SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jieli Peng,Yongxing Zheng,Zhenxing Wang,Zhe Dai,Ziqi Guo
In this study, an innovative method was proposed to treat ilmenite by using sodium persulfate (Na 2 S 2 O 8 ) as a surface activator to enhance the flotation of ilmenite. The action mechanism of Na 2 S 2 O 8 on the ilmenite surface was investigated by micro-flotation, adsorption tests, powder contact angle, zeta potential detection, Fourier transform infrared spectroscopy (FT-IR) analysis and X-ray photoelectron spectroscopy (XPS) analysis. Micro-flotation experiments showed that recovery of the ilmenite was effectively enhanced in the pH range of 4.0 ∼ 10.0 by adding Na 2 S 2 O 8 . The adsorption tests illustrated that the introduction of Na 2 S 2 O 8 effectively enhanced the adsorption of NaOL on the surface of ilmenite. The powder contact angle tests presented that the contact angle of samples increased after treatment with Na 2 S 2 O 8 and NaOL. The zeta potential testing results showed that surface potential of the ilmenite treated with Na 2 S 2 O 8 and NaOL was negatively migrated in the pH ranging from 3.5 to 10.0, revealing that the mineral surface adsorbed more oleic acid anions. FT-IR analyses suggested that the chemical adsorption of oleic acid on the surface of ilmenite was enhanced after treating with Na 2 S 2 O 8 . XPS analyses revealed that the addition of Na 2 S 2 O 8 induced a transformation of Fe (+Ⅱ) into Fe (+Ⅲ) and enhanced adsorption of NaOL on the ilmenite surface. A reaction model of Na 2 S 2 O 8 interacting with the surface of ilmenite was proposed to interpret the activation mechanisms.
研究领域:
矿物加工工程
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化学工程
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材料科学
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产品关联
DOI
高影响因子
NUCLEAR TECHNOLOGY
·
2024
·
IF 1.5
Jianwei Zhang,Tuo Li,Bo Tian,Jinfeng Li,Wenze Li,Abdullah,Nan Zhang,Hongtao Zhao
Adsorption is widely regarded as the most promising method for uranium extraction. Among the various materials that have been studied, graphene oxide (GO) has attracted intensive interest because of its large specific surface area and abundant oxygen-containing functional groups. However, the layers tend to aggregate owing to pronounced Van der Waals forces, which reduce the surface area and diminish the likelihood of contact between uranyl ions and adsorption sites. Graphite oxide is an intermediate product of GO, with a simple preparation process and low cost. In this study, graphite oxide nanosheets (GONs) were synthesized using graphite oxide powder as the raw material and the NaOH activation method. GONs possessed a larger specific surface area and more carboxyl groups, which resulted in an excellent uranium adsorption capacity. The maximum adsorption capacity was found to be 578.0 mg·g−1, and the adsorption rate was 90.8% within 30 min. The adsorption process closely resembled the pseudo-second-order model and the Langmuir model. The mechanism of uranium adsorption by GONs was the synergistic coordination of -COOH and -OH with U(VI). This research suggests that the novel uranium adsorbent GONs can be applied to efficiently capture U(VI) from radioactive wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Defence Technology
·
2021
·
IF 3.172
Jian Wang,Jun Wang,Yaofeng Mao,Rufang Peng,Fude Nie
Boron is a very promising and highly attractive fuel because of high calorific value. However, the practical applications in explosives and propellants of boron have been limited by long ignition delay time and low combustion efficiency. Herein, nano-Al and graphene fluoride (GF) as surface activated materials are employed to coat boron (B) particles to improve ignition and combustion performance. The reaction heat of nano-Al coated B/KNO 3 and GF coated B/KNO 3 are 1116.83 J/g and 862.69 J/g, respectively, which are higher than that of pure B/KNO 3 (823.39 J/g). The ignition delay time of B/KNO 3 could be reduced through nano-Al coating. The shortest ignition delay time is only 75 ms for B coated with nano-Al of 8 wt%, which is much shorter than that of pure B/KNO 3 (109 ms). However, the ignition delay time of B/KNO 3 coated with GF has been increased from 109 to 187 ms. B coated with GF and nano-Al shown significantly influence on the pressure output and flame structure of B/KNO 3 . Furthermore, the effects of B/O ratios on the pressure output and ignition delay time have been further fully studied. For B/KNO 3 coated with nano-Al and GF, the highest pressures are 88 KPa and 59 KPa for B/O ratio of 4:6, and the minimum ignition delay time are 94 ms and 148 ms for B/O ratio of 7:3. Based on the above results, the reaction process of boron coated with GF and nano-Al has been proposed to understand combustion mechanism.
