INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Enming Ping,Xiaoxiao Chen,Yunshan Zhou,Lijuan Zhang,Lingyun Kong,Nan Chen
In this work, CAU-10-H@γ-AlOOH is prepared, and then UTSA-16 is loaded on CAU-10-H@γ-AlOOH to obtain UTSA-16@CAU-10-H@γ-AlOOH. Using the as-prepared composites as stationary materials by cryogenic gas chromatography at 77 K, while CAU-10-H@γ-AlOOH achieves the complete separation of ortho-H2 (o-H2) and D2 with a resolution R of 1.66 and a separation time t of 9.52 min, UTSA-16@CAU-10-H@γ-AlOOH achieves higher efficiency separation of hydrogen isotopes in a shorter separation time (4.56 min) with R = 1.7. Molecular simulation results show that CAU-10-H has both chemical affinity quantum sieving and kinetic sieving effects for H2/D2 at 77 K, and UTSA-16 can only exert the kinetic sieving effect. UTSA-16’s load on CAU-10-H@γ-AlOOH weakens the adsorption of hydrogen isotopes, and the presence of Co2+ in UTSA-16 promotes the conversion of para-H2 to ortho-H2. In gas chromatography, H2 was preferentially desorbed from the system due to strong D2 adsorption caused by the chemical affinity quantum sieving effect and faster H2 diffusion caused by the kinetic sieving effect. These additive effects achieved efficient hydrogen isotope separation at 77 K.
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WASTE MANAGEMENT
·
2025
·
IF 7.1
Dongping Song,Tao Huang,Xiaolong Sun,Yun Xia,Chong Luo,Jialin Cui,Kai Chen,Weihua Liu,Jie Ren
The poor pozzolanic activity and high alkalinity of municipal solid waste incineration fly ashes (MSWI-FA) would deteriorate the stability of the MgO-SiO 2 -H 2 O (M−S−H) binder system, further inhibiting the treatment capacity of cement to wastes. In this study, sulfhydryl-functionalized graphene oxide nanoparticles (SFG) were synthesized and incorporated into the MSWI-FA-blended M−S−H (MSH-MSWI-FA) system to strengthen the solidification/stabilization (S/S) of both heavy metals (HMs) and chloride salts in the matrix and mechanical stability of cement. The linear increases in nanomaterials (from 0.5 % to 2.5 %) and MSH (from 40 % to 80 %) both decreased the concentrations of HMs and Cl anions leached from the solidified cubes in the MSH-MSWI-FA cementation. The least leaching concentration of Zn, Cu, Pb, Cd, Cr, and Cl were 0.0046 mg/L, 0.0032 mg/L, 0.014 mg/L, 0.00068 mg/L, 0.030 mg/L, and 0.36 g/L from the SFG-MSH-MSWI-FA cemented samples, respectively. The incorporation of graphene oxide nanoparticles (NGO) and SFG elevated the residual moieties of HMs, enhanced the mechanical strength and acid resistance, and improved the microstructural properties of MSH-MSWI-FA cementation. SFG played a more dominant role in the enhancement than NGO. Sulfhydryl-functionalization for nanomaterials intensifies the improvement process. The minerals including M−S−H, CaO-SiO 2 -H 2 O (C-S-H), and Phase-5 were formed in the MSH-MSWI-FA cement. Silica fume (SF), lightly burnt magnesia (CC-MgO), and MSWI-FA reacted with each other in a ternary system, which induced the self-alkali-activated cementation of C-S-H, M−S−H, and magnesium oxychloride (MOC) cement.
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JOURNAL OF ORGANIC CHEMISTRY
·
2025
·
IF 3.6
Yang Zhu,Guisheng Deng
The I2-catalyzed reaction of 1-(2-hydroxyphenyl)-propargyl alcohols with indoles and subsequent treatment with K2CO3 provided (benzofuran-3-yl)-1H-indoles in good to excellent yields with high regioselectivity. This one-pot and two-step strategy proved to be suitable for a wide range of substrates except for aliphatic alkynyl alcohols as well as the indoles bearing N-protected groups such as the Ts group possessing strong electron-withdrawing feature. The reaction procedure involved a cross-coupling and the construction of a benzofuran framework via 5-exo-dig cyclization.
