CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2025
·
IF 3.7
Huagui Jin,Xuebin An,Shizhao Wang,Yunshan Wang,Gang Yang,Yong Sun
s This study investigates the removal of fluorine (F) impurities from phosphogypsum (PG) using steam as the reaction medium. The effects of the reaction atmosphere, temperature, time, and steam velocity on F impurities removal were systematically examined. The results showed that with a steam velocity of 0.0184 m·s −1 , a reaction temperature of 700 °C, and a reaction time of 60 min, the F removal rate reached 95.87%. Further investigations into the defluorination mechanism revealed that steam and SiO 2 synergistically enhance fluoride removal, playing a crucial role in improving the defluorination efficiency. Kinetic analysis of the defluorination process, based on the shrinking core model (SCM), indicated that internal diffusion is the rate-controlling step, with the activation energy of 30.12 kJ·mol −1 . This study identifies optimal conditions for PG defluorination and proposes a defluorination mechanism, contributing to the theoretical understanding of impurity removal through the thermal treatment of PG.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Renjun Si,Yan Li,Jie Tian,Changshu Tan,Shaofeng Chen,Ming Lei,Xin Guo,Shunping Zhang
Temperature modulation technology has been extensively used in metal oxide semiconductor (MOS) gas sensors, especially based on micro-hotplate sensor structure. The technique not only enhances the selectivity but also increases the sensor’s sensitivity by allowing it to exhibit a highly active surface due to the effect of oxygen accumulation. However, when the MOS sensor is in a state of high surface activity, the corresponding hydroxide formation may occur when exposed to water, negatively affecting the gas sensing performance and stability of the sensor. This study focuses on the stability of SnO 2 and In 2 O 3 gas sensors during storage process after temperature modulation test. The results indicate that SnO 2 exhibits good stability, while In 2 O 3 stability is poor. The mechanism responsible for deactivation was discussed with infrared spectroscopy results. The formation of In(OH) 3 was confirmed by high resolution transmission electron microscope , which further confirmed the above conclusion. These findings suggest that after temperature modulation, the gas sensitive materials stored in an atmospheric environment (20 ℃, 40%−60%RH) would generate hydroxides. When temperature modulation was repeated at (100–400 ℃), Sn(OH) 4 decompose into SnO 2 , thus maintaining stability. In contrast, the decomposition temperature of In(OH) 3 is higher. At 400 ℃, it will not decompose into In 2 O 3 in a short time, which would lead to poor stability.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2022
·
IF 7.72
Ling He,Ling Pan,Wei Zhou,Zibo Niu,Peng Xiao,Yang Li
In this work, the corrosion behavior of Yb 4 Hf 3 O 12 ceramics under CFAS coupled with water vapor environment at 1400 °C for 2–50 h was investigated. Results show that the CFAS were rapidly dissolved into ceramics under test environment, and then the Yb-Ca-Si apatite and Hf-rich fluorite phases were re-precipitated. Simultaneously, the water vapor corrosion mainly induced grain surface corrosion, resulting in the formation of corrosion pits and ridge-like structures. Moreover, the pores and microcracks caused by water vapor corrosion offer additional penetration path for CFAS melt.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2019
·
IF 2.433
Zhongbao Liu,Wenqi Gao,Xin Qi,Fengfei Lou,Huiwei Lang
