FUEL PROCESSING TECHNOLOGY
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2015
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IF 3.352
Hui-Ying Sun,Lin-Ping Sun,Fei Li,Long Zhang
The adsorption of benzothiophene from fuels on NaY zeolites modified with 0.09 M NaOH aqueous solution was investigated. The sulfur removal reached to 99.9%, and the adsorption capacity was 1.65 mg benzothiophene/g of the modified adsorbent. The results of the scanning electron microscopy, X-ray diffraction, X-ray fluorescence, and N 2 adsorption–desorption isotherms analyses show that mesopores appeared on the surface of NaY-0.09 adsorbent and the intrinsic crystallinity was preserved after the modification. Py-IR and NH 3 -TPD analyses indicated that the adsorption of benzothiophene occurred on the weak Lewis acid sites on the adsorbent. Both an increase in the number of the weak Lewis acid sites and the formation of mesopores on NaY-0.09 adsorbent improved its desulfurization activity.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Mengjiao Yu,Xiong-Fei Zhang,Siting Yang,Jianfeng Yao
Adsorptive desulfurization represents a promising approach for ultra-deep desulfurization. In this work, NaY zeolite was successfully integrated into a biodegradable alginate matrix, forming composite beads that demonstrated improved adsorption capacity and favorable reusability. The composite beads have been utilized as adsorbents for the purpose of removing sulfur compounds (thiophene, TP) from model fuel. At room temperature (25 °C), the optimum 1NaY/CA beads presented a maximum adsorption capacity of 51.4 mgS/g for TP. The superior accessibility of the adsorption sites within the 1NaY/CA beads, primarily attributed to the porous structure of NaY and the abundant functional groups of sodium alginate, contributed to the improved adsorptive desulfurization performance. The adsorption process followed pseudo-second-order kinetics, and the overall process was an exothermic reaction that was spontaneous and feasible. The 1NaY/CA beads demonstrated remarkable stability and reusability, with the efficiency decreasing by a mere 7.2 % after six cycles.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Zhenwei Lu,Keqiang Zhang,Fuyuan Liu,Xingliang Gao,Zhongwei Zhai,Jiajia Li,Lianzhu Du
Currently, the closure of the nutrient circular loop and contaminant removal from wastewater are drawing widespread attention. In this study, a novel MgO/iron oxide-modified NaY zeolite (MNZ) was prepared and used for the integration of adsorption and struvite precipitation to simultaneously reclaim ammonium and phosphate from wastewater. The results proved that MgO and iron oxide nanoparticles were successfully embedded in the zeolite matrix, providing high adsorption performance for ammonium and phosphate, reaching 380.02 (as NH + 4) and 324.68 (as P T ) mg/g, respectively. The presence of NO 3 − , Cl − , SO 4 2− , and HCO 3 − did not significantly influence the adsorption of ammonium and phosphate. Struvite precipitation on the MNZ surface is the primary mechanism for the recovery of both ammonium and phosphate with electrostatic attraction and ion exchange also involved in ammonium uptake. These results indicate that optimized MNZ is promising for nutrient recovery from wastewater because of its high selectivity for targeted absorbates and its potential application as a slow-release eco-fertilizer.
研究领域:
环境工程
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水处理
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材料科学
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废物管理
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2019
·
IF 4.182
Meihua Zhu,Shiming Huang,Yudan Gong,Yunyan Zhou,Xinyu Chen,Yongsheng Liu,Na Hu,Fei Zhang,Xiangshu Chen,Hidetoshi Kita
Good separation performance NaY zeolite membrane was successfully prepared on the tubular mullite support by fluoride-containing precursor synthesis gel. The fluoride source had a great influence on NaY zeolite membrane growth and separation performance for EtOH/ETBE mixture, the NaF containing precursor gel was benefit for preparing high Si/Al ratio, fine reproduction quality and long-term stable NaY zeolite membrane. Solid state 19 F MAS NMR characterization results indicated that the fluorine existed in the channel of NaY zeolite crystals. Both flux and separation factor of the NaY zeolite membrane were greatly depended on the separation temperature and composition of EtOH/ETBE mixtures. The NaY zeolite membrane presented eminent long-term stability for separating 20 wt% EtOH/ETBE mixture at 60 °C, even if the test time was prolonged to 80 h, the flux and separation factor were kept 1.30 kg m −2 h −1 and 1100.
研究领域:
材料科学
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膜分离技术
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化学工程
·
无机非金属材料
·
功能材料
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Meihua Zhu,Xingguo An,Tian Gui,Ting Wu,Yuqin Li,Xiangshu Chen
Pervaporation performance of NaY zeolite membranes is improved by ion-exchange with di-valent nitrate salt . Different nitrate salts, including Co(NO 3 ) 2 , Mg(NO 3 ) 2 , Zn(NO 3 ) 2 , Ca(NO 3 ) 2 , Cu(NO 3 ) 2 , KNO 3 , and AgNO 3 , have great effects on the channel structure and water affinity of the NaY zeolite membrane. When the concentration of nitrate salt, ion-exchange temperature and time are 0.1 mol·L −1 , 50 °C and 2 h, the ion-exchange degree order of NaY zeolites is Ag + > K + > Ca 2+ > Zn 2+ ≫ Co 2+ > Mg 2+ . Especially, Ag + and K + cation exchange degree of NaY zeolites are achieved to 96.54% and 82.77% in this work. BET surface, total pore capacity, pore size distribution and water contact angle of the ion-exchanged NaY zeolites are all disordered by mono- and di-valent cations. Di-valent nitrate salt is favor for increasing the dehydration performance of NaY zeolite membranes by ion-exchange. When the ion-exchange solution is Zn(NO 3 ) 2 , the total flux variation and separation factor variation of the NaY membrane (M-5) are −45% and 230% for separation of 10% (mass) H 2 O/EtOH mixture by pervaporation, and the ion-exchanged membranes showed good reproducibility.
研究领域:
材料科学
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膜分离技术
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无机非金属材料
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化学工程
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纳米材料
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吸附与扩散
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界面化学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
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2024
·
IF 8.1
Yalong Duan,Ruxia Zhang,Pengfei Han,Ngie Hing Wong,Jaka Sunarso,Shaomin Liu,Jiang Yu
This work reports the ion exchange fabrication of maghemite (γ-Fe 2 O 3 ) modified NaY zeolite (Fe 2 O 3 @Y) with bifunction of adsorption and catalysis. The Fe 3+ successfully replaced the Na + in the β cage of zeolite in the ion exchange process and coordinated with framework oxygens to form magnetic γ-Fe 2 O 3 . Therefore, most of the γ-Fe 2 O 3 particles were confined in the β cages, which resulted in the high dispersal and stability of the catalyst. The Fe 2 O 3 @Y could remove methylene blue (MB) model pollutants up to 59.02 and 61.47% through the adsorption and catalysis process, respectively. The hydrogen bond between the OH − ions around the Fe 2 O 3 @Y surface and the N and O presented in the MB molecules enabled the chemical adsorption to MB, which accorded with the pseudo-second-order kinetic model. Further, the H + existed in the solution and the β cage of zeolite promoted the collapse of micro-nano bubbles (MNBs). Then, the γ-Fe 2 O 3 catalyst would be activated by high temperature and oxidated OH − to produce hydroxyl radicals for pollutant degradation . Thus, pollutant removal was attributed to the combined effects of adsorption and catalysis in the Fe 2 O 3 @Y + MNB system. In this work, the Fe 2 O 3 @Y was demonstrated as a potentially magnetic adsorbent or MNB catalyst for wastewater treatment .
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 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）