CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
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IF 3.171
Pascal Habimana,Yanjun Jiang,Jing Gao,Jean Bernard Ndayambaje,Osama M. Darwesh,Jean Pierre Mwizerwa,Xiaobing Zheng,Li Ma
The continuous use of chemical dyes in various industries, and their discharge into industrial effluents, results in severe problems to human life and water pollution. Laccases have the ability to decolorize dyes and toxic chemicals in industrial effluents as green biocatalysts. Their possible industrial applications have been limited by poor reusability, low stability, and loss of free laccase action. In this research, laccase was immobilized on zeolitic imidazolate framework coated multi-walled carbon nanotubes (Laccase@ZIF-8@MWCNTs) via metal affinity adsorption to develop an easy separable and stable enzyme. The optimum reaction conditions for immobilized laccase are at a pH of 3.0 and a temperature of 60 °C. The immobilized laccase was enhanced in storage and thermal stability. The results indicated that Laccase@ZIF-8@MWCNTs still maintained 68% of its original activity after 10 times of repeated use. Most importantly, the biocatalytic system was applied for decolorization of different dyes (20 mg·L −1 ) without a mediator, and up to 97.4% for Eriochrome black T and 95.6% Acid red 88 was achieved in 25 min. Biocatalysts with these properties may be used in a variety of environmental and industrial applications.
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Inorganic Chemistry Frontiers
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2021
·Vol. 9
·期 3
·599-606
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IF 6.569
Shiyu Zhou,Jiapeng Ji,Tong Qiu,Liguang Wang,Wenbin Ni,Sheng Li,Wenjun Yan,Min Ling,Chengdu Liang
Hydrogen (H2) sensors based on metal oxide semiconductors (MOSs) have attracted considerable attention for safety concerns of traditional industries and energy storing devices. ZnO has been widely studied as an n-type MOS in H2 sensing due to the excellent stability, mobile conductive carriers, and wide bandgap. However, the poor selectivity and high working temperature limit its practical applications. Herein, we designed a heterostructure based on ZIF-8-derived ZnO by rGO functionalization to boost the selective H2 sensing. This composite demonstrated dramatic H2 selectivity against other flammable gases, particularly ethanol, which was improved by deoxygenation to reduce the surface oxygen functional groups. This sample showed excellent H2 sensing with a high response of ∼18 to 200 ppm H2, and a response/recovery time of 50/7 s at 400 °C. Even at a certain low temperature of 200 °C, the composite showed evident response to H2. The excellent gas sensing behavior could be attributed to the heterojunctions and enhanced electron mobility. Regulation of the surface oxygen-containing functional groups opens up a promising approach to adjust the gas sensing selectivity of MOS-based materials.
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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
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2021
·Vol. 110
·期 4
·954-963
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IF 4.396
Yuxuan Ma,Chenwei Wang,Lvming Zhu,Chunmei Yu,Bing Lu,Yang Wang,Yue Ding,Chang-Ming Dong,Yong Yao
Stimuli-responsive prodrug-based nanoplatform with synergistic antitumor activity is of central importance to the development of promising nanomedicines for cancer therapy. Here, we describe a polydopamine-drug conjugate nanocomposite (ZP-PDA-DOX) with targeted cancer photothermal-chemotherapy (PTT-CT), which constructed by a gradual copolymerization of dopamine (DA) and pH-sensitive dopamine-derived prodrug (DA-DOX) into the porous channels of zeolite imidazolate frameworks-8 (ZIF-8), followed by PEGylation with amino-terminated folic acid-polyethylene glycol (NH 2 -PEG-FA) to acquire the high biocompatibility, specificity, and excellent tumor-targeting property. The incorporation of polydopamine strengthened the stability and dispersion of ZIF-8, and also conferred photothermal conversion effect. In the tumor acidic microenvironment, the acid-labile hydrazone linker of DA-DOX and ZIF-8 promptly degraded to release activated DOX. Moreover, the generated hyperthermia due to the high photothermal conversion efficiency of PDA component could accelerate drug release, and simultaneously thermally ablate tumor tissue to maximize the DOX-induced CT, which could also assist PTT to eradicate tumor cells. This study provides a promising strategy for targeted cancer PTT-CT with synergistic anti-tumor effect.
