CHEMOSPHERE
·
2016
·
IF 3.698
Ying Han,Zhong-lin Chen,Ji-min Shen,Ji-he Wang,Wei-wei Li,Jun Li,Bin-yuan Wang,Li-na Tong
The role of Cu(II) in the reduction of N -nitrosodimethylamine (NDMA) with zero-valent metals was investigated by determining the effects of Cu(II) on the removal, kinetics, products, and mechanism. NDMA removal was enhanced, and all reactions followed a pseudo-first-order kinetic model except for the Fe and Fe/0.1 mM Cu(II) systems. The iron mass-normalized pseudo-first-order rate constants ( k MFe ) increased with the Cu(II) concentration. The zinc mass-normalized pseudo-first-order rate constants ( k MZn ) were identical to those with the Cu(II) concentrations from 0.1 mM to 1.0 mM and were higher with 2.0 mM Cu(II). The types of products detected were unchanged. Some unknown products were also found. NDMA was reduced to 1,1-dimethylhydrazine (unsymmetrical dimethylhydrazine , UDMH). Then, UDMH was reduced into dimethylamine (DMA) by the Fe/Cu(II) and Zn/Cu(II) systems. Catalytic hydrogenation was proposed as the reduction mechanism. Several copper species, such as Cu(OH) 2 in the Fe/Cu(II) system and Cu 2 O and Cu(OH) 2 in the Zn/Cu(II) system enhanced NDMA reduction. Differences between the Fe/Cu(II) and Zn/Cu(II) systems were caused by the reduction potentials and surface conditions of the different metals and the copper species in the various systems.
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Journal of Energy Chemistry
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2016
·
IF 2.322
Ran An,Guizhuan Xu,Chun Chang,Jing Bai,Shuqi Fang
Butyl levulinate (BL) is a promising new candidate as diesel fuel and fuel additive. In this study, an efficient process for a one-pot synthesis of BL from biomass-derived carbohydrates in butanol medium with the catalysis of metal sulfates was developed. The catalytic activity of a series of metal sulfates for the synthesis of BL from fructose was investigated. Among various metal sulfates, ferric sulfate Fe 2 (SO 4 ) 3 was found to be the most efficient catalyst, which gave a remarkably high BL yield of 62.8 mol% under the conditions of 463 K, 3 h, a catalyst dosage of 5.0 g/L, and fructose concentration of 25 g/L. Different carbohydrates including glucose, cellulose , inulin and sucrose were also used for one-pot synthesis of BL with the catalysis of Fe 2 (SO 4 ) 3 , showing the yields of 39.6, 30.5, 56.6 and 50.1 mol%, respectively. In addition, the recycling and reuse of Fe 2 (SO 4 ) 3 was studied by characterizing them using powder X-ray diffraction (XRD), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS). A plausible reaction pathway for the one-pot synthesis of BL from fructose was proposed. This study provides a facile and feasible way for the synthesis of BL from biomass.
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ACS Applied Materials & Interfaces
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2016
·
IF 7.145
Rong Bai,Qing Zhang,Lanlan Li,Ping Li,Yan-Jie Wang,Oudjaniyobi Simalou,Yanling Zhang,Ge Gao,Alideertu Dong
N-Halamine-based antibacterial materials play a significant role in controlling microbial contamination, but their practical applications are limited because of their complicated synthetic process and indistinct antibacterial actions. In this study, novel antibacterial N-halamine-containing polymer fibers were synthesized via an one-step electrospinning of N-halamine-containing polymers without any additives. By adjusting the concentration of precursor and the molecular weight of polymers, the morphology and size of the as-spun N-halamine-containing fibers can be regulated. The as-spun fibers showed antibacterial activity against both Gram-positive and Gram-negative bacteria. After an antibacterial assessment using different biochemical techniques, a combined mechanism of contact/release co-determined killing action was evidenced for the as-spun N-halamine-containing fibers. With the aid of contact action and/or release action, this combined mechanism can allow N-halamines to attack bacteria, making the as-spun fibers wide in the application of antibacterial fields, whatever it is in dry or wet environment. Also, a recycle antibacterial test demonstrated that the as-spun fibers can still offer antibacterial property after five recycle experiments.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 1
·70-73
·
IF 1.024
Li Bochao,Lin Xinrui,Zhang Yumin,Zhang Dawei,Xiao Yang,Lin Feng
A new series of 1-substituted phenyl-2-(1 H -1,2,4-triazol-1-yl)ethanone derivatives 3 a― 3 f was synthe-sized and their structures were characterized by IR, 1 H NMR, 13 C NMR and HRMS spectral analysis. Antimicrobial activities of the derivatives were measured against both bacteria and fungi. In vitro antifungal evaluation showed that five compounds( 3 b― 3 f) had growth inhibitory effects on the tested fungus, and three of them( 3 b, 3 c and 3 e) showed special efficacy against Gram negative bacteria.
