Arabian Journal of Chemistry
·
2020
·
IF 4.762
Lang Wen,Xuedan Chen,Chao Chen,Ruisong Yang,Min Gong,Yiguo Zhang,Qingshan Fu
Chitosan/MOF composite porous monolith used in water remediation as adsorbent can realize high-efficient removal of pollutant in water and facile recycling from water. However, dissolution of chitosan (without crosslinking) in acidic aqueous solution will cause breakage of composite monolith. Herein, we report a chitosan/UiO-66 monolith prepared by ice-templating method. Specially, a pre-crosslinking treatment (by glutaraldehyde) is employed before the monolith formation, which obviously boosts its stability in aqueous solution. The composite monolith is evaluated by SEM, N 2 adsorption, XRD, and batch adsorption tests for Congo Red (CR). The results show that the composite monolith possesses a typical ice-templating structure with hierarchical (mirco- / meso- and macro-) pores. UiO-66 particles are embedded on the surface of chitosan matrix, and the crystal structure of UiO-66 is not changed obviously by the crosslinking and freezing process. The composite monolith exhibits high adsorption efficiency (90% of CR was removed from its aqueous solution in 60 min) and the maximum adsorption capacity of 246.21 mg/g (derived from Langmuir model) can be reached. After adsorption, the monolith is collected by a facile procedure and recovered using ethanol for evaluating its reusability. After 4 cycles, the CR removal efficiency of the composite monolith still remains ~90% of the initial efficiency. This work demonstrates that the simple crosslinking procedure before monolith formation can ensure the intact shape of the chitosan/MOF monolith during adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
FUEL
·
2018
·
IF 4.908
Xiong-Fei Zhang,Zhongguo Wang,Yi Feng,Yuxia Zhong,Jiaqiang Liao,Yaquan Wang,Jianfeng Yao
Metal organic frameworks (MOFs) have recently emerged as promising candidates for efficient removal of sulfur-containing compounds (SCCs) from liquid fuels. In this study, adsorptive desulfurization (ADS) is performed by adsorbing thiophene (TP) and benzothiophene (BT) from model fuels over pristine and functionalized UiO-66 (Zr). The introduction of amino ( NH 2 ) and carboxylic ( COOH) groups reduces the porosity of UiO-66. However, the adsorption capacities of functionalized UiO-66 improved remarkably. Especially for the adsorbent functionalized with amino moieties (UiO-66-NH 2 ), its maximum adsorption capacities for TP (29.5 mg S/g) and BT (35.7 mg S/g) are 1.7 and 1.8 times to that of bare UiO-66. The superior performance of UiO-66-NH 2 is ascribed to the higher availability of hydrogen-bond donor sites in the surface and the favorable interactions between H atoms of NH 2 and sulfur species. UiO-66-COOH is beneficial for the adsorption of SCCs than that of pristine UiO-66 because of the existence of acid-base interactions. Moreover, the reusability of UiO-66-NH 2 is confirmed by regenerating it via a simple solvent washing.
