COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
·
IF 3.99
Renqiang Cao,Shaoyuan Shi,Yujiao Li,Bin Xu,Zhijuan Zhao,Feng Duan,Hongbin Cao,Yujie Wang
Fouling of anion exchange membranes (AEMs) is the bottleneck restricting electrodialysis technology, and surface modification is an effective way to solve this problem. This paper investigated the effects of different components such as single poly (sodium 4-styrene sulfonate) (PSS), single polydopamine (PDA) and mixed polydopamine and poly (sodium 4-styrene sulfonate) (PDA@PSS) used as the modifier, respectively, on the surface properties and antifouling performance of AEMs. Comparing the surface properties of different modified AEMs, it was found that the surface hydrophilicity and negative charge density of PDA@PSS modified AEM (PDA@PSS-M) were obviously improved due to the combined action of PDA and PSS. The desalination rate, surface morphology and relative content of surface S element of different AEMs after the fouling experiments were also analyzed. The results indicated that PDA@PSS-M presented the greatest antifouling performance among three modified AEMs. The effect of PDA@PSS co-deposited layer on its desalination performance was negligible and the modification layer had relatively good stability.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2019
·Vol. 33
·期 5
·e4865
·
IF 3.259
Chao Duan,Chaoran Liu,Xin Meng,Wanli Lu,Yonghao Ni
In this work, we prepared high-performance and recyclable nanocatalysts that consist of small and well-dispersed silver nanoparticles (Ag NPs) immobilized onto Cu- based metal–organic framework (MOF-199 s) supported by carboxymethylated cellulose fibers (CCFs). The as-prepared green nanohybrid catalysts, namely Ag NPs@ MOF-199 s/CCFs, were characterized using SEM, TEM, XRD and FT-IR techniques. The catalytic performances showed that Ag NPs@ MOF-199 s/CCFs catalysts exhibited a very high catalytic efficiency towards the reduction of 4-nitrophenol to 4-aminophenol. The enhanced catalytic performances are attributed to the improved dispersity, small particles of Ag NPs stabilized by the MOF-199 s, and the porous catalyst structures. The introduction of cellulose fiber further facilitates the reuse and sustainability of the nanohybrid catalysts, showing a stable and high reusability (more than 91% of catalytic activity) even after five runs.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2019
·
IF 4.978
Fekadu Tadesse Bekena,Hairus Abdullah,Dong-Hau Kuo,Misganaw Alemu Zeleke
Novel Mg-doped Zn(O,S) nanoparticles were synthesized by a chemical precipitation process at 90 ℃ and the prepared nanoparticles were characterized by XRD, SEM, HRTEM, XPS, UV–vis, DRS, PL, EIS, and photocurrent response. The photocatalytic reduction for the 4-nitrophenol using Na 2 SO 3 under UV light irradiation showed that Mg–Zn(O,S)-2.5 exhibited higher activity compared with other samples. 96.7% of 4-nitrophenolate ion reduced into 4-aminophenol within 45 min. Mg–Zn(O,S)-2.5 was also tested for hydrogen evolution, where the rates of 1035 μmol/g for the 4-NP-free sample and 705 μmol/g for the 4-NP-added one were achieved. Finally, the stability and reaction mechanism was mentioned.
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Environmental Chemistry
·
2019
·Vol. 16
·期 8
·577-586
·
IF 2.193
Fang-Zhu Xiao,Cheng Wang,Li-Mei Yu,Yi-Qiu Pu,Yu-Li Xu,Kang Zhang,Jia-Qi Luo,Qi-Qi Zhu,Fang Chen,Yong Liu,Chun-Hsing Ho,Guo-Wen Peng,Shu-Ya He
Environmental context Uranium-containing wastewaters have high potential to harm the environment and human health. We found that the combination of calix[4]arene with magnetic Fe3O4 particles produced good adsorption of uranium from wastewater. In addition, this material can be recycled and reused, so it has good prospects in practical applications for uranium remediation. A magnetic functionalised calix[4]arene composite consisting of Fe3O4 and calix[4]arene phosphonate derivative (CPD) was prepared through a facile self-assembly method. The composite was characterised by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD) and Fourier transform infrared spectroscopy (FTIR). The as-synthesised Fe3O4/CPD composite was used to remove UVI from aqueous solutions under different conditions. Meanwhile, the adsorption isotherm, kinetics and thermodynamics were fitted and analysed. The results show that the Fe3O4/CPD composite may be a promising adsorption material for the separation and enrichment of UVI from aqueous solutions in the cleanup of environmental pollution.
