Journal of Energy Storage
·
2022
·
IF 8.907
Wenjuan Qiu,Yu Bai,Yutang Fang,Shuangfeng Wang
Potassium aluminum sulfate dodecahydrate (Alum) and ammonium aluminum sulfate dodecahydrate (AAS) are two potential inorganic phase change materials with high transformation enthalpy. To make them more flexible to match temperature requirements of various fields, the melting temperature needs to be manipulated but less effect on latent heat. In this work, two novel eutectic mixtures of Alum-E and AAS-E were obtained by adding erythritol (E) with high latent heat into aluminum sulfate salts. The results denoted that the melting temperatures of the two eutectic mixtures were 72.46 °C and 73.20 °C when containing 35 wt% and 37 wt% erythritol, respectively. It was worth noting that they still possessed high latent heat of 243.4 J/g and 257.4 J/g. Considering the stability of NH 4 + at high temperature, Alum-E was chosen to fabricate Alum-E/EG (expanded graphite) composite material with high thermal conductivity via melt-blending method. EG not only increased the thermal conductivity from 0.61 W/(m·K) to 10.95 W/(m·K) as an excellent enhanced heat transfer carrier, but also prevented leakage of Alum-E/EG composite material effectively as a porous adsorption carrier when contained 15 wt% EG. Moreover, the thermal stability tests indicated that Alum-E possessed favorable thermal stability after 250 heat-cooling cycles. Above all, the obtained composite energy storage material is a promising candidate for afterheat recovery and medium and low-temperature energy storage areas else.
研究领域:
材料科学
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热能工程
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 1
·51422
·
IF 3.125
Fa Mao,Xuelai Zhang,Yongyichuan Zhang,Biao Liu,Lingyu Zheng
The main objective of this research is to characterize, via experimental analysis, the effects of thickeners on thermophysical properties of Alum (KAl[SO 4 ] 2 ·12H 2 O) as phase change material (PCM) for energy storage. Six thickeners, including sodium carboxymethyl cellulose (CMC-Na), sodium polyacrylate (PAAS), polyacrylamide (PAM), polyvinyl alcohol, xanthan gum (XG) and methylcellulose (MC), are added in Alum. Then the thermophysical properties and the cycle stability are tested and analyzed by step cooling experiment, differential scanning calorimeter, hot disk, scanning electron microscopy, high-low temperature alternating test chamber, X-ray diffraction (XRD), and Fourier transform infrared spectrometer (FT-IR). The results showed that the adding of 2 wt% CMC-Na, 1 wt% PAAS, 2 wt% PAM, 5 wt% XG, and 1 wt% MC to Alum can effectively reduce the subcooling of Alum while still maintaining the latent heat at a high level. After stability test with 60 melting-solidification cycles, the results indicate that Alum with 1 wt% MC has the best thermal cycle stability and has the highest latent heat (230 J/g). The latent heat is only 8.1% lower than that of pure Alum after 1 cycle, and 11.1% higher than that of pure Alum after 60 cycles. The XRD, FT-IR, and thermogravimetry results show that it has good chemical and thermal stability.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2025
·
IF 5.3
Yanfei Fan,Dandan Gao,Dongdong Li,Dewen Zeng
Alum is an important intermediate for the extraction and purification of Cs or Rb chemicals, due to its excellent separation ability for Cs, Rb and K. Although the solubility sequence K-alum > Rb-alum > Cs-alum has been well known, the separation factors among Cs, Rb and K during the formation of alum have not been determined. The formation of solid solution of alum controls the Cs or Rb content and Cs/Rb/K ratio in the sequentially precipitated Cs, Rb and K alums. In this study, the thermodynamic equilibrium separation factors were determined from the solid solution-aqueous solution equilibrium data of the two mixed alum systems: (i) RbAl(SO 4 ) 2 , CsAl(SO 