CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Aijia Zhang,Jing Liu,Yingju Yang,Yingni Yu,Dawei Wu
Lead removal from flue gas continues to be an important environmental issue. Adding sorbents in the furnace is a reliable method to control lead emission. Modified kaolin sorbent developed by a combined method of thermal pre-activation and phosphate impregnation was first applied to capture lead from flue gas. Modified kaolin exhibited higher PbCl 2 removal performance than raw kaolin at 800–1100 ℃. The best adsorption performance of raw and modified kaolin was obtained at 1000 ℃ with adsorption efficiencies of 76.72 % and 85.87 %, respectively. The adsorption capacity of modified kaolin was about 283.51 mg/g at 1000 ℃. Lead aluminosilicate and lead phosphate were produced in the adsorption reaction. O 2 was conducive to the conversion of PbCl 2 to PbO, and directly participated in the formation of lead aluminosilicate· H 2 O was in favor of the adsorption reaction, and reduced the energy barrier for dechlorination of PbCl 2 , and promoted the eutectic melting process. SO 2 and NO inhibited PbCl 2 removal due to the competitive adsorption between SO 2 /NO and PbCl 2 at the active sites. High concentration of HCl can obviously suppress the reaction of PbCl 2 and modified kaolin. Quantum chemistry calculations were conducted to identify the active sites, and to uncover the molecular-level interaction of PbCl 2 and modified kaolin. Theoretical results manifested that PbCl 2 adsorption was chemisorbed on kaolin (0 0 1) surface. The adsorption energies of PbCl 2 on raw kaolin and modified kaolin were − 124.60 and − 205.90 kJ/mol, respectively. Al, O and P atoms of modified kaolin were identified as the active sites for PbCl 2 adsorption.
研究领域:
环境科学
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材料科学
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量子化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
·
IF 8.5
Linjie You,Weiguo Chen,Dongming Qi,Zhihua Cui,Sateesh Bandaru
Cotton fabrics, as both a polysaccharide and a high-molecular-weight polymer, are typically dyed with reactive dyes, which require a high amount of salt and produce significant colored effluent, increasing treatment complexity. This paper presents a novel and revolutionary reactive dyeing technique based on diazo pre-activation and coupling coloration of cotton fibers, which is distinct from conventional reactive dyeing methods. It demonstrates a room-temperature, salt-free reactive dyeing method to address problems like high energy consumption, significant salt usage, wastewater treatment challenges, the long duration from dye preparation to application, and the difficulty of recycling cotton fibers in reactive dyeing processes. This method combines dye preparation and dyeing by amination, diazotization, and coupling. It produces salt-free, room-temperature dyeing in <4 h, which is substantially less time than a standard reactive dyeing procedure that requires both dye synthesis and application. Furthermore, cotton fabrics can be endowed with bright, deep, and diverse colors, achieving superior colorfastness with ratings of 3–4 or more and K / S values exceeding 12. Moreover, dyed cotton fabrics can be easily decolorized by alkaline washing, producing alkaline washed cotton (AWC), while preserving their good whiteness and recyclable nature.
研究领域:
纺织科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Science China-Chemistry
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2016
·Vol. 59
·期 11
·1369-1375
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IF 2.429
Liu Shunjie,Qin Yusheng,Guo Hongchen,Wang Xianhong,Wang Fosong
Synthesis of polyols from carbon dioxide (CO 2 ) is attractive from the viewpoint of sustainable development of polyurethane industry; it is also interesting to adjust the structure of the CO 2 -polyols for versatile requirement of polyurethane. However, when renewable malonic acid was used as a starter, the copolymerization reaction of CO 2 and propylene oxide (PO) was uncontrollable, since it proceeded slowly (13 h) and produced 40.4 wt% of byproduct propylene carbonate (PC) with a low productivity of 0.34 kg/g. A careful analysis disclosed that the acid value of the copolymerization medium was the key factor for controlling the copolymerization reaction. Therefore, a preactivation approach was developed to dramatically reduce the acid value to ~0.6 mg(KOH)/g by homopolymerization of PO into oligo-ether-diol under the initiation of malonic acid, which ensured the controllable copolymerization, where the copolymerization time could be shortened by 77% from 13 to 3 h, the PC content was reduced by 76% from 40.4 wt% to 9.4 wt%, and the productivity increased by 61% from 0.34 to 0.55 kg/g. Moreover, by means of preactivation approach, the molecular weight as well as the carbonate unit content in the CO 2 -diol was also controllable.
