Catalysts
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2018
·Vol. 8
·期 1
·37
·
IF 3.465
Yang Zheng,Yangyang Guo,Lei Luo,Tingyu Zhu
The performance of activated carbon (AC) modified by different methods was compared for its catalytic degradation of ortho-chlorophenol (o-CP). For the chemically treated AC, the catalytic effect of AC–NH3·H2O was superior to the other catalysts examined, having ano-CP removal efficiency of 82.2% at 330 °C. For the metal-modified catalysts, AC–V and AC–Co showed similar removal performances of 93.2% at 330 °C. N2adsorption-desorption isotherms, Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and gas chromatography—mass spectrometry (GC-MS) analyses were used to characterize the reaction products, and different reaction mechanisms were proposed for both AC–NH3·H2O and AC–V according to the results. Complete oxidative degradation ofo-CP was achieved by AC–V, with AC–NH3·H2O leading to the formation of additional dioxins. It can be deduced that a risk of dioxin synthesis and escape during the regeneration process is possible when nitrogen-modified carbon is used in selective catalytic reduction (SCR) denitrification reactions, especially in the presence of chlorine atoms, benzene rings, and oxygen.Keywords:catalysis;modified carbon;ortho-chlorophenol;degradation mechanism
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2021
·
IF 4.158
Qi Zhang,Yuxin Song,Jiale Guo,Si Wu,Nuo Chen,Hougang Fan,Ming Gao,Jinghai Yang,Zifeng Sheng,Jihui Lang
The CC@TiO 2 -Cu membranes with various Cu doping contents have been synthesized via a simple one-step hydrothermal method for oil-water separation application. It is found that a certain amount of Cu doping is beneficial for achieving visible light response and enhance the superhydrophilicity/underwater superoleophobic performance of CC@TiO 2 -Cu membranes. Importantly, the CC@TiO 2 -Cu2.5 membrane with cauliflower-like morphology shows excellent self-cleaning and antifouling performance under visible light driven. And its separation efficiency can still maintain up to 99.6% under gravity even after 80 cycles of oil-water separation experiments. The mechanisms of both oil-water separation and photocatalytic self-cleaning for the CC@TiO 2 -Cu membrane are discussed in detail. The study provides a new concept for designing self-cleaning membrane to apply in oil-water separation.
研究领域:
材料科学
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环境工程
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Jiangnan Huang,Shuang Chen,Yingjie Ruan,Hao-Fan Wang,Hongjuan Wang,Hao Yu,Yonghai Cao
The efficient uptake of U(VI) ions from the real seawater as the nuclear energy source was of paramount importance. Here, the three-dimensional (3D) flexible carbon felts (FCFs) with N dopants and oxygen-containing groups (o-NFCF) were prepared via the solvothermal method. The obtained FCFs were used as the adsorbents for the uptake and enrich of U(VI) by a flow-through electro-sorption operation in the laboratory-designed device. The pristine FCF (pFCF) displayed a 5.0 mg/g capacity under the initial conditions of 10 mg/L U(VI), which was improved with the presence of an electric field (7.2 mg/g, 0.6 V). The o-NFCFs with 2.58 at.% N dopant and 11.09 at.% oxygen functionalities on the surface would lead to the enhanced performance (11.8 mg/g). This was facilitated by the aid of an electric field (18.8 mg/g, 0.6 V) with a Q max of 44.6 mg/g as well. The decreased activity was observed in the simulated seawater (16.4 mg/g) and real seawater (10.6 mg/g), respectively, probably ascribed to the coexistence of organisms and complex ions. The uptake stability of U(VI) from the real seawater was then observed, ascribed to the desorption capability of U(VI) from the surface of o-NFCF. In this process, o-NFCF could be in-situ regenerated simultaneously. By doing so, the enrichment of U(VI) to 5.85 mg/L concentration from a real seawater was obtained. Mechanistic studies and DFT simulations indicated that the electrochemical properties of 3D-NFCF materials dominated the electro adsorption of U(VI).
