CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2018
·
IF 1.712
Huifang Li,Lijuan Li,Xiaowu Peng,Lianmin Ji,Wu Li
The organic synergists, including Octanol, ethyl acetate (EA), butyl acetate (BA), methyl isobutyl ketone (MIBK), diisobutyl ketone (DIBK), N , N -bis(2-ethylhexyl) acetamide (N523) and 8-hydroxylquiolate, were added to the TBP–FeCl 3 extraction system to extract lithium from brine. The effects of concentration of organic synergist and total organic extractant, molar ratio of Fe/Li, phase ratio, counter-current extraction and the acidity of stripping agent on lithium extraction were investigated to optimize the extraction conditions. Under the optimize conditions, the results of counter-current extraction showed the mixed extraction system was the preponderance on the lithium extraction. Especially the separation of lithium in organic phase and aqueous phase and the separation mass ratio of Mg/Li increased greatly. An extraction mechanism was proposed based on the analysis of FT-IR spectra and Raman spectra.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Xinyu Peng,Xiaoxian Zhang,Hongrui Chen,Xiaoran Zhang,Chaohong Tan,Xiaojuan Bai,Yongwei Gong,Yang Qu,Haiyan Li,Ziyang Zhang
In recent years, the escalating attention on Pharmaceutical and Personal Care Products (PPCPs) and Heavy Metals in urban stormwater runoff highlights the critical role of Road-deposited sediments (RDS) as a significant carrier for pollutant occurrence and transport in runoff. However, existing research has overlooked the composite characteristics of PPCPs and Heavy Metals, hampering a holistic understanding of their transformation in diverse forms within runoff. This limitation impedes the exploration of their subsequent migration and conversion properties, thereby obstructing coordinated strategies for the control of co-pollution in runoff. This study focuses on the typical PPCP sulfamethoxazole (SMX) and heavy metal Cu(II) to analyze their occurrence characteristics in the Runoff-RDS system. Kinetics and isotherm studies reveal that RDS effectively accumulates SMX and Cu(II), with both exhibiting rapid association with RDS in the early stages of runoff. The accumulation of SMX and Cu(II) accounts for over 80 % and 70 % of the total accumulation within the first 240 min and 60 min, respectively. Moreover, as runoff pH values decrease, the initially synergistic effect between the co-pollutant transforms into an antagonistic effect. In the composite system, varying pH values from 2.0 to 6.0 lead to an increase in SMX accumulation from 4.01 mg/kg to 6.19 mg/kg and Cu(II) accumulation from 0.43 mg/g to 3.39 mg/g. Compared to the single system, the composite system capacity for SMX and Cu(II) increases by 0.04 mg/kg and 0.33 mg/g at pH 4.0. However, at pH 3.0, the composite system capacity for SMX and Cu(II) decreases by 0.21 mg/kg and 0.36 mg/g, respectively. Protonation/deprotonation of SMX under different pH conditions influences electrostatic repulsion/attraction between SMX and RDS. The mechanism of RDS accumulation of SMX involves Electron Donor-Acceptor (EDA) interaction, hydrogen bond interaction, and Lewis acid-base interaction. Cu(II) enrichment on RDS includes surface complexation reaction, electrostatic interaction, and surface precipitation. Complex formation enhances the accumulation of both SMX and Cu(II) on RDS in runoff. This study elucidates the co-occurrence characteristics and mechanisms of SMX and Cu(II) co-pollution in runoff systems. The findings contribute valuable insights to understanding the existence patterns and mechanisms of co-pollution, providing a reference for investigating the migration and fate of co-pollutant in runoff. Moreover, these insights could offer guidance for the development of effective strategies to mitigate co-pollution in rainwater.