研究领域:
材料科学
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化学工程
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可持续发展
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
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2016
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IF 4.803
Shuang-Tao Guo,Shi-Xi Zhao,Kun Bi,Yu-Feng Deng,Kai Xiong,Ce-Wen Nan
In recent years, Li-rich layered cathode materials have caught more and more attention; however, their low-temperature performance have hardly been researched and reported. In this work, typical layered Li-rich oxides (0.55Li 2 MnO 3 ·0.45LiNi 1/3 Co 1/3 Mn 1/3 O 2 ) are successfully synthesized by co-precipitation method. And their electrochemical properties have been investigated emphatically at 25 °C and 0 °C. Results show that the reversible capacity of as-prepared Li-rich oxides exhibit much dependence on temperature from ∼230 mAh·g −1 (25 °C), ∼160 mAh·g −1 (10 °C), ∼70 m mAh·g −1 (0 °C) to ∼50 mAh·g −1 (−5 °C). Our analyses indicate that there are several factors responsible for the capacity loss at low temperature: (1) the deactivation of Li 2 MnO 3 component; (2) the limited kinetic of Li + intercalation into MnO 2 ; (3) the increase of electrochemical impendences, especially the charge-transfer resistance ( R ct ); (4) the decrease of Li ion diffusion coefficient ( D Li+ ). And we find that pre-activation at room temperature is a quite effective way to improve its electrochemical performances at low temperature. In addition to the above four factors, for the first time, we suggest that the lattice contraction with decreasing temperature should also be considered.
研究领域:
材料科学
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电化学
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DOI
高影响因子
Frontiers of Earth Science
·
2022
·Vol. 17
·期 1
·251-261
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IF 2.273
Chen Yu,Zhao Hao,Xia Mingzhe,Cheng Hongfei
The sharp increase in the demand for lithium (Li) for high-energy-storage battery materials due to its high specific energy and low negative chemical potential render Li a geopolitically significant resource. It is urgent to develop a low-cost, efficient method to improve lithium extraction. Herein, Li ion (Li + ) adsorption in coal-bearing strata kaolinite (CSK) was studied. The effects of pre-activation acid leaching (meta-kaolinite/H 2 SO 4 , MK-HS) and dimethyl sulfoxide intercalation (coal-bearing strata kaolinite/dimethyl sulfoxide, CSK-DMSO) on the Li + adsorption capacity were studied under the same adsorption conditions. The results indicated that the adsorption was completed in 60 min under alkaline conditions (pH = 8.5), a high solution concentration (400 mg/L), and a low dosage (1 g/100 mL); and the comprehensive adsorption capacity is MK-HS > CSK-DMSO > CSK. Furthermore, the DMSO intercalation caused the interlayer spacing of the CSK to increase, which provided more space for Li + to enter and increase the adsorption capacity. After thermal pre-activation and acid leaching, structural failure and lattice collapse resulted in the presence of more micropores in the MK-HS, which resulted in a 10-fold increase in its specific surface area and caused coordination bond changes (Al(VI) to Al(IV)) and leaching of aluminum (Al) from the lattice. It is proposed that these structural changes greatly improve the activity of CSK so that Li + cannot only adsorb onto the surface and between the layers but can also enter the lattice defects, which results in the MK-HS having the best adsorption performance. Combined with the adsorption kinetics analysis, the adsorption methods of CSK and two modified materials include physical adsorption and chemical adsorption. In this study, the adsorption capacity of CSK and its modified products to Li were explored, providing a new option for the reuse of CSK and the extraction of Li.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2025
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IF 21.1
Yanan Huang,Yan Zhao,Dawei Song,Yaqin Shi,Huan Chen,Bo Niu,Donghui Long,Yayun Zhang
This study uncovers a synergistic Fe-Mo dual-atom catalytic mechanism that enhances peroxymonosulfate (PMS) activation and pollutant degradation through dynamic electron management and substrate pre-activation. A nitrogen-doped carbon-supported FeMo dual-atom catalyst (FeMo/NC) was synthesized and systematically analyzed using XAFS, in situ Raman, DFT calculations, and electrochemical tests. The FeMo/NC-PMS system achieved 99 % ciprofloxacin (CIP) degradation within 10 minutes (rate constant: 0.402 min −1 ), maintained > 90 % efficiency across pH 1–13, and exhibited minimal Fe/Mo leaching (<0.1 ppm) with 90 % retention after five cycles. Mechanistic studies revealed that Mo stabilizes Fe valence states via electron transfer, strengthens Fe-N coordination, and promotes pollutant pre-activation on Mo sites while enabling selective 1 O 2 generation at Fe sites. This work establishes a dual-atom design strategy to optimize electron redistribution and interfacial interactions in Fenton-like systems. The demonstrated compatibility with membrane filtration (100 % CIP removal in wastewater) highlights its potential for practical water remediation applications.
