Open Physics
·
2021
·Vol. 19
·期 1
·486-493
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IF 1.067
Ting Liang,Biao Wang,Zhenzhong Fan,Qingwang Liu
A facile method for fabricating superhydrophobic and superoleophilic powder with 5A zeolite and stearic acid (SA) is reported in this study. The effect of different contents of SA on contact angle (CA) was investigated. The maximum water CA was 156.2°, corresponding to the optimum SA content of 1.5 wt%. The effects of SA and the mechanism of modified 5A zeolite powder by SA were analyzed by sedimentation analysis experiment, FTIR analysis, particle size analysis, and SEM characterization. The SA-modified 5A zeolite was used as an oil sorbent to separate oil–water mixture with potential use in floating oil. The separation efficiency was above 98%.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 68
·54913-54919
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IF 3.84
Dong Zhang,Huiping Zhang,Ying Yan
To remove lean methane from air, an adsorption process involving a fixed-bed filled with small adsorbents is often used. This process, however, has some drawbacks such as large bed pressure drop and low bed utilization. To overcome these shortcomings, we fabricated 5A zeolite coating/paper-like sintered stainless steel fiber (PSSF) composites by using an in situ hydrothermal method on a 3-aminopropyltrimethoxysilane-functionalized support. The composites have large external surface areas and high voidages. They were further characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and N2 adsorption/desorption. Moreover, we packed these composites at the end of fixed beds to form structured fixed beds and tested adsorption dynamics. We analyzed the breakthrough curves obtained from adsorption dynamics by the length of the unused bed model (LUB). Results showed that the composites were successfully prepared with dense coating. Furthermore, the breakthrough curves of structured fixed beds were steeper than that of the fixed bed. We concluded that by forming structured fixed beds with 5A zeolite coating/PSSF composites, the bed pressure drop could be reduced and the bed utilization could be improved.
研究领域:
化学工程
·
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2017
·Vol. 20
·期 2
·1700745
·
IF 2.319
Nan Sun,Quan-Ping Zhang,Hao-Ran Sun,Wen-Bin Yang,Yuan-Lin Zhou,Jiang-Feng Song,De-Li Luo
5A molecular sieves have been widely used as adsorbents in cryogenic distillation for hydrogen isotope separation in fusion reactor engineering, but its low thermal conductivity is detrimental to the process stability. Improving the thermal conductivity of 5A molecular sieves is one of the most important goals for high-performance devices. Here, firm segregated structures with boron nitride sheets (BNs) are constructed around 5A molecular sieve particles. SEM results show 30 µm BNs tend to form the better networks in comparison with that of 0.12 µm BNs at 40 wt% loadings. It is further verified that BNs with the larger size promote the thermal conductivity. Meanwhile, the thermal conductivity increases with the increasing amounts of BNs. XRD and specific surface area results indicate that the sintering and the addition of BNs exert negligible effects on the structure of 5A molecular sieve. These results indirectly show 5A molecular sieve with BNs segregated structures is very likely to be used for the application of hydrogen isotopic separation. Besides, this work provides new insight into the construction of segregated structure in inorganic porous materials.
研究领域:
材料科学
·
核工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yu Qiao,Yonghou Xiao,Shuohan Yang,Qidong Zhao,Wenkai Zhao,Gaohong He
Recently, the investigation of high-efficiency adsorbents for CO adsorption and separation has gradually become a research focus with carbon energy chemistry developing and environmental protection requirement enhancing. The adsorption performance of CO would be devitalized under a humid environment, although the traditional molecular sieves could serve as an effective adsorbent toward CO adsorption under an anhydrous atmosphere. In this work, a strategy of silanization modification was proposed to enhance the performance of CO adsorption by restraining the surface occupied by competitive water molecules due to the hydrophilic nature of silica hydroxyl groups on the 5A molecular sieves. A series of hydrophobic CO adsorbents (X-B-5A) were successfully prepared via impregnation using butyltrichlorosilane (BTS) as a hydrophobic agent, toluene as a dispersion solution, and commercial 5A molecular sieves as a raw material. The effect of different concentrations of BTS in toluene solution on hydrophobicity and CO adsorption performance was investigated. The results showed that the hydrophobicity of X-B-5A was significantly increased after silanization modification. Additionally, the water contact angle of 0.004-B-5A increased from 20° to 154°, and the static water vapor adsorption capacity was reduced from 27.5 to 6.0% at 35 °C. The CO static adsorption capacity of 0.004-B-5A still reached 1.54 mmol/g, which was only 14.6% lower than that of pristine 5A molecular sieves. Additionally, the dynamic adsorption capacity of CO over the as-prepared X-B-5A was significantly enhanced compared to pristine 5A molecular sieves in the presence of moisture. The as-prepared hydrophobic adsorbents exhibited satisfactory CO adsorption performance and high thermal stability in a humid environment. This work presents a novel strategy for the preparation of adsorbents toward CO adsorption employed under a high relative humidity environment.