4 ) 2 , and H 2 O, and (ii) KAl(SO 4 ) 2 , RbAl(SO 4 ) 2 and H 2 O. The separation factor β Cs/Rb varied from 48 to 2 with the increase of the Rb/Cs ratio in system (i), and β Rb/K varied from 22 to 0.2 with the increase of the K/Rb ratio in system (ii). This suggests that the purification of Cs or Rb using alums is more efficient from raw materials containing high Cs/Rb or Rb/K ratio than that from low Cs/Rb or Rb/K ratio. In kinetic studies, the apparent separation factors β Cs/Rb and β Rb/K were highly affected by the recrystallization process of cooling or non-cooling and the initial composition of raw alum, showing asymmetric kinetic intensification. The separation factors β Cs/Rb or β Rb/K obtained in the “dissolution by heating and crystallization by cooling (DHCC)” process for the raw alum with high initial Cs/Rb or Rb/K molar ratio is several times larger than the equilibrium value expected from thermodynamics. Finally, CsAl(SO 4 ) 2 and RbAl(SO 4 ) 2 with a metal-based purity of 99.97 % and 99.94 %, respectively, were obtained by using the DHCC process 3–4 times.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2019
·
IF 1.914
Ai-hong Guan,Yong-yang Chao
In this paper, the Terahertz time-domain spectroscopy (THz-TDS) technique was used to quantitatively analyze the alum proportion in sweet potato starch . Terahertz time-domain spectra and frequency-domain spectra of pure sweet potato starch and pure alum and their mixtures were obtained. The absorption coefficient spectrum and refractive index spectrum of the samples were calculated. Results show that alum exhibit unique absorption peaks in the terahertz range, and can thus be identified with its absorption fingerprints in the detection from Sweet potato starch. Differences in the refractive index can also be observed between the alum and the sweet potato starch. The Partial Least Squares (PLS) and the Support vector machine (SVM) algorithm were used to establish the mathematical model between the absorption coefficient and the proportion. Results show that the prediction accuracy can reach 99.8% and 99.9%. Comparing the two predictive models, SVM has a better prediction effect. In all, the THz-TDS system plus SVM method is very promising for the further quantitative analysis of alum in sweet potato starch, with the characteristics of being nondestructive and laborsaving compared to other analytical tools.
研究领域:
食品科学
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光谱学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 37
·期 3
·411-418
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IF 1.063
Huang Libing,Liu Yueqi,Sang Xinyu,Song Jinghui,Hu Ping,Liu Yong
T he alum-borneol nanoemulsion(ABN), which combines the mineral medicine alum and the botanical medicine borneol, has been applied for approximately 40 years in the clinical treatment of burns, scalds, radiation dermatitis and shingles, and has a good curative effect. However, the current formula and dosage form of ABN pose problems of low borneol content and ease of precipitation, which greatly affects the efficacy of the drug. In this study, polyvinylpyrrolidone(PVP) was selected as a carrier mixed with different proportions of alum and borneol to produce alum-borneol-PVP fibers(ABPF) by electrospinning. The results showed that the stable system with good drug dispersion was 2:3(alum:borneol). The dissolution content of borneol from the ABPF was about 80% in 4 h, which was much higher than that of the alum-borneol liquid(ABL) and ABN. The ABPF membrane showed a more significant inhibitory effect on Staphylococcus aureus than the ABL and ABN. The composite fiber markedly increased the drug content of borneol, which was 800 times of that in ABN. The fiber had a higher solubility than the nanoemulsion in vitro , which is of great importance for the development of new forms for the clinical application of alum and borneol.
