International Journal of Applied Ceramic Technology
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2014
·Vol. 12
·期 4
·823-829
·
IF 1.215
Rujie He,Daining Fang,Feng He,Yefan Wu
The influences of graphite particle size and HNO 3 treatment on microstructure and cell performance of the NiO–YSZ anode-supported solid oxide fuel cells were investigated. The peak power density for the cells using 1, 3, and 6 μm graphite was 679, 603, and 549 mW/cm 2 , respectively. HNO 3 treatment was an efficient approach to improve the wettability of graphite in water, to modify the microstructure and to enhance the cell performance. The peak power density for the cell using HNO 3 -treated graphite (1 μm) was 766 mW/cm 2 , approximately 13% higher than that of the cell using pristine graphite.
研究领域:
材料科学
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能源工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Fengzhen Zhang,Jianbo Liao,Jianjiang Lu,Junfeng Niu
Carbon nitride (CN), oxygen-doped carbon nitride (CNO), HNO 3 oxidized CN (CN-10) and CNO (CNO-10), were synthesized and used to catalyze ozonation of para -chlorobenzoic acid ( p -CBA) and atrazine in aqueous solution. Pre-doping oxygen atom into CN could create extra defects for grafting more carboxyl groups during HNO 3 oxidation , which was verified by much lower formation energy of CNO-10 than that of CN-10. Density functional theory and room temperature electron paramagnetic resonance (EPR) analysis signified the changes of electronic structure afforded by extensively grafted carboxyl groups. The incorporation of carboxyl groups distorted the carbon nitride framework and changed the spatial dimensions of CN and CNO, which attenuated the characters of delocalized π-electrons in conjugated structure. Moreover, the introduction of carboxyl groups reduced the pore diameter and nano-size distributed in aqueous solution for CN-10 and CNO-10 relative to those of CN and CNO. Results showed that the elimination efficiency of p -CBA by catalytic ozonation and R ct (standard reactivity metric for catalytic ozonation process) with CNO-10 improved 1.12- and 1.48-fold relative to those with CN-10, respectively, far surpassing non-catalytic ozonation. The removal of ozone-resisted compounds by CNO-10 catalyzed ozonation was not significantly affected by bicarbonate and NOM, and it was promoted by natural surface water resulting in 87.4% p -CBA removal in 30 min. Mechanistic evaluation demonstrated that carboxyl groups were the main active sites, catalyzing ozone decomposition into hydroxyl radical through radical chain reaction. This work provides fundamental supportive of pre-doping oxygen atom into CN before HNO 3 functionalization, which could incorporate more carboxyl groups on surface compared to conventional strategy, further enhancing catalytic activity in ozonation.
研究领域:
材料科学
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环境化学
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催化
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水处理
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2021
·Vol. 328
·期 3
·991-1000
·
IF 1.371
Cai Jialing,Feng Jiahui,Li Jiahui,Feng Yu,Liu Fuping,He Feifang,Yu Haoqi,Zhang Zimin,Hu Yanqin,Hua Rong
This paper characterized the microstructure and physical properties of the scale from a uranium mine in Xinjiang by SEM, XRD and FT-IR. Based on the orthogonal experiment design, the formula of HClO 4 : EDTA: (NaF + HNO 3 ) = 4:1:5 is selected. The results show that the scale remover has the functions of dissolution, lattice damage and dispersion. The selected collaborative scale removal method can effectively remove the scale in the uranium mining process and has certain application value.
研究领域:
化学工程
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环境科学
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材料科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Xiaoling Li,Haibo Zhu,Cong Liu,Pei Yuan,Zhangxiang Lin,Jiangtao Yang,Yuanyuan Yue,Zhengshuai Bai,Tinghai Wang,Xiaojun Bao
Hollow mesoporous carbon submicrospheres (HMCNs) have been successfully synthesized via a facile silica-assisted sol–gel strategy, which were further treated with KOH or/and HNO3 to obtain four adsorbents with different structures and surface properties for the removal of dibenzothiophene (DBT). KOH activation can effectively adjust the micro/mesoporous structure by increasing the number of micropores, and HNO3 oxidation can modify the surface properties by introducing oxygen-containing functional groups. HMCNs treated with KOH first and then HNO3 are the best for DBT removal with the adsorption capacity of 33.20 mg S·g–1, which is nearly 45% higher than that of activated carbon with the same treatment. Notably, the adsorption equilibrium can be achieved within only 5 min, much faster than active carbon owing to the existence of abundant mesopores favorable to the diffusion of DBT. The negative ΔG° from thermodynamics result suggests it is a favorable and spontaneous adsorption process.
