JOURNAL OF POWER SOURCES
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2023
·
IF 9.2
Yabiao Pei,Weikang Zhu,Runfei Yue,Jie Yao,Xin Liu,Lianqin Wang,Junfeng Zhang,Yan Yin,Michael D. Guiver
Adjusting catalyst/ionomer agglomerate is crucial to a high-performance catalyst layer (CL), particularly for non-precious metal catalysts . As a sacrificial component, the solvent plays a vital role during the CL formation process and resulting microstructure, determining the performance of the anion exchange membrane fuel cells (AEMFCs). Here, solvent mixtures of isopropanol (IPA) and tetrahydrofuran (THF) are studied for the controllable construction of the Co/Fe–N–C CL. The results indicate that the aggregate state of the ionomers and catalysts and the final CL microstructure strongly depend on the ratio of IPA and THF. The CL prepared with IPA: THF = 1:2 (v/v) shows a homogeneous distribution of Co/Fe–N–C catalysts, embedded in the ionomer matrix, due to the fast volatilization and low viscosity of the catalyst ink. The Co/Fe–N–C CL with high moisture adsorption behavior and retention ability results in a high performance AEMFC with peak power density of 545.3 mW cm −2 at 80 °C. The obtained results can guide the rational design of microstructure in non-precious metal CLs for high-performance AEMFCs.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2023
·Vol. 332
·期 6
·1953-1960
·
IF 1.6
Luo Qingyun,Wang Chongshi,Zhu Wei,Yu Hongchao,Wang Chunyan,Chen Chuanhong
Due to its high adsorption capacity and adsorption efficiency, polymer gel shows excellent performances in the treatment of wastewater containing thorium. In this work, glutaraldehyde cross-linked N -(4-Aminobenzoyl)-ʟ-glutamic acid modified chitosan (CCS-AGA) was used to adsorb Th(IV) ions from aqueous solutions for the first time. FT-IR and SEM results revealed the chemical structure and surface morphology of this material. The influence of solution pH, contact time and initial concentration of Th ions on the adsorption of Th(IV) by CCS-AGA was investigated. The experimental data suggest that the adsorption behavior of CCS-AGA could be accurately predicted by the Langmuir model. The maximum theoretical adsorption capacity of CCS-AGA for Th(IV) was 162 mg/g. Moreover, this material exhibited excellent reusability and adsorption selectivity for Th(IV).
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ACS Omega
·
2023
·
IF 4.1
Yuming Nie,Ye Li,Huanjun Wang,Dongfang Guo,Lianbo Liu,Yonghong Fu
Fly ash from coal-fired power plants can enter chemical absorbents along with flue gas. Silica and metal oxides are the main components of fly ash. To explore the effect of the metal oxides on absorbents, we analyzed the integrated CO2 absorption–desorption process using N-methyldiethanolamine (MDEA) as the standard and an amine absorbent after adding different metal oxides. The effects of each metal oxide on CO2 capture by the MDEA solution, including CO2 reaction heat, absorption rate, cyclic loading, and carbonation rate, were assessed. It was found that supplementation with appropriate calcium oxide and magnesium oxide proportions accelerates the CO2 absorption rate and shortens the saturation time of the MDEA solution by 9%–17%. Magnesium oxide and calcium oxide were precipitated as carbonates during absorption. The CO2 reaction heat of the MDEA solution increased by 95% after adding magnesium oxide, thereby significantly increasing the energy consumption of the desorption process. On the basis of the experimental studies, the increase in CO2 absorption rate by MDEA after adding MgO and CaO may be mediated through two different mechanisms.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Yuting Wang,Fengming Zhang,Jia Liu,Bin Yang,Yue Yuan,Yanyan Zhou,Shuyun Bi