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RSC Advances
·
2016
·Vol. 6
·期 79
·75626-75631
·
IF 3.289
Jinbao Liu,Yilin Liu,Yani Ai,Hongyan Chen,Chenqi Feng,Ningbo Yu,Ning Fu,Sheng Han,Hualin Lin
Two-dimensional MoS2 nanoplates within N-doped carbon from polyaniline (PANI) were fabricated by a simple hydrothermal method. During this process, PANI facilitated the absorption of inorganic precursors and provided confined spaces for the growth of MoS3 nanoparticles in the case of the unwanted aggregations. The unique nanostructure and composition of the nanoplates achieved high capacity. When CNFs@NC/MoS2 was used as an anode in lithium-ion batteries, it maintained an ultrahigh capacity of 900.9 mA h g−1 at a current density of 200 mA g−1 for 80 cycles. Even when the current density returned to 100 mA g−1 after cycling at different rates, a capacity of 998 mA h g−1 was still achieved.
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Journal of Cleaner Production
·
2024
·
IF 9.7
Shuaishuai Guo,Guowen Peng,Qingming Zeng,Lulin Guo,Chao Zhang,Qingyan Zhang,Xijun Fu,Junwen Lv,Qingyi Zeng
Developing efficient, stable, and user-friendly adsorbents for removing uranium from radioactive wastewater is critical for ensuring the security of nuclear energy development. Here, a fixed adsorbent (nZVI@NC/CF), composed of in-situ derived N-doped carbon (NC) encapsulated nano zero-valent iron (nZVI) coated on carbon fiber (CF), was synthesized via carbonizing Prussian blue decorated CF, and used to synergistically adsorb and reduce UO 2 2+ from contaminated water. The optimized nZVI@NC/CF exhibited an extremely high adsorption capacity of 2120.27 mg g −1 with a superior adsorption rate, and about 56.8 % fixed uranium was reduced into insoluble U(IV) species. This outstanding adsorption activity could be ascribed to the strong reducing property of nZVI and the package of NC that effectively prevented the agglomeration of nZVI and facilitated the adsorption and reduction of UO 2 2+ due to the rich adsorption sites and good charge transport property. The nZVI@NC/CF also showed excellent anti-interference properties and regeneration performance that exhibited great potential in treating real uranium wastewater and extracting uranium from seawater. Mechanism study revealed that the fixation of UO 2 2+ was mainly achieved through the synergistical adsorption by NC and reduction by nZVI, complexation by hydroxyl groups, and hydrolytic precipitation by local OH − . This study underscores the potential of nZVI@NC/CF as a highly effective adsorbent material, and provides valuable insights into developing efficient, stable, and easily manageable materials for uranium recovery.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Wei Xia,Congling Li,Li Zhang,Xuemin Yu,Li Zheng,Rui Liu,Aifeng Lv
The development of highly efficient electrocatalysts is of utmost importance for advancing electrochemical energy conversion technologies. Transition metal sulfide heterostructure electrocatalysts have been widely studied and applied in electrocatalysis due to their highly inherent activity in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at the interface. We prepared NiS 2 /CoS 2 nanoparticle heterostructures doped with nitrogen-carbon nanotubes (CoS 2 /NiS 2 @N-CNTs) to induce the formation of bifunctional reaction sites. This design contributes to the