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
Nanomaterials
·
2024
·
IF 4.4
Xiaohang Lin,Yuzhu Xiong,Fuping Dong
Environmental pollution of phosphorus is becoming increasingly concerning, and phosphate removal from water has become an important issue for controlling eutrophication. Modified metal–organic framework (MOF) materials, such as UiO-66-NH 2 , are promising adsorbents for phosphate removal in aquatic environments due to their high specific surface area, high porosity, and open active metal sites. In this study, a millimeter-sized alginate/UiO-66-NH 2 composite hydrogel modified by polyethyleneimine (UiO-66-NH 2 /SA@PEI) was prepared. The entrapping of UiO-66-NH 2 in the alginate microspheres and its modification with PEI facilitate easy separation in addition to enhanced adsorption properties. The materials were characterized by SEM, FTIR, XRD, and BET. Static, dynamic, and cyclic adsorption experiments were conducted under different pH, temperature, adsorbent dosage, and initial concentration conditions to assess the phosphate adsorption ability of UiO-66-NH 2 /SA@PEI. Under optimal conditions of 65 °C and pH = 2, 0.05 g UiO-66-NH 2 /SA@PEI adsorbed 68.75 mg/g, and the adsorption rate remained at 99% after five cycles of UiO-66-NH 2 /SA@PEI. These results suggest that UiO-66-NH 2 /SA@PEI composite materials can be used as an effective adsorbent for phosphate removal from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Carbon Capture Science & Technology
·
2023
·
IF 0
Wufeng Wu,Jiang Fan,Dongyue Wang,Yali Zhao,Xinglei Zhao,Yanying Wei
MOF membranes exhibit impressive performance in gas separation due to their large surface area, controllable pore size and unique affinity. Here, the ultrathin UiO-66-NH 2 polycrystalline membranes with thickness of ∼320 nm are successfully prepared within 1 h using a combination of ultrasound-assisted and microwave synthesis strategies. During the reaction, high-density small MOF nuclei are produced by sodium formate ultrasound-assisted, which act as sufficient nucleation sites for heterogeneous nucleation during membrane growth, aiming for development of a continuous MOF membrane on the porous substrate. The obtained UiO-66-NH 2 membrane shows an ideal CO 2 /CH 4 selectivity of 40 due to the enhanced the interaction between CO 2 molecules and the membrane. Moreover, the narrowed pore structure further hinders the diffusion of larger-sized molecules owing to -NH 2 occupying the pore channels, resulting in elevated CO 2 /CH 4 selectivity. Compared to many other MOF membranes, the UiO-66-NH 2 polycrystalline membranes exhibit a well balance of gas permeance and CO 2 /CH 4 selectivity, which presents a new route for CO 2 capture.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
DOI
INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Mingyan Chen,Dehua Zhang,Ziying Wang,Yao Zhang,Yucheng Liu
UiO-66 loading carboxyl and phosphotungstic acid has a good affinity to thiophene (TH). The synthesized catalyst, changed its original structure, which can increase its reactive site and enhance the interaction with thiophene (TH) in order to improve the adsorption performance. Then the structural changes were analyzed by XRD, FT-IR, SEM, BET, EDS and other characterization methods. Through static experiments of adsorption desulfurization, it is found that when the adsorption time is 240 min, the adsorption temperature is 30 ℃ and the oil-to-agent ratio is 100:1, the adsorption effect: UiO-66-(COOH) 2 (UC2) > UiO-66, the highest adsorption capacity can reach 89.99 mg/g; while PTA@UiO-66 (PAU) can reach adsorption equilibrium at 210 min, it has better desulfurization performance than UiO-66. After being recycled for 5 times, the adsorption effect is only slightly decreased: the adsorption capacity of UC2 was still 78.02% of the initial adsorption capacity, while that of PAU was 76.07% of the initial adsorption capacity. According to the adsorption kinetics, the adsorption process of thiophene on the adsorbent UC2 is more consistent with W-M model, and the adsorption of PAU is more in line with the pseudo-first order kinetic equation. In addition, it also includes the process of intraparticle diffusion and liquid film diffusion.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Ning Liu,Bin Hu,Kexin Tang,Tingyu Xia,Fei Li,Guixiang Quan,Xiaodong Zhang,Liang Tang
In the pursuit of restoring and preserving our planet's natural equilibrium, the development of photocatalytic agents with exceptional aptitude for CO 2 reduction stands as an essential undertaking, which would be greatly facilitated with the energy regeneration and environmental purification. Herein, a composite material HTiNbO 5 /UiO-66 (UTi) was amalgamated by a one-step solvothermal method. The resultant composite material exhibited remarkable improvement on the photoreduction efficiency of CO 2 reduction compared with pristine UiO-66 and HTiNbO 5 . Impressively, UTi composite with 3 wt% HTiNbO 5 (UTi-3) illustrated the highest CO 2 photoreducation activity to CO, the CO yield of UTi-3 was about 9.3 and 11.2 times higher than that of pure UiO-66 and HTiNbO 5 , respectively. The significantly improved photocatalytic performance could be ascribed to the enlargement of specific surface area, the improved visible-light absorption range and shrinkage of the energy band gap, which can increase photogenerated electron production to promote the reduction reaction of CO 2 to CO. The insights obtained from this study can guide the application of semiconductor composites in the field of CO 2 photocatalytic reduction, so as to design high efficiency photocatalysts .
