Preparation and oxygen storage of cadmium-modified zeolites with superior electron transfer capacities

RSC Advances ◽  
2015 ◽  
Vol 5 (95) ◽  
pp. 77490-77494 ◽  
Author(s):  
Jing-Feng Wang ◽  
Dan Wang ◽  
Hui Zeng ◽  
Zhong-Fu Zhou
Keyword(s):  
Electron Transfer ◽  
Oxygen Storage ◽  
Modified Zeolite ◽  
Modified Zeolites ◽  
Storage Property ◽  
Electron Transfer Capacities

An electron-rich cadmium-modified zeolite prepared by the incorporation of cadmium vapor into the channels of a dehydrodrated HZSM-5, shows superior oxygen storage property.

scholarly journals Fluoride ion adsorption from wastewater using magnesium(II), aluminum(III) and titanium(IV) modified natural zeolite: kinetics, thermodynamics, and mechanistic aspects of adsorption

2017 ◽  
Vol 8 (4) ◽  
pp. 479-489 ◽  
Author(s):  
Zhijun Ma ◽  
Qi Zhang ◽  
Xingyuan Weng ◽  
Changye Mang ◽  
Liwei Si ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Adsorption Process ◽  
Fluoride Ion ◽  
Ion Adsorption ◽  
Order Model ◽  
Fluoride Ions ◽  
Modified Zeolite ◽  
Fluoride Adsorption ◽  
Pseudo Second Order ◽  
Modified Zeolites

Abstract Natural zeolite was modified using metal ions, including magnesium(II), aluminum(III) and titanium(IV). The modified zeolite was then used as an adsorbent for the investigation of the adsorption kinetics, isotherms, and thermodynamic parameters of fluoride ions in wastewater at various pHs and temperatures. The kinetics and thermodynamics for the removal of the fluoride ions onto the modified zeolite have also been investigated. The fluoride ion adsorption capacity of the three types of modified zeolites exhibited an increase, then decrease, with rising pH. The fluoride adsorption capacity of the modified zeolites decreased with an increase in temperature. The pseudo-second-order model is more suitable for describing the adsorption kinetic data than the pseudo-first-order model for modified zeolite and the adsorption process of the fluoride ions reveals pseudo-second-order kinetic behavior, respectively. It was found that the adsorption equilibrium data fit the Freundlich isothermal equation better than that of the Langmuir isothermal and Dubinin–Radushkevich (D–R) isothermal equations. Thermodynamic analysis suggests that the negative values of ΔG0 and ΔH0 further indicate that the fluoride adsorption process is both spontaneous and exothermic. The results of competitive adsorption tests suggest that the modified metal zeolite materials adsorb fluoride ions with high selectivity.

Structure of Ce1−xSnxO2 and its relation to oxygen storage property from first-principles analysis

2010 ◽  
Vol 132 (19) ◽  
pp. 194702 ◽  
Author(s):  
Asha Gupta ◽  
Anil Kumar ◽  
M. S. Hegde ◽  
U. V. Waghmare
Keyword(s):  
First Principles ◽  
Oxygen Storage ◽  
Storage Property

Witch Hazel (Hamamelis virginiana) Fractions and the Importance of Gallate MoietiesElectron Transfer Capacities in Their Antitumoral Properties

2008 ◽  
Vol 56 (24) ◽  
pp. 11675-11682 ◽  
Author(s):  
Daneida Lizárraga ◽  
Sonia Touriño ◽  
Fernando J. Reyes-Zurita ◽  
Theo M. de Kok ◽  
Joost H. van Delft ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Witch Hazel ◽  
Electron Transfer Capacities

Shape-Selective Alkylation of Toluene with Propylene over Modified Zeolite

2011 ◽  
Vol 396-398 ◽  
pp. 739-744
Author(s):  
Jun He ◽  
Jing Zhang ◽  
Jun Hui Li ◽  
Zhi Rong Zhu
Keyword(s):  
Catalytic Performance ◽  
Reaction Conditions ◽  
Modified Zeolite ◽  
Metallic Oxides ◽  
Β Zeolite ◽  
Shape Selective ◽  
Modified Zeolites ◽  
Selective Alkylation

The shape-selective alkylation of toluene with propylene to produce p-cymene (p-isopropyltoluene) was investigated over parent zeolites and modified zeolites. The catalytic performance was compared over ZSM-5, MOR, SAPO-11, MCM-22 and β zeolite. And, their selectivity was improved by loading of metallic oxides over zeolites, and modified β zeolite showed the highest conversion of toluene and the highest selectivity of p-cymene. Moreover, the reaction conditions were optimized over the modified β zeolite.

Ultra-small gold nanoclusters assembled on plasma polymer-modified zeolites: a multifunctional nanohybrid with anti-haemorrhagic and anti-inflammatory properