RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 10
·4257-4274
·
IF 3.3
Cao Wenbo,Ren Haitao,Cai Chaochen,Li Dashuai,Li Tingting,Lou Chingwen,Lin Jiahorng
Photocatalysis is a promising technology for wastewater treatment. It is a key problem to develop photocatalytic materials that can efficiently remove tetracycline (TC) under weak light intensity. This article synthesized the UiO-66-NH 2 /Bi 2.15 WO 6 heterojunction using a solvothermal method, and its specific surface area increases by 2.1 times relative to Bi 2.15 WO 6 , endowing good adsorption capacity for TC. Compared with Bi 2.15 WO 6 , the heterojunction effectively improves the separation of electrons and holes and enhances the photocatalytic performance. Under weak light intensity (4 mW cm −2 ), the removal percentage of 50 mg L −1 TC can reach 78.0%, attributing to a synergistic effect between adsorption and photocatalysis. The free radical capture experiment showed that TC was photodegradation mainly under the action of hole (h + ) and superoxide radical (·O 2 − ). Finally, through LC/MS analysis, it is inferred that TC is degraded into H 2 O and CO 2 after a series of reactions such as deamination, dehydroxylation, amide bond breaking and ring opening. This study provides insights for the synthesis of more powerful photocatalysts for TC removal.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 33
·e52810
·
IF 3.057
Zhirong Hu,Jiayu Miu,Xiong-Fei Zhang,Mingmin Jia,Jianfeng Yao
UiO-66-NH 2 (Zr-based metal organic framework) is integrated into cellulose acetate (CA) to fabricate mixed matrix membranes (MMMs) through solvent-casting approach. To regulate the interfacial compatibility and suppress the non-selective voids, UiO-66-NH 2 with different particle sizes are investigated. The introduction of UiO-66-NH 2 provides additional pathways for gas molecules and renders the membrane with high CO 2 affinity, substantially augmenting the separation efficiency of UiO-66-NH 2 @CA composite membrane. By optimizing the particle size of UiO-66-NH 2 , the non-selective voids and the particle agglomeration can be effectively restricted. The optimum separation performance is obtained by U-100@CA membrane (UiO-66-NH 2 : 200 nm in size), exhibiting a CO 2 permeability of 168.8 Barrer with CO 2 /N 2 and CO 2 /CH 4 ideal selectivities of 40.2 and 51.3, respectively. The separation mechanism is ascribed to the presence of sufficient amine groups, the high CO 2 solubility of CA matrix, and superior inorganic–organic interfacial property.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Tong Li,Caixia Cheng,Kaifeng Zhang,Jie Yang,Guangshuo Han,Xiuju Wang,Zhongpeng Wang,Liguo Wang
In this paper, the hydrophilic UiO-66-NH2 nanomaterial was synthesized by the solvent-thermal method and characterized. Then, UiO-66-NH2 was introduced into the casting membrane solution of cellulose acetate (CA) forward osmosis (FO) membrane, and CA/UiO-66-NH2 forward osmosis membrane was prepared by the phase inversion method. The optimum preparation conditions of CA/UiO-66-NH2 mixed matrix membranes were determined as follows: the content of UiO-66-NH2 was 0.4 wt%, the coagulation bath temperature was 35°C, the mixing temperature was 50°C and the heat treatment temperature was 50°C. FTIR, SEM, water contact angle and AFM were carried out on CA/UiO-66-NH2 forward osmosis membrane prepared under the best preparation conditions. Compared to the CA forward osmosis membrane, the permeability and selectivity of the CA/UiO-66-NH2 membrane were improved. The water flux and reverse salt flux of the CA/UiO-66-NH2 forward osmosis membrane reached 52.32 L/(m2·h) and 2.43 g/(m2·h), respectively. The permeability selectivity of CA membranes and CA/UiO-66-NH2 membranes did not change much during 180 min, indicating that the two membranes had good long-term stability. This study shows a potential advantage of UiO-66-NH2 as additives for improvement in the desalination performance of forward osmosis membranes.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Rui Duan,Hongjuan Wu,Jiahe Li,Zhaoxi Zhou,Weihua Meng,Lei Liu,Hongqiang Qu,Jianzhong Xu
Phosphor nitrile functionalized UiO-66-NH 2 /graphene (G-U-H) was prepared combined a green mechanochemical method and microwave-assisted rapid method to improve the fire safety of epoxy resin (EP). The scanning electronic microscopy, transmission electron microscope and X-ray diffraction results indicated that the G-U-H exhibited sandwich-like hybrid structure. And the -OH from graphene nanoplatelets and -NH 2 from UiO-66-NH 2 were grafted with hexachlorocyclotriphosphazene to form covalent bonds . The obtained flame retardant was added to the EP at a different content. The flame retardancy index and cure index of EP composites were calculated, and those of EP-3 were both good. The cone calorimetry test showed that the flame retardancy of EP was improved and the flame retardant mechanism is the combination of condensed phase and gas phase with the synergistic of P, N and other elements. The physical barrier of graphene nanoplatelets and the generated more stable and denser residual char in condensed phase can effectively cut off the heat and mass transmission. In gas phase, the non-flammable gases were generated to help reduce the heat released.