研究领域:
材料科学
·
燃烧与推进
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Yalin Yang,Zheyan Chen,Hanlin Huang,Yuxin Liu,Junhua Zou,Shuqi Shen,Jiawei Yan,Jinshui Zhang,Zanyong Zhuang,Zhongzhen Luo,Chengkai Yang,Yan Yu,Zhigang Zou
Halide perovskites and derivatives have been used as emerging photocatalysts due to their unique optoelectronic and structural diversity. However, compared with the well-explored photophysical processes for light-driven more energetic carriers to trigger redox reactions, catalytic effects on the surface of halide perovskite or their derivatives for chemical transformations between reactive species are seldom addressed, which is equally important for improving the efficiency for halide perovskite-based photocatalysts. Here, we demonstrate that Cs 3 Bi 2 Br 9 sites in the Cs 3 Bi 2 Br 9 /CdS heterojunction, not only participate in light-driven processes, but also play a vital role for the activation and conversion of key intermediates during C(sp 3 )-H bond transformation, via a more thermodynamically and kinetically favorable surface reaction pathway. Besides, various aromatic hydrocarbons can be effectively photocatalytic converted to corresponding aldehydes/ketones as major products. This work highlights the importance of surface catalysis mechanism in photocatalysis not only for halide perovskites but also for other semiconductors.
研究领域:
材料科学
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化学工程
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光化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 5
·期 8
·1701626
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IF 4.834
Xueyan Sun,Ying Yan,Lijing Zhang,Guangxin Ma,Yang Liu,Yongxian Yu,Qi An,Shengyang Tao
Mass transfer plays a key role in the diffusion-controlled heterogeneous reactions. Varied efforts have been made to design the structure of catalysts and reactors to optimize the diffusion process. Herein, a facile strategy is reported to construct highly reactive agitating impeller (denoted as AI) by employing 3D printing and a facile surface activation treatment. On the one hand, experimental results and numerical simulation analysis reveal that the 3D printing AI with appropriate structure can not only effectively eliminate external diffusion but also conveniently be separated from heterogeneous reaction systems. On the other hand, surface activation helps to significantly promote the chemical reactivity of AI for Fenton and galvanic replacement reaction, which are used to treat organic and inorganic pollutants in water, respectively. Benefiting from these cooperative merits, the integrated catalytic AI delivers a catalytic performance toward Fenton reactions as high as a homogeneous catalyst, and the removal rate for heavy metal ions is nearly 100% through galvanic replacement. This 3D printing with surface engineering strategy should also be extended to other applications, and provide new field for preparing efficient and durable heterogeneous catalysts in a more economical way.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 48
·17403-17409
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IF 7.059
Cuifang Meng,Dandan Yang,Ye Wu,Xuejia Zhang,Haibo Zeng,Xiaoming Li
Encapsulating cesium lead halide (CsPbX3, X = Cl, Br, and I) perovskite quantum dots (PQDs) into stable shells has been proved to be an effective strategy for improving their stability, which however usually forms agglomerated particles or alters PQDs’ original morphology and optical properties. Herein, we propose a surface activation strategy to prepare single CsPbBr3@SiO2 core–shell particles. (3-Aminopropyl)triethoxysilane (APTES) is used as a bifunctional surface ligand, which not only effectively passivates the surface defects of PQDs, but also provides –SiOCH3 and –SiOH groups for the formation of Si–O–Si covalent bonds with the subsequently introduced silanes. Furthermore, by controlling the hydrolysis rate of silanes, we realized the preparation of single CsPbBr3@SiO2 core–shell particles with an average shell thickness from 1 to 2.7 nm, and the PQDs maintained their initial cubic morphology and optical properties after coating. The stability of CsPbBr3@SiO2 in harsh environments has been effectively improved owing to the complete encapsulation of the SiO2 shell. As a result, the emission peak of CsPbBr3@SiO2 remains constant at 515 nm after being heated at 60 °C for 84 h, and the photoluminescence (PL) intensity still remains 90% after storage for 6 h in a high humidity environment. This work not only enhances the stability of PQDs for practical applications but also provides a reliable method to synthesize single core–shell particles, which can be instructive to other PQD systems.
