INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
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2023
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IF 3.4
Wenxia Zhao,Xin Liu,Xuan Song,Caifang Zhang,Huaijun Chen,Xinwei Li,Kaihong Hui,Wei Zhao,Liang Qiao,Hao Zhu,Yi Cheng,Zenglin Wang
The purpose of this study was to enhance the adhesion strength between the epoxy resin (EP) substrate and the electroless copper plating layer by utilizing a MnO 2 –H 2 SO 4 –H 2 O–Na 4 P 2 O 7 system for surface modification. The effect of the volume ratio of V H2SO4 :V H2O and the duration of surface modification on various surface characteristics and adhesion strength was examined. The results provide valuable insights into the relationship between these factors and their impact on the properties of the surface. Optimal results were achieved with a volume ratio of V H2SO4 :V H2O at 3:1, a surface modification time of 20 min, Na 4 P 2 O 7 content of 30 g L −1 , and a modification temperature of 50 °C. Following the surface modification treatment, the EP substrate surface exhibited many deep micro-holes, significantly improving surface roughness . Due to the enhanced roughness on the surface and the application of suitable modifications, the contact angle on the EP substrate surface exhibited a significant decrease from 94.6° to 19.5°. This alteration caused the surface to transition from hydrophobic to hydrophilic . The adhesion strength between the EP substrate and the electroless copper plating layer was significantly increased to 0.74 kN m −1 . This improvement was attributed to the combined effects of surface roughness and hydrophilicity of the substrate surface.
研究领域:
材料科学
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表面工程
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DOI
高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Qinzheng Hu,Shuzhen Cui,Kanjun Sun,Xiuting Shi,Wenxing Miao,Xiangbing Wang,Hui Peng,Guofu Ma
In recent years, the research focus of flexible supercapacitor is to improve its energy density . The recently reported improved energy storage method is to introducing suitable redox-additive in gel electrolytes to enhance their redox-activity. Herein, a novel stretchable, redox-active and double-network 4-hydroxy-2,2,6,6-tetramethylpiperidine 1-oxy-containing polyacrylamide/alginate/H 2 SO 4 (PAM/SA/H 2 SO 4 /TEMPOL) hydrogel electrolyte is prepared by radical cross-linking polymerization and solvent displacement process. The PAM/SA/H 2 SO 4 /TEMPOL hydrogel possesses superior stretchability (750 %) because of the electrostatic interactions between the -NH 3+ groups of the PAM and the -COO − groups of SA . In addition, the introduction of the TEMPOL additive into PAM/SA/H 2 SO 4 /TEMPOL hydrogel electrolyte of flexible EDLC can gain a high specific capacitance (386 F g −1 ) and high energy density of 24.5 Wh kg −1 , which is due to dual redox reactions both positive/negative electrode. This study provides a new strategy for designing a multifunctional redox hydrogel electrolyte.
研究领域:
材料科学
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电化学
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能源存储
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DOI
高影响因子
BIORESOURCE TECHNOLOGY
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2012
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IF 4.98
Fengcheng Li,Shuangfeng Ren,Wei Zhang,Zhengdan Xu,Guosheng Xie,Yan Chen,Yuanyuan Tu,Qing Li,Shiguang Zhou,Yu Li,Fen Tu,Lin Liu,Yanting Wang,Jianxiong Jiang,Jingping Qin,Shizhong Li,Qiwei Li,Hai-Chun Jing,Fasong Zhou,Neal Gutterson,Liangcai Peng
Xylans are the major hemicelluloses in grasses, but their effects on biomass saccharification remain unclear. In this study, we examined the 79 representative Miscanthus accessions that displayed a diverse cell wall composition and varied biomass digestibility . Correlation analysis showed that hemicelluloses level has a strong positive effect on lignocellulose enzymatic digestion after NaOH or H 2 SO 4 pretreatment. Characterization of the monosaccharide compositions in the KOH-extractable and non-KOH-extractable hemicelluloses indicated that arabinose substitution degree of xylan is the key factor that positively affects biomass saccharification. The xylose/arabinose ratio after individual enzyme digestion revealed that the arabinose in xylan is partially associated with cellulose in the amorphous regions, which negatively affects cellulose crystallinity for high biomass digestibility. The results provide insights into the mechanism of lignocellulose enzymatic digestion upon pretreatment, and also suggest a goal for the genetic modification of hemicelluloses towards the bioenergy crop breeding of Miscanthus and grasses.