研究领域:
药剂学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2022
·Vol. 31
·期 3
·1129-1143
·
IF 4.705
Tang Qi,Qiu Chongpeng,Zhang You,Zhang Xuefeng,Yuan Zihui,Tan Hailu,Wang Lei,de Hoop Cornelis F.,Qi Jinqiu,Huang Xingyan
In this work, a novel nanocellulose/alum/chitosan/polyethyleneimine biohybrid aerogel (NACPBA) beads adsorbent was successfully prepared to remove diclofenac sodium (DS) from wastewater. The NACPBA beads adsorbent was characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffractometer, and Brunauer–Emmett–Teller. A possible adsorption mechanism was also discussed. The experimental results showed that the adsorption process was followed by a pseudo-second-order kinetic model and Sips isotherm model with the calculated maximum adsorption capacity of 321.3 mg/g on DS. It was much higher than most of the previously reported works. The adsorption capacity of NACPBA beads on DS was increased rapidly within 120 min, especially in the first 60 min. Furthermore, after five regeneration cycles, NACPBA still retained a good adsorption capacity of 103.7 mg/g with a removal efficiency of 50%. Moreover, 95.4% of DS was removed from river water (simulated 5 mg/L DS-contaminated wastewater). The possible adsorption mechanism was primarily governed by electrostatic attractions and hydrogen bond interactions.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lei Xu,Shian Song,Nigel J.D. Graham,Wenzheng Yu
Till now, the transformation of amorphous flocs formed during the hydrolysis stage of coagulation has not been fully addressed. In this work, by using a conventional coagulant (alum), the transformation process was explored by observing the interactions between O 3 and the amorphous alum flocs formed during flocculation at neutral pH. It was found that O 3 promoted the transition of the in-situ formed alum flocs from tetrahedral Al (Al(O) 4 ) to octahedral Al (Al(O) 6 ) structures, through an accelerated dehydroxylation process, and therefore facilitated the crystallization process to form boehmite . During this process, the surface functional groups of amorphous Al flocs ( Al–H 2 O and Al–OH) were observed to take part in the O 3 catalytic oxidation with the generation of hydroxyl radicals ( OH). This synergistic effect significantly favored the performance of the subsequent dual-membrane (UF-NF) process in terms of both fouling alleviation (1.78 and 1.60 times higher flux of UF and NF , respectively) and final effluent quality improvement, including the reduction in disinfection byproduct (DBP) formation potential (48.1% and 22.4% lower generation of total trihalomethanes and total haloacetic acid, respectively) and the corresponding calculated toxicity. The results obtained here provide a greater understanding of the transformation of amorphous Al flocs formed during flocculation with O 3 , and valuable information regarding its practical application in membrane filtration process with greater treatment performance.
研究领域:
环境工程
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水处理
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
BIOMEDICINE & PHARMACOTHERAPY
·
2019
·
IF 3.743
Yanke Lin,Shuai Wang,Zemin Yang,Lu Gao,Ziyue Zhou,Pei Yu,Baojian Wu
Bilirubin is an endogenous substance derived from heme catabolism. In this study, we aimed to assess the anti-inflammatory activity of bilirubin, and to determine the mechanism thereof. The anti-inflammatory activity of bilirubin was evaluated using lipopolysaccharide (LPS)-treated peritoneal macrophages (PMs) and Raw264.7 cells, and mice with alum-induced peritonitis. The mRNA and proteins of NOD-like receptor family pyrin domain containing 3 (Nlrp3) and inflammatory cytokines were determined using qPCR and Western blotting, respectively. Distribution of phosphorylated (p) p65 [a NF-κB (nuclear factor-κB) subunit] in the cytoplasm and nucleus were evaluated by immunofluorescence analysis and electrophoretic mobility shift assay. Bilirubin prior to LPS treatment decreased protein expressions of Nlrp3, pro-interleukin (IL)-1β and mature IL-1β in PMs, whereas bilirubin post LPS treatment showed no effects. Bilirubin prior to LPS treatment dose-dependently repressed expressions of Nlrp3 and IL-1β, and inhibited translocation of p-p65 to nucleus in Raw264.7 cells. Bilirubin treatment decreased myeloperoxidase activity and reduced the levels of inflammatory cytokines (i.e., IL-1β, TNFα and IL-6) in lavage fluid in mice with alum-induced peritonitis. This was accompanied by a lower mortality rate. In addition, the mRNAs of Nlr p3 and IL-1β in peritoneal exudates cells were decreased, and the levels of p-p65 and mature IL-1β proteins were reduced. In conclusion, bilirubin acted on inflammation and alleviated alum–induced peritonitis through inactivation of Nlrp3 inflammasome.
研究领域:
免疫学
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炎症
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药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）