研究领域:
材料科学
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纳米技术
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化学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
Hongjie Xu,Yi Yao,Yuelin Jin,Jiayu Zhan,Zheng Zhao,Shengli Qi,Guofeng Tian,Dezhen Wu
With the development of high-performance organic fiber reinforced composites, challenges related to fiber microstructural defects and surface inertness have attracted increasing attention. To address these issues, this study proposes effective and commercially viable strategies for restoring sub-microstructures and activating fiber surfaces. Through the synergistic effect of acetone and epoxy, the epoxy not only adsorbed onto and activated the fiber surface but also deeply penetrated into the fibers, thereby restoring the fibril-void structure. The multifunctional epoxy significantly improved the structural and interfacial strength, leading to significant improvements in the tensile and compressive strength of the monofilament, with increases of 15 % and 59 %, respectively. Upon preparation into a composite, the interfacial shear and compressive strength were enhanced by 75 % and 53 %, respectively. Furthermore, molecular dynamics simulations revealed that the interfacial enhancement mechanism is closely associated with the increased interfacial energy and thickness, as well as the enhanced reactivity of the epoxy.
研究领域:
材料科学
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复合材料
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界面化学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Xin Jin,Denghui Ren,Haisheng Wu,Hao Kong,Qingzhao Yang,Tao Zhou,Zhenxia Zhao,Jing Li
Waste tire management remains an environmental challenge due to low recycling rates and the inert nature of rubber powder (RP) in asphalt applications. This study systematically investigates the surface activation of RP using five acids—gallic acid, oleic acid, palmitic acid, stearic acid, and tannic acid—and evaluates their effects on asphalt modification. Among these, gallic acid-activated rubber powder (GA-RP) exhibited the most significant enhancements in rheological properties and anti-aging performance. Compared to unmodified asphalt, GA-RP-modified asphalt demonstrated a 126.76 % increase in complex modulus, a 173.12 % increase in storage modulus, and a 107.18 % increase in loss modulus at 46°C, reflecting improved elasticity and high-temperature stability. The MSCR test revealed an 82.98 % reduction in strain under 0.1 kPa stress, indicating superior resistance to permanent deformation, while the LAS test demonstrated a 7.52-fold increase in fatigue life at 2.5 % strain, confirming enhanced durability. Molecular dynamics simulations provided further insights into the improved compatibility of GA-RP with the asphalt matrix. The solubility parameter difference between GA-RP and asphalt was reduced to 1.69, the smallest among all modified asphalts, suggesting superior molecular affinity. Mean square displacement analysis showed that the diffusion coefficient difference between GA-RP and asphalt was only 0.00038 Ų/s, significantly lower than that of unmodified RP (0.00086 Ų/s), confirming enhanced stability and reduced phase separation. Additionally, GA-RP-modified asphalt exhibited the lowest softening point difference (2.1°C) in storage stability tests, further validating the effectiveness of gallic acid modification. These findings establish an optimized strategy for sustainable waste tire utilization, offering an effective and environmentally friendly solution for high-performance asphalt modification.