研究领域:
植物学
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生物能源
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遗传改良
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DOI
高影响因子
LETTERS IN ORGANIC CHEMISTRY
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2023
·Vol. 20
·期 11
·1089-1093
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IF 0.8
Li Runlai,Zhang Zhenming,Ji Jiangyu,Li He,Liu Chi,Li Shu-an
The conventional mixed acid nitration of aromatic hydrocarbons has been extensively applied in the industry, but usually, it is not highly selective and may cause environmental concerns regarding the disposal of large volumes of mixed acids. This paper proposes a new method of orientational
para-nitration of easily hydrolyzable aromatic compounds. Under the optimized reaction conditions, the easily hydrolyzed aromatic compounds were nitrated in the H2SO4-HNO3-H3PO4 system to yield paste-like products. And the product could
be directly filtered out from the mixed acid, avoiding a large amount of waste liquid caused by pouring the reaction mixture into ice water by the traditional post-treatment method. The selectivity and yield of nitration by this method have been improved, and the mother liquor could be reused,
thereby reducing the cost and pollution.
研究领域:
化学工程
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Ke Zhang,Xu Zhao,Sihan Chen,Liping Chang,Jiancheng Wang,Weiren Bao,Hui Wang
In chemical cycles to produce hydrogen , the H 2 S splitting cycle and the sulfur-iodine (S I) water splitting cycle both share the Bunsen reaction and HI decomposition. Therefore, they have to overcome the same challenges in the technology development, one of them being the complex and difficult separations of the mixed hydroiodic acid and sulfuric acid solution after the Bunsen reaction. To avoid the separations, this paper studies the electrolysis of the HI/H 2 SO 4 /H 2 O/toluene mixture, focusing on the electrochemical characterization of the Pt electrode by using linear sweep voltammetry (LSV) and cyclic voltammetry (CV). The results show that hydrogen is identified from the gas generated from the cathode in electrolysis. Iodide oxidation is the main reaction in the anode chamber and no significant side reactions are observed. Iodine deposition on the anode surface increases the resistance to iodide diffusion to the anode. However, it can be mitigated by adding toluene in or applying stirring to the anolyte HI/H 2 SO 4 solution. The Pt cathode and sulfuric acid catholyte also work stably.
研究领域:
化学工程
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电化学
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可再生能源
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DOI
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Xiaofang Luo,Shengtao Zhang,Lei Guo
Inhibition performance of omeprazole for mild steel in 0.1M H2SO4 solution has been investigated through different approaches including potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), weight loss, scanning electron microscope (SEM) experiments and theoretical calculations. The experimental results reveal that omeprazole is an effective inhibitor with a maximum achievable inhibition efficiency of 98.5%, and the adsorption of omeprazole on the mild steel surface is found to obey the Langmuir adsorption isotherm. Polarization curves illustrate that omeprazole acts as a mixed-type inhibitor, and EIS demonstrates that an adsorption film of the inhibitor is formed on mild steel surface. Moreover, quantum chemical calculations and the molecular dynamics (MD) simulation are also performed to gain the further insight of the inhibition mechanism of omeprazole on steel corrosion, which show that the possible adsorption centers of the omeprazole molecule are benzene ring, benzimidazole ring, sulphinyl and the nitrogen atom of the hexaheterocyclic.
研究领域:
材料科学
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腐蚀科学
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电化学
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表面科学
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应用化学
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理论化学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2018
·
IF 3.956
Ting Lu,Yucui Hou,Weize Wu,Muge Niu,Wei Li,Shuhang Ren
Carboxylic acids are considered as an important group of chemicals. Direct conversion of cellulose to formic acid (FA) by vanadium(V(V))-contained catalyst is of significant conceptual and practical interest. A second metal (from Mg(II), Ca(II), Al(III), Cr(III), Mo(VI), Mn(II), Cu(II), or Fe(III)) incorporated into V(V)-contained catalyst system was screened to further improve the oxidation of cellulose by O 2 to yield FA. Fe(III) exhibited the best performance and effects of reaction parameters on the conversion of cellulose in NaVO 3 -FeCl 3 -H 2 SO 4 aqueous solution were investigated. Cellulose could be rapidly converted, and the yield of FA (66.8%) was higher than that obtained by the single use of FeCl 3 (48.4%) or NaVO 3 (57.6%). The conversion of cellulose in another V(V)-contained catalyst system (H 5 PV 2 Mo 10 O 40 ) was explored to verify the universal enhancement of FeCl 3 . Influences of the second metal Fe(III) on the V(V)-contained catalyst system and mechanism of cellulose oxidation in the V(V)-Fe(III)-H 2 SO 4 system were studied. Compared with single use of V(V), the employment of Fe(III) alone is not active enough in the oxidative C C bond cleavage . V(V) other than Fe(III) is the main active species for selective oxidation of substrates. The incorporation of Fe(III) and V(V) shows both synergistic and competitive relationships. Both the synergistic and competitive effects are beneficial to increase FA yield, as they promote the oxidation of V(IV) to V(V), increase oxidative ability, and inhibit the overoxidation to by-product CO 2 . The catalyst system was reused four times without decline in activity.