excellent catalytic activity for electrocatalytic water splitting. The CoS 2 /NiS 2 @N-CNTs electrocatalyst exhibits prominent catalytic activities toward HER and OER, which required low overpotentials of 126 and 205 mV to yield the current density of 10 mA cm −2 in 1 M KOH. The prepared electrocatalysts exhibit fast reaction kinetics with tafel slopes of 71 and 82 mV dec −1 in HER and OER, respectively. The catalyst has a larger electrochemically active surface area (ECSA) of 1030 cm −2 and a strong electron transfer capability with an electrochemical impedance of 41 Ω. These properties are mainly attributed to the unique heterogeneous structure of the catalyst. In addition, CoS 2 /NiS 2 @N-CNTs catalyst is used as both the cathode and anode to fabricate a two-electrode system in a 1.0 M KOH solution measured at 1.53 V. Meanwhile, the stability measurement maintains for 23 h at a current density of 10 mA cm −2 with negligible degradation. This work has successfully developed an approach for rational design and novel synthesis of metal sulfide hybrids as bifunctional electrocatalysts with high activity and stability for overall water splitting.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Rongcong Li,Liu Yang,Ruizhi Li,Yingke Zhou
Carbon modified nitrogen-doped Fe 3 O 4 (N–Fe 3 O 4 @C) nanorod array directly grown on carbon cloth was fabricated. Nitrogen-doping and carbon shell effectively decrease the potential barrier of ion migration of the oxides and improve the electrochemical performance. An enhanced donor density of N-Fe 2 O 3 (7.6 × 10 15 cm −3 ) is achieved with optimized doping temperature. Following with carbon coated, the optimized N–Fe 3 O 4 @C electrode showed ultrahigh capacitance over an extended potential window and remarkable cycling performance. A new quasi-solid-state supercapacitor with N–Fe 3 O 4 @C and NiCoP@Ni(OH) 2 achieved high voltage to 2.0 V and high energy density (72.37 Wh kg −1 , 2.36 mWh cm −3 ).
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Meijing Cao,Jing Tian,Yang Zhou,WenLong Liu,Jin Dang,Weibing Li,Jiarun Li,Lei Wang
The low electrical conductivity and catalytic activity of transition metal sulfides have been identified as the primary factors limiting their application in the field of electrocatalytic water splitting. In this study, FeS 2 and Co-FeS x were initially synthesized through a hydrothermal method, followed by further annealing in an NH 3 atmosphere to obtain Co,N-FeS x . The introduction of Co led to adjustments in the electronic structure, resulting in the formation of FeS 2 /FeS (FeS x ) heterojunctions that facilitated accelerated charge transfer. Simultaneously, Co element doping increased the electrochemical active surface area, providing more active sites for the reactions. N element doping, on the other hand, introduced sulfur vacancies, thereby enhancing electrical conductivity and improving charge transfer efficiency. As a result, Co,N-FeS x exhibited significantly higher activities for the oxygen evolution reaction (OER) and overall water splitting compared to FeS 2 , with overpotentials of 290 mV and 330 mV, respectively, at a current density of 10 mA cm −2 . Furthermore, the catalyst demonstrated excellent stability. The designed structure of the catalyst provides theoretical support for the study of Fe-based catalysts in OER and overall water splitting.