A method was established for detecting the content of nitrofurazone (NFZ) by fluorescence quenching of N-Acetyl-L-Cysteine (NAC) coated cadmium telluride quantum dots (CdTe QDs). By means of transmission electron microscopy (TEM) and multispectral methods such as fluorescence and ultraviolet visible spectra (UV–vis), the synthesized CdTe QDs were characterized. The quantum yield ( φ ) of CdTe QDs was measured as 0.33 by reference method. The CdTe QDs had a better stability, the RSD of fluorescence intensity was 1.51% in three months. NFZ quenching the emission light of CdTe QDs was observed. The analyses of Stern-Volmer and time-resolved fluorescence suggested the quenching was static. The binding constants ( K a ) between NFZ and CdTe QDs were 1.14 × 10 4 (293 K), 0.74 × 10 4 (303 K) and 0.51 × 10 4 (313 K) L mol −1 . The hydrogen bond or van der Waals force was the dominated binding force between NFZ and CdTe QDs. The interaction was further characterized by UV–vis absorption as well as Fourier transform infrared spectra (FT-IR). Using fluorescence quenching effect, a quantitative determination of NFZ was carried out. The optimal experimental conditions were studied and determined as following: pH was 7 and contact time was 10 min. The effects of reagent addition sequence, temperature and the foreign substances including some metals (Mg 2+ ; Zn 2+ ; Ca 2+ ; K + ; Cu 2+ ), glucose, bovine serum albumin (BSA) and furazolidone on the determination were studied. There was a high correlation between the concentration of NFZ (0.40 – 39.63 μg mL −1 ) and F 0 / F with the standard curve F 0 / F = 0.0262 c + 0.9910 ( r = 0.9994). The detection limit (LOD) reached 0.04 μg mL −1 (3 S 0 / S ). The contents of NFZ in beef and bacteriostatic liquid were detected. The recovery of NFZ was 95.13% – 103.03% and RSD was 0.66% – 1.37% ( n = 5).
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FUEL PROCESSING TECHNOLOGY
·
2023
·
IF 7.5
Jie Xu,Xiaowei Liu,Rui Li,Boxiong Shen,Zijian Zhou,Lidan Deng,Lei Liu,Xinbo Zhu
Converting CO 2 into renewable fuel via photocatalysis is of significance to solving the energy crisis and climate change. However, the limited electron transfer in single catalysts always limits the reduction reaction. In this work, a p-n heterojunction was constructed between Cr doped MgAl–LDH (abbreviated as LDH) and Co 3 O 4 for visible-light-driven fuel production. Since LDH and Co 3 O 4 both have the sufficient potentials to drive CO 2 photoreduction, the constructed type-II heterojunction is more favorable for electron utilization efficiency. The optimal Co 3 O 4 /LDH heterojunction exhibited the highest CO evolution rate of 7.42 μmol•g −1 •h −1 and a CO selectivity of 90.5% with TEOA as sacrificial agent . The further characterizations highlight that the addition of Co 3 O 4 greatly improves the light absorption and the heterojunction effectively promotes the reverse migration of electrons and holes. This work investigates and verifies the designed type-II heterojunction based on MgAl–LDH, which has the guidance for the design of heterojunction catalysts and promotes the practical application of MgAl–LDH in photocatalytic region.
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MOLECULES
·
2023
·Vol. 28
·期 6
·2435
·
IF 4.6
Fulin Wang,Zhenzhen Yu,Kaiyang Shi,Xiangwei Li,Kangqiang Lu,Weiya Huang,Changlin Yu,Kai Yang