研究领域:
化学工程
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催化化学
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DOI
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Yanyan Xu,Wenwen Xiao,Pengli Ge,Wenguang Zeng,Qingshan Liu,Zhengyuan Gao,Yongbo Yan
This work aimed to develop a high-efficiency and reliable alternative for conventional and toxic corrosion inhibitor. A novel tetrazole derivative (1-Phenyltetrazole-5-thiol, PTT) that possessed excellent anti-corrosion capacity was exploited for the first time. Based on the traditional electrochemical investigation, morphological observation, and computer modeling, inhibition ability and adsorption type of PTT for X70 steel in 0.5 M H 2 SO 4 were varied. The electrochemical results showed that PTT was a mixed organic inhibitor, which could retard charge transfer impedance, and slowed down the corrosion rate of steel. Specifically, the highest inhibition efficiency was 95.1% when the added PTT dose was 2 mM. The adsorption model showed that the PTT film was formed via powerful physicochemical adsorption. As shown in theoretical calculations, the lower Δ E , higher μ values and E binding value of PTT corresponded to supreme adsorption performance, which was also a manifestation of the PTT high-efficiency corrosion inhibition.
研究领域:
材料科学
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电化学
·
计算化学
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产品关联
DOI
高影响因子
HYDROMETALLURGY
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2026
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IF 6.3
Gengjin Zhang,Yanfang Huang,Longfei Jia,Tianze Chen,Yizhuang Wang,Shengpeng Su,Wenjuan Wang,Hu Sun,Guihong Han
Novel peroxo-complexation strategy was used to purify Nb-rich solution. • NbOF 5 2− transformation to NbO 2 F 5 2− greatly lowers its binding energy with MIBK. • Selectivity coefficient for Sb over Nb was enlarged by over 2300 times. • Nb 2 O 5 product met the high-purity specifications regarding Ta and Sb impurities. The efficient separation of Ta and Sb from Nb in hydrometallurgical processes remains a significant challenge due to their similar chemical behaviors. In this study, a novel peroxo-complexation strategy was introduced to enhance the selectivity of methyl isobutyl ketone (MIBK) extraction in an HF-H 2 SO 4 system. With the addition of H 2 O 2 , the extraction efficiencies of Ta and Sb reached 99.6% and 99.7%, respectively, while the co-extraction of Nb was only 2.32%. The selectivity coefficients of Sb/Nb and Ta/Nb significantly increased from 0.63 and 34.7 to 1461 and 6501, respectively. Stepwise stripping using H 2 SO 4 and pure water effectively recovered Nb and Ta/Sb from the loaded organic phase. Raman spectroscopy and quantum chemical calculations elucidated the mechanism of the enhanced separation selectivity. The peroxo-ligand selectively coordinates with Nb to transform it from NbOF 5 2− to NbO 2 F 5 2− , thereby weakening the negative surface potential of the fluorine atoms bonded to Nb. The binding energy between Nb ions and MIBK decreases from −172 kJ mol −1 to −104 kJ mol −1 , and thus the disparity in the affinity of Nb ions and Ta/Sb ions for MIBK is magnified. Overall, this peroxo-coordination approach provides an efficient and simple pathway for the effective purification of Nb solutions. Download: Download high-res image (176KB) Download: Download full-size image
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
·
IF 4.084
Lijian Wang,Yanqun Zhu,Guangshi Fu,Yong He,Yanwei Zhang,Zhihua Wang
The sulfur–iodine (SI) cycle is deemed to be one of the most promising alternative methods for large-scale hydrogen production by water splitting, free of CO 2 emissions. Decomposition of hydrogen iodide is a pivotal reaction that produces hydrogen . The homogeneous conversion of hydrogen iodide is only 2.2% even at 773 K [1]. A suitable catalyst should be selected to reduce the decomposition temperature of HI and attain reaction yields approaching to the thermodynamic equilibrium conversion. However, residual H 2 SO 4 could not be avoided in the SI cycle because of incomplete purification. The H 2 SO 4 present in the HI feeding