研究领域:
材料科学
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环境科学
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土木工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wei Miao,Ying Liu,Dandan Wang,Ningjie Du,Ziwei Ye,Yang Hou,Shun Mao,Kostya (Ken) Ostrikov
Transition-metal and nitrogen co-doped carbon-based catalysts receive much attention in peroxymonosulfate (PMS) activation. However, the contribution of doped metal and the kinetic mechanisms of the emerging nonradical pathways especially enabled by reactive singlet oxygen species remain unclear. Herein, we report Fe-N-co-doped carbon-based catalysts (FeCNx) for peroxymonosulfate activation. The catalysts achieve fast removal of a broad spectrum of organic pollutants in a wide pH range without the common Fe leaching. Both catalyst surface-activated PMS complex (catalyst-PMS*), surface-bound radicals, and singlet oxygen are identified. The new mechanism is enabled by the Fe-Nx single-atomic-site that enhances the adsorption of PMS and facilitates the formation of catalyst-PMS*. The formation route of singlet oxygen species is elucidated for the first time for Fe, N-co-doped carbon-based catalysts with density functional theory simulation. This study reveals the intrinsic role of Fe-Nx site in catalysts and provides new insights into the origin and kinetics of non-radical pathways for peroxymonosulfate activation.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Energy
·
2017
·
IF 0
Guoqing Tong,Xinzheng Lan,Zihang Song,Guopeng Li,Huan Li,Linwei Yu,Jun Xu,Yang Jiang,Yun Sheng,Yi Shi,Kunji Chen
An improved vapor-phase deposition that leveraged the use of surface activation of PbI 2 film has been developed for modifying perovskite crystallization process . This was achieved by loading Cl − ligands on closely-packed PbI 2 particle film—a scaffold that allowed in situ formation of perovskite active layer . The introducing of Cl − ligands served the Cl-capped and thus electrostatically-charged PbI 2 nanoparticles showed improved colloidal stability in DMF , which facilitated the preparation of PbI 2 film. More importantly, during the process of CH 3 NH 3 I (MAI) deposition i.e. the growth of perovskite materials, the presence of three-dimensional Cl − ligand matrix favored the formation of dense perovskite film. Moreover, a desired release of chloride was also achieved, thus promote the rearrangement of the perovskite during the volume expansion process. This finally led to a PCE of PSCs exceeding 16.42% under AM 1.5 irradiation. Therefore, surface-activation with Cl-ligand matrix could provide guidelines for the morphology optimization and the perovskite devices performance enhancement.
研究领域:
材料科学
·
纳米科技
·
物理化学
·
能源材料
·
半导体器件
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薄膜技术
·
光电转换
✓ 已验证
DOI
Applied Physics Reviews
·
2023
·Vol. 10
·期 2
·
IF 15
Liu Qingtao,Liu Jieyuan,Liu Xiaofang,Wang Yu,Hong Song,Wu Jianbo,Shang Jiaxiang,Yu Ronghai,Miao Jungang,Shui Jianglan
To develop efficient and durable acidic oxygen–reduction–reaction (ORR) catalysts based on all platinum group metals (PGMs) is crucial for large-scale application of proton-exchange membrane fuel cells (PEMFCs) but challenging. Here, we report a nitrogen coordination-induced strong metal–support interaction that can tune the surface atoms of ORR-inactive PGM clusters into efficient and durable active sites. Taking Rh as an example, the carbonization of Rh-overdoped zeolitic imidazolate framework-8 results in a large number of Rh clusters (with a little atomic Rh) in porous nitrogen-doped carbon. The cluster surface atoms coordinate with the nitrogen of the carbon support, forming much stronger metal–support interactions than that of common N-doped carbon-supported metal nanoparticles. The activity of surface-activated Rh clusters is close to that of Pt/C. The regulation rules for the surface active sites inherit most of the characteristics of the corresponding single-atom catalysts, but without their severe instability problem. This surface activation strategy has also shown applicable to other PGMs, thereby it is a promising way to alleviate the reliance of PEMFCs on platinum.
研究领域:
材料科学
·
催化
·
能源工程
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Plasma Processes and Polymers
·
2023
·Vol. 20
·期 5
·2200228
·
IF 3.5
Siyuan Sui,Hongmei Sun,Guohua Ni,Yafeng Liu,Huan Zheng,Tao Sun,Ling Kong,Zhongyang Ma,Fangli Yuan
The surface of polytetrafluoroethylene (PTFE) is activated by argon (Ar), Ar mixed with water vapor (Ar-H 2 O), and a mixture of Ar, water vapor, and ammonia (Ar-H 2 O-NH 3 ) plasmas and then grafted onto polymerized dopamine/ethylene imine and immobilized heparin. Oxygen-containing functional groups are all introduced onto the PTFE surface treated by three types of plasma. The amount of oxygen grafted is the highest in samples treated with Ar-H 2 O-NH 3 plasma compared to that treated with Ar-H 2 O plasma. An increase in the content of oxygen grafted onto PTFE contributes to an increase in the thickness and cross-linking bond of the polymeric interlayer and then raises the density of the heparin coating. The thickness of the polydopamine/polyethylenimide intermediate layer on the surface of PTFE treated with Ar-H 2 O-NH 3 plasma is 4.8 ± 0.3 μm, and the density of the immobilized heparin coating was 95 μg/cm 2 .
研究领域:
材料科学
·
表面化学
·
生物医学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）