研究领域:
材料科学
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环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 9
·2103
·
IF 3.1
Pengfei Zhu,Qiaosen Yuan,Na Li,Zhaoxia Hu,Shouwen Chen
The development of efficient catalysts with longevity to remove chlorobenzene is challenging due to Cl poisoning. Herein, a series of Mn-Cr/ZrOxcatalysts supported by Zr-based metal-organic framework (UiO-66)-derived ZrOxwas prepared and investigated for chlorobenzene (CB) catalytic oxidation. MnCr/ZrOx-M prepared via a wet impregnation method presented an amorphous structure, indicating the homogeneous dispersion of Cr and Mn, which improved acid and redox properties. 40Mn7Cr3/ZrOx-M exhibited the best catalytic activity for chlorobenzene oxidation with T90of 293 °C, which is mainly due to the strong interaction between manganese and chromium promoted by the large specific surface area of the ZrOxsupport. Furthermore, 40Mn7Cr3/ZrOx-M presented excellent stability for chlorobenzene oxidation.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2024
·
IF 2.6
Hao He,Xiao-kai Liu,Bai-yun Zhao,Li-juan Zhou,Xuan Zhao,Chen-xu Wang,Ji-yuan Zhang,Yuan-fang Zhang,Li Wang
In this study, UiO-66-NH2 nanoparticles were synthesized via a hydrothermal method, using acetic acid and hydrochloric acid as modulators to optimize the specific surface area and pore width. Oxytetracycline (OTC) was chosen as the test compound to evaluate the adsorption efficiency of UiO-66-NH2.The material was thoroughly characterized under varying conditions, and the adsorption mechanism was systematically explored through adsorption kinetics, isotherms, and thermodynamic analyses. The results demonstrated that UiO-66-NH2 exhibited a high OTC adsorption capacity, achieving a maximum of 312.5 mg g−1 under optimal conditions. XRD, TGA, and BET analyses revealed that acetic acid and hydrochloric acid significantly improved the crystallinity and thermal stability of UiO-66-NH2, increasing the specific surface area from 8.023 m2 g−1 to 998.663 m2 g−1 and reducing the pore width from 18.783 nm to 2.129 nm. FTIR, XPS, adsorption kinetics, and isotherm studies indicated that the main forces driving OTC adsorption by CMC-Fe were hydrogen bonding, π–π stacking, weak electrostatic interactions, and pore filling. Cyclic adsorption experiments further demonstrated the excellent reusability of UiO-66-NH2. In summary, the use of acetic acid and hydrochloric acid significantly increased the specific surface area of UiO-66-NH2, exposing more adsorption sites and playing a critical role in pollutant removal.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 25
·5817-5829
·
IF 7
Shaohu Huo,Qianhui Xie,Min Zhang,Zitong Jiang,Ling Fu,Wenhong Li,Chenrong Bian,Kaile Wu,Yulin Zhu,Xuan Nie,Shenggang Ding
Antibiotic tolerance is implicated in difficult-to-treat infections and the development and spread of antibiotic resistance. The high storage capacities and excellent biocompatibilities of UiO-66-based metal–organic frameworks (MOFs) have made them emerging candidates as drug-delivery vectors. In view of hydrogen sulfide (H2S) having been associated with the development of intrinsic resistance to antibacterial agents, we designed a strategy to potentiate existing antibiotics by eliminating bacterial endogenous H2S. We efficiently fabricated an antibiotic enhancer Gm@UiO-66-MA to remove bacterial H2S and sensitize an antibacterial by modifying UiO-66-NH2 with maleic anhydride (MA) and then loading it with gentamicin (Gm). UiO-66-MA achieved the removal of bacterial endogenous H2S and the destruction of bacterial biofilm by selectively undergoing Michael addition with H2S. Moreover, Gm@UiO-66-MA further enhanced the susceptibility of tolerant E. coli to Gm after reducing bacterial intracellular H2S levels. An in vivo skin wound healing experiment confirmed that Gm@UiO-66-MA could greatly reduce the risk of bacterial reinfection and accelerate wound healing. Overall, Gm@UiO-66-MA offers a promising antibiotic sensitizer for minimizing bacterial resistance and a therapeutic strategy for tolerant bacteria-related refractory infections.