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
Colloid and Interface Science Communications
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2020
·
IF 2.831
Ziyang He,Qiang Huang,Liucheng Mao,Hongye Huang,Meiying Liu,Junyu Chen,Fengjie Deng,Naigen Zhou,Xiaoyong Zhang,Yen Wei
In this study, we developed a rapid microwave-assisted Diels-Alder reaction to prepare hydroxylated ND; then the ionic copolymers functionalized ND composites were obtained through direct surface-initiated Ce(IV)/HNO 3 redox polymerization by utilization of the hydroxyl groups and the resultant ND based composites were utilized for adsorptive removal of copper ions. The results demonstrated the Pseudo-second-order model can well describe the adsorption kinetic of ND-poly(AA -co- MPC) and it has been confirmed that the adsorption behavior is initiative and endothermic and related thermodynamic parameters (△G, △H, △S). The Langmuir isotherm model is better to describe the adsorption isotherms and the temperature experiment results show the best pH environment is pH 7–9. The results above demonstrated the ND-poly(AA -co- MPC) prepared by Ce(IV)/HNO 3 redox polymerization shows great potential in environmental treatment and remediation and the easy, mild, hydrous polymerization strategy can be exampled in the field of material surface modification.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 313
·期 2
·309-318
·
IF 1.282
Wang Zhipeng,Huang Huang,Ding Songdong,Hu Xiaoyang,Zhang Lirong,Liu Ying,Song Lianjun,Chen Zhili,Li Shimeng
Abstract Two diglycolamide homologs, N,N,N′,N′ -tetraoctyl-3,6-dioxaoctane diamide (DOODA) and N,N,N′,N′ -tetraoctyl-3,6,9-trioxaundecane diamide (TOUDA), were synthesized. Their extraction behaviors of Am 3+ and Eu 3+ were investigated and compared with those of N,N,N′,N′ -tetraoctyl-3-oxapentane diamide (TODGA). The extraction ability toward Am 3+ and Eu 3+ decreased with increasing etheric oxygen number in the extractant structure. In contrast to TODGA, an very interesting inversion on the selectivity occurred for DOODA and TOUDA, which were more favor of extracting Am 3+ than Eu 3+ . The maximum SF
Am/Eu of 3.5 for DOODA can be achieved at 3.0 mol/L HNO 3 . The stoichiometries of extracted species and extraction thermodynamic parameters were also presented. Graphical Abstract
研究领域:
化学
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核化学与放射化学
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DOI
高影响因子
FULLERENES NANOTUBES AND CARBON NANOSTRUCTURES
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2021
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IF 1.869
Zhaoyang Jia,Jian Wei,Yuan Wang,Yichang Jiang,Hao Zhang
Cement-based composites with thermoelectric effect have important application prospects in alleviating urban heat island effect, low-energy snow and ice melting on winter roads, and low-cost scale energy conversion and harvesting. Great progress has been made in the study of the thermoelectric properties of cement-based composites enhanced with carbon materials, and the addition of carbon materials increases the electrical conductivity of cement-based composites, but easily decreases the Seebeck coefficient. Reduced graphene oxide (RGO) by Cl2/HNO3 pretreatment increased the electrical conductivity of cement-based composites while also improving the Seebeck coefficient of cement-based composites, which was attributed to the increased content of RGO defects, which increased the effective mass of carriers, thus enhancing the Seebeck effect of cement-based composites and improving the thermoelectric properties of cement-based composites. When the Cl2 pretreatment RGO content was 5.0wt%, the electrical conductivity of the cement-based composites was 1.54 S/cm, the Seebeck coefficient was −56.61 μV/°C and the ZTmax value of 1.08 × 10−4 was achieved, with average output power and thermoelectric conversion efficiency of 2.91 × 10−2 mW/m2 and 3.79 × 10−6. The cement-based composites prepared by Cl2 pretreatment of RGO achieved the highest ZT at the same carbon material content.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 84
·期 1
·251-261
·
IF 1.915
Hu Chunlian,Zhang Wei,Chen Yuantao,Ye Na,YangJi DaWa,Jia Haizhe,Shen Yanting,Song Minna