研究领域:
环境科学
·
污染控制
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 35
·49026
·
IF 2.52
Gaofeng Zeng,Weiwei Zhang,Xin Zhang,Wenchao Zhang,Jianxin Du,Jiyu He,Rongjie Yang
A range of flame retardant vinyl ester resins (VERs) samples have been produced containing different contents of PEPA (1-oxo-4-hydroxymethyl-2,6,7-trioxa-l-phosphabicyclo[2.2.2]octane), APP (ammonium polyphosphate), and MoO 3 (molybdenum trioxide). By investigating the flame retardancy of VER samples such as limiting oxygen index and UL-94, the synergistic flame retardance of APP, PEPA, and MoO3 has been revealed. The cone calorimeter is an instrument that measures the combustion data of samples. In the VER composites on fire, the synergistic smoke suppression effect of the APP, PEPA, and MoO 3 was detected. The gas and condensed phase of VER composites with APP, PEPA, and MoO 3 were tested by the thermogravimetric analysis (TGA)–Fourier transform infrared spectroscopy (FTIR) and FTIR. The char residues of samples have been studied at length by scanning electron microscopy and FTIR. The results show that the presence of MoO3 can promote the formation of P O and PO structures.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION AND FLAME
·
2025
·
IF 6.2
Xin-xing Zeng,Si-jia Yu,Jun Wang,Jian Wang,Yu-qin Gan,Xian-feng Wei,Jie Chen,Xing-quan Zhang
Boron (B), a frequently utilized metalloid fuel, has been garnering growing attention due to its elevated calorific value. However, the inert oxide layer (B 2 O 3 ) on the surface of B powder obstructs the transfer of oxygen, resulting low combustion efficiency and long ignition delay time. In this study, a range of binary oxidizers BiF 3 -Bi 2 O 3 is developed to enhance the ignition and combustion performance of B by leveraging the synergistic effect of the shell-breaking effect of BiF 3 and the rapid reaction kinetics of Bi 2 O 3 . A comprehensive investigation is conducted on the influence of the BiF 3 /Bi 2 O 3 ratio on thermal reaction, ignition delay time, burning rate, and pressure output. The TG-DSC data indicate that the B-BiF 3 reaction exhibits superior gas production capability, while the B-Bi 2 O 3 reaction offers greater advantages in terms of heat release. Furthermore, the combination of binary oxidizers (10 wt.%-20 wt.% BiF 3 ) is more efficient in promoting the ignition and combustion of B than a single metal oxidizer. The B-BiF 3 -Bi 2 O 3 composite materials exhibit a remarkably high burning rate of 14.81 m/s and a rapid pressurization rate of 1622.45 kPa/s. The enhanced ignition and combustion performance of B-BiF 3 -Bi 2 O 3 composite materials arises from the synergistic effect between the reactions of B-BiF 3 and B-Bi 2 O 3 . This study illustrates that the combination of BiF 3 and Bi 2 O 3 , two types of oxidizers, is an effective method to improve the combustion efficiency of boron.
研究领域:
材料科学
·
燃烧与推进
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fengyu Tian,Wenhong Wang,Bin Liu,Yuan Pan,Bin Dong,Yichuan Li,Yanpeng Li,Hailing Guo,Yongming Chai,Chenguang Liu
The future implementation of ultralow sulfur fuel regulations requires researchers to have an excellent understanding of the mechanism of the synergistic effect between the Co(Ni) and (Mo)W sulfides in supported Co(Ni)Mo(W)S hydrodesulfurization (HDS) catalysts. This synergistic effect occurs when the distance between two metals is on the mm or nm scale. To investigate the promotion of HDS on the µm scale, a series of Co and Mo multilayer flake catalysts with a thickness of 1 mm were prepared by laminate molding. The distance between CoS x and MoS 2 in these specially structured catalysts was adjustable on the µm scale by controlling the order and quality of the catalyst powder. The results for the HDS of dibenzothiophene (DBT) demonstrate that there is an obvious synergistic effect between CoS x and MoS 2 on the µm scale. The results of pyridine IR spectroscopy indicate that this synergy is due to CoS x and MoS 2 synergistically generating more coordinatively unsaturated sites (CUSs) and -SH active sites at the μm scale, thus increasing the HDS activity. Moreover, the catalyst activity increases as the distance between CoS x and MoS 2 decreases, and the fact that the feed comes into contact with CoS x first greatly improves the activity.