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RSC Advances
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2018
·Vol. 8
·期 31
·17504-17510
·
IF 2.936
Nan Jiang,Xiao Zhou,Yi-Fan Jiang,Zhi-Wei Zhao,Liu-Bo Ma,Cong-Cong Shen,Ya-Nan Liu,Cheng-Zong Yuan,Shafaq Sahar,An-Wu Xu
The design and development of highly efficient and long lifetime Pd-based catalysts for hydrogenation reactions have attracted significant research interest over the past few decades. Rational selection of supports for Pd loadings with strong metal-support interaction (SMSI) is beneficial for boosting catalytic activity and stability. In this context, we have developed a facile approach for uniformly immobilizing ultra-small Pd nanoparticles (NPs) with a clean surface on a Pr6O11 support by a hydrogen thermal reduction method. The hydrogenations of p-nitrophenol and styrene are used as model reactions to evaluate the catalytic efficiency. The results show highly efficient styrene hydrogenation performance under 1 atm H2 at room temperature with a TOF value as high as 8957.7 h−1, and the rate constant value of p-nitrophenol reduction is 0.0191 s−1. Strong metal-support interaction and good dispersion of Pd nanoparticles, as demonstrated by XPS and HRTEM results, contribute to the excellent hydrogenation performance. Electron paramagnetic resonance (EPR) results suggest the presence of oxygen vacancies in the support, which serve as electron donors and enhance the adsorption and activation of reactants and subsequent conversion into products. Moreover, the catalyst can be recovered and reused up to 10 consecutive cycles without marked loss of activity. Overall, our results indicate that oxygen-deficient Pr6O11 nanorods (NRs) not only play a role as support but also work as the promoter to substantially boost the catalytic activities for organic transformations, therefore, providing a novel strategy to develop other high-performance nanostructured catalysts for environmental sustainability.
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PubMed
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 10
·e4511
·
IF 3.581
Yuanyuan Wang,Jicheng Xu,Dongya Yang,Tao Zhang,Fengxian Qiu,Jianming Pan
Calixarenes have been drawing tremendous interest due to their special structure, superior properties and numerous applications. In this work, a novel adsorbent material, calix[4]arenes functionalized dual-imprinted mesoporous film (DIMFs) for the simultaneous selective recovery of Li(I) and Rb(I), was prepared via surface ionic imprinting. Compared with ordinary adsorbent materials, the synthesis process of the films used a cheap bio-template and did not require extra steps but significantly enhances adsorption properties. The morphology and structure of prepared DIMFs were characterized by scanning electron microscopy, transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and nitrogen adsorption–desorption measurements. Adsorption parameters (pH and temperature), adsorption kinetics and adsorption isotherms of the DIMFs were investigated by adsorption experiments. This novel adsorbent has inorganic–organic hybrid frameworks, high specific surface area and uniform pore size. The Langmuir and Freundlich isotherms, pseudo-first-order and pseudo-second-order kinetics of DIMFs were investigated; suggesting that the adsorption data well fits the Langmuir isotherm model, and the adsorption kinetics can be described by the pseudo-second-order kinetic model. In addition, dual-imprinted mesoporous film exhibited superior selectivity for Li(I) and Rb(I). Cycle test demonstrated an outstanding of reusability, which appreciating their potential for industrial application.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Junhe Lu,Peizeng Yang,Wei Dong,Yuefei Ji,Qingguo Huang
Benzophenone-4 (BP4) is UV-filter that is widely in sunscreens and cosmetics to prevent skin damage from sunlight exposure. Washing off of BP4 from the human body in swimming pools represents a direct source of BP4 in the environment. In this study, we investigated the transformation of BP4 by free chlorine, chloramine, and UV/chlorine, which can be found in swimming pool water. It was found that BP4 can be rapidly removed by both chlorine and chloramine treatment, but only chlorination led to appreciable formation of chlorinated disinfection by-products (DBPs), such as dichloroacetic acid and trichloroacetic acid . However, chloramination of BP4 resulted in higher levels of chlorinated intermediates, which were relatively recalcitrant to further chlorination. The UV/chlorine process was significantly more efficient than the chlorine treatment alone for BP4 removal and resulted in trace chlorinated intermediates and formation of DBPs. Radical scavenger tests revealed that the removal of BP4 in the UV/chlorine process was mostly ascribed to reactions with the Cl and OH generated from HClO photolysis. The presence of methanol as a radical scavenger resulted in incomplete removal of BP4 in the UV/chlorine process and enhanced the formation of DBPs. The increase in DBP formation was because the residual BP4 can be exited to a triplet state ( 3 BP4 ∗ ) upon UV irradiation. 