The green and clean sunlight-driven catalytic conversion of CO2into high-value-added chemicals can simultaneously solve the greenhouse effect and energy problems. The controllable preparation of semiconductor catalyst materials and the study of refined structures are of great significance for the in-depth understanding of solar-energy-conversion technology. In this study, we prepared nitrogen-doped NiO semiconductors using a one-pot molten-salt method. The research shows that the molten-salt system made NiO change from p-type to n-type. In addition, nitrogen doping enhanced the adsorption of CO2on NiO and increased the separation of photogenerated carriers on the NiO. It synergistically optimized the CO2-reduction system and achieved highly active and selective CO2photoreduction. The CO yield on the optimal nitrogen-doped photocatalyst was 235 μmol·g−1·h−1(selectivity 98%), which was 16.8 times that of the p-type NiO and 2.4 times that of the n-type NiO. This can be attributed to the fact that the nitrogen doping enhanced the oxygen vacancies of the NiOs and their ability to adsorb and activate CO2molecules. Photoelectrochemical characterization also confirmed that the nitrogen-doped NiO had excellent electron -transfer and separation properties. This study provides a reference for improving NiO-based semiconductors for photocatalytic CO2reduction.Keywords:NiO;nitrogen doping;photocatalysis;reduction of CO2
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Miao Liu,Zhenghao Lu,Linghan Yang,Renmin Gao,Xinying Zhang,Yongjing Wang,Yonghao Wang
Electrocatalytic reduction of nitrate to ammonia is an effective method for the recycling of NO 3 - -N in the field of nitrate polluted water treatment . In this work, Co-N-C was prepared in this work by pyrolysis of Co-based metal organic framework at 700 °C and it can achieve 100 % selectivity to ammonia under the optimum experiment conditions. Impressively, no harmful nitrite generated in the reduction process because the reduction rate constant of Co-N-C for NO 2 - -N is higher than that of NO 3 - -N. Experiment results show that the chemical adsorption rather than electrostatic adsorption dominated among Co-N-C and free NO 3 - , which is significant for the subsequent electronic reduction process. Mechanism analysis indicated the active hydrogen (H*) reduction mechanism is predominate for Co-N-C but the direct electron mechanism is predominate for Co-C during the reduction from NO 3 - to NO 2 - . While for Co-N-C and Co-C, the subsequent reduction of NO 2 - to NH 4 + was conducted by the direct electron mechanism. The present work not only explores high performance for the selectively electrocatalytic reduction from nitrate to ammonia but also promote new inspiration for the preparation of other Co-based functional materials for reducing the production of nitrite.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Lixue Yang,Xiuyan Wang,Shengyan Yin,Xinjian Shi,Li Wang,Ping She,Yudong Song,Zhenning Liu,Hang Sun
Peroxymonosulfate (PMS)-based advanced oxidation processes (AOPs) have great potential for water treatment. Herein, a 3D nitrogen-doped porous carbon (3D-NPC) aerogel has been prepared by direct ink writing of a hydrogel containing agarose, urea, sodium chloride and hydroxypropyl methylcellulose, and subsequent freeze-drying and pyrolysis. The obtained 3D-printed aerogel exhibits multiple desirable properties including self-supportability, hierarchical porous structure, and good structural stability, and thus can be used as a monolithic catalytic filter in flow-through experiments. The 3D-NPC catalysts have demonstrated excellent PMS-based performances toward degradation of organic dyes and disinfection of bacterial culture. The degradation efficiency of Rhodamine B by 3D-NPC is as high as 97.2% within 5 min and the high degradation efficiency can be sustained for 5 h. Moreover, 100% inactivation of bacteria by 3D-NPC can also be maintained for at least 5 h, which far exceeds those of traditional catalysts. The key reactive species of the 3D-NPC + PMS system is found to be singlet oxygen in both Rhodamine B degradation and antibacterial disinfection, where the non-radical pathway contributes to the majority of the catalytic activity. Our work has innovatively presented a 3D-printed monolithic catalyst for efficient flow-through degradation and disinfection.