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PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Xiong-Fei Zhang,Zhongguo Wang,Lian Song,Jianfeng Yao
The practical application of ZIF-8 crystals is commonly limited by their powder form. In this work, natural balsa wood sheets were employed as substrate for dispersing and shaping ZIF-8 particles. By in situ growth method, ZIF-8 layer was coated on the aligned wood channels to construct ZIF-8/wood composites with a hierarchical structure. A good affinity and interfacial compatibility between ZIF-8 and wood lumens was observed. The wood channels enable high-speed water transport and the ZIF-8/wood composites were integrated into filtration systems for continuous wastewater treatment. At a 7.9 wt% ZIF-8 loading, the three-layered ZIF-8/wood filter (ZW-2) presented an effective treatable volume of 800 mL of 10 mg L −1 Cu 2+ solution. Moreover, ZW-2 exhibited an excellent recyclability and reusability. Such wood-based composite is renewable, low cost, and holds great potential for practical environmental remediation.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
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2021
·Vol. 44
·期 6
·1309-1319
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IF 3.21
Guo Feng,Xu Zhonghao,Zhang Wendong,Wang Tongxin,Di Xiaoxuan,Zhang Qian,Zhu Zihan
Enzymes immobilized in metal–organic frameworks (MOFs) have attracted great attention as a promising hybrid material. In the study, a novel biomimetic mineralization encapsulation process for a highly stable and easily reusable catalase (CAT)@ZIF-8 composite has been designed. This immobilization process provides a high enzyme loading of 70 wt %. The CAT@ZIF-8 composites exhibited a much lower K m value and better enzyme activity than those of free CAT, exhibiting good stability against enzymatic hydrolysis and protein denaturation under harsh conditions. The inhibitory effects of pesticides such as pH, temperature, solvent (i.e., methanol, dimethyl sulfoxide and tetrahydrofuran) and storage at room temperature (6 months) on the activity of free and immobilized catalase enzyme were investigated. The CAT@MOF composites also exhibited excellent reusability, an obvious advantage for treating a wastewater from food processing. The CAT@MOF developed is promising for the efficient removal of H 2 O 2 under harsh conditions.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Huan Yang,Shuai Hu,Hui Zhao,Xiaofei Luo,Yi Liu,Chengfei Deng,Yulan Yu,Tianding Hu,Shaoyun Shan,Yunfei Zhi,Hongying Su,Lihong Jiang
Efficient removal of antibiotics from aqueous solution is of fundamental importance due to the increasingly severe antibiotic-related pollution. Herein, a high-performance Fe-ZIF-8-500 adsorbent was synthesized by Fe-doping strategy and subsequent activation with high-temperature. In order to evaluate the feasibility of Fe-ZIF-8-500 as an adsorbent for tetracycline (TC) removal, the adsorption properties of Fe-ZIF-8-500 were systematically explored. The results showed that the Fe-ZIF-8-500 exhibited ultrahigh adsorption capacity for TC with a record-high value of 867 mg g -1 . Additionally, the adsorption kinetics and isotherms for TC onto the Fe-ZIF-8-500 can be well-fitted by the pseudo-second-order kinetics model and the Freundlich model, respectively. The ultrahigh adsorption capacity of Fe-ZIF-8-500 can be explained by the synergistic effect of multi-affinities, i.e., surface complexation, electrostatic attraction, π-π interaction and hydrogen bonding. After being used for four cycles the adsorption capacity of Fe-ZIF-8-500 remains a high level, demonstrating its outstanding reusability. The ultrahigh adsorption capacity, excellent reusability, satisfactory water stability and easy-preparation nature of Fe-ZIF-8-500 highlight its bright prospect for removing tetracycline pollutant from wastewater.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Jie Zheng,Bingzhi Li,Yuan Ji,Yin Chen,Xun Lv,Xing Zhang,Robert J. Linhardt
Natural active polysaccharides are attracting increased attention from pharmaceutical industries for their valuable biological activities. However, the application of polysaccharides has been restricted due to their relatively large molecular weight, complex structure, and instability. Metal-organic frameworks (MOFs) have emerged to help deliver cargo to specific locations, achieving the objectives of eliminating the potential damage to the body, protecting the drugs, and improving therapeutic effectiveness. Here, a pH-responsive zeolitic imidazolate framework (ZIF-8) was synthesized to encapsulated three sulfated polysaccharides (heparin, fucan sulfate, fucosylated chondroitin sulfate) and a non-sulfated polysaccharide, hyaluronic acid. The resulting [email protected] biocomposites showed differences in terms of morphology, particle size, encapsulation, and release efficiency. These biocomposites retained antithrombotic activity and the framework ZIF-8 effectively protected these polysaccharides from degradation and prolonged shelf-life of the anticoagulants from the unfavorable environment.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2021
·
IF 3.171
Shuai Fan,Huiyuan Cheng,Manman Feng,Xuemei Wu,Zihao Fan,Dongwei Pan,Gaohong He