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Catalysis Science & Technology
·
2019
·Vol. 9
·期 18
·5130-5141
·
IF 5.726
Shuang Song,Qiuxiang Liu,Jinhui Fang,Weiting Yu
The reductive dechlorination of chlorinated organic compounds (COCs) is very important to reduce the toxicity of waste effluents produced from pharmaceutical, electronics, dyestuff, pesticide, paper, and plastics industries. Electrochemical dechlorination as a green technology under mild reaction conditions is widely used in the reductive dechlorination of COCs using Pd as the electrode. Currently, the challenges of this method are the need to use large Pd loadings and the low dechlorination efficiency. Efforts were made in this work to reduce the loading of Pd and improve the efficiency using 2,4-dichlorophenoxyacetic acid (2,4-D) as a probe molecule for COCs in dechlorination. In this study, Pd-anchored Ni(OH)2/Ni-foam bifunctional electrodes were prepared in situ and for the first time applied in the reductive dechlorination of COCs. The results indicate that the dechlorination efficiency of 2,4-D can be enhanced on Pd-anchored Ni(OH)2/Ni-foam bifunctional electrodes even at a low Pd loading (<2 mg cm−2). A synergistic effect is found for 2,4-D dechlorination: H* formation on Ni(OH)2 and dechlorination steps on Pd. The enhanced dechlorination efficiency might be related to the shortened transport route between Ni(OH)2 and Pd active centers for H*.
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Sustainability
·
2021
·Vol. 13
·期 1
·434
·
IF 3.251
Kunlun Wang,Qian Hu,Yumin Wei,Hui Yin,Changhong Sun,Guizhong Liu
The emergent plants may differ in their capacity to assimilate nutrients from eutrophic water bodies, so the utilization of suitable emergent plants is the key part for successful restoration of shallow eutrophic lakes and rivers. This research applied the depletion method to study the kinetics of uptake of nutrient (H2PO4−,NH4+,NO3−) in different nutrient stresses by the five emergent aquatic plants (Acorus calamusL.,Typha orientalis, Lythrum salicariaL.,Sagittaria trifoliaL.,Alisma plantago-aquaticaLinn) in the riverine zones of Dashi River (39°30′–39°40′ N, 115°59′–116°5′ E), a shallow eutrophic river located in Fangshan District, Beijing. The results showed that at the three phosphorus levels,A. calamusandA. plantago-aquaticahad the highest maximum uptake rate values forNH4+under low to moderate phosphorus conditions, and high phosphorus, respectively.T. orientalishad the highest maximum uptake rate values forNO3−at all phosphorus concentrations, while the Michaelis-Menten constant values ofL. salicariaandA. plantago-aquaticawere smaller. At the three nitrogen levels, the maximum uptake rate values forH2PO4−were the greatest forA. plantago-aquaticaat the low to moderate nitrogen levels andL. salicariaat high levels. Meanwhile,T. orientalisandL. salicariahad the smallest Michaelis-Menten constant values. In this study, nitrogen microbial transformations, such as nitrification, denitrification and their coupling were not measured and their role in measuring kinetics was not assessed. Thus, achieved results shall be considered as a synthesis of several processes mediated by plants, a theoretical guidance to the selection of plant species for phytoremediation of polluted water bodies with different nutrient stresses for quality improvement around the diverse rivers in Haihe River basin.Keywords:emergent plants;eutrophication;nitrogen;phosphorus;uptake kinetics;stress
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ACTA BIOCHIMICA ET BIOPHYSICA SINICA
·
2024
·Vol. 57
·期 4
·604
·
IF 3.3
Xuewei Li,Jinghui Feng,Haiqin Cheng,Ning Jin,Shanshan Jin,Zhizhen Liu,Jun Xu,Jun Xie