研究领域:
环境科学
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材料科学
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核化学
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电化学
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海洋资源利用
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DOI
高影响因子
CHEMOSPHERE
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2020
·
IF 5.778
Haijie Li,Hao Qi,Mingyuan Yin,Yujie Chen,Qiliang Deng,Shuo Wang
Paraquat (PQ) pollution has become an increasing seriously threat to the ecological environment. Thus, it is vital to study novel adsorption materials capable of removing PQ. Modified carbon tubes (MCT-600) were prepared by carbonizing the seed hair fibers of Metaplexis japonica at 600 °C and further modifying with nitric acid . The MCT-600 was found to possess a regular morphology, a good graphitization degree and an abundance of carboxyl functional groups. Moreover, this materil exhibits excellent adsorption performance for paraquat (PQ), such as a fast adsorption rate (adsorption equilibrium within 20 min), large adsorption capacity (218.61 mg g −1 ) and good regeneration ability (reused more than 5 times). The adsorption process for PQ onto MCT-600 was found to be well matched to a Langmuir isotherm and pseudo-second-order kinetics model. Owing to its unique surface properties, green raw material source and simple preparation process, MCT-600 shows potential as an outstanding candidate for PQ removal from water.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
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2025
·
IF 7.7
Aijuan Zhou,Liangxia Zhu,Yuting Chen,Jingwen Wang,Yong Liu
Carbon materials (CMs) have emerged as cost-effective adsorbents with significant potential for environmental remediation, yet their limited adsorption performance for ammonia nitrogen (NH 4 + -N) restricts their application in water purification. Herein, persulfate (PS)-modified carbon nanotubes (MCNTs) were synthesized to enhance NH 4 + -N adsorption from aqueous solutions. The MCNTs showed a well-developed mesoporous structure, higher graphitization degree, and more carbonyl (C=O) groups than pristine carbon nanotubes (CNTs). These structural modifications resulted in a remarkable adsorption performance, achieving both rapid adsorption equilibrium (≤3 min) and a 2- to 3-fold increase in adsorption capacity (compared to pristine CNTs). The adsorption rate constant of MCNTs was 2.58 mg/(g∗min) and the maximum adsorption capacity reached 15.49 mg/g. Mechanistic studies revealed that the enhanced mesoporous ratio of MCNTs significantly accelerated adsorption kinetics, whereas high graphitization degree and elevated C=O content contributed to their superior adsorption capacity and rate. Additionally, saturated MCNTs were effectively regenerated using a sodium hydroxide solution and maintained stable adsorption performance after 5-cycles. This modification strategy demonstrated excellent universal applicability across various CMs. To demonstrate practical applicability, the modified CMs (MCMs) were loaded on an ultrafiltration membrane and employed in a continuous flow adsorption system for treating aquaculture wastewater. The system reduced the NH 4 + -N concentration in the effluent to below 0.3 mg/L within 80 min. This work not only provides a novel class of high-performance MCMs for NH 4 + -N removal from wastewater but also elucidates the critical role of CMs' structure properties in governing adsorption performance.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Yong Liu,Ziqiang Tong,Huiming Zhu,Xiaoying Zhao,Jiayan Du,Baoquan Zhang
Novel polyamide (PA) composite membranes were prepared by conducting interfacial polymerization on the modified carbon nanotube (mCNT)-deposited polyacrylonitrile (PAN) ultrafiltration membranes. Based on the characterization using TEM, SEM, FT-IR, and contact angle measurements, more even mCNT stacking could be realized on hydrolyzed PAN (hPAN) substrate. The uniformly stacked mCNT scaffold on hPAN is conducive to the formation of the PA composite membrane with a dense and crumpled texture. The prepared PA composite membrane exhibited dense crumpled texture with high hydrophilicity. The influences of surface morphology , feed temperature, and salt concentration and composition on desalination performances for PA composite membranes were investigated, followed by stability evaluation. Subjected to pervaporation desalination, the water flux attained to an ultrahigh value (104 kg m −2 h −1 ) with ideal rejection performance (99.99%) using 3.5 wt% NaCl aqueous solution as the feed at 70 °C. Moreover, the prepared PA composite membrane was also competent in hypersaline water desalination and acid brine water treatment. All the results demonstrated that the prepared PA composite membrane with crumpled texture had a great application potential in seawater desalination.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Nano Energy