研究领域:
催化化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2021
·Vol. 41
·期 1
·166-178
·
IF 4.003
Zhang Bo-Lin,Deng Li-Feng,Liu Bo,Luo Chun-Yun,Liebau Michael,Zhang Shen-Gen,Gläser Roger
Abstract Combining the redox properties of Co and the acid properties of Nb in a Co 3 -Nb-O x catalyst is shown to provide superior performance in the selective catalytic reduction of NO with NH 3 (NH 3 -SCR). Co 3 O 4 shows average activity, however, it exhibits a poor N 2 selectivity. Nb 2 O 5 is not active for NH 3 -SCR. However, the mixed Co 3 -Nb-O x catalyst shows higher NO conversion and N 2 selectivity than the single Co 3 O 4 and Nb 2 O 5 catalysts at 100–300 °C. The results of temperature programmed reduction by H 2 and X-ray photoelectron (XP) spectra indicate that the addition of Nb changes the chemical states of Co and decreases the concentration of Co 3+ and O α , adjusting the activity for catalytic oxidation to a moderate level. This suppresses the formation of undesired N 2 O from the over-oxidation of NH 3 . Incorporation of Co and Nb into one solid synergistically couples their redox behavior and surface acidity, ensuring the high catalytic activity and N 2 selectivity in NH 3 -SCR. Graphical Abstract
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Tianping Huang,Jianxin Zou,Ning Zhao,Xiaoqin Zeng,Wenjiang Ding
A new reversible hydrogen storage system, 3NaBH 4 -0.5ScF 3 -0.5YF 3 , was synthesized by using the ball-milling method. It is shown that no reaction occurs during the ball-milling process. The hydrogen desorption process of the ball-milled composite can be divided into three consecutive steps: (i) An initial stage from room temperature to 320 °C with about 0.42 wt% of hydrogen released, that can be ascribed to the substitution of H − by F − in NaBH 4 ; (ii) The second stage starts from 320 °C to 450 °C, releasing about 1.06 wt% of hydrogen; (iii) The final stage ranges from 450 °C to 480 °C, with 2.58 wt% of hydrogen released. The total yield of hydrogen reaches 4.06 wt% at 480 °C. The completely dehydrogenated products of the 3NaBH 4 -0.5ScF 3 -0.5YF 3 composite can absorb 2.15 wt% of hydrogen at 380 °C in 6.5 h, which shows greatly enhanced reversibility when compared with sole ScF 3 addition. It should be noted that one of the destabilizers ScF 3 was also regenerated besides NaBH 4 in the rehydrogenated products. Based on the XRD and FTIR analyses, the synergistic effects of 3d transition metal fluoride ScF 3 and rare earth metal fluoride YF 3 on the hydrogen desorption and absorption performance of NaBH 4 were discussed.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2016
·
IF 2.29
Ying Zhang,Ting-an Zhang,Guozhi Lv,Guoquan Zhang,Yan Liu,Weiguang Zhang
In the present study, the mechanisms and thermodynamics of vanadium extraction by a mixture of bis-2-ethylhexyl phosphorous acid (D2EHPA) and 2-ethylhexyl phosphorous acid mono-2-ethylhexyl ester (EHEHPA) from sulfate medium were investigated. It was found that the maximum synergistic factors obtained at X D2EHPA = 0.2 and the reaction of the synergistic extraction is exothermical. Results showed that the mixture system in the presence of complexing agents exhibit a higher extraction efficiency and require a lower acid consumption during the stripping process of vanadium. Fourier transform infrared (FT-IR) spectroscopy showed that P–O–H and P O of the extractants are responsible for the synergistic extraction of VO 2 + species by cation exchange mechanism and some hydrogen bonds between EHEHPA and D2EHPA formed in the synergistic extraction system. With the slope analysis method, the reaction of the synergistic extraction was mainly predicted.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 89
·73083-73090
·
IF 3.84
Kuiyi You,Renjie Deng,Jian Jian,Pingle Liu,Qiuhong Ai,He’an Luo
Developing a new environmentally friendly process for benzene nitration to nitrobenzene has been highly desirable for a long time. In this work, NO2 was used as a nitration agent to replace traditional nitric acid, and different mesoporous SiO2 and their supported heteropoly acid (salt) were employed to catalyze benzene nitration to nitrobenzene. Several typical catalysts were characterized using XRD, BET and FT-IR, and the acid amounts of the various catalysts were determined. The effects of various factors such as different catalysts, the molar ratio of benzene to NO2, reaction temperature, reaction time, HPW loading, the acid amounts of the catalyst and the reuse of the catalyst on the nitration reaction have also been systematically examined. The results indicate that the supported HPW/MCM-41 catalysts exhibit a remarkably synergistic catalytic performance on the nitration reaction of benzene to nitrobenzene. In particular, the 50%HPW/MCM-41 catalyst gives the best results with 73.4% benzene conversion and 98.8% selectivity to nitrobenzene under the optimal reaction conditions. Moreover, the mesoporous structure of MCM-41 was retained under the high loading of HPW. The possible reaction mechanism for the nitration reaction of benzene with NO2 over HPW/MCM-41 is suggested in the present work. This method provides a promising strategy for the preparation of nitro-aromatic compounds from a catalytic nitration reaction by using NO2 as the nitration reagent.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Mohan Huang,Kun Zhao,Shuangyan Liu,Ang Bian,Lu Jiang,Dawei He,Jiaqi He,Yongsheng Wang