In this article, MIL-101(Cr) powder material was successfully prepared by hydrothermal synthesis and combined with different mass fractions of CaCl 2 by immersion method to obtain MIL-101(Cr)/CaCl 2 composite materials. The physical properties of the adsorbent were determined by X-ray powder diffraction, N 2 adsorption/desorption isotherm, TGA and FTIR. The water vapor adsorption performance of MOFs was tested by a gravimetric instrument to analyze the underlying mechanism. Results indicated that the specific surface area, total pore volume, and pore size distribution of micropores and mesopores of MIL-101(Cr)/CaCl 2 composites decreased with increasing CaCl 2 content. When P/P 0 = 0.9, the water vapor equilibrium adsorption capacities of MIL-101(Cr), MIL-101(Cr)/CaCl 2 -10%, MIL-101(Cr)/CaCl 2 -20%, and MIL-101(Cr)/CaCl 2 -30% were 1.05, 0.88, 1.13, and 1.35 g/g, respectively. MIL-101(Cr)/CaCl 2 -30% agglomerated after water absorption, so MIL-101(Cr)/CaCl 2 -20% was selected as the final experimental material. The water vapor adsorption heat of MIL-101(Cr)/CaCl 2 -20% was 42–58 kJ/mol, which is close to the evaporation enthalpy of water (44 kJ/mol at 25 °C). The analysis of the adsorption kinetics showed the relatively uniform adsorption rate of MIL-101(Cr)/CaCl 2 -20%. Overall, MIL-101(Cr)/CaCl 2 -20% exhibited superior water vapor adsorption performance and have great potential for application to adsorption heat pumps.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COMBUSTION AND FLAME
·
2024
·
IF 5.8
Peihui Xu,Xingang Dong,Wenke Zhang,Yuxin Yang,Xueqin Liao,Jianzhong Liu
Overcoming the difficulty of ignition and combustion of aluminium in water vapour is the key to being applied in underwater propellant applications. The effect of coating or blending 20 mass% ammonium perchlorate (namely, AP@Al or AP–Al samples) on the ignition and combustion of Al particles in a 1.0 MPa water vapour–Ar environment was investigated using a constant temperature pressurized combustion chamber and a CO 2 laser. The results show that the combustion of Al particles in a water vapour–Ar environment is a non-homogeneous reaction and that agglomeration processes of Al droplets are observed. The ignition and combustion properties of the AP@Al and AP–Al samples under water vapour were greatly improved due to the decomposition of AP for heat/oxygen (particularly, O 2 provided a new pathway for AlO(g) generation) supply and the effect of dispersed particles. The maximum pressure change and combustion temperature ( T max ) were increased significantly for the AP@Al and AP–Al samples combustion, while their ignition delay time ( t i ) and combustion time ( t c ) decreased remarkably. In addition, the coating form is more effective in the combustion-promoting effect of AP than the blending form. Interestingly, the increase in water vapour concentration is not conducive to the ignition and combustion of samples in this work. It is probably because the reaction system is lean-fuel where the excess water vapour absorbs some of the heat and prevents effective collisions among the radicals. In addition, the chemical equilibrium largely influences the combustion temperature, resulting in a conspicuous effect of changes in water vapour concentration on the T max values. The reaction interface largely influences the combustion reaction rate of Al, so changes in particle size have a significant effect on the t i and t c values.
研究领域:
材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jiaqi Ruan,Chang Gao,Tao Deng,Changlei Qin
Li 4 SiO 4 sorbent attracts wide attention due to its high and stable CO 2 adsorption. However, the process of CO 2 capture is significantly affected by various impurities under the circumstance of industrial applications, and water vapor is one such impurity that needs to be well studied. Herein, we aim to evaluate the effect of water vapor on physicochemical characteristics of Li 4 SiO 4 -based sorbents during cyclic CO 2 adsorption and desorption and to understand the action mechanism of H 2 O molecules on CO 2 adsorption by Li 4 SiO 4 . Reaction tests show that water vapor can significantly enhance CO 2 adsorption performance of sorbents, but the promotion effect varies with the different presence of water vapor during reactions. Material characterization and DFT calculation reveal that although the presence of water vapor leads to deterioration of internal pore structure of the sorbent, H 2 O molecule will form OH – on the surface of Li 4 SiO 4 and further react with CO 2 to generate HCO 3 – , thus the adsorption energy with water vapor presenting is increased with an observation of promoted CO 2 adsorption.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2020