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PLoS One
·
2017
·Vol. 12
·期 5
·e0178213
·
IF 2.806
Yangyang Wang,Fangfang Li,Xinling Ruan,Jian Song,Lv Lv,Liyuan Chai,Zhihui Yang,Lin Luo
A stable bacterial consortium (LV-1) capable of degrading di- n -butyl phthalate (DBP) was enriched from river sludge. Community analysis revealed that the main families of LV-1 are Brucellaceae (62.78%) and Sinobacteraceae (14.83%), and the main genera of LV-1 are Brucella spp. (62.78%) and Sinobacter spp. (14.83%). The optimal pH and temperature for LV-1 to degrade DBP were pH 6.0 and 30°C, respectively. Inoculum size influenced the degradation ratio when the incubation time was < 24 h. The initial concentration of DBP also influenced the degradation rates of DBP by LV-1, and the degradation rates ranged from 69.0–775.0 mg/l/d in the first 24 h. Degradation of DBP was best fitted by first-order kinetics when the initial concentration was < 300 mg/l. In addition, Cd 2+ , Cr 6+ , and Zn 2+ inhibited DBP degradation by LV-1 at all considered concentrations, but low concentrations of Pb 2+ , Cu 2+ , and Mn 2+ enhanced DBP degradation. The main intermediates (mono-ethyl phthalate [MEP], mono-butyl phthalate [MBP], and phthalic acid [PA]) were identified in the DBP degradation process, thus a new biochemical pathway of DBP degradation is proposed. Furthermore, LV-1 also degraded other phthalates with shorter ester chains (DMP, DEP, and PA).
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TETRAHEDRON
·
2017
·
IF 2.651
Shi-Yuan Liu,Lin-Yan Xu,Chun-Yu Liu,Zhi-Gang Ren,David James Young,Jian-Ping Lang
An efficient catalytic system containing [RuCl 2 (η 6 -p-cymene)] 2 and one P,N ligand, N-diphenylphosphino-2-aminopyridine ( L1 ) was loaded in catalyzing the alkylation of ketones with primary alcohols for a diverse array of substrates. Other five P,N ligands based on pyridin-2-amine and pyrimidin-2-amine were also examined in this reaction to explore the influence of steric hindrance and electronic effects. Monitoring by 1 H NMR and ESI-MS reveals a stable cationic L1 -coordinated ruthenium hydride intermediate, identified as [Ru(η 6 -p-cymene)(κ 2 - L1 )H] + . Organic intermediates consistent with a three-step dehydrogenation , alkylation and hydrogenation pathway were also observed. The final step in this reaction, the ruthenium-catalysed transfer hydrogenation reduction of α,β-unsaturated ketone with benzyl alcohol was performed separately.
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Small Structures
·
2024
·Vol. 5
·期 3
·2300418
·
IF 13.9
Bingkun Wang,Zheng Li,Huijuan Wu,Shan Zhang,Guanglin Zhang,Jinqiu Zhang,Shanshui Lian,Li Zheng,Zhongying Xue,Siwei Yang,Guqiao Ding,Wenwu Xu,Shiwei Tang,Gang Wang
Surface-enhanced Raman scattering (SERS) is a versatile spectroscopic technique, which plays a crucial role in enhancing analytical sensitivity, investigating interfacial reaction mechanisms, enabling biosensing, and fostering efficient catalysis. Currently, the common SERS substrates are primarily metal nanostructures, which entail high manufacturing costs, complex processes, and the metal surface undergo change over time and with environmental conditions. These issues limit the development of SERS technology. In this work, a nitrogen-doped graphene (N-graphene) hydrangea was synthesized on a silicon (Si) substrate using plasma-assisted chemical vapor deposition (PACVD), forming an N-graphene hydrangea/Si hybrid structure as a SERS substrate. This substrate offers the advantages of high stability, ultra-sensitivity, and reusability. The three-dimensional nano-cavity structure of graphene can increase the interaction between light and graphene, resulting in an increased localized electric field. Combining theoretical simulation analysis, the introduction of nitrogen (N) elements adjusts the Fermi level of graphene, promoting efficient charge transfer. In practical scenarios, Di(2-ethylhexyl) phthalate (DEHP), a commonly used plasticizer, has raised concerns due to its potential as an endocrine disruptor and carcinogen. The as-prepared SERS substrate achieves a remarkable detection limit of as low as 10 −8 m for DEHP, providing significant support for environmental conservation and human health.
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