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MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Hangxi Liu,Haorong Sun,Ming Fang,Yifeng Zhang,Mingguang Kong,Zhimin Lv,Xiaoli Tan
The evaluation of the concentration of Pb(II) in solution has great significance in avoiding harm to ecology health. In this work, NH 2 -MIL-53(Fe) modified ITO glass (NH 2 -MIL-53(Fe)@ITO) was utilized as an electrochemical sensor for the detection of Pb(II) in solutions. FTIR and XPS investigation disclosed that the plentiful surface –NH group on the NH 2 -MIL-53(Fe) should be responsible for the highly efficient and selective detection abilities of Pb(II) due to the capture and conductivity abilities. The NH 2 -MIL-53(Fe) was prepared by a solvothermal technique and electrophoresed on the surface of ITO glass . A square wave voltammetry (SWV) method is employed for the sensitive determination of Pb(II). The factors of the detection condition such as the pH and ion interference are also studied. The sensitivity of 16.072 μA μM −1 cm −2 in the linear range of 2–4 μM and 54.143 μA μM −1 cm −2 in the linear range of 5–17 μM, and the limit of detection (LOD) of 0.1 μM are acquired. The repeatability and reproducibility are also studied. EIS and Tafel curves are utilized to investigate the effect of temperatures on the properties of the NH 2 -MIL-53. This work presents a facile strategy for the preparation of NH 2 -MIL-53(Fe)@ITO electrochemical sensor via electrolysis, which enhances the sensitivity toward Pb(II) and shows great application potential.
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ChemistrySelect
·
2023
·Vol. 8
·期 47
·e202303036
·
IF 2.1
Nan Liu,Binglian Zhu,Rutong Zhang,Weiqiao Zhong,Qibin Chen
Graphical NH 2 -silica-C 8 H 17 nanosheets containing short n-octyl chains and aminopropyl groups were investigated as a novel toughening agent for enhancing the toughness and strength of epoxy resin. The incorporation of 0.5 wt.% Janus nanosheets led to remarkable enhancements in the mechanical, dynamic mechanical, and thermal properties of the epoxy resin, as evidenced by the characterization results. In this work, a NH 2 -silica-C 8 H 17 Janus nanosheet with short n -octyl chains on one side and aminopropyl groups on the opposite side was prepared by the sol-gel method. This nanosheet was used to improve the toughness and strength of epoxy resin. The morphologies and structures of Janus nanosheets and the properties of NH 2 -silica-C 8 H 17 /epoxy nanocomposites were characterized. Results show that the addition of Janus nanosheets not only increases the storage modulus and glass transition temperature of nanocomposites, but also improves their mechanical performance and thermal stability. The tensile strength, elongation at break, fracture toughness and impact strength of nanocomposites are increased by ca. 57, 80, 74 and 63 %, respectively, at the 0.5 wt.% loading of Janus nanosheets. These findings suggest that NH 2 -silica-C 8 H 17 Janus nanosheets exert an effective influence on the toughness and strength of ultimate nanocomposites, which is attributed to the fact that NH 2 -silica-C 8 H 17 Janus nanosheet simultaneously contains n -octyl and aminopropyl groups on both sides, thus improving the nanosheet/matrix interface adhesion.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yangjie Fu,Kejie Zhang,Yi Zhang,Yanqing Cong,Qi Wang