·
2023
·
IF 17.6
Jiurong Li,Jiancang Chen,Xiujian Zhao,Alberto Vomiero,Xiao Gong
Carbon dots (CDs) generally suffer from aggregation-induced fluorescence quenching effect in solid-state, which significantly limits their application in photoelectric devices. Due to this effect, it is a great challenge to achieve high-transparency and high-performance luminescent solar concentrators (LSCs) based on CDs. Here, the synthesis of organosilane-grafted carbon dots (Si-CDs) is rationally designed by hydrothermal method using anhydrous citric acid, ethanolamine and KH-792 as the reaction precursors. The obtained Si-CDs can be uniformly dispersed in the polyvinyl alcohol (PVA) matrix through the dehydration condensation reaction and hydrogen bonding between the silicon hydroxyl group of Si-CDs and the hydroxyl group of PVA. Based on this property, Si-CDs/PVA thin-film LSCs (5 × 5 × 0.2 cm 3 ) with ultrahigh CD loading (25 wt%) and high transparency can be fabricated, exhibiting excellent absorption in the UV spectral region and about 90 % transmission in the visible range. Furthermore, the power conversion efficiency (PCE) of the LSCs can reach 2.09 % under a standard solar light and shows excellent stability even over 12 weeks. This synthetic design is expected to be beneficial for future development of CD synthesis and paves the way for the development of CDs-based photoelectric devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Shengzhen Li,Shushu Chu,Mingyuan Xia,Hengya Wei,Yizhong Lu
The peroxidase mimics usually requires the addition of exogenous hydrogen peroxide (H 2 O 2 ), which greatly hinder their practical applications. Herein, through rational co-modification of multiple elements (potassium (K), chlorine (Cl) and iodine (I)), the modified carbon nitride nanomaterials (KCl/KI-CN) could serve as efficient bifunctional catalysts. The multiple elements doping and the incorporation of cyano groups ( C N) are deemed to enhance their photocatalytic and peroxidase-like activity, respectively. Based on the photocatalytic function, H 2 O 2 can be produced continuously and steadily via two-electron oxygen reduction over modified carbon nitride under visible light irradiation. Subsequently, the KCl/KI-CN could catalyze the chromogenic substrate by the in-situ produced H 2 O 2 . Taking advantage of the bifunctional properties of modified carbon nitride, we for the first time demonstrate a self-cascade catalytic process and apply successfully for the ascorbic acid (AA) detection and versatile total antioxidant capacity (TAC) evaluation. This paper not only prepares an efficiently bifunctional catalyst but also provides a new self-cascade photocatalytic H 2 O 2 production strategy for the peroxidase-like application.
研究领域:
催化
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材料科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
VACUUM
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2018
·
IF 2.067
Abdeldjalil Zegaoui,Mehdi Derradji,Ruikun Ma,Wan-an Cai,Aboubakr Medjahed,Wen-ben Liu,Abdul Qadeer Dayo,Jun Wang
In this paper, various concentrations of silane treated carbon fibers (TCFs) were incorporated within cyanate ester/benzoxazine resin to demonstrate their effects on the morphological, mechanical, thermal decomposition properties of the composites. Mechanical test inferred the distinctive improvements in the values of the flexural strength and modulus. The glass transition temperature ( T g ) determined from the DSC measurements were appreciably higher than those of the unfilled blend. TGA results showed an improved in the thermal stability in terms of the T 5% , T 10% , Y c , T HRI and LOI for all composites. For instance, the T 5% , T 10% , Y c , T HRI and LOI were respectively 345.1 °C, 391.8 °C, 50.1%, 217.1 °C and 37.5% for the composites with 20 wt% of the TCFs. The thermal degradation was assessed by evaluating the variation of the activation energy ( E ac ) of the composites by using three kinetic models, namely Horowitz and Metzger, Coat and Redfern, and Broido models. It was found that the E ac greatly increased and further reflected the improvement in the thermal stability of the composites. This could be attributed the unique characteristics of the TCFs that possibly resulted in effective physical barrier effects against thermal degradation, thereby leading to the amelioration of the thermal properties .
