MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 5
·1-8
·
IF 5.705
Wang Zonghua,Yu Gege,Xia Jianfei,Zhang Feifei,Liu Qingyun
The authors demonstrate the exploitation of reduced graphene oxide (RGO) as a template for immobilizing zeolitic imidazolate framework-8 (ZIF-8) crystals loaded with the electrochemical probe Methylene Blue (MB). The framework was deposited on the surface of RGO in a one-pot process. Transmission electron microscopy, scanning electron microscopy and X-ray diffraction were employed to characterize the nanocomposite. The electrochemical behavior of rutin at a glassy carbon electrode (GCE) modified with the nanocomposite was investigated by cyclic voltammetry and differential pulse voltammetry. The modified GCE displays high electrocatalytic activity toward rutin oxidation at a relatively low working potential (0.4 V vs. Ag/AgCl). Under the optimal conditions, the sensor has an amperometric response that is linear in the 0.1 to 100 μM rutin concentration range, with a 20 nM detection limit (at an S/N ratio of 3). The method was successfully applied to the determination of rutin in tablets and urine samples.
The zeolitic imidazolate framework ZIF-8 was loaded with Methylene Blue and deposited on the surface of reduced graphene oxide. A glassy carbon electrode was modified with the nanocomposite and then used for the determination of rutin with a 20 nM detection limit and a linear range from 0.1 to 100 μM.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 35
·15876-15886
·
IF 3.591
Xiao Zhang,Zhiyue Li,Taoyi Zhang,Jing Chen,Wenxi Ji,Yun Wei
A novel zeolitic imidazolate framework-8 (ZIF-8) alginate composite hydrogel material (PVA/SA@ZIF-8) is an alginate composite bead which was fabricated by grafting ZIF-8 on the surface of the sodium alginate hydrogel beads using an in situ growth method. The synthetic material was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, high resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. The PVA/SA@ZIF-8 bead was used to effectively adsorb Cu(II) from aqueous solutions. The initial concentration of copper ions, adsorbent dose, initial pH of copper ions solution, temperature, and contact time for the synthesis of the material were optimized. The adsorption isotherms and kinetics fitted to the Langmuir isotherm model (R2 = 0.9992) and the pseudo-second-order kinetic model (R2 = 0.9967) respectively. According to the Langmuir isotherm adsorption model, the maximum theoretical adsorption capacity of the adsorbent for Cu(II) was 166.94 mg g−1. In addition, the recycling application of the adsorbent was possible as it was easily collected and reused after five adsorption-regeneration cycles. The results indicated the PVA/SA@ZIF-8 hydrogel has unlimited potential in the treatment of heavy metal wastewater. Moreover, the combination of sodium alginate hydrogel and metal–organic frameworks would broaden the potential application of hydrogel materials in other fields.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Hu Wang,Bingxia Wu,Yuan Cai,Chengwei Zhou,Nengjie Feng,Geng Liu,Chong Chen,Hui Wan,Lei Wang,Guofeng Guan
The core–shell-structured Co–Z@TiO2(N2+O2) catalyst, which was prepared by subsequent pyrolysis and calcination from precursor ZIF-67 coated by amorphous TiO2, was applied in Fischer–Tropsch synthesis (FTS). Compared with Co–Z@TiO2 catalyst, which was directly calcinated in air (Co–Z@TiO2(O2)) or pyrolyzed in N2 (Co–Z@TiO2(N2)), the Co–Z@TiO2(N2+O2) catalyst showed better dispersion, easier reducibility, and optimal metal cobalt particle size (8.4 nm) due to the intermediate pyrolysis treatment and core–shell structure. The Co–Z@TiO2(N2+O2) catalyst exhibited high cobalt time yield (14.84 μmolCO·gCo–1·s–1), high selectivity to C5+ (81.5%), and low selectivity to low carbon hydrocarbon (CH4 (12.7%) and C2–C4 (5.8%)). The core–shell structure could enhance diffusion limitations to transform intermediate products into heavier hydrocarbons. After 110 h of evaluation, the Co–Z@TiO2(N2+O2) catalyst still maintained good catalytic performance and cobalt particle size distribution.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 21
·7256-7264
·
IF 4.39
Lei Ye,Yeqing Zhang,Limin Wang,LinXiu Zhao,Yaqiong Gong
Due to the slow kinetics of oxygen evolution at the anode, the efficiency of electrocatalytic water decomposition is critically reduced, and its large-scale application is severely restricted. Therefore, it is urgent to develop electrocatalysts with excellent performance and stability to accelerate the oxygen evolution reaction (OER) reaction kinetics. Herein, a self-supporting binder-free electrocatalyst was successfully prepared using in situ grown Cu(OH)2 nanowires on CF as the carrier to grow ZIF-67 via a room temperature immersion method. The combination of Cu(OH)2 nanowires and the unique structure of ZIF-67 forms a three-dimensional nanostructured catalyst, in which the unique structure and the existence of synergy may contribute to a larger electrochemical active surface area, expose more electrochemically active sites, adjust the electronic structure, and accelerate the rate of electron transfer, thus greatly improving the electrocatalytic activity and durability for OER. The as-prepared Cu(OH)2@ZIF-67/CF exhibited excellent OER performance under alkaline conditions and required overpotentials of 205 mV and 276 mV to drive current densities of 10 mA cm−2 and 100 mA cm−2, respectively, with a small Tafel slope of 70.5 mV dec−1 for OER. The stability test of Cu(OH)2@ZIF-67/CF at the current density of 10 mA cm−2 displayed excellent stability for 22 h. This study provides a feasible strategy for the rapid preparation of low-cost and efficient electrocatalysts in alkaline media.
