COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Jingcheng Du,Changyuan Zhang,Hong Pu,Yufeng Li,Saimeng Jin,Luxi Tan,Cailong Zhou,Lichun Dong
Oil/water separation is an urgent topic because the frequently occurred oil leakages and increasing discharge of oily wastewater. The 3D metal foams with special wettabilities are promising oil/water separation materials owing to their outstanding properties. Herein, we fabricated a HKUST-1 MOFs decorated copper foam using a facile template-sacrificial method for oil/water separation. The as-prepared copper foam possessed good superhydrophobicity under broad pH and saline conditions. Its oil adsorption capability was larger than 150% for all the chosen oils and the oil/water separation efficiency of the foam for various oil/water mixture was larger than 96%. Furthermore, although the wettability decreased to hydrophobic state after 30 cycles of mechanical abrasion, the separation efficiency of the foam kept above 97%, showing good repeatability. Results demonstrated that the distinctive 3D structure of copper foam contributed the excellent durability to mechanical abrasion.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Ye Zhang,Zhongyi Jiang,Jing Song,Jian Song,Fusheng Pan,Peng Zhang,Xingzhong Cao
Polymeric dense membranes for separating molecules with similar properties in liquid mixture according to solution-diffusion mechanisms are often constrained by trade-off effects. Integrating a facilitated transport mechanism and a sieving mechanism into membranes is a preferred approach to address this issue. Herein, amine-functionalized titanium-based metal–organic frameworks (NH2-MIL-125(Ti)) immobilized with Ag+, Ag+@NH2-MIL-125(Ti), was synthesized and hybrid membranes were fabricated for pervaporative desulfurization. The immobilized Ag+ can form reversible π-complexation toward thiophene and achieve thiophene-selectivity transport via a facilitated transport mechanism; meanwhile, Ag+ can decrease the effective pore size of the MOFs to elevate the diffusion selectivity of thiophene via a sieving mechanism. Accordingly, the resulting Pebax membranes with 1.0 wt % Ag+@NH2-MIL-125(Ti) exhibit a permeation flux of 22.11 kg/(m2 h) and an enrichment factor of 5.92. Furthermore, the hybrid membranes display increased thermostability and antiswelling properties by the incorporation of Ag+@NH2-MIL-125(Ti). This study proposes a strategy for the rational design of MOFs as nanofillers and endow the membranes with superior separation performance by integrating multiple transport mechanisms.
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TALANTA
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2018
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IF 4.244
Xuemei Wang,Xiaomin Ma,Pengfei Huang,Juan Wang,Tongtong Du,Xinzhen Du,Xiaoquan Lu
Hybrid magnetic nanocomposites based on Cu-MOFs, graphene oxide (GO), and Fe 3 O 4 nanoparticles (NPs) were prepared via chemical bonding approach, which GO were used as platforms to load nanostructured Cu-MOFs and Fe 3 O 4 NPs. The composite features both magnetic separation characteristics and high MOFs porosity, making it an excellent adsorbent for magnetic solid-phase extraction (MSPE). The as-synthesized nanocomposites are characterized by XRD, TGA , SEM, TEM, nitrogen adsorption-desorption analysis and FT-IR spectroscopy. The composites are used in MSPE of six aromatic insecticides from various real samples prior to their quantification by HPLC . Amount of adsorbent, extraction times, extraction temperature, desorption times and oscillation rate are optimized. Under the optimal conditions, the method has a relative standard deviations (RSDs) of 1.9–2.7%, and good linearity (correlation coefficients higher than 0.9931). The low LOD and LOQ for six insecticides are found to be 0.30–1.58 μg L -1 and 1.0–5.2 μg L -1 , respectively. The RSDs of within batch extraction are 1.6–9.5% and 3.9–12% for batch to batch extraction. The experimental results suggest that the nanocomposites have potential application for removal of hazardous pollutants from effluents.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2017