The design and development of microwave-absorbing materials with excellent performance hold significant importance in both civil and military fields. The combination of magnetic loss materials and dielectric loss materials can achieve complementary performance effects and regulate impedance matching. In this paper, spindle-like α-Fe 2 O 3 was synthesized using MIL-88A as a template, which was then composited with Ti 3 C 2 T x phase possessing excellent electrical conductivity to obtain Fe 2 O 3 /Ti 3 C 2 T x composites. Ti 3 C 2 T x can provide good conductance loss and dipole polarization relaxation, while the incorporation of Fe 2 O 3 between the layers of Ti 3 C 2 T x not only triggers the interfacial polarization effect but also increases layer spacing, thereby enhancing multiple reflection effects. Furthermore, the magnetic-dielectric synergies further optimize the impedance matching. Through the combined action of multiple mechanisms, the Fe 2 O 3 /Ti 3 C 2 T x composites (with a mass ratio of 1:3 for Fe 2 O 3 and Ti 3 C 2 T x ) exhibit a minimum reflection loss of −34 dB and an effective absorption bandwidth of 1.53 GHz at a thickness of 3 mm, as well as an effective absorption bandwidth of 2.805 GHz at a thickness of 1.5 mm. This paper presents a reference strategy for constructing highly efficient microwave absorbers derived from Metal-organic frameworks (MOFs) and MXene based on their outstanding properties.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Coal Preparation and Utilization
·
2025
·
IF 2.1
Shengchao Yang,Sheng Dong,Jinpeng Qiao,Chao Kang,Yuqian Zhao,Yanze Wang,Jianrong Liu,Chenlong Duan,Sabereh Nazari,Miao Pan
Aiming at the problems of high quartz content, high ash content and difficult leaching of aluminum and gallium in some coal gangue, NaF-strengthened coal gangue calcination-hydrochloric acid leaching process was adopted, and the occurrence state of gallium in coal gangue was explored. The residue was analyzed by XRD and SEM, and the mechanism of NaF-strengthened coal gangue acid leaching was explored. The results show that the addition of m (NaF): m (coal gangue) = 0.06 can increase the leaching rate of aluminum in coal gangue from 33.72% to 62.03%, and the leaching rate of gallium from 43.17% to 70.15%. NaF as an additive can react with hydrochloric acid to form HF to destroy the coal gangue structure, so that hydrochloric acid can react with metakaolinite inside the quartz accumulation layer, which improves the leaching rate of aluminum and gallium. Finally, the process factors were studied separately to reveal the pattern in response to them, and it was found that the acid leaching reaction was greatly affected by internal diffusion, which provided a reference for the subsequent complexation adsorption of gallium.
研究领域:
冶金工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Junqin Liu,Pingxiao Wu,Shuaishuai Li,Meiqing Chen,Wentin Cai,Dinghui Zou,Nengwu Zhu,Zhi Dang
A high removal rate (>99.7%) of combined arsenite (As(III)) and Cd (Cd(II)) in low concentration (1000 μg/L) from contaminated water was achieved by a calcined MgZnFe-CO 3 layered double hydroxide (CMZF) adsorbent. Batch control studies and a series of spectroscopy detection technologies were employed to investigate the removal mechanism and interactions between As(III) and Cd(II) on the interface of water/CMZF. Synergistic adsorption and photooxidation occurred based on the systematical kinetic and isotherm studies. The enhanced removal of As(III) was achieved by the photooxidation, formation of ternary As(III) Cd(II) surface complexes and enhanced hydrogen bond . Meanwhile, oxidative formed negative charged As(V) could reduce the electrostatic repulsion force between Cd(II) cations and play a role as anion bridging, consequently resulted in a stronger attraction between CMZF and Cd(II). Combined with the verdicts of relevant characterizations such as XRD, XPS and EPR, it was assumed that the deep co-removal mechanism could be attributed to the coupling of various processes including intercalation, complexation, photooxidation of As(III) and precipitation of CdCO 3 . Moreover, the successful removal of As(III) and Cd(II) from real water matrix qualified the CMZF a potentially attractive adsorbent for both As(III) and Cd(II) deep treatment in practical engineering.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）