Here adsorption studies were proposed on a carboxylated sludge biochar (CSB) material modified by HNO 3 to assess its capacity in the removal of cobalt from aqueous solution. The as-prepared sludge biochar material was characterized by Brunauer-Emmett-Teller (BET) analysis, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), energy-dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The isotherm process could be well described by the Langmuir isotherm model. The adsorption kinetics indicated that cobalt adsorption followed a pseudo-second-order kinetics model. The mechanism between Co(II) and biochar involved electrostatic interaction, ion exchange, surface complexation and physical function. The adsorption capacity on CSB was as high as 72.27 mg·g −1 , surpassing original sludge biochar (SB) as CSB had abundant oxygen-containing functional groups and many hydroxyls, plus the BET surface areas increased when SB was modified by HNO 3 , which stimulated adsorption effect. Therefore, this work shows that CSB could be used as an efficient adsorbent to remove Co(II) in wastewater. The material has abundant oxygen-containing functional groups, which are beneficial for binding Co(II). The isotherm process could be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The adsorbent has an efficient adsorption capacity for Co(II), as high as 72.27 mg·g −1 .
研究领域:
环境科学
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化学工程
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水处理
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吸附技术
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DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2014
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IF 3.916
Yunhui Xu,Xin Liu,Xuelan Liu,Jiulong Tan,Hongling Zhu
The bamboo pulp cellulose fiber was oxidized with HNO 3 /H 3 PO 4 –NaNO 2 mixture to obtain oxidized cellulose containing different levels of carboxyl content and with high yields. The effects of HNO 3 /H 3 PO 4 –NaNO 2 mediated oxidation on structure and properties of the fiber were investigated. The results showed that an increase in carboxyl content and weight loss of oxidized fibers appeared with increasing oxidation time. Compared with the original cellulose, the oxidized fibers had lower crystallinity (29–40%) and thermal stability. The patterns of 13 C NMR, X-ray diffraction and other testing methods revealed that the oxidation mostly occurred at C6 primary hydroxyl groups of cellulose. Moreover, an oxidized fiber with 94.14–98.59% of high yields and 1.13–3.56% of carboxyl content was obtained in the range of oxidation time from 15 to 60 min, while its mechanical properties did not change significantly. This work presented some detailed information about structure–property correlations of oxidized bamboo pulp cellulose fibers and was useful in planning applications of these products.
研究领域:
材料科学
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高分子化学
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纤维素化学
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纤维技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Muhammad Hammad ul Haq,Xu Zhang,Fengqi Zhang,Alemtsehay Tesfay Reda,Dongxiang Zhang,Muhammad Zahid,Muhammad Khurram Tufail,Muhire Constantin,Noor Hasaan,Jinying Li,Xiyan Xu
The nuclear fuel rod contains mainly uranium (U) as the fuel and zirconium (Zr) as the cladding material. Improper disposition of the dissolved solution of the exhausted fuel rod releases radioactive acidic aqueous solution, which is a waste of U and Zr resources and also poses a great threat to the environment and living beings. The present work aims to selectively capture U and Zr from a 4 mol/L HNO 3 aqueous solution in the presence of competing ions including La, Zn, Cd, Gd, Ce, Sr, Mn, Cu and Ba. Trimethylolpropane trimethacrylate (TMPTMA) copolymerized with ethenylphosphonic acid (EPA). TMPTMA improved the mesoporous character and adsorption ability of the adsorbent towards U and Zr. The synthesized polymer adsorbent was characterized by SEM, EDS, FT-IR, TGA, XRD, BET, XPS, and NMR to study the adsorption. The results indicated that the EPA-POP-2 adsorbent showed considerable adsorption capacity towards U(VI) (374.1 mg g −1 ) and Zr(IV) (217.4 mg g −1 ) in a strong HNO 3 medium. Langmuir isotherm model fitted well to the experimental data, indicating that the monolayer adsorption process was dominating. The fitted pseudo-second-order (PSO) model represents that the adsorption mechanism is chemisorption. XPS, FT-IR, and DFT calculation results revealed that this adsorption capacity towards U and Zr was because of the P = O ligands present in the adsorbent. Van’t Hoff graph for U and Zr were also drawn to calculate the enthalpy, entropy, and Gibb’s free energy of the reaction. The reusability test showed that the adsorption capacity of synthesized adsorbent was high enough towards the U and Zr even after five consecutive cycles of adsorption and desorption.