Visible-light-active MR/NH 2 -MIL-125(Ti) homojunction was successfully synthesized via post-synthetic modification of NH 2 -MIL-125(Ti). A chromophore group (–MR) similar to the structure of methyl red, was introduced to partially replace the –NH 2 group. Using pure NH 2 -MIL-125(Ti) and MR-MIL-125(Ti) as control samples, the possible structural and optical changes were carefully studied. It was found that the lattice structure remained unchanged, while the specific surface area and band gap were in the order of NH 2 -MIL-125(Ti) > MR/NH 2 -MIL-125(Ti) > MR-MIL-125(Ti). Despite of these, MR/NH 2 -MIL-125(Ti) exhibited highest photocurrent response and lowest charge transfer resistance, which were associated with optimal photocatalytic performance. For the photocatalytic reduction of Cr(VI), the estimated rate constant on MR/NH 2 -MIL-125(Ti) was ca. 9 times and 3 times relative to that on NH 2 -MIL-125(Ti) and MR-MIL-125(Ti), respectively. Besides, 4.6 times rate enhancement can also be observed on the homojunction relative to physical mixture (MR/NH 2 -MIL-125(Ti)-PM). The boosted photocatalytic performance may be ascribed to promoted separation and transfer of photogenerated electron-hole pairs. The operating factors was optimized at acidic pH (2.0), lower catalyst dosage (0.1 g/L) and appropriate concentration of coexisting organics (2.0 mM) within the tested range. Furthermore, good stability both in photocatalytic performance and structure were also observed after 5 cyclic runs. Thus, this study report a facile way for the construction of visible-light-active MOFs, and provided a stable photocatalytic candidate for the disposal of Cr(VI)-containing wastewaters.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiaoxiao Chen,Mengyao Liu,Lijuan Zhang,Yunshan Zhou,Enming Ping,Chunyan Ding
ZIF-67@NH 2 –SiO 2 composites were prepared by loading the metal-organic frameworks ZIF-67 on amino modified SiO 2 gel particles (NH 2 –SiO 2 , 80–100 mesh) through layer-by-layer self-assembly method. Systematic investigation on the effects of ZIF-67 loading amounts on NH 2 –SiO 2 packed stainless steel chromatographic column (specification 1.0 m×2.0 mm I.D.), the flow rate of He as carrier gas and the injection amount of mixed gas (H 2 /D 2 ) on the hydrogen isotope H 2 /D 2 separation performance at liquid nitrogen temperature, unraveled the optimal conditions for H 2 /D 2 isotope separation . The results showed that the optimal stationary phase materials under the optimized conditions can effectively separate H 2 and D 2 with separation resolution R = 1.52 and the separation time t = 10.15 min. The superior performance of the ZIF-67 is tentatively thought to be due to kinetic quantum sieving (pore size 3.3 Å) effect and chemical affinity sieving effect of Co ion in ZIF-67.