The conversion of CO 2 electrocatalytic hydrogenation into energy-rich fuel is considered to be the most effective way to carbon recycle. Nitrogen-doping carbonized ZIF-8 is proposed as carrier of the earth-rich Sn catalyst to overcome the limit of electron transfer and CO 2 adsorption capacity of Sn. Hierarchically porous structure of Sn doped carbonized ZIF-8 is controlled by hydrothermal and carbonization conditions, which induces much higher specific surface area than that of the commercial Sn nanoparticle (1003.174 vs. 7.410 m 2 ·g −1 ). The shift of nitrogen peaks in X-ray Photoelectron Spectroscopy spectra indicates interaction between ZIF-8 and Sn, which induces the shift of electron cloud from Sn to the chemical nitrogen to enhance conductivity and regulate electron transfer from catalyst to CO 2 . Lower mass transfer resistance and Warburg resistance are investigated through EIS, which significantly improves the catalytic activity for CO 2 reduction reaction (CO 2 RR). Onset potential of the reaction is reduced from −0.74 V to less than −0.54 V vs. RHE. The total Faraday efficiency of HCOOH and CO reaches 68.9% at −1.14 V vs. RHE, which is much higher than that of the commercial Sn (45.0%) and some other Sn-based catalyst reported in the literature.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Daile Zhang,Jianghua Zhang,Mingdi Pan,Yun Wang,Ting Sun
Electrochemical deposition is a facile technique to fabricate metal organic frameworks (MOFs) based materials in a short reaction time under mild conditions. In this work, novel necklace-like zeolitic imidazole framework@multiwalled carbon nanotubes (ZIF-8@MWCNTs) composite was synthesized by electrochemical method for the first time and then used as precursor for subsequent carbonization and acid treatment. The resultant porous carbon material (C-ZIF-8@MWCNTs) maintained the necklace-like structure with a high surface area of 1063.2 m 2 g −1 . When used as electrode material for supercapacitor , the C-ZIF-8@MWCNTs demonstrated a high specific capacitance of 259.2 F g −1 at the current density of 0.5 A g −1 . Further, the capacitance retention could reach 92% after 5000 cycles under the current density of 15 A g −1 . Due to the large specific surface area of the porous carbon derived from ZIF-8 and the intrinsic high conductivity, the C-ZIF-8@MWCNTs displayed good rate ability and cycle performance. The current work can expand the method to synthesize functional MOFs-based materials for advanced applications.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 6
·3095-3101
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IF 3.288
Yilin Yin,Jingchao Liu,Zengnan Wu,Ting Zhang,Zenghe Li
As one of the most essential semiconductors, ZnO has been widely used for solar cells, photocatalysis, environmental remediation, etc. Doping and morphology control of ZnO can significantly improve the efficiency of its photocatalytic performance. Tetracycline hydrochloride (TC) is widely used in medical and veterinary fields. Its excess use harms the environment and human health. Herein, we have successfully prepared Cu2O-doped ZnO with a porous structure by calcination using ZIF-8 as the precursor. After exposure to visible light (λ >420 nm) for 75 min, these photocatalysts exhibited a reasonable TC degradation rate (∼83.6%). Compared with ZnO, the Cu2O-doped ZnO introduces a p–n heterojunction and increases oxygen vacancies, which reduces the band gap and electron–hole recombination. Therefore, the photocatalytic efficiency for TC and PEC performance have been improved.
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MATERIALS CHEMISTRY AND PHYSICS
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2020
·
IF 3.408
Lei Cheng,Puxuan Yan,Xiulin Yang,Huahong Zou,Hu Yang,Hong Liang
Deeply understanding the structure and electrical properties of ZIF-8 is very important due to many practical applications of porous materials . We present the crystal structure and microstructure details of ZIF-8 prepared in three different solvents. The solvents play an important role on grain growth of ZIF-8, furthermore, a small fraction of monoclinic phase can be found in the ZIF-8s prepared in water or in amonium hydroxide. Radio-frequency dielectric and impedance spectra studies of dynamic dielectric response of ZIF-8s indicate two additional dielectric relaxation processes associated with the introduced water molecules in as-prepared samples. The dielectric response can be described by the combination of the dc conductivity, the universal dielectric response, the Cole-Cole relation and intrinsic response. The results exhibit the solvents make an important influence on the electrical properties due to different contents water in ZIF-8s. Our results will pave a way to modify the dielectric property of ZIF-based dielectrics in radio-frequency applications.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Jiaojiao Cao,Chengbin Guo,Xingpeng Guo,Zhenyu Chen
A zeolitic imidazole framework-8 (ZIF-8) derivative was synthesized and developed as the corrosion inhibitor of copper in 0.5 mol/L NaCl solution, and its inhibition performance was investigated by electrochemical measurement and surface analysis . Results show that the ZIF-8 derivative could effectively inhibit copper from corrosion, and the inhibition efficiency was 87.2% at an optimal ZIF-8 derivative concentration of 45 mg/L. The corrosion inhibition mechanism of the ZIF-8 derivative could be explained as follows: the amino functional groups and the π-system formed by aromatic rings of the ZIF-8 derivative were tightly adsorbed on the copper substrates, which systematically formed a hydrophobic film, thereby effectively inhibiting the corrosion caused by aggressive ions.
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