研究领域:
核工程
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环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Jing Li,Yan Chen,Yongcai Zhang,Yanyan Zhao,Qian Zhang,Zhanjun Yang
This work reports an alternative preparation and evaluation of nanocrystalline N-modified CeO 2 as a visible-light-active photocatalyst . Nanocrystalline N-modified CeO 2 (which was abbreviated as CeO 2 –HNO 3 ) was synthesized directly via the solvothermal reactions of Ce(NO 3 ) 3 ·6H 2 O, concentrated (65–68 mass%) HNO 3 and toluene at 180 °C for 24 h. The composition, structure and optical property of CeO 2 –HNO 3 were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy and UV–vis diffuse reflectance spectroscopy. The photocatalytic activity of CeO 2 –HNO 3 was tested in the reduction of aqueous Cr 6+ under visible-light ( λ >420 nm) irradiation, and compared with that of CeO 2 –NH 3 (which denoted the product prepared when 25-28 mass% NH 3 ·H 2 O replaced 65–68 mass% HNO 3 ). It was observed that CeO 2 –HNO 3 exhibited much higher photocatalytic activity than CeO 2 –NH 3 in the reduction of aqueous Cr 6+ under visible-light ( λ >420 nm) irradiation. CeO 2 –HNO 3 may be a new promising visible-light-active photocatalyst in efficient utilization of solar energy for treating Cr 6+ wastewater.
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
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2023
·
IF 7.8
Shuyang Shi,Baozhong Ma,Ding Zhao,Xiang Li,Shuang Shao,Chengyan Wang,Yongqiang Chen
The new process ‘coal gangue/fly ash – HNO 3 pressure leaching (NAPL) –low-temperature pyrolysis’ was proposed by our team, which aimed to achieve the transformation of coal-based solid wastes from harmless to Al resource. For cost control, the regeneration of HNO 3 at a low cost was crucial for the process. Following NAPL of coal gangue and fly ash, massive amounts of Al(NO 3 ) 3 ·9 H 2 O were collected, with a decomposition temperature as low as 523 K. The energy consumption for low-temperature pyrolysis could be supplied by the combustion of residual carbon (6.96 wt%) during the thermal activity of coal gangue, allowing HNO 3 to be regenerated and recycled without extra heat supply . However, little research has been done on the pyrolysis behavior and kinetics of Al(NO 3 ) 3 ·9 H 2 O, which was examined in this study. The pyrolysis characteristics of Al(NO 3 ) 3 ·9 H 2 O were assessed by TG-DSC analysis. Further experiments and XRD/FTIR/MS analysis revealed that phase evolution of Al(NO 3 ) 3 ·9 H 2 O followed the sequence of Al(NO 3 ) 3 ·9 H 2 O→ Al(NO 3 ) 3 ·nH 2 O→ Al(NO 3 ) 3 ·3Al(OH) 3 ·5/2 H 2 O→ AlOOH→ Al 2 O 3 . Subsequently, the thermodynamic (∆ G , ∆ H , ∆ S ) and kinetic ( E a , A ) parameters were calculated based on the thermogravimetric data by the iso-conversional methods. And the mechanism models and functions were identified via the Malek method. Finally, the economic evaluation of pyrolysis indicated that 5.04 × 10 –3 Nm 3 of natural gas was consumed during pyrolysis of one mole Al(NO 3 ) 3 ·9 H 2 O, equivalent to 44.33 $ per ton of Al 2 O 3 . As a basic research of Al(NO 3 ) 3 ·9 H 2 O pyrolysis, this paper enhances related theories of the NAPL process.
研究领域:
材料科学
·
热工工程
·
无机化学
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废弃物资源化
·
过程工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）