted in the transition of binding form from Me–N 4 to Me–N 2 . The CO 2 adsorption capacity of GO-supported core shell ZIF-8@ZIF-67 gradually decreased from 2.15 to 1.30 mmol/g as GO weight percentage increased from 0.5 to 4 wt%, which was consistent with the decrease in BET surface area from 1378 to 585 m 2 /g and increase in peak pore diameter from 7.7 to 8.2 Å. Density functional theory (DFT) calculations demonstrated that unsaturated Zn–N 2 –O active sites in GO-supported core shell ZIF-8@ZIF-67 nanocomposites resulted in a decreased O C⋯Zn interaction distance from 4.65 (Zn–N 4 sites in core shell ZIF-8@ZIF-67) to 3.46 Å and an increased binding energy from 34.02 to 38.87 kJ/mol. Therefore, 0.5 wt% GO-supported core shell ZIF-8@ZIF-67 nanocomposites exhibited the highest CO 2 adsorption capacity of 2.15 mmol/g (at 273 K and 1 bar), 1.34 times higher than that of core-shell ZIF-8@ZIF-67.
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Materials Today Communications
·
2025
·
IF 4.5
Zhe Tu,Hongxiang Ou,Yining Ran,Honglai Xue,Fang Zhu
The synthesis of a multifunctional flame retardant that combines flame retardancy, smoke suppression, and toughening effects is essential for expanding the range of applications for polyolefins. Inspired by the superhydrophobicity and low surface energy due to the lotus leaf micro/nano hierarchical structure, in this paper, we constructed 2D-3D heterogeneous ZIF-67@MMT by growing ZIF-67 in situ on the surface of montmorillonite (MMT) layers using wet chemistry. Mismatch engineering and micro/nano-graded heterogeneous structure confer high dispersibility and a high specific surface area on MMT, thus optimizing the pore structure and catalytic activity. Polypropylene (PP) composites with 25 wt% intumescent flame retardant (IFR) and 3 wt% ZIF-67@MMT achieved a 32.1 % limiting oxygen index and a UL-94 V-0 rating. 3ZIF-67@MMT/IFR/PP showed a 93 %, 86 %, and 66 % reduction in peak heat release rate, total smoke production, and CO production, respectively. In addition, ZIF-67@MMT has good interfacial compatibility and mechanical interlocking with PP. The tensile strength and elongation at break of 3ZIF-67@MMT/IFR/PP were increased by 58 % and 64 %, respectively, compared to 2MMT/IFR/PP. This work provides an effective strategy for the design of multifunctional heterogeneous nanomaterials for fire safety and other potential applications.
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DESALINATION
·
2025
·
IF 9.8
Na Yang,Xu Guo,Jing Yu,Hongsen Zhang,Rumin Li,Lele Wang,Qi Liu,Jun Wang
The effective removal of radioactive Sr 2+ and Cs + ions from wastewater is crucial for environmental remediation. Herein, a novel solar-enhanced adsorption platform based on a CoS 2 /MoS 2 /P-MXene/C composite aerogel has been developed that can efficiently remove Sr 2+ and Cs + ions. The constructed CoS 2 /MoS 2 heterointerface provides abundant active regions, while the hierarchical porous structure of the aerogel promotes the rapid transfer of ions and water molecules. In particular, the superior photothermal conversion ability of the CoS 2 /MoS 2 /P-MXene/C makes it capable of capturing solar energy for local heating effect, thereby increasing ion diffusion and accelerating mass transfer. This photothermal feature can greatly enhance the adsorption kinetics through the evaporation of the solution and the ion concentration at adsorption sites. The equilibrium of both Sr 2+ and Cs + was reached within 1 h under one-sun illumination. The measured maximum adsorption capacities were 98.7 and 150.6 mg/g for Sr 2+ and Cs + ions, respectively. In addition, it has excellent selectivity and recyclability as well as high performance in high-salinity solution. The CoS 2 /MoS 2 /P-MXene/C also shows promising potential in the fields of solar-driven seawater desalination and purification of wastewater containing dyes due to the multi-functionality. This work not only engineers an efficient adsorbent for treating nuclear wastewater, but also presents a generic design strategy for multifunctional adsorption system enhanced by external fields for environmental applications.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Tingting Yu,Shaobin Li,Li Zhang,Fengbo Li,Jianxin Wang,Hong Pan,Deqing Zhang
Designing dual-functional electrode materials for supercapacitors and pollutant sensors has attracted great interest from researchers for urgent demand in green energy and the environment. In this work, a novel electrode material V 2 CT x @NiCoMn-OH was successfully constructed for dual-functional orientation via a two-step synthesis strategy, in which the NiCoMn-OH with a three-dimensional (3D) hollow structure was fabricated by employing ZIF-67 as a template and simple anion exchange and composited with the two-dimensional (2D) layered V 2 CT x MXene. The intercalation of NiCoMn-OH can effectively limit the self-accumulation of V 2 CT x MXene nanosheets and build a 3D cross-linked hollow structure, thereby broadening the ion transport channel, exposing more active sites of V 2 CT x @NiCoMn-OH, and simultaneously improving the conductivity of NiCoMn-OH. Benefiting from the unique 3D cross-linked hollow structure, the optimized V 2 CT x @NiCoMn-OH-20 electrode material exhibits an excellent specific capacitance of 827.45 C g −1 at 1 A g −1 . Furthermore, the electrode material has excellent capacitance retention of 88.44% after 10,000 cycles. Moreover, the V 2 CT x @NiCoMn-OH-20//AC ASC device displays a high energy density of 88.35 Wh kg −1 as well as high power density of 7500 W kg −1 during operation. Additionally, the V 2 CT x @NiCoMn-OH-20 exhibited excellent electrocatalytic performance in the detection of hydroquinone, including the low detection limit of 0.559 μM (S/N = 3) and the wide linear range of 2–1050 μM. Therefore, the prepared V 2 CT x @NiCoMn-OH-20 has great potential applications in the fields of supercapacitors and hydroquinone sensors.
