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
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
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
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
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 3
·1-12
·
IF 6.048
Gao Yuchen,Jiang Jianguo,Meng Yuan,Ju Tongyao,Han Siyu
Biogas is a renewable biomass energy source mainly composed of CH 4 and CO 2 . Dry reforming is a promising technology for the high-value utilization of biogas. Some impurity gases in biogas can not be completely removed after pretreatment, which may affect the performance of dry reforming. In this study, the influence of typical impurities H 2 S and NH 3 on dry reforming was studied using Ni/MgO catalyst. The results showed that low concentration of H 2 S in biogas could cause serious deactivation of catalyst. Characterization results including EDS, XPS and TOF-SIMS confirmed the adsorption of sulfur on the catalyst surface, which was the cause of catalyst poisoning. We used air calcination method to regenerate the sulfur-poisoned catalysts and found that the regeneration temperature higher than 500 °C could help catalyst recover the original activity. NH 3 in the concentration range of 50–10000 ppm showed a slight inhibitory effect on biogas dry reforming. The decline rate of biogas conversion efficiency increased with the increase of NH 3 concentration. This was related to the reduction of oxygen activity on catalyst surface caused by NH 3 . The synergetic effect of H 2 S and NH 3 in biogas was investigated. The results showed that biogas conversion decreased faster under the coexistence of H 2 S and NH 3 than under the effect of H 2 S alone, so as the surface oxygen activity of catalyst. Air calcination regeneration could also recover the activity of the deactivated catalyst under the synergetic effect of H 2 S and NH 3 .
研究领域:
能源化学
·
催化化学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Deqing Zhang,Yingfei Xiong,Junye Cheng,Hassan Raza,Chuanxu Hou,Tingting Liu,Xuewei Ba,Ping Zhang,Maosheng Cao
As a novel 2D transition metal sulfide material, WS 2 has been proven to possess potential electromagnetic wave absorption (EMWA) property due to its peculiar electronic structure. However, the intrinsic weak impedance match and single dielectric loss domination of this material only produce high-frequency electromagnetic absorption (EMA), which is seemingly futile for the prevalent low-band 4G and 5G EMW. In this study, efforts have been made to effectively texture rod-like TiO 2 semiconductor with different mass ratios on the a few layers of WS 2 nanosheets via a simple step-by-step hydrothermal method. It is found that the WS 2 /TiO 2 hybrids loaded with 10% TiO 2 at a sample thickness of 5.30 mm, the minimum RL is −43.90 dB at 5.12 GHz. When the thickness of the sample is 2.00 mm, the bandwidth with RL value less than −10 dB can reach 4.70 GHz, and the effective EMA band could be adjusted in a range of 13.84 GHz (4.16–18 GHz) by increasing the thickness from 1.0 mm to 5.5 mm. It was found that the introduction of TiO 2 nanosheets with high dielectric loss into the dielectric WS 2 nanosheets can produce a synergistic effect. The benefits of such synergestic effect include, optimization of the EMA strength and bandwidth, and a reduction of the effective EMA frequency band from high frequency to low frequency. This study paves a new avenue for the future design of low-frequency EMA materials with high efficiency.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2017
·Vol. 14
·期 12
·1564
·
IF 2.101
Wenchao Liao,Virender K. Sharma,Su Xu,Qingsong Li,Lei Wang
Degradation of norfloxacin (NOR) was studied using a combination of microwave and UV irradiation methods (MW/UV process). Remarkable synergistic effect was found between MW and UV light. The removal rate with the MW/UV process was much faster than that with UV light irradiation only. Degradation of NOR followed second-order kinetics and ~72% of NOR could be removed in the first 5 min of MW/UV reaction. Influence of inorganic ions (cations (K+, Mg2+, Ca2+, Cu2+) and anions (Cl−, SO42−, NO3−, CO32−)), humic acid (HA) and surfactants (cation, anion, and non-ionic) on the degradation of NOR by the MW/UV process was investigated. Among the ions, Cu2+and NO3−ions inhibited the degradation of NOR. The presence of HA and surfactants in water showed a slight inhibition on the NOR removal. Furthermore, the NOR degradation in the MW/UV process was primarily caused by the ·OH-photosensitization steps. Seven intermediates formed by the oxidation of NOR were identified and three reaction pathways were proposed. Removals of NOR in tap water (TW), synthetic wastewater (WW), river water (RW), and seawater (SW) were also studied, which demonstrated that the MW/UV process was an effective oxidation technology for degrading fluoroquinolone antibiotics in different water matrices.Keywords:antibiotics;photolysis;oxidation;microwave;synergistic effect