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ACS Sensors
·
2025
·
IF 9.1
Zhenguo Zhang,Xue Li,Shuo Zhang,Mingshuang Zheng,Fangping Yuan,Shushen Li,Bei Yuan,Lisheng Liu,Xin Du
Although immunotherapy has become an established approach in cancer treatment, not all patients exhibit a positive response. Current research on PD-1 primarily focuses on immune cells using conventional methods, yet PD-1 expression on tumor cells is also widespread and plays an increasingly critical role in assessing immunotherapy efficacy. To address this, we developed an electrochemical biosensor capable of specifically detecting PD-1 at both the protein and tumor cellular levels in situ, eliminating the need for sample fixation and thereby streamlining the analytical process. Additionally, our probe enables simultaneous localization analysis of PD-1 through fluorescence signaling. The biosensor integrates a bifunctional probe composed of a nanometal–organic framework (MOF, ZIF-8) conjugated with quantum dots (QDs) and an electrode modified with a carbon nanotube (CNT)–gold nanoparticle (AuNP) nanocomposite. The morphology and performance of the nanocomposite were thoroughly characterized, and the resulting PD-1 biosensor demonstrates high specificity, reproducibility, and sensitivity. To facilitate clinical translation, we successfully applied the biosensor to detect differential PD-1 expression across various tumor cell lines and cancer tissues. This study establishes that our dual-mode electrochemical and fluorescent sensing platform provides a powerful tool for in situ PD-1 detection on tumor cells, offering valuable insights for evaluating tumor immunotherapy responses.
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高影响因子
CARBON
·
2025
·
IF 11.6
Zhongkai Zhao,Xiaobo Zhu,Jiaxi Li,Wenjing Wang,Xiaocheng Jiang,Shan Shi,Siming Ren
Intrinsic self-healing coatings have attracted considerable research interest due to their remarkable ability to repair damage autonomously. However, their insufficient impermeability limits their long-term application in metal corrosion protection. Herein, we embedded corrosion-inhibiting cerium-doped ZIF-8 nanoparticles (Ce@ZIF-8) modified graphene oxide (GO) two-dimensional sheets into an epoxy network containing dynamic hydrogen bonds and disulfide bonds, developing a room-temperature self-healing epoxy/GO-Ce@ZIF-8 composite with remarkable barrier and corrosion resistance properties. Due to the metal coordination interaction between zinc or cerium in GO-Ce@ZIF-8 and the epoxy dynamic network, the modified nanosheets are efficiently and stably dispersed in the epoxy resin. The elaborately designed composite exhibits excellent stretchability (424.95 %), exceptional room-temperature self-healing capabilities (80.7 % at 25 °C for 8 h), and outstanding corrosion resistance. This is ascribed to the synergy of the superior physical shielding effect of nanosheets and the passivation of cerium elements released from nanoparticles on metal surfaces, achieving active/passive long-term corrosion protection through the intrinsic self-healing and external passivation of composite. This innovative strategy provides a new approach to developing novel high-barrier self-healing materials.
