RESEARCH ON CHEMICAL INTERMEDIATES
·
2017
·Vol. 43
·期 7
·3961-3974
·
IF 1.369
Jiao Yinchun,Zhu Man,Deng Renjie,Jian Jian,Yin Yi,You Kuiyi
With the increase in environmental awareness, developing a highly efficient and environmentally benign nitration process has very important academic and applied industrial values in the synthesis of nitro-compounds. Towards this goal, we have developed an efficient and environmentally friendly approach for solvent-free liquid phase nitration of toluene by employing NO 2 as a nitrating agent and sulfated SO 4
2− /WO 3 as a catalyst replacing traditional nitric acid–sulfuric acid under mild conditions. The results indicate that SO 4
2− /WO 3 as an effective and eco-friendly catalyst exhibits excellent catalytic activity and reusability for the nitration of toluene with NO 2 . In addition, the possible pathway for liquid phase nitration of toluene with NO 2 over sulfated SO 4
2− /WO 3 catalyst was suggested. The present method makes this nitration process safe and environmentally friendly, and has the potential to enable a sustainable production of nitro-compounds from the liquid phase nitration of aromatic hydrocarbon with NO 2 in industrial applications.
研究领域:
催化化学
·
绿色化学
·
有机合成
·
环境友好工艺
·
工业化学
✓ 已验证
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2013
·Vol. 27
·期 2
·411-420
·
IF 0.702
Guo Fengying,Wu Xiaomin,Ji Guijuan,Xu Jijing,Zou Lianchun,Gan Shucai
A novel composed W-type hexaferrite Ba 1− x
La
x
Co 2 Fe 16 O 27 was rapidly synthesized via a sol–gel self-combustion reaction. The effects of lanthanum ions on the oxidation state of iron ions and cobalt ions in hexaferrite were explored by X-ray photoelectron spectroscopy. The changes of the Fe 2p X-ray absorption spectra indicated that the nonequivalent substitution can lead to the transition Fe 3+ → Fe 2+ in Ba 1− x
La
x
Co 2 Fe 16 O 27 . However, the oxidation state of cobalt ions was maintained as Co 2+ . Moreover, the effects of La content on the phase composition, structural parameters, morphology, and static magnetic properties were also investigated in detail by using the X-ray diffractometer, scanning electron microscope, and vibrating sample magnetometer. The results indicated that the structural parameters decreased regularly with increasing the La content, and the magnetic properties were enhanced after substitution, which is beneficial for their application in various electrical devices employed for industrial and military applications.
研究领域:
材料科学
·
无机化学
·
磁性材料
·
固体物理
·
功能材料
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 4
·1011-1021
·
IF 5.934
Junping Ma,Qiuyu Zhao,Dongli Wei,Haiqiang Liu,Xiangke Wang,Zhe Chen,Jianjun Wang
The adsorption remediation of radioactive contamination from wastewater is scientifically and economically important. In this work, titanium dioxide-modified manganese dioxide (MnO2@TiO2) was prepared by immobilizing crystalline anatase titanium dioxide (TiO2) on the surface of alpha manganese dioxide nanowire (MnO2). The base material MnO2 nanowire acted as a physical template for the guest TiO2, and the formed MnO2@TiO2 composite exhibited a highly uniform core–shell nanorod structure. The MnO2@TiO2 composite was investigated as an efficient adsorbent for the removal of U(VI) from aqueous solution. In the same system, MnO2@TiO2 exhibited a much higher maximum adsorption capacity (105.3 mg g−1) for U(VI) as compared with MnO2 (13.3 mg g−1), showing that the performance of the surface-modified MnO2 was greatly improved. The fitting results for kinetic and isothermal models manifested that U(VI) ion adsorption by MnO2@TiO2 involved monolayer chemisorption. Characterization before and after adsorption was performed and the results compared and analyzed carefully, with the conclusion that there might be three kinds of interactions between U(VI) and MnO2@TiO2 during the adsorption process, namely inner-sphere surface complexation, chemical precipitation, and electrostatic interaction. The low-cost, facile fabrication method and efficient performance endow the adsorbent MnO2@TiO2 with a high potential for U(VI) removal from actual wastewater.