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高影响因子
Energy Technology
·
2024
·Vol. 12
·期 3
·2301166
·
IF 3.6
Yanyi Liu,Jian Wei,Xinyu Qiao,Xueting Li,Hao Zhang,Houfei Xiong
Lithium–sulfur (Li–S) batteries are favored as ideal batteries for next-generation electrical stored energy systems owing to their high theoretical energy diversity and low operating costs. Therefore, the development of Li–S batteries with excellent rate capability and stable cycling is still a challenge. In this article, the electrochemical performance of lithium–sulfur batteries with high capacity and long cycle stability is achieved through dual physical and chemical adsorption effects using polypyrrole (PPy) attached to Co 3 O 4 /TiO 2 heterojunction structures based on metal–organic frameworks (MOFs) backbone materials. Co 3 O 4 /TiO 2 polyhedra form a built-in electric field, which is also a good adsorbent for polysulfides PPy nanotubes have a vacant structure, thus minimizing the volume expansion during deformation and maintaining the stability of the structure. The reversible specific capacities of lithium–sulfur batteries prepared based on Co 3 O 4 /TiO 2 /PPy electrodes are 1095 and 739.4 mAh g −1 at 0.1 C and 1 C multiplicity, respectively, and the capacity retention rate is 77.84% after 500 cycles at 1 C multiplicity. The structural design of the S@Co 3 O 4 /TiO 2 /PPy anode demonstrates an excellent ability to limit LiPS and has great potential to provide a promising avenue for the practical application of lithium–sulfur batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Chenhan Xiong,Wei Cao,Jiaqi Chen,Yanqiu Yu,Xinming Lian,Rui Xue,Nan Chen,Zhaoyang Fan,Guoping Du
Designing rational heterostructures of high-performance electroactive materials on conductive substrates with hierarchical structures is critical for advancing electrochemical energy storage technologies. In this study, a unique spatial structure is fabricated by vertically aligning two-dimensional (2D) structures of Co-ZIF-L on conductive nickel foam (NF) substrate through interruption of ZIF-67 formation. This is followed by an innovative electrochemical synthesis method that disrupts unstable surface coordination bonds in Co-ZIF-L, enabling the in-situ generation of Co(OH) 2 . The resulting Co(OH) 2 @ZIF-L/NF binder-free electrodes feature a hierarchical spatial structure and are synthesized in approximately 30 s. These electrodes showcase exceptional area capacity of 3.1 C cm −2 at 1 mA cm −2 , attributed to their high specific surface area and layered architecture that promotes electrolyte penetration. Density Functional Theory (DFT) calculations reveal that the Co(OH) 2 @ZIF-L nanostructures have superior electrical conductivity compared to the individual components. Furthermore, a hybrid supercapacitor (HSC) based on Co(OH) 2 @ZIF-L/NF//AC exhibits an impressive energy density of 42 Wh kg −1 at a power density of 184.7 W kg −1 . This research provides new insights into the efficient synthesis of high-performance electroactive materials with unique spatial structures and expands the potential applications of ZIF materials.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Shuang Liu,Chao Liu,Hejiao Zhang,Weizhen Zhang,Wei Ding,Huaili Zheng,Hong Li
The sulfite (S(IV))-based advanced oxidation process (AOP) has emerged as an appealing alternative to the traditional persulfate-based AOP for the elimination of organic contaminants from diverse water matrices. In this work, a silica reinforced ZIF-67(Co) catalyst (CZS) is fabricated, characterized and tested in the activation of S(IV) for the sulfamethoxazole (SMX) degradation. The prepared CZS demonstrates superior stability and catalytic ability for the degradation of SMX compared to ZIF-67(Co) across a broad pH range. Unlike the conventional radical-dominated oxidation systems, the CZS/S(IV) system for SMX degradation operates through a non-radical mechanism, featuring high-valent Co(IV) and singlet oxygen ( 1 O 2 ) as the predominated reactive species. The hydroxylated Co species exposed on the CZS surface is identified as the pivotal active site, realizing the S(IV) activation through a complexation-electron transfer process, resulting in the production of various reactive intermediates. Co(II) undergoes the conversion to Co(IV) by generated HSO 5 − , and 1 O 2 predominantly originates from the intermediate SO 4 •− . Profiting from the highly selective oxidation capacities of Co(IV) and 1 O 2 , the established oxidative system demonstrates a remarkable interference resistance and exhibits an exceptional decontamination performance under real-world water conditions. In short, this work provides a sustainable S(IV)-based oxidation strategy for environmental remediation via non-radical mechanism.
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危险品化学品经营许可证（带存储）