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ChemistrySelect
·
2025
·Vol. 10
·期 43
·e04072
·
IF 2
Xiao Bai,Yinxue Zhou,Chunyan Lv,Fanjun Zhang,Ziyin Yang,Zhe Liu
This work demonstrates that Zn single atoms exhibit intrinsic oxidase-like activity. Zn single-atom nanozymes (Zn-SAs/NC) were synthesized via direct pyrolysis of ZIF-8 at 1000 °C under N 2 atmosphere, which retains a rhombic dodecahedral morphology with atomically dispersed Zn sites. Crucially, Zn-SAs/NC exhibited pronounced oxidase-like activity, efficiently catalyzing the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB without exogenous H 2 O 2 . Control experiments with metal-free NC confirmed that the catalytic activity originated specifically from the Zn single atoms, challenging the traditional view of Zn's catalytic inertness. The Zn-SAs/NC-catalyzed TMB oxidation system was exploited for colorimetric detection of tannic acid (TA) based on TA's inhibitory effect, achieving high sensitivity (LOD = 0.016 µM) and selectivity. Successful application in real tea samples validated the method's practicality, establishing Zn single atoms as a novel nanozyme platform. Graphical This work develops a Zn single-atom nanozyme (Zn-SAs/NC) derived from ZIF-8 pyrolysis, which exhibits robust intrinsic oxidase-like activity for highly sensitive and selective colorimetric detection of tannic acid with a low detection limit of 0.016 µM.
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JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Tao Jian,Yongjin Fang,Xiang Cai,Mingyi Ying,Bisheng Li,Wangyang Ye,Liguo Shen,Leihong Zhao,Hongjun Lin
The development of high-performance membranes for heavy metal remediation remains a key challenge in advanced water treatment. In this work, a hierarchically structured composite membrane was fabricated via a self-confined growth strategy, in which Zn(OH) 2 nanostrands immobilized MoS 2 and directed the in-situ growth of ZIF-8, forming a defect-free interlayer for robust polyamide (PA) deposition. The resulting ZM15-PA membrane exhibits a highly hydrophilic surface with a contact angle of 31.5°, a strong positive surface charge under acidic conditions, and excellent water permeability reaching 83.5 L m -2 h -1 . Most notably, the membrane achieves an ultrahigh Pb(II) rejection rate of 99.2%, consistently reducing effluent concentrations to less than 10 μg L -1 , even in the presence of coexisting ions and dissolved organic matter. Mechanistic investigations reveal that Pb(II) removal is governed by synergistic mechanisms including electrostatic repulsion, molecular sieving, and coordination interactions involving Pb-S, Pb-O, and Pb-N bonds. Furthermore, the membrane demonstrates outstanding antifouling resistance, long-term operational stability, and antibacterial efficiency exceeding 99% under photo-Fenton conditions. These findings highlight the promise of self-confined growth strategies for stabilizing two-dimensional materials and developing multifunctional membranes for selective heavy metal removal in complex water matrices.
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Regenerative Biomaterials
·
2025
·
IF 8.1
Zhang Ting,Yu Yameng,Yuan Wei,Ren Zeqi,Cheng Yan,Wu Shuilin,Zheng Yufeng,Xia Dandan
Biodegradable Zn alloy have recently gained considerable attention for use in bone implants considering their biodegradability, attractive mechanical properties, and bioactivity. However, excessive corrosion of Zn alloy at the early stage of implantation may cause severe cytotoxicity, resulting in insufficient osseointegration, which hinders the clinical use of the Zn alloy. In this study, we designed a photothermal-controlled degradative hybrid coating as corrosion-protective barrier with the intention of preventing Zn ion burst release during the early stages of implantation and regaining the alloy's corrosion advantage later on. The coating consisting of Zeolite imidazole skeleton-encapsulated indocyanine green core-shell structured nanoparticles and polylactic coglycolic acid (ICG@ZIF-8/PLGA) on pristine Zn-0.8 (wt.%) Li (ZL) alloy. The electrochemical test results indicated that coating ZL with ICG@ZIF-8/PLGA might effectively reduce its corrosion current density (icorr) from 2.48 × 1 0 −5 A•cm−2 to 2.10 × 1 0 −8 A•cm−2. After near-infrared light irradiation, ICG@ZIF-8 heated PLGA coating to reach Tg, so that the coating was degrading, and the icorr of coated ZL alloy decreased to 2.50 × 1 0 −7 A•cm−2, thus restoring corrosion advantage. Both in vitro and in vivo investigations showed that coated ZL alloy had acceptable biocompatibility. Overall, the development of the photothermally controlled coating improved the Zn alloy's resistance to corrosion and allowed for the adjustment of the coated ZL alloy's rate of degradation through the use of 808 nm NIR laser irradiation.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Jianxin Liu,Rui Li,Yunfang Wang,Yawen Wang,Xiaochao Zhang,Caimei Fan