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Journal of Materials Chemistry B
·
2021
·Vol. 9
·期 22
·4555-4566
·
IF 6.331
Wenhui Chen,Qiu Han,Yang Liu,Yiwen Wang,Fu Liu
Hyperphosphatemia, a common complication of chronic renal failure patients, is described as an excess amount of serum phosphate >4.5 mg dL−1. Current therapy for hyperphosphatemia is limited by low removal efficiency, secondary hyperparathyroidism, uremic bone disease, and the promotion of vascular and visceral calcifications. Metal organic frameworks (MOFs) have aroused great interest in the field of blood purification because of their strong specific adsorption. Herein, we prepared mixed matrix microspheres (MMMs) encapsulated NH2-MIL-101(Fe) with specific adsorption to blood phosphate. Simultaneously, a heparinoid copolymer poly (acrylic acid-sodium 4-vinylbenzenssulfonate) (P(AA-SSNa)) was incorporated to improve the hemocompatibility. The proposed MMMs exhibited excellent phosphate adsorption capacity both in aqueous and human plasma environments. They also showed comprehensive hemocompatibility e.g. low tendency of protein adsorption, low hemolysis rate and extended blood coagulation time. In general, we envision that the MMMs are potentially suitable as highly efficient hemoperfusion adsorbents for hyperphosphatemia treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yawen Tan,Yi Zhou,Yuehong Deng,Haiqin Tang,Hao Zou,Yifeng Xu,Jiaxin Li
The introduction of metal-organic frameworks into semiconductor photocatalysts is one of the strategies to improve the separation efficiency of electron-hole pairs. In this study, UiO-66-NH 2 /Bi 2 WO 6 nano-heterojunction was constructed for the first time by introducing UiO-66-NH 2 into the Bi 2 WO 6 precursor solution. A series of characterizations such as XRD , XPS and FT-IR have indicated that the successful synthesis of the composites and showed that UiO-66-NH 2 and Bi 2 WO 6 are tightly connected and interacted. SEM results showed that the introduction of UiO-66-NH 2 can increase the distance between bismuth tungstate nanosheets and effectively inhibit the agglomeration of Bi 2 WO 6 . The visible light degradation efficiency of 6% UiO-66-NH 2 /Bi 2 WO 6 can reach 99.7%. The improvement of photocatalytic activity could be attributed to the formation of a type II heterojunction in the composite, which effectively promoting the separation of electron and holes.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 2
·1-11
·
IF 5.833
Li Jingxian,Jiang Ding,Shan Xueling,Wang Wenchang,Ou Guofu,Jin Haozhe,Chen Zhidong
A novel aptasensor has been fabricated based on the resonance energy transform (RET) system from MoS 2 QDs-PATP/PTCA (donor) to NH 2 -UiO-66 (acceptor). The electrochemiluminescence (ECL) signal of PTCA was greatly amplified due to the decoration of MoS 2 QDs-PATP, and the NH 2 -UiO-66 was utilized to label the signal probe DNA (pDNA), which hybridizes with the exposed aptamer anchored on the surface of MoS 2 QDs-PATP/PTCA. With the target acetamiprid, the specific binding of acetamiprid to aptamer causes the connection between the donor and the acceptor to be interrupted and produce an “on” ECL signal. Thus, an “off-on” ECL sensing platform for sensitive and selective acetamiprid assay was designed. Under the optimal condition, the ECL signal of the aptasensor was found to be linearly related to the logarithm of the acetamiprid concentration ranging from 0.1 fM to 0.1 μM with a detection limit of 0.064 fM. More importantly, the recovery rate of the ECL aptasensor was calculated to be 98.7 ~ 106% with a RSD lower 5.1% for the residual acetamiprid assay in real food samples, which indicated that the aptasensor has high potential for practical applications. Graphical abstract
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CATALYSIS LETTERS
·
2020
·Vol. 151
·期 3
·734-747
·
IF 2.482
Zhang Xiaorui,Chen Chen,Jiang Caiyun,Zhou Haifei,Cao Wang,Wang Yuping
Abstract A new type of Ag 3 PO 4 /UiO-66-NH 2 Z-scheme heterojunction nanocomposite with visible light catalytic activity was successfully prepared. The synthesis of the composite was confirmed by XRD, FT-IR, SEM, TEM, EDS, XPS. The Ag 3 PO 4 /UiO-66-NH 2 Z-scheme heterojunction can effectively improve the utilization of visible light. The optimal Ag/U/1/4 composite has the highest degradation efficiency for methylene blue (MB, 30 mg/L) in 90 min (80%) and Norfloxacin (NOR, 10 mg/L) in 150 min (85%). The decrease of Nyquist radius and the enhancement of photocurrent response indicated that the combination of photogenerated electron–hole pair in Ag 3 PO 4 /UiO-66-NH 2 composite material is significantly inhibited. N 2 adsorption–desorption and zeta potential results indicated that biggish specific surface area and negative zeta potential value are more favorable for the adsorption of the cationic dye MB. The cyclic test verified the good stability of Ag 3 PO 4 /UiO-66-NH 2 heterojunction material. Furthermore, the photocatalytic degradation mechanism of MB was discussed by introducing different traps to inhibit the possible active substances in the degradation process. This work testified that an efficient photocatalytic composite based on metal–organic frameworks can be used for the degradation of pollutants. Graphic Abstract
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