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Fire-Switzerland
·
2023
·Vol. 6
·期 1
·14
·
IF 3.2
Jiaxiang Gao,Hanguang Wu,Yang Xiao,Wenjing Ma,Fei Xu,Rui Wang,Zhiguo Zhu
It remains a challenge to prepare flame-retardant composites via the addition of a low content of flame retardant. In this work, a novel DOPO-functionalized reduced graphene oxide hybrid (DOPO-M-rGO) flame-retardant system was synthesized for epoxy resin (EP). The phosphorus-nitrogen-reduced graphene oxide ternary synergistic effect provided DOPO-M-rGO with high flame-resistance efficiency in EP; thus, the EP-based composite exhibited superior fire-resistant performance at extremely low DOPO-M-rGO loading. The limiting oxygen index (LOI) of the EP-based composite was increased from 25% to 32% with only 1.5 wt% DOPO-M-rGO addition, and the peak heat release rate (pHRR), total heat release (THR), and total smoke production (TSP) were significantly decreased by 55%, 30%, and 20%, respectively. In addition, as a halogen-free flame-retardant system, DOPO-M-rGO presents great application potential as an eco-friendly additive for the flame-resistance improvement of thermosetting polymer materials.Keywords:flame retardant;epoxy resin;synergistic effect;high efficiency
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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiuling Chen,Tian Gao,Ying Ren,Changjiang Xiao
The demand for high-performance electromagnetic wave absorbent materials continues to grow with advancing technology. This study reports the synthesis of Bi 2 Fe 4 O 9 /Fe 3 O 4 nanoflower to enhance electromagnetic wave absorption. Bi 2 Fe 4 O 9 , synthesized via a hydrothermal method, was composited with different content Fe 3 O 4 nanocrystals. The strong binding between sheets of nanoflowers provides large surface area and active sites for electromagnetic wave absorption (EMA). The combination of Bi 2 Fe 4 O 9 and Fe 3 O 4 markedly enhanced the dielectric and magnetic properties, resulting in exceptional EMA performance. The sample achieved a minimum reflection loss (RL min ) of −75 dB at 7.0 GHz with a thickness of just 2.5 mm, along with a maximum effective absorption bandwidth (EABW) of 9.2 GHz. The broadband and strong absorption on electromagnetic wave is attributed to the synergistic effects of ferroelectric properties from Bi 2 Fe 4 O 9 and spinel structure of Fe 3 O 4 , supported by strong dipole coupling, interfacial polarization, and high-spin states of Fe ions. The underlying mechanism is thoroughly discussed, and the results demonstrate superior performance compared to similar studies in the field.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 9
·1924
·
IF 4.2
Shen Song,Yufei Tang,Rui Feng,Xiaohan Zhang,Yue An,Weibao Kong,Junlong Wang,Ji Zhang,Junyu Liang
Investigations have shown that storage bugs seriously harm grains during storage. In the interim, essential oils (EOs) have been proven to be a good botanical pesticide. The anti-Lasioderma serricorneproperties ofElsholtzia ciliataessential oil, which was obtained by steam distillation, were evaluated usingDL-limonene, carvone, and their two optical isomer components using contact, repelling, and fumigation techniques. Simultaneously, the fumigation, contact, and repellent activities of carvone and its two optical isomers mixed withDL-limonene againstL. serruricornewere evaluated. The results showed thatE. ciliata,its main components (R-carvone,DL-limonene), andS-carvone exhibited both fumigations (LC50= 14.47, 4.42, 20.9 and 3.78 mg/L) and contact (LD50= 7.31, 4.03, 28.62 and 5.63 µg/adult) activity againstL.serricorne.A binary mixture (1:1) ofR-carvone andDL-limonene displayed an obvious synergistic effect. A binary mixture (1:1) of carvone and its two optical isomers exhibited an obvious synergistic effect, too. Furthermore, the repellent activity of the EO, carvone, and its two optical isomers,DL-limonene, and a combination of them varied. To stop insect damage during storage,E. ciliataand its components can be utilized as bio-insecticides.
研究领域:
植物学
·
昆虫学
·
农业科学
✓ 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）