研究领域:
材料科学
·
微生物学
·
药物递送
·
感染与免疫
✓ 已验证
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yang Wang,Sidi Wang,Zhen Li,Liwei Sun,Xiaoyu Yang,Shaokun Tang
UiO-66 nanocrystals were synthesized by supercritical reaction crystallization with anhydrous zirconium chloride as the metal precursor, terephthalic acid as the ligand, and a small amount of N,N-dimethylformamide (DMF) and formic acid as cosolvents in supercritical CO2. In our work, the product UiO-66 obtained exhibits typical octahedral morphology with a specific surface area of 1092 m2/g and concentrated micropore diameters of 0.77, 1.05, and 1.73 nm. The thermal decomposition temperature of the product is 450 °C. It was found that the adsorption selectivity of UiO-66 for Congo red is much higher than those for methylene blue and methyl orange, which can reach up to over 1300 mg/g. The adsorption process conforms to the second-order adsorption kinetics curve, and the adsorption isotherm fits into the Langmuir model. Meanwhile, the adsorbent UiO-66 possesses good cycle stability and its adsorption performance remains excellent after seven cycles.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2020
·
IF 5.778
Yuqiang Xiang,Huaduo Yan,Bingjie Zheng,Aroosha Faheem,Wenli Chen,Yonggang Hu
E. coli @UiO-67 composites were obtained using an effective and simple self-assembly method. The composites showed unique properties as a remarkable and recyclable adsorbent for the efficient removal of bisphenol A (BPA) from water with a high adsorption capacity (402.930 mg g −1 ). The increase in pore size is a key factor why E. coli @UiO-67 composites maintained high capacity. The reason might be due to that the composites with large pore sizes and defects could effectively improve mass transport and active molecular metal sites. The adsorption of BPA is a chemisorption process due to the Zr–OH groups in UiO-67 exhibit affinity toward BPA molecules, π–π interaction, and electrostatic attraction. The adsorption efficiency remained at 82.5% after 15 cycles without any remarkable changes in the PXRD patterns of E. coli @UiO-67. Moreover, the use of microorganism-loading MOFs could reduce the cost to at least 50% and minimize secondary pollution through nanoscale MOFs usage reduction. The developed composites have advantages, including low-cost, high adsorption capacity, easy to be separated and regenerated from aqueous solution, a large number of cycles, short adsorption equilibrium time, and stability, showing excellent application prospects. The presented strategy would be a potentially promising way to produce novel MOFs-based adsorbents with high-performance to control environmental pollution from wastewater.
研究领域:
环境科学
·
材料科学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 16
·7870-7879
·
IF 11.301
Rongming Xu,Qinghua Ji,Pin Zhao,Meipeng Jian,Chao Xiang,Chengzhi Hu,Gong Zhang,Chaochun Tang,Ruiping Liu,Xiwang Zhang,Jiuhui Qu
Metal–organic frameworks (MOFs) have attracted increasing interest for adsorption applications due to their ultrahigh porosity and specific surface area. However, their adsorption performance in liquids, particularly for water treatment, is significantly limited by the poor accessibility of micropores inside the MOF matrix to most molecules and deficient active sites. Herein, we use a facile strategy, ligand selective thermolysis, to create oxygen vacancies and construct mesopores in water stable UiO-66. The obtained hierarchically porous UiO-66 (HP-UiO-66) has tunable oxygen vacancies and mesopores, and outperforms the state-of-the-art MOF based adsorbents reported so far in removing arsenic, achieving an ultrahigh adsorption capacity of 248.75 mg g−1 under neutral conditions. Extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) analysis and density functional theory (DFT) calculations reveal that arsenic is mainly captured by forming bidentate Zr–O–As bonds between arsenate and HP-UiO-66 via occupying coordinatively unsaturated zirconium atoms. This study offers a new strategy for designing ultrahigh performance MOF based adsorbents.
研究领域:
环境科学
·
材料科学
✓ 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）