Liver fibrosis is a critical stage in the progression of various chronic liver diseases to cirrhosis and liver cancer. Early inhibition of liver fibrosis is crucial for the treatment of liver disease. Hepatectomy, a common treatment for liver-related diseases, promotes liver regeneration. However, in the context of liver fibrosis, liver regeneration is hindered. Many studies have shown that mesenchymal stem cells (MSCs) can promote liver regeneration after partial hepatectomy (PH). However, there are few reports on the impact of MSC therapy on liver regeneration post-PH in the context of hepatic fibrosis. The objective of this study is to examine the impact of MSCs on liver regeneration following PH in the fibrotic liver and uncover the related molecular mechanisms. This study reveals that MSC therapy significantly enhances liver function and mitigates liver inflammation after PH in the context of hepatic fibrosis. MSCs also significantly promote liver regeneration and alleviate liver fibrosis. In addition, this study identifies the role of MSCs in promoting liver regeneration and alleviating liver fibrosis via the activation of Wnt/β-catenin signaling. The combination of MSCs with hepatectomy may offer a novel approach for the treatment of liver fibrotic diseases.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 17
·
IF 1.64
Qianqian Zhai,Shigui Zhao,Chuanjian Zhou,Wenjie Li,Cun Peng
To verify the feasibility of the determination of the Si H content (HC) of hydrogen silicone oil (HS-oil) with Fourier transform near infrared (FT-NIR) spectroscopy and attenuated total reflectance (ATR)–Fourier transform infrared (FTIR) spectroscopy combined with the partial least squares regression (PLS-R) model, HS-oil samples were synthesized from concentrated hydrosilicone oil (HC = 1.4 wt %), octamethylcyclotetrasiloxane, and hexamethyldisiloxane or prepared by the dilution of concentrated hydrosilicone oil with octamethylcyclotetrasiloxane. The FT-NIR PLS-R model (8695–4000 cm −1 , two principal components) was developed from the FT-NIR spectral data, and the coefficient of determination for cross-validation ( R 2 ) and the coefficient of determination for external validation ( r 2 ) were 0.992 and 0.995, respectively. The ATR–FTIR PLS-R model (2302–2040 cm −1 , one principal component) was developed from the ATR–FTIR spectral data; it produced an R 2 of 0.995 and an r 2 of 0.996. This study demonstrated that the combination of FT-NIR and ATR–FTIR spectroscopy with the PLS-R model were successfully used to determine the HC of the HS-oil. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40694.
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TALANTA
·
2013
·
IF 3.498
Zhiwei Sun,Xiaoxiang Wang,Yiping Cai,Junqing Fu,Jinmao You
A new pair of derivatization reagents, d 0 -4-(1-methyl-1 H -phenanthro[9,10- d ]imidazol-2-yl)phenlamine (d 0 -MPIA) and d 3 -4-(1-methyl-1 H -phenanthro[9,10- d ]imidazol-2-yl)phenlamine (d 3 -MPIA) have been designed and synthesized. It was successfully used to label aliphatic aldehydes and the aldehyde derivatives were analyzed by high-performance liquid chromatography–tandem mass spectrometry (HPLC–MS/MS). The new isotope-coded reagents could easily label aldehydes under acidic conditions in the presence of NaCNBH 3 . The target derivatives exhibited intense [M+H] + and regular product ions with electrospray ionization source in positive mode. The d 0 /d 3 -MPIA-aldehydes were monitored by the transitions of [M+H] + → m/z 322 and [M+H] + → m/z 165, and the obtained detection limits were in the range of 0.18–15.9 pg/mL at signal to noise ratio of 3. The global isotope internal standard technology was employed for quantification analysis with d 3 -MPIA-aldehyde as internal standard for corresponding d 0 -MPIA-aldehyde. Excellent linear responses for relative quantification were observed in the range of 1/10–10/1 with coefficients >0.998. The developed method has been applied to the quantification of aliphatic aldehydes in selected aquatic products with RSD<3.6% and recoveries >85.2%.
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