研究领域:
环境科学
·
材料科学
·
核废物处理
·
水污染控制
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Jinchen Ma,Yingjie Mi,Fan Wang,Chaohe Zheng,Haodong Huang,Haibo Zhao
In the chemical looping combustion of chlorine-rich biomass or coal, a trace element, chlorine, will cause serious corrosion of oxygen carriers and heat exchange equipment in boilers. To address this issue, we design Ca- and Ba-decorated oxygen carriers to achieve two goals: on one hand, reducing the concentration of chlorine-containing gases by in situ dechlorination; on the other hand, employing protective materials to preferentially bind with gaseous chlorine to safeguard the active components of the oxygen carriers. Carefully designed experiments are conducted under simplified experimental conditions using 50 ppmv HCl-containing CH4 to evaluate the intrinsic characteristics of oxygen carriers in terms of dechlorination efficiency and reactivity. The results demonstrate that both the reaction performance and the chlorine-resistance performance of Ca–Cu and Ba–Cu composite oxygen carriers are significantly improved. This is because (a) Ca and Ba preferentially form chlorides with HCl, effectively shielding the active Cu component of the oxygen carrier from chlorine poisoning and (b) the specific surface area and pores of Ca/Ba-decorated oxygen carriers are increased, which not only strengthens the heterogeneous reaction between oxygen carrier and combustible gas but also improves the chemical looping combustion performance. The Cl-resistant oxygen carriers, Ca–Cu and Ba–Cu, emerge as promising candidates for the chemical looping combustion of fuels with high chlorine content.
研究领域:
能源化学
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2011
·
IF 3.723
Hui Wang,Yuming Huang
Prussian-blue (PB)-modified γ-Fe 2 O 3 magnetic nanoparticles (PBMNPs) were successfully synthesized based on electric interactions between negatively charged [Fe(CN) 6 ] 4− and positively charged γ-Fe 2 O 3 nanoparticles. The in situ PB coating was generated by the coordinating reaction between the adsorbed [Fe(CN) 6 ] 4− and the ferric ions on the surface of γ-Fe 2 O 3 NPs. The as-prepared PBMNPs were characterized by FT-IR, XRD, TEM, and used to remove organic pollutants from aqueous solution, namely, using methylene blue (MB) as model compound. The experimental results showed that the target compound could be removed efficiently from solution over a wide pH range from 3 to 10 in the presence of PBMNPs as peroxidase-like catalyst and H 2 O 2 as oxidant. Under optimal conditions, MB could be removed completely after 120 min of reaction at 298 K; the chemical oxygen demand (COD) removal efficiency and the total organic carbon (TOC) abatement efficiency were 53.6% and 35%, respectively. Furthermore, the PBMNPs catalysts showed high magnetization, temperature tolerance, long-term storage and operational stability, and they could be readily separated from solution by applying an external magnetic field. Finally, a possible reaction mechanism for MB degradation was also discussed.
研究领域:
环境科学
·
纳米材料学
·
催化化学
·
水处理技术
·
环境功能材料
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Dandan Lv,Yan Wang,Hui-qiang Li
Tetracycline hydrochloride (TC-HCl) was harmful to human as well as ecology due to its persistence. Layered double hydroxides (LDHs), granular activated carbon (GAC) and graphene oxide (GO) were selected as the catalyst supporting materials for the three-dimensional heterogeneous electro-Fenton (3D-EF) process. The three materials were then used to prepare catalyst particles of GAC@Fe 3 O 4 , LDHs@Fe 3 O 4 and GO@Fe 3 O 4 to degrade TC-HCl. The characterizations of the LDHs@Fe 3 O 4 (8:2) particles were done by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and Brunauer– Emmett–Teller. At pH of 3, the proper ratio of supporting materials (LDHs, GO, GAC) to Fe 3 O 4 improved the removal efficiency of TC-HCl. GAC@Fe 3 O 4 (8:2), LDHs@Fe 3 O 4 (8:2) and GO@Fe 3 O 4 (2:8) obtained better performance, LDHs and GO used as supporting material had better performance than GAC. Further study on the effect of different pH values showed that the LDHs@Fe 3 O 4 (8:2) acquired the highest chemical oxygen demand (COD) removal efficiency (63.03%) at pH of 7. LDHs@Fe 3 O 4 (8:2) and GO@Fe 3 O 4 (2, 8) obtained similar COD removal efficiencies at pH of 3. The percentage of Fe 2+ leaching to solution was 2% for the LDHs@Fe 3 O 4 , which was 2.9% for the GAC@Fe 3 O 4 and 5.46% for the GO@Fe 3 O 4 . Experimental results showed that more H 2 O 2 and • OH were produced on the surface of the LDHs with pH of 7. Finally, GC-MS was used to determine the degradation pathway of TC-HCl. The LDHs had obvious advantages as catalyst supporting materials for the 3D-EF process.