3 BP4 ∗ subsequently reacted with O 2 to form 1 O 2 , a reactive oxygen species that generated DBPs by reacting with chlorinated intermediates in water. All benzophenone-type UV-filters may have similar photochemical activity and thus influence the transformation of other organics in sunlit surface water environments.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 102
·期 3
·1414-1424
·
IF 2.956
Yaowu Wei,Tao Zhang,Qi Zhang,Bingqiang Han,Nan Li
Improving the hydration resistance of CaO aggregates is the key to successful application of lime-based refractories in metallurgical industry. Additive Zr(OH) 4 and Al(OH) 3 were introduced in the preparation of CaO granules using granulation equipment and calcination method in this study. The results showed that the hydration resistance of CaO granules was improved significantly, especially for granules with 0.6 wt.% Zr(OH) 4 and 0.9 wt.% Al(OH) 3 , respectively. The shell of CaO granules was relatively dense after calcination and the volume of open pores of CaO granules decreased from 3.56 × 10 −2 to 1.80 × 10 −2 cm 3 /g when additive was introduced. Zr(OH) 4 and Al(OH) 3 have the opposite effect on the closed porosity of CaO granules, the closed porosity of CaO granules was decreased with Zr(OH) 4 addition, but increased with Al(OH) 3 addition.
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CHIRALITY
·
2018
·Vol. 30
·期 11
·1225-1232
·
IF 1.833
Yinjun Zhang,Feifei Cheng,Hongde Yan,Jianyong Zheng,Zhao Wang
The kinetic resolution of (R,S)-1-(4-chlorophenyl)ethylamine was accomplished using a commercial lipase from Candida antarctica (Novozym 435). The performance of this lipase was investigated for the enantioselective amidation of (R,S)-1-(4-chlorophenyl)ethylamine, leaving the target product (S)-1-(4-chlorophenyl)ethylamine in its unreacted form. The effects of various types of solvents and an acyl donor, the molar ratio of the substrate to the acyl donor, and the reaction temperature were studied. The optimum reaction conditions were found to result in amidation with methyl 2-tetrahydrofuroate at 40°C in methyl tert-butyl ether, with a substrate/acyl donor molar ratio of 1:2.4. The conversion rate of (R,S)-1-(4-chlorophenyl)ethylamine was 52%, with an enantiomeric excess of 99% towards the unreacted substrate in a reaction time of 22 hours. Finally, using optically pure (S)-1-(4-chlorophenyl)ethylamine as the raw material, the chemical synthesis of (S)-N-(1-(4-chlorphenyl)ethyl)-2-(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-ylthio)acetamide, a novel triazolopyrimidine herbicide, was achieved, and the total yield and purity were 83.5% and 95.3%, respectively.
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CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Desheng Pan,Yong Li,Zheng Han,Bing Li,Chinwei Wang,Teng Yang,Da Li,Chuljin Choi,Zhidong Zhang
Incorporation of distinct organic molecules and inorganic fragments into a single crystalline lattice of organic–inorganic hybrid magnets has aroused much attention for novel physical properties and applications. Yet, there has been no report on the discovery of ordered organic–inorganic hybrid magnets with room-temperature magnetism. Here, we report a simple chemical solution method for synthesis of new organic–inorganic hybrid magnets built by organic Fe(teta)1.5 and inorganic FeSex segments. By changing the reaction temperature, the size of these hybrid nanostructures can be tuned from 100 nm to 4 μm, and their shapes vary from nanoparticles and nanobelts to nanoplates. Selected area electron diffraction and X-ray diffraction reveal that hybrid (β-Fe3Se4)4[Fe(teta)1.5] nanoplates are a single phase in a tetragonal crystal structure with the space group I4cm (108). The thermal magnetic curve between 5 and 900 K was characterized using a vibrating sample magnetometer, revealing room-temperature ferrimagnetism of the (β-Fe3Se4)4[Fe(teta)1.5] nanoplates with the Curie temperature (TC) higher than 530 K. In the case of hybrid nanoplates synthesized at 483 K, a giant coercivity value reaching 11 kOe is obtained at 5 K. Our study not only provides guidance for developing a chemical solution method for controllable fabrication of a new class of organic–inorganic hybrid materials but also enhances the magnetic ordering temperature of such magnetic organic–inorganic hybrid materials to be higher than room temperature.