研究领域:
材料科学
·
复合材料工程
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产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 12
·2205835
·
IF 13.3
Shanshan Sun,Minglin Zhao,Qingwei Wang,Shujie Xue,Qinghong Huang,Nengfei Yu,Yuping Wu
It is vital to create flexible batteries as power sources to suit the needs of flexible electronic devices because they are widely employed in wearable and portable electronics. The direct methanol fuel cell (DMFC) is a desirable alternative portable energy source since it is a clean, safe, and high energy density cell. The traditional DMFC in mechanical assembly and its unbending property, however, prevent it from being employed in flexible electrical devices. In this study, the flexible membrane electrode assembly (MEA) with superior electrical conductivity and nanoscale TiC-modified carbon cloth (TiC/CC) is used as supporting layer. Additionally, solid methanol fuels used in the manufacturing of flexible all-solid-state DMFC have the advantages of being tiny, light, and having high energy density. Furthermore, the DMFC's placement and bending angle have little effect on its performance, suggesting that DMFC is appropriate for flexible portable energy. The flexible all-solid-state DMFC's power density can reach 14.06 mW cm −2 , and after 50 bends at 60°, its voltage loss can be disregarded. The flexible all-solid DMFC has an energy density that is 777.78 Wh Kg −1 higher than flexible lithium-ion batteries, which is advantageous for the commercialization of flexible electronic products.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Lihao Liang,Siwei Meng,Jiaping Tao,Jiaming Li,Xingkun Wang,Jian Guan,Hongtao Fu,Caili Dai,He Liu
Conventional flooding systems have very low recovery rates in ultralow permeability reservoirs in virtue of the characteristics of high injection pressure, low permeability and small pores in such reservoirs. In this study, a novel surface-modified carbon black (MCB) nanofluid was prepared as a flooding system to resolve this problem. The preparation process of MCB nanoparticles was divided into three stages: (1) oxidation of carbon black (CB) nanoparticles, (2) acyl chlorination of oxidized carbon black (OCB) nanoparticles and (3) grafting of active groups onto the surface of acyl chloride carbon black (ACB) nanoparticles, and the main synthesis conditions, such as modifier concentration and grafting temperature, were optimized. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analysis indicated that the factional groups were successfully introduced onto the surface of CB nanoparticles, and the crystallinity of CB nanoparticles decreased gradually during the reaction process. Additionally, the dispersed stability, temperature resistance, salinity tolerance, wettability alteration and oil stripping ability were evaluated so as to obtain the performance of the MCB nanofluid. The results show that the average size of the MCB nanoparticles is approximately 72.3 nm, and the dispersed stability of the MCB nanofluid is much better than that of the CB nanofluid. Compared with the carbon black (CB) nanofluid, the MCB nanofluid shows stronger wettability alteration and oil stripping ability, and can also withstand the high temperature and high salt environment of oil reservoirs. 1 PV of MCB nanofluid can enhance oil recovery by 28.9%. Furthermore, the enhanced oil recovery (EOR) mechanisms for the MCB nanofluid are revealed through analysis of low oil–water IFT (IFT), wettability alteration and Wasan’s theory of structural disjoining pressure. This new type of environment-friendly flooding system injects vitality into the development of ultralow permeability reservoirs.
研究领域:
石油工程
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材料科学
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化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hengrui Wang,Kexin Chen,Yongqian Shi,Yanjun Zhu,Songqiong Jiang,Yan Liu,Shijie Wu,Chenxin Nie,Libi Fu,Yuezhan Feng,Pingan Song
The demand for high-strength, flexible, and multifunctional electromagnetic interference (EMI) shielding materials has significantly increased in many fields. Herein, inspired by reinforced concrete pouring in construction, we propose a “consolidating” method to successfully fabricate flame-retardant thermoplastic polyurethane (TPU) reinforced bacterial cellulose (BC)/MXene/modified silicon carbide nanowires (MSiCnw) aerogel composites. The obtained aerogel composites have a disordered pore structure, in which BC/MXene/MSiCnw is used as the internal skeleton, and the tightly attached flame retardant TPU sheet is used as the protective layer. The as-synthesized aerogel composites possess excellent mechanical properties, withstanding repeated compression and exhibiting a compressive strength of 8.86 kPa which is 735.8% higher than that of BC aerogel. At a low MXene content (6.17 wt%), the aerogel composite exhibits an EMI utilization efficiency of 1209.08 dB/g g −1 and an average EMI shielding effectiveness of up to 81.6 dB (K-band). Furthermore, the aerogel composites show excellent flame retardant property (69.8% reduction in peak of heat release rate). More interestingly, the aerogel composite displays satisfactory thermal insulation performances and reaches a low thermal conductivity of 34.4 mW/m K −1 . Overall, the as-prepared highly fire safe BC/MXene/MSiCnw/FRTPU aerogel composites show multifunctional properties, making them suitable for applications in electromagnetic shielding and thermal insulation.
研究领域:
材料科学
·
纳米技术
·
复合材料工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）