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IF 2.714
Zhennan Shi,Chen Xu,Han Guan,Ling Li,Lu Fan,Yingxi Wang,Li Liu,Qingtao Meng,Run Zhang
We designed and synthesized a magnetic metal organic frameworks (MOFs) composite, Cu-MOFs/Fe 3 O 4 as the adsorbent for removal of lead (Pb(II)) and malachite green (MG) in wastewater. This Cu-MOFs/Fe 3 O 4 can be easily prepared by in-situ growth of Cu-MOFs with doping Fe 3 O 4 nanoparticles . The prepared Cu-MOFs/Fe 3 O 4 composite was well characterized by SEM , XRD , and FTIR spectra. The adsorption experiments found that Cu-MOFs/Fe 3 O 4 can serve as adsorbent for removal of Pb(II) and MG simultaneously. The adsorption capacities were found to be 113.67 mg/g for MG and 219.00 mg/g for Pb 2+ , respectively, which are significantly higher than reported materials. Adsorption isotherm , kinetics and recyclability of Cu-MOFs/Fe 3 O 4 for removal of Pb(II) and MG were then studied. Adsorption of Pb(II) and MG exhibited Freundlich adsorption isotherm model, with the adsorption kinetics of available second-order kinetic. Physical adsorption for MG and chemical adsorption for Pb(II) were confirmed by Dubinin-Radushkevich (D-R) isothermal adsorption model. The adsorption of Pb(II) and MG in real water samples were then studied. The Fe 3 O 4 /Cu-MOFs was found to be recyclable for removal of Pb(II) and MG, can be explored as the potential adsorbent for waste water treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Jianfeng Dai,Zhaokuan Li,Rui Yu,Danqiang Huang
Metal element selection and reasonable design of material morphology are essential to ensure the improvement of supercapacitor electrochemical performance. In this work, based on the cobalt salts and manganese salts in the bimetallic organic framework with different molar ratios, a ternary layered double hydroxide electrode material with a hollow polyhedral structure was made by Ni 2+ etching the bimetallic organic framework to assess its suitability for use in a supercapacitor. When the molar ratio of Co/Mn is 3:1, NiCoMn-LDH 3:1 has a maximum specific capacity of 227.8 mAh g −1 at the current density of 1 A g −1 and a capacity retention rate after 1500 cycles is 83.9% at the large current density of 10 A g −1 . Additionally, an asymmetric supercapacitor was assembled with NiCoMn LDH 3:1 as the positive electrode and AC as the negative electrode. The prepared NiCoMn-LDH 3:1//AC ASC device showed a high energy density of 64.3 Wh kg −1 at 799.9 W kg −1 . Meanwhile, NiCoMn-LDH 3:1//AC ASC devices have excellent cycle stability, with a capacitance retention rate of 85.1% of the initial capacity after 5000 cycles at a high current density of 10 A g −1 . This work provides a new idea for the development of supercapacitor materials .
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Catalysis Science & Technology
·
2023
·Vol. 13
·期 7
·2101-2107
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IF 5
Jianhao Qiu,Lu Zhang,Guanglu Xia,Dingliang Dai,Yong Tang,Jianfeng Yao
Different ligand functionalized UiO-66 (UiO-66-X, X = OH, (OH)2 and NH2) were prepared and then modified by ZnIn2S4 lamellas to form ZnIn2S4/UiO-66-X heterostructures for visible-light-driven H2O2 evolution in pure water. The H2O2 yields using ZnIn2S4/UiO-66-NH2, ZnIn2S4/UiO-66-(OH)2 and ZnIn2S4/UiO-66-OH are 799, 733 and 165 μmol L−1, respectively, which are 9.5, 8.7 and 2.0 times that of ZnIn2S4/UiO-66. The high performance of ZnIn2S4/UiO-66-NH2 and ZnIn2S4/UiO-66-(OH)2 is ascribed to the benign visible-light response and Z-scheme heterostructures, and the H2O2 evolution abides by indirect O2 reduction with ˙O2− as an intermediate species. Additionally, H2O2 yields using ZnIn2S4/UiO-66-NH2 on tap water and Xuanwu Lake (Nanjing, China) water can be comparable to that on the above-deionized water. This study sheds light on the great promise of functionalized MOFs and their applications on green (photo)catalytic energy conversion.