·
IF 3.693
Wu Yi,Yan Meng,Tian Chen,Liu Yuhang,Hua Zhongqiu
Gas sensors were fabricated from Cr2WO6 nanoparticles for NO2 detection. Low dimensional materials Cr2WO6 were prepared by a wet chemistry method followed by hydrothermal treatment. The morphology of the nanoparticles and their sensing properties to NO2 were investigated in both dry and humid conditions. Additionally, the sensing response was also characterized in a non-oxygen condition. It was concluded that the sensor responses in N2 conditions were higher than that in air conditions at 200°C. Moreover, the sensing characteristics were inhibited by water vapor at 200°C. The oxygen adsorption behavior was also investigated to verify the basic sensing mechanism of Cr2WO6 in the absence and presence of NO2 and water vapor separately. Based on the power law response, it was indicated that both NO2 and water vapor have a strong adsorption ability than oxygen ions of Cr2WO6 sensors.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
VACUUM
·
2024
·
IF 3.8
Ping-guo Jiang,Xiong-gang Lu,Wang-jun Peng,Hong Liu,Yao Zhu,Cai-song Yan,Jing-rong Zhao
This study investigates the structural evolution of blue tungsten reduction products when exposed to hydrogen under controlled water vapor partial pressures. The reduction of WO₂.₉ was achieved through hydrogen atom diffusion at 1050 °C. The Results indicate that, at low water vapor partial pressure, the reduction process of blue tungsten initiates on the surface and progresses inward, creating surface cracks on the clusters. These cracks enable water vapor to interact with the reduced tungsten (W) at their base, leading to the formation of needle-like WO₂.₇₂ phases that grow outward. Under high water vapor partial pressure, the morphology of the acicular WO 2.72 phase changes to a stacked structure. Additionally, W-OH bonds were identified in the reduction products, with the WO₂.₇₂ growth angles observed at approximately 12° relative to the tungsten particles, closely matching the interfacial model prediction of 13.41°. The results of this paper will provide theoretical support for the structural evolution of intermediate products during hydrogen reduction of blue tungsten.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Wang Xiangnan,Liu Tao,Yu Jingkun
(4YSZ) 0.93 (Fe 2 O 3 ) 0.07 and 9 mol% Y 2 O 3 stabilized ZrO 2 (9YSZ) were synthesized by co-precipitation method and their crystalline structure, microstructure, electronic conductivity, total conductivity were characterized. A limiting current oxygen sensor was assembled with (4YSZ) 0.93 (Fe 2 O 3 ) 0.07 dense diffusion barrier and 9YSZ solid electrolyte by Pt sintered-paste method. Influences of temperature ( T ), oxygen concentration ( x (O 2 )) and water vapor pressure ( p (H 2 O)) on sensing characteristics of the limiting current oxygen sensor were investigated. The crystalline structure of (4YSZ) 0.93 (Fe 2 O 3 ) 0.07 and 9YSZ belong to cubic structure with \({\bf{Fm}}\overline{{\bf{3}}}{\bf{m}}\) . The total conductivity of (4YSZ) 0.93 (Fe 2 O 3 ) 0.07 is higher than that of 9YSZ and the electronic and total conductivities of the samples meet the linear relationship with 1000/ T . The limiting current oxygen sensor exhibits excellent sensing characteristics under test conditions. The effects of T , x (O 2 ) and p (H 2 O) are as follows: Log( I L · T ) depends linearly on 1000/ T , I L depends linearly on x (O 2 ) and I L is not significantly dependent on p (H 2 O).