stream may lead to the poisoning of HI decomposition catalysts. In this study, the activity and sulfur poisoning of Ru and Ni catalysts loaded on carbon and alumina , respectively, were investigated at 773 K. HI conversion efficiency markedly decreased from 21% to 10% with H 2 SO 4 (3000 ppm) present, which was reversible when H 2 SO 4 was withdrawn in the case of Ru/C. In the case of Ru/C and Ni/Al 2 O 3 , catalyst deactivation depends on the concentration of H 2 SO 4 ; the higher the concentration of H 2 SO 4, the greater the severity of deactivation. Catalysts before and after sulfur poisoning were characterized by transmission electron microscopy (TEM), energy-dispersive X-Ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction (XRD). Experimental results and characterization of poisoned and fresh catalysts indicate that the catalyst deactivation could be ascribed to the competitive adsorption of sulfur species and change in its surface properties.
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
·
IF 7.8
Chen Lin,Chen Wenjie,He xiaofeng,Zhang Duchao,Liu Weifeng,Yang Tianzu
Utilization of waste rare earth polishing powder (REPPW) is significant for protecting the environment and enhancing strategical rare earth resource recycling. However, efficient extraction of rare earth oxides (REOs) from REPPW in an environmental-friendly and low-cost manner remains a great challenge in this area. In this study, a reductive H 2 SO 4 leaching process using the low toxicity thiourea as the reducing agent is proposed to extract rare earth elements (REEs) from the REPPW. Under the optimal conditions of thiourea concentration of 0.078 mol·L −1 , H 2 SO 4 concentration of 1.50 mol·L −1 , temperature of 353 K, and liquid-to-solid ratio of 15 mL·g −1 , the leaching ratios of Ce and La reached 93.8% and 93.2%, respectively. Moreover, the thiourea behavior during the REPPW leaching process was studied. The results indicates that the thiourea not only acted as reductant but also tended to decompose in a CS(NH 2 ) 2 →(SCN 2 H 3 ) 2 →S route. The decomposed thiourea amounted to 18.07% of its original dosage, which formed precipitation during aging of the leachate. However, it influenced neither Ce/La concentration in the leachate nor purity of the product. The recycled REOs with purities higher than 93% were prepared from the leachate by oxalate precipitation-oxidation roasting, showing no relation with the aging time.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Feiyue Wang,Xue Song,Yongde Liu,Jie Zhang,Jihong Zhao,Yue Chen
Diclofenac (DCF), a widely used pharmaceutical ingredient, exhibits long-lasting properties and significant ecotoxicity in aquatic ecosystems. In this study, a new granular adsorbent, GSBE@C H-CTAB , was synthesized to remove DCF by initially granulating powder spent bleaching earth carbon (SBE@C) with polytetrafluoroethylene (PTFE) emulsion as a binding agent, followed by a co-modification process involving H 2 SO 4 and cetyltrimethyl ammonium bromide (CTAB). The adsorption capacity of the prepared adsorbent for DCF under the best conditions was 4.26 mg/g. In a wide pH range, GSBE@C H-CTAB could maintain a high adsorption capacity and show a good reusability. The presence of the three cations inhibited the adsorption of DCF (inhibition effect: Mg 2+ >Al 3+ >Na + ). The adsorption process conformed to the pseudo-second-order kinetic model and Langmuir isotherm model. From the theoretical evaluation results, it could be inferred that DCF molecules were adsorbed on GSBE@C H-CTAB surface in both horizontal and non-horizontal directions at all operating temperatures. The main mechanisms of adsorption included electrostatic interaction, pore filling interaction, π-π interaction and H bond interaction. The granular adsorbent GSBE@C H-CTAB prepared in this study could effectively remove DCF, treat waste with waste, and solve the problem that powder adsorbent was easy to lose and difficult to recover, which was of great significance for the remediation of polluted water.
研究领域:
环境科学
·
材料科学
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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）