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DYES AND PIGMENTS
·
2019
·
IF 4.018
Long Ma,Sixuan Xiao,Nan Wu,Shan Zhao,Debao Xiao
In the field of electrochromism , multicolor systems have ever been explored due to their potential applications in areas such as electrochromic displays. In this work, two benzene-centered organic salts, 4,4′,4''-(benzene-1,3,5-triyl)tris(1-propylpyridylium) bromide TPP 3+ 3Br − and 4,4′,4''-(benzene-1,3,5-triyl)tris(1-benzylpyridylium) bromide TBP 3+ 3Br −, were successfully synthesized and further incorporated as electrochromic materials to fabricate gel based all-in-one electrochromic devices (ECDs), respectively. It was found that, the ECDs based on these two materials displayed multicolor electrochromic behaviors, optical contrast was unambiguously exceeded 67.9%, coloration efficiency was as high as 327.7 cm 2 /C, and coloring voltage was less than −1.2 V. Considering the overall electrochromic performances of the 1,3,5-tris(4-pyridylium) bromides, it is expected that the multicolor ECDs may be applicable in the development of electrochromic enhancement of latent fingerprint based on the principle of color contrast for those deposited on the conductive and nonconductive substrates with a series of colors.
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BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
·
2018
·
IF 2.559
Fan Zhang,Chenhong Zhang
Intracerebral hemorrhage (ICH) is reported as a common and often fatal type of stroke accompanied with high morbidity and mortality, and it frequently results in long-lasting neurological dysfunctions. However, the pathogenesis that contributes to ICH has not been fully understood. Rnf112, also known as Znf179, is a member of the RING finger protein family. The expression of Rnf112 is abundant in the brain and is modulated during brain progression and development. The study aimed to explore the role of Rnf112 in brain injury after ICH, as well as the underlying molecular mechanisms. The results indicated that ICH led to a significant decrease in Rnf112, which was confirmed in oxyhemoglobin (oxyHb)-incubated astrocytes and microglial cells. Moreover, the Rnf112 knockout (Rnf112 −/− ) mice and wild type (WT) mice induced by ICH were further employed. Compared to the WT/ICH group, Rnf112 −/− mice exhibited accelerated brain injury, as evidenced by the increased brain water contents and neurological deficit scores (NDS). In comparison to WT/ICH group, a remarkable up-regulation in the release of pro-inflammatory cytokines, including tumor necrotic factor-α (TNF-α), interleukin-6 (IL-6), and IL-1β, was observed in perihematoma tissues of Rnf112 −/− mice on day 3 post-ICH. The process was along with promoted glial fibrillary acidic protein (GFAP) and Iba1 expression and reduced NeuN levels. Furthermore, ICH-induced increases in toll-like receptor (TLR)-4 and myeloid differentiation primary response protein (MyD88) expression were exacerbated by the loss of Rnf112. The phosphorylated expression of IKKα, inhibitor of NF-κB (IκBα) and nuclear factor-kappa B (NF-κB) induced by ICH in perihematoma tissues of mice was markedly enhanced in Rnf112 −/− mice. Rnf112 repression-induced inflammatory response was verified in lipopolysaccharide (LPS)-incubated glial cells . In contrast, over-expressing Rnf112 markedly attenuated ICH-induced brain injury by restraining inflammation via inactivating TLR-4/NF-κB pathway. In summary, our findings suggested that Rnf112 expression was highly involved in the progression of ICH, and targeting Rnf112 signaling might be a promising therapeutic strategy against ICH development.
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