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THERMAL SPRAY TECHNOLOGY
·
2023
·Vol. 32
·期 8
·2460-2477
·
IF 3.1
Wu Duoli,Wu Haotian,Yuan Ziyi,Wei Xinlong,Zhang Chao
To investigate the influence of Mo addition and water vapor content on the high-temperature corrosion resistance of Ni-Al-based coatings, 0Mo, 5Mo, and 10Mo coatings were deposited by APS thermal spray onto stainless steels. The chlorine-induced corrosion test was conducted in an experimental environment simulating a biomass boiler. The results show that adding the Mo element lowers the coating's ability to resist corrosion without water vapor. The coating is more prone to peeling because Mo prevents the coating from eventually forming a protective oxide layer. Water vapor significantly speeds up the production of oxides and modifies their morphology and structure. The combined effects of Mo and water vapor increase the coating's ability to resist corrosion. The development of thick and protective Ni and Al oxide layers on the coated surface is aided by the acceleration of oxide production by water vapor and the alteration of oxide structure by Mo components.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
Separations
·
2025
·Vol. 12
·期 4
·86
·
IF 2.7
Wenlin Hang,Jiaxing Sun,Ronghang Zhao,Heng Chen,Jinjin Li
The presence of abundant water vapor in industrial organic waste gases greatly reduces the selective adsorption of volatile organic pollutants (VOCs). The polarity of the adsorbent and VOC molecules plays an important role in the adsorption process, especially in the presence of water vapor. In this paper, commercial coconut shell activated carbon (CSC) was modified by a thermal reduction treatment to obtain heat-treated coconut shell activated carbon (HCSC). CSC and HCSC exhibited similar pore structure characteristics but differed significantly in surface oxygen content (10.97% and 7.55%, respectively). Dynamic adsorption breakthrough experiments were conducted to determine the dynamic adsorption capacities of toluene on both adsorbents under varying relative humidity levels. HCSC demonstrated superior toluene/water vapor adsorption selectivity. Further analyses of toluene adsorption kinetics, activation energy, and water vapor adsorption isotherms revealed that the lower surface oxygen functional group content of HCSC resulted in a weaker surface polarity, facilitating the adsorption of weakly polar toluene. This was attributed to stronger toluene–HCSC interactions and weaker water–HCSC interactions. The dynamic adsorption capacities of three VOCs with varying polarities were also tested on HCSC. The observed VOC/water vapor adsorption selectivity had the following order: toluene > n-heptane > 1,2-dichloroethane. Grand Canonical Monte Carlo (GCMC) simulations were employed to quantify the relationship between the adsorption selectivity of eight VOCs with varying polarities and their molecular polarity. The results indicated a decrease in adsorption selectivity with increasing VOC polarity. A mechanistic analysis suggests that more polar VOCs prefer to adsorb polar oxygen-containing functional groups, competing with water molecules for adsorption sites. Under high humidity, hydrogen bonding leads to the formation of water clusters, exacerbating this competition. This research holds significant implications for the efficient selective adsorption of VOCs with varying polarities in humid industrial conditions.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2025
·
IF 12.4
Myat Noe Khin,Md Easdani,Tariq Aziz,Ashwag Shami,Nada K. Alharbi,Fahad Al-Asmari,Lin Lin
Gelatin is a versatile biopolymer for bio-packaging, but its poor water resistance and susceptibility to deterioration limit its application. This study addresses these limitations by forming a Schiff's base through crosslinking gelatin with dialdehyde cellulose (DAC) to enhance mechanical properties and water resistance. The crosslinking degree was investigated using the ninhydrin method and, also visually identified through a yellow-brown color formation. Crosslinking increased tensile strength (TS) from 30.2 ± 1.6 MPa to 37.3 ± 3.9 MPa and improved UV barrier properties, with a 30% increase in UV-B and UV-A protection compared to the pure gelatin film. Gallic acid (GA) was incorporated at concentrations ranging from 1% to 5% to improve the antimicrobial properties and shelf life of the film. Films with GA inhibited E. coli and S. aureus and resisted fungal growth on the film for more than 20 months. Furthermore, incorporation of GA further enhanced TS, elongation of break (EBA), barrier and hydrophobic properties of the composite film. The highest tensile strength was achieved with 3% GA (49.4 ± 4.5 MPa). EBA improved with higher GA concentrations, reaching a 44% improvement at 5% GA compared to the non-GA film. Oxygen permeability dropped from 5.7 ± 0.1 to 4.3 ± 0.1 cm 3 /m 2 d 0.1 MPa, and water vapor permeability decreased from 6.7 ± 0.75 × 10 −11 to 4.2 ± 0.07 × 10 −11 g m/m 2 s Pa at 5% GA. Despite these benefits, the films remained vulnerable to high acidic conditions. This study demonstrates that Schiff's base crosslinking of gelatin with DAC, combined with GA, results in durable, antibacterial bio-based packaging films with enhanced strength and barrier properties.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）