For detecting the active roles of ZIF-8 in composite photocatalyst , a novel Ag/AgCl/ZIF-8(50%) composite photocatalyst was designately prepared by anchoring Ag/AgCl nanoparticles on the surface of ZIF-8 with 50% content. The adsorption and photocatalytic performance of Ag/AgCl/ZIF-8(50%) were conducted by removal of Rhodamine B (RhB) from aqueous solution under dark and visible light irradiation (λ > 420 nm). The experimental results showed that the as-synthesized Ag/AgCl/ZIF-8(50%) exhibited higher photocatalytic activity than Ag/AgCl. The XRD , TEM , FTIR, DRS, VB XPS, ESR, N 2 adsorption isotherms and active species trapping experiments were used to characterize the performance of the composite photocatalyst. We found that the ZIF-8 in composite photocatalyst not only has the adsorption ability for RhB by its large specific area, but also has the ability for the formation of O 2 · − by an appropriate position of conduction band (CB). A reasonable reaction mechanism with a new perspective on the composite photocatalyst of Ag/AgCl/ZIF-8(50%) was proposed. This insight on the active roles of ZIF-8 in Ag/AgCl/ZIF-8(50%) may open a window for the use of MOF material in photocatalytic field.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2021
·
IF 5.268
Zhiyue Li,Zhiwei Guo,Taoyi Zhang,Quan Li,Jing Chen,Wenxi Ji,Cong Liu,Yun Wei
Synthesizing high uniform metal-organic frameworks grown on natural biomass such as sodium alginate (ALG), which can efficiently remove metal ions from aqueous solution, is a challenging project. A simple and eco-friendly method of preparing ALG@ZIF-67 hydrogels by in situ synthesis of ZIF-67 onto ALG hydrogels was established. Combining the virtues of ALG with abundant hydroxyl and carboxyl groups and ZIF-67 with excellent porous structure, the obtained ALG@ZIF-67 hydrogels have excellent adsorption for Cu 2+ (153.63 mg/g), which was much higher than that of pure ALG hydrogels (111.79 mg/g). The methodology showed that the adsorption process was in accord with the Langmuir isotherm adsorption model (R 2 = 0.9972) and pseudo-second-order kinetic model (R 2 = 0.9822). The thermodynamic experiments demonstrated that Cu (II) was absorbed by hydrogel with an endothermic and spontaneous process. The competitive adsorption experiment results of ALG@ZIF-67 hydrogel indicated that the absorption capacity of Cu (II) was higher than that of Cd (II), Ni (II), Zn (II) and Mn (II). Moreover, the ALG@ZIF-67 hydrogels still had excellent reusability after five adsorption-desorption cycles. The results indicated that the ALG@ZIF-67 hydrogels had the advantages of low cost, easy preparation, and environment friendly.
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WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 84
·期 1
·144-158
·
IF 1.915
Yin Jiulong,Tang Hai,Liu Di,Huang Tingting,Zhu Lei
High-performance sulfonated polysulfone (SPSf) mixed-matrix membranes (MMMs) were fabricated via a nonsolvent-induced phase separation (NIPS) method using zeolitic imidazolate frameworks-67 (ZIF-67) as a crosslinker. Acid-base crosslinking occurred between the sulfonic acid groups of SPSf and the tertiary amine groups of the embedded ZIF-67, which improved the dispersion of ZIF-67 and simultaneously improved the membrane strzcture and permselectivity. The dispersion of ZIF-67 in the MMMs and the acid-base crosslinking reaction were verified by energy-dispersive X-ray spectroscopy (EDX), X-ray diffractometry (XRD), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). The pore structure analysis of MMMs indicated that filling ZIF-67 into SPSf enhanced the average surface pore sizes, surface porosities and more micropore in cross-sections. The crossflow filtrations showed the MMMs have higher pure water fluxes (57 to 111 L m −2 h −1 ) than the SPSf membrane (55 L m −2 h −1 ) but also higher bovine serum albumin (BSA) rejection rate of 93.9–95.8%, a model protein foulant. The MMMs showed a higher water contact angle than the SPSf membrane due to the addition of hydrophobic ZIF-67 and acid-base crosslinking, and also maintained high thermal stability evidenced by the thermogravimetric analysis (TGA) results. At the optimal ZIF-67 concentration of 0.3 wt%, the water flux of the SPSf-Z67-0.3 membrane was 82 L m −2 h −1 with a high BSA rejection rate of 95.3% at 0.1 MPa and better antifouling performance (FRR = 70%). An SPSf-matrix ultrafiltration (UF) membrane was developed by blending with hydrophobic ZIF-67. ZIF-67 has good dispersibility and compatibility with SPSf of weak acid-base interaction. Simultaneous enhancement in the permeability and selectivity of the MMMs.
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