研究领域:
材料科学
·
环境化学
·
吸附分离技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Qingrong Zhang,Yingcai Wang,Yuanping Jiang,Yuhui Liu,Yubo Shen,Zhibin Zhang,Yunhai Liu
Recycling waste salt in the dry reprocessing of nuclear fuel and reducing electric energy consumption in the electrorefining process are crucial steps toward addressing significant challenges in this field. The present study proposes a novel approach to purify waste salt by selectively adsorbing excessive fission products using 5A molecular sieves (5A), based on the principles of electrorefining, with the ultimate aim of achieving sustainable development in nuclear fuel. First, Lutetium (Lu)-Bi alloy was synthesized through constant potential electrolysis in the LiCl–KCl–LuCl3 melt, resulting in a 90.59% extraction rate of Lu(III) on the Bi electrode. Subsequently, following the electrolysis process, the waste salt underwent high-temperature adsorption with a 5A for purification. The results of the experiment indicate that the utilization of 5A for adsorption can lead to a remarkable removal efficiency of Lu, reaching an impressive rate of 99.70%. Consequently, when combined with electrolytic reduction, the overall extraction rate of Lu is significantly enhanced to a remarkable 99.98%. Finally, experiments on the coexistence of rare earth elements were conducted, revealing a significant removal rate for Y, Ho, Tm, Yb, and Lu. This study presents innovative solutions for effectively utilizing waste salt in the nuclear fuel cycle.
研究领域:
核化学与核燃料循环
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CLAYS AND CLAY MINERALS
·
2020
·Vol. 68
·期 1
·1-8
·
IF 1.507
Chen Le,Qian Jun-Yan,Yang Chuang,Xu Ping-Ping,Zhu Dan-Dan,Zhong Jing,He Ming-Yang,Chen Qun,Zhang Zhi-Hui
The efficient separation of hexane isomers from the light naphtha fraction is a significant challenge in the petrochemical industry. 5A zeolite adsorbent is used commercially to sieve alkane isomers. In this study, 5A zeolites were synthesized using a low-cost natural clay mineral precursor, i.e. palygorskite (PAL), with the addition of crystallization directing agent (CDA). By varying the mass ratio of CDA/deionized water, 5A zeolites were obtained as CDA-5%, CDA-7.5%, and CDA-10%. All products were submicron particles with an average particle size of 400–800 nm. A sieving test of CDA-induced 5A zeolites was carried out on hexane adsorbates including n -hexane ( n HEX), 2-methylpentane (2MP), and 3-methylpentane (3MP). According to vapor-phase batch adsorption experiments, a significant equilibrium amount (0.149 g/g) of n HEX and only 0.0321 g/g 2MP and 0.0416 g/g 3MP were adsorbed on the 5A zeolite product with CDA-5%. The dynamic adsorption performance of 5A zeolite (CDA-5%) was evaluated by breakthrough curves of binary mixtures of n HEX/2MP and n HEX/3MP. Palygorskite 5A (PAL 5A) zeolite achieved maximum dynamic adsorption capacities of n HEX (0.16 g/g in both cases) at 200°C and 1.2 MPa total pressure. This work provided an economic alternative for the synthesis of 5A zeolites using natural clay minerals instead of chemical raw materials.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
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