研究领域:
环境工程
·
水处理技术
·
催化化学
·
环境污染与控制
·
材料科学
·
环境功能材料
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2016
·Vol. 8
·期 7
·1399-1409
·
IF 4.724
Juan Yang,Xiaoxiao Shen,Yingjie Li,Linyan Bian,Jun Dai,Dongsheng Yuan
The selective conversion of alcohol into aldehyde in water was achieved over Bi 2 WO 6 -reduced graphene oxide (RGO) photocatalysts. The Bi 2 WO 6 -RGO-H catalysts were synthesized by an electrostatic self-assembly method followed by hydrothermal reduction. It was found the valence band and conduction band edges of Bi 2 WO 6 -RGO-H underwent a continuous increase in energy with the increasing weight ratio of graphene oxide, which resulted in a high selectivity to aldehydes. Furthermore, Bi 2 WO 6 -RGO samples with different degrees of reduction of RGO were prepared, and the conversion of alcohol was influenced greatly by the RGO reduction degree. Based on the results of photo-electrochemistry and photoluminescence spectroscopy, the clear enhancement in alcohol conversion can be ascribed to the efficient separation of photogenerated charge carriers, which results from the fast migration of photoelectrons between excited Bi 2 WO 6 and highly reduced RGO. Additionally, based on the results of radical-trapping and ESR spectroscopy, the primary reactive species and a plausible pathway for alcohol oxidation over Bi 2 WO 6 -RGO were proposed. Graphical Green synthesis : Highly selective and efficient conversions of alcohols into aldehydes can be achieved in aqueous suspensions of Bi 2 WO 6 -reduced graphene oxide (RGO) under artificial solar light irradiation. The selectivity to the product aldehydes can be tuned with the weight ratios of graphene oxide, and the conversion of reactant alcohols can be controlled by the reduction degree of RGO.
研究领域:
光催化化学
·
纳米材料科学
·
环境功能材料
·
绿色合成
·
有机转化催化
·
半导体光催化剂
·
界面电荷传输
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2020
·Vol. 13
·期 1
·1-15
·
IF 12.264
Tian Yuhui,Xu Li,Li Meng,Yuan Ding,Liu Xianhu,Qian Junchao,Dou Yuhai,Qiu Jingxia,Zhang Shanqing
Interface engineering of heterogeneous CoS/CoO nanocrystals and N-doped graphene composite facilitates high-performance oxygen reduction reaction and oxygen evolution reaction.
Density functional theory calculations and experimental results confirm the enhanced electrocatalytic performances via the proposed interface engineering.
The bifunctional oxygen electrocatalyst exhibits excellent performances in rechargeable Zn–air batteries.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
催化化学
·
先进电池技术
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2024
·Vol. 67
·期 4
·1332-1339
·
IF 6.8
Zhang Shunyao,Wang Lukai,Feng Junzong,Jiang Yonggang,Li Liangjun,Hu Yijie,Feng Jian
Silica aerogels exhibit considerable potential for thermal insulation applications owing to their low thermal conductivity. However, they generally possess poor mechanical properties and need to be mechanically enhanced while maintaining their low thermal conductivity. In this study, commercial fumed silica and methyltrimethoxysilane were used as the silica sources and water and ethanol were used as solvents to form a slurry. Consequently, silica aerogel monoliths (SAMs) were prepared through ambient drying without additional surface modification or solvent replacement. The resulting SAM maintained a typical nanopore structure and exhibited low density (0.24 g cm −3 ), shrinkage (4%), and thermal conductivity (0.046 W m −1 K −1 ). The slurry was impregnated with fiber blankets via roller pressing, and silica aerogel blankets (SABs) were prepared through thermal solidification of the slurry and ambient drying. The prepared SABs exhibited good flexibility and mechanical properties, facilitating their installation and application for thermal insulation and considerably reducing production cycles and costs. In addition, controlling the particle size and mass fraction of opacifiers decreased the high-temperature thermal conductivities of SABs owing to the nanopore structure and low shrinkage of SAMs, and the thermal conductivity of the optimized SAB at 800°C was as low as 0.054 W m −1 K −1 .