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Analytical Methods
·
2023
·Vol. 15
·期 21
·2677-2684
·
IF 3.1
Shuwen Hua,Baichun Wang,Jiayi Wang,Bing He,Chuan-Fan Ding,Yongyao Wu,Yinghua Yan,Rongrong Xuan
In this study, we developed a green, one-step hydrothermal carbonization (HTC) method that used water as the sole solvent to create boronic acid group-rich carbonaceous spheres (BCS). When the abundant boronic acid groups on the carbonaceous spheres react with the hydroxyl groups on the glycans in an alkaline environment, the glycopeptides are specifically captured. The results showed that BCS had excellent detection limits (0.1 fmol μL−1), selectivity (1 : 1000), and stability (10 cycles). In addition, the BCS also demonstrated excellent glycopeptide enrichment capabilities in complex biological samples; 219 glycopeptides attributed to 167 glycoproteins and 235 glycopeptides related to 166 glycoproteins in PE patient and normal pregnancy control serum were identified by nano LC-MS/MS, respectively. In addition, the molecular function of heparin binding and biological process of complement activation, positive regulation of immune response, and positive regulation of tumor necrosis factor production were significantly different between PE patients and healthy pregnant women according to gene ontology analysis, indicating that these may be associated with the development of PE.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Baoli Wang,Shuchang Luo,Yijing Ai,Yucen Yao,Siyue Zhang,Yuhao Huang,Xiaoping Zhang,Wei Sun
To enhance the catalytic activity of oxygen evolution reaction (OER), tremendous efforts have been contributed to tune the morphology, structure and component of the commonly used transition metal oxides electrocatalysts . Herein, hollow Co 3 O 4 nanocapsules/N-doped carbon (Co 3 O 4 /NC) composite was synthesized via combining a carbonization process and an oxidation route by employing biomass as carbon source. The obtained composite presents a porous hierarchical construction, in which hollow Co 3 O 4 nanocapsules with an average diameter of 60 nm are uniformly dispersed and anchored on the carbon carrier. Electrochemical measurements reveal that the resulted Co 3 O 4 /NC presents outstanding catalytic performance towards OER with only 328 mV to obtain the current density of 10 mA cm −2 along with a Tafel slope of 84 mV dec −1 , which are superior than those of benchmark catalyst RuO 2 . Besides, the influences of the loading amount of Co 3 O 4 and sintering temperature on OER performance are studied in detail. The outstanding catalytic activity can be ascribed to the typical hollow nanocapsules structure and abundant oxygen deficiency, which can afford a mass of catalytic active sites. Therefore, this work puts forward valuable reference for the design of high-efficiency biomass derived catalysts in the field of OER.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Shuangbo Huang,Longmiao Zhang,Jinxi Luo,Deyuan Wu,Kaidi Ma,Yiling Chen,Shuo Ma,Li Feng,Fuyong Li,Dingfa Liu,Jinping Deng,Chengquan Tan
Sows are highly sensitive to deoxynivalenol (DON) and susceptible to reproductive toxicity caused by oxidative stress, but the potential mechanisms and effective interventions remain unclear. Here, we investigated the role of two antioxidants (cysteamine and N-acetyl-cysteine) in regulating the reproductive performance, redox status, and placental barrier function of sows and their potential mechanisms under DON exposure. Maternal dietary supply of antioxidants from day 85 of gestation to parturition reduced the incidence of stillbirths and low-birth-weight piglets under DON exposure. Moreover, the alleviation of DON-induced reproductive toxicity by dietary antioxidants was associated with the alleviation of placental oxidative stress, the enhancement of the placental barrier, and the vascular function of sows. Furthermore, in vivo and in vitro vascularized placental barrier modeling further demonstrated that antioxidants could reverse both DON transport across the placenta and DON-induced increase of placental barrier permeability. The molecular mechanism of antioxidant resistance to DON toxicity may be related to the signal transducer and activator of the transcription-3-occludin/zonula occludens-1 signaling pathway. Collectively, these results demonstrate the potential of antioxidants to protect the mother from DON-induced reproductive toxicity by alleviating placental oxidative stress and enhancing the placental barrier.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Daoguang Teng,Peng Jin,Shiqiao Yang,Wenhuan Guo,Zhuang Zhao,Guoli Zhou,Peng Li,Yijun Cao
Various cost-effective polycyclic aromatic hydrocarbons (PAHs) were used to fabricate hyper-cross-linked polymers (HCLPs) via an external cross-linker knitting method (ECLKM) followed by N-source impregnation modification. Multiple characterization techniques and thorough tests confirmed that the resultant thermally stable materials featured large specific surface areas (up to 2870 m2 g–1), narrow pore distributions (<0.70 nm), and high pore volumes (up to 1.09 cm3/g). Effects of porosities and N-doping modification ways on HCLPs’ CO2 capture capacities have been fully studied via controlling experiments. Remarkably, HCLP 1 prepared using naphthalene without further modification possessed the highest CO2 uptake capacity (up to 3.8 mmol g–1), indicating that porosities dominated the CO2 uptake process of HCLPs compared with N-doping modification. This study offers a facile strategy to construct HCLPs with great CO2 capture performances using PAHs via a simple one-pot ECLKM.
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