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RSC Advances
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2022
·Vol. 12
·期 55
·35666-35675
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IF 4.036
Junhao Hu,Qiong Yi,Ziyi Xiao,Feng Tian,Tingting Shu,Xiaolan Liu,Yingxi Wang,Ling Li,Jiangang Zhou
Doxorubicin (DOX) has been an emerging environmental pollutant due to its significant genotoxicity to mankind. Advanced oxidation processes are a potential strategy to remove DOX in water solution. To develop a highly efficient catalytic agent to remove DOX, bimetal MOFs were synthesized, with Cu2+ and Co2+ as the central ions and adenine as the organic ligand. This study investigated the degradation of DOX by Co/Cu-MOFs combined with peroxymonosulfate (PMS). It was found that the degradation of DOX by Co/Cu-MOFs can reach 80% in only 10 seconds. This can be explained by the charge transfer from Co(III) to Co(II) being accelerated by Cu2+, resulting in the rapid generation of free radicals, which was proved by the EIS Nyquist diagram. Co/Cu-MOFs can be reused by simply washing with water without inactivation. Therefore, Co/Cu-MOFs can be used as an efficient catalytic agent to degrade DOX in environmental water.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Lijuan Guo,Wen Chen,Cuiqiong Wang,Boran Dong
The CH 4 -CO 2 reforming reaction can realize the utilization of both CH 4 and CO 2 , which is important to control the greenhouse effect and protect the environment. The development of low-cost, high-activity and high-stability reforming catalysts is the focus of research. This work used electrochemical methods to synthesize Cu 3 (BTC) 2 in high yields. Cu 3 (BTC) 2 was subsequently used as a precursor and Cu 3 P was synthesized by direct phosphorylation at different temperatures. Both high and low phosphatization temperatures can reduce the hydrogen precipitation performance of the prepared catalyst. In the CH 4 -CO 2 reforming reaction, the Cu 3 P catalyst prepared at elevated temperature has more excellent activity and stability. However, the activity of the catalyst did not keep increasing with the increase of temperature. After the CH 4 -CO 2 reforming reaction at 700 ℃ for 6 h, the conversion of Cu 3 P-350 did not change significantly, and the stability was significantly higher than that of Cu 3 P-300 and Cu 3 P-325. At the same time, when the phosphating temperature is lower than 375 ℃ Cu 3 P carbon accumulation are less. The amount of carbon accumulation increases when the phosphating temperature reaches 400 °C.