研究领域:
材料科学
·
纳米技术
·
热工学
·
复合材料
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 9
·3933-3950
·
IF 3.3
Li Xiaojun,Xia Yudong,Xu Yangzhou,Li Haitao,Huang Jiangchao,Yao Jie,Zhao Heng,Gao Xinhua,Yu Jinghao,Guo Lisheng,Li Jie
Thermocatalytic conversion of redundant CO 2 to useful methanol is an attractive route to address both energy and environmental crises simultaneously. However, existing copper/oxide catalysts widely used in these thermocatalytic processes still suffer from low methanol yield under mild reaction conditions. In this work, we design inverse oxide/Cu catalysts to achieve superior thermal catalytic performance for CO 2 hydrogenation. The optimized ZnO/Cu-1.0 catalyst exhibits maximum CH 3 OH selectivity of 83.4% and space–time yield (STY) of \(170.9\;{\text{g}}_{{{\text{CH}}_{3} {\text{OH}}}} \;{\text{kg}}_{{{\text{cat}}}}^{ - 1} \;{\text{h}}^{ - 1}\) in CO 2 hydrogenation at 210 °C, nearly twofold higher STY than the previous optimal inverse ZnO/Cu catalysts ( \(89.6\;{\text{g}}_{{{\text{CH}}_{3} {\text{OH}}}} \;{\text{kg}}_{{{\text{cat}}}}^{ - 1} \;{\text{h}}^{ - 1}\) at 250 °C). Importantly, ZnO/Cu-1.0 catalyst displayed not only a satisfactory catalytic stability but also a superior CH 3 OH STY with a time-on-stream of 24 h. Such inverse configuration of catalysts will pave the way for new strategies to design high-performance thermocatalytic catalysts and promote their commercialization. Graphical abstract Typical inverse ZnO/Cu-1.0 catalysts have been demonstrated and achieved to significantly facilitate the activation of inert CO 2 molecules to produce methanol, due to its special physicochemical properties and strong ZnO–Cu interaction
研究领域:
催化
·
化学工程
·
材料科学
·
环境科学
·
能量转换
✓ 已验证
DOI
高影响因子
Functional Materials Letters
·
2024
·
IF 1.2
Hui Wang,Nairan Li
The instability of lithium metal and insoluble discharging products, Li 2 O 2 , has been a formidable challenge that hinders the widespread implementation of lithium-air batteries (LABs). Hybrid electrolyte-based LABs have been proposed as one of the most promising strategies to solve these issues. However, the complex device designs together with a suitable solid electrolyte membrane is one of the key parameters that determine the battery run. Herein, we present a novel approach featuring a three-phase “organic-solid-aqueous” hybrid electrolyte for LABs, incorporating a NASICON-based solid electrolyte and zinc single atoms catalysts. It is clarified that Li 1 . 3 Al 0 . 3 Ti 1 . 7 ( PO 4 ) 3 (LATP) shows much-enhanced stability compared with the pulverization of Li 1 . 3 Al 0 . 3 Ge 1 . 7 ( PO 4 ) 3 (LAGP) by the reduction of Ge upon the Li + transport across. Combined with the bifunction of Zn SAs/CNF catalysts in ORR/OER, the 4 e − pathway has been proven to be established as a primary contributor to the battery’s high efficiency, which can well run over 100 h in the ambient air at room temperature. These innovative methodologies and insights hold promise for advancing the practical application of safe LABs and may extend to various air battery technologies.
研究领域:
储能技术
·
电化学
·
材料科学
·
电池技术
·
固态电解质
✓ 已验证
DOI
高影响因子
Water Supply
·
2018
·Vol. 18
·期 6
·2162-2169
·
IF 0.674
Hu Xuebing,Yu Yun,Lin Na,Ren Shuang,Zhang Xiaozhen,Wang Yongqing,Zhou Jianer
To obtain efficient salt rejection in saline solution treatment, an asymmetric graphene oxide/Al 2 O 3 membrane was prepared by a spin-coating process. According to microstructure measurement, the membrane has a multilayer structure and graphene oxide has been tightly coated on the surface of the Al 2 O 3 membrane interlayer homogeneously. During the treatment of different aqueous salt solutions, the permeation flux and salt rejection of the membrane were investigated. The results show the permeation flux of the membrane is about 1.254 L·m −2 ·h −1 ·bar −1 and the salt rejection of the membrane reaches 28.66%, 39.24% and 43.52% for 0.01 mol·L −1 NaCl, Cu(NO 3 ) 2 and MgSO 4 , respectively. The mechanism of the salt rejection of the membrane has been explained in this work. All these results indicate the GO/Al 2 O 3 membrane shows great potential in the desalination field.
研究领域:
材料科学
·
环境工程
·
膜技术
·
水处理
·
纳米材料
·
表面科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）