研究领域:
环境科学
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催化化学
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材料科学
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产品关联
DOI
高影响因子
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
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2020
·Vol. 646
·期 15
·1285-1291
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IF 1.24
Siyuan Li,Jiapeng Ji,Zeheng Li,Lijing Yan,Wei Jiang,Min Ling,Zhan Lin,Chengdu Liang
The application of Li-rich and Mn-based layered cathode materials is impeded by the discharge voltage decay and capacity fading upon cycling, despite their high specific capacity. Here, we combine pre-activation and nanoscale defects modification of lithium rich and manganese based layered materials to mitigate the above two serious problems through improved anionic redox activity and Li + conductivity. The optimum constructed nanoscale defects rich cathode material delivers a reduced voltage fading rate of 1.27 mV per cycle compared to 3.7 mV per cycle for the pristine material after 200 cycles at 1 C rate. Moreover, the nanoscale defects rich material delivers a high specific discharge capacity of 173.1 mAh · g –1 with a high capacity retention of 99.5 % after 200 cycles at 1 C rate superior than the pristine material (89.3 mAh · g –1 and 53.4 %, respectively). This study highlights the reversibility of oxygen redox in electrochemical stability and effectiveness of nanoscale defects in stabilize voltage.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Chengfu Deng,Zhibing He,Jinglin Huang,Lei Liu,Yansong Liu,Tao Wang,Guo Chen,Yong Yi,Kai Du
Aqueous asymmetric sodium-ion supercapacitors (ASSCs) with high energy density assembled from all-inorganic materials are expected to provide high-efficiency power sources for intelligent electric vehicles and off-grid systems. However, it is still challenging to fabricate high-performance positive materials by a simple method and rationally assemble ASSCs to meet the demand of ultralong cycle life and high energy/power density. Here, a simple pre-activation strategy was introduced into the α-MnO 2 electrode with a microcrystalline nanosheet structure to improve the Na-storage performance. The sodium-ions concentration was optimized by tuning charge-discharge parameters. Impressively, the pre-activated electrode achieved superior capacitance retention after 10,000 cycles, high volumetric capacitance of 377 F cm −3 and low charge transfer resistance of 5.9 Ω. Based on the facile operability of the proposed pre-activation strategy, it can be expected to be easily ported to other Li/K/Zn-storage, providing a novel avenue for the exploration of positive electrode materials with outstanding electrochemical behaviors. A novel ASSC was fabricated by matching α-MnO 2 //WO 3 electrodes, exhibiting wide voltage of 2.0 V, high energy/power density (0.965 W h cm −3 /65.2 W cm −3 ) and ultralong cycle life. This work proposes a simple strategy to develop high-performance positive materials and assemble ASSC with high energy/power density and long-term stable operation.
研究领域:
电化学
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材料科学
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能源存储
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
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2023
·
IF 5.5
Huang Liyuan,Su Ruobing,Xi Fengna
Sensitive determination of noradrenaline (NE), the pain-related neurotransmitters and hormone, in complex whole blood is of great significance. In this work, an electrochemical sensor was simply constructed on the pre-activated glassy carbon electrode (p-GCE) modified with vertically-ordered silica nanochannels thin film bearing amine groups (NH2-VMSF) and in-situ deposited Au nanoparticles (AuNPs). The simple and green electrochemical polarization was employed to pre-activate GCE to realize the stable binding of NH2-VMSF on the surface of electrode without the use of any adhesive layer. NH2-VMSF was conveniently and rapidly grown on p-GCE by electrochemically assisted self-assembly (EASA). With amine group as the anchor sites, AuNPs were in-situ electrochemically deposited on the nanochannels to improve the electrochemical signals of NE. Owing to signal amplification from gold nanoparticles, the fabricated AuNPs@NH2-VMSF/p-GCE sensor can achieve electrochemical detection of NE ranged from 50 nM to 2 μM and from 2 μM to 50 μM with a low limit of detection (LOD) of 10 nM. The constructed sensor exhibited high selectivity and can be easily regenerated and reused. Owing to the anti-fouling ability of nanochannel array, direct electroanalysis of NE in human whole blood was also realized.
研究领域:
分析化学
·
纳米技术
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电化学
·
生物传感器
✓ 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）