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Frontiers in Chemistry
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2022
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IF 5.545
Liu Yangqing,Sun Jingwen,Fan Lan,Xu Qi
Subnanometer noble metal clusters have attracted much attention because of abundant low-coordinated metal atoms that perform excellent catalytic activity in various catalytic processes. However, the surface free energy of metals increases significantly with decreasing size of the metal clusters, which accelerates the aggregation of small clusters. In this work, new Schiff base–imidazole-functionalized MOFs were successfully synthesized via the postsynthetic modification method. Highly dispersed Pd clusters with an average size of 1.5 nm were constructed on this functional MOFs and behaved excellent catalytic activity in the Suzuki coupling of phenyboronic acid and bromobenzene (yield of biaryl >99%) under mild reaction conditions. Moreover, the catalyst can be reused six times without loss of activity. Such catalytic behavior is found to closely related to the surface functional groups that promote the formation of small Pd0 clusters in the metallic state.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
·
IF 14.224
Zhen Huang,Chao Xiong,Lingri Ying,Welong Wang,Shixing Wang,Jing Ding,Jianfeng Lu
Lead ions in water have notorious effects on humans and environment. It is important to design an adsorbent with high adsorption capacity and reproducibility for efficiently removing Pb (II)ions from polluted water. Here, a novel Ti-based MOFs material (BDB-MIL-125(Ti)@Fe 3 O 4 ) was prepared by modifying NH 2 -MIL-125(Ti) with sulfhydryl and amino groups. Due to the large number of active sites, the maximum Pb (II) adsorption capacity of BDB-MIL-125(Ti)@Fe 3 O 4 was 710.79 mg/g at 25 °C and pH = 6 within 120 min corresponding to a maximum removal rate of 95.68%. The adsorbent also has extremely high selectivity and good cycling adsorption performance. The adsorption isotherms and kinetics agree with the Langmuir and the pseudo-second-order models, indicating that the process was chemisorption . Thermodynamic studies prove that spontaneous processes enhance Pb (II) adsorption at higher temperatures. DFT and FMOs calculations were used to discuss the adsorption mechanism. The sulfhydryl groups on the surface of organic ligands have a stronger affinity for Pb (II).
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Biosensors-Basel
·
2022
·Vol. 12
·期 9
·745
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IF 5.743
Li Gao,Yixi Deng,Haolu Liu,King Solomon,Bianjiang Zhang,Huimei Cai
Tea is an important economic crop and health beverage in China. The presence of heavy metal ions in tea poses a significant threat to public health. Here, we prepared an aptamer biosensor labelled with AIEgen nanospheres to detect Pb2+in tea. The dsDNA modified by amino and phosphoric acid was combined with the carboxylated AIEgen NPs to form AIEgen-DNA with a fluorescence group, which was then fixed to the surface of Zr-MOFs to quench the fluorescence of AIEgen NPs. At the same time, PEG was added to remove nonspecific adsorption. Then Pb2+was added to cut the DNA sequences containing the cutting sites, and AIEgen NPs and part of the DNA sequences were separated from the Zr-MOFs surface to recover the fluorescence. By comparing the fluorescence changes before and after adding Pb2+, the detection limit of Pb2+can reach 1.70 nM. The fluorescence sensor was applied to detect Pb2+in tea, and the detection results showed that the tea purchased on the market did not contain the concentration of Pb2+within the detection range. This study provides new insights into monitoring food and agriculture-related pollutants based on fluorescent biosensors.Keywords:lead ions;fluorescent biosensors;metal-organic frames;tea
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
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IF 9.136
Aotian Gu,Peng Wang,Kaiwei Chen,Elvis Djam Miensah,Chunhui Gong,Yan Jiao,Ping Mao,Kai Chen,Jinlong Jiang,Ying Liu,Yi Yang
Based on two topologically distinct MOFs, the core–shell bimetallic MIL-101/ZIF-67 x (M/Z x ) were successfully prepared to activate the self-decomposition of peroxymonosulfate (PMS) for 2-chlorophenol (2-cp) degradation. The M/Z x not only inherited the merits of single-metal MOFs such as high surface area and pore volume, but also exhibited superior catalytic performance. In the M/Z x /PMS system, 90% of the 2-cp (100 mg/L) was removed within 10 min with a reaction rate of 0.241 min −1 . This observation was attributed to the synergistic catalysis of cobalt and iron active sites in M/Z x , which greatly promoted the Co 2+ /Co 3+ redox cycle, thereby enhancing the catalytic performance. Further investigation found that both radical and non-radical pathway jointly promote the degradation of 2-cp, and the singlet oxygen ( 1 O 2 ) mediated non-radical pathway serve a predominant role. Meanwhile, SO 4 ·- and · OH also accelerated this process. The possible degradation pathway was proposed by identifying the intermediates of 2-cp degradation. This work provides some new ideas for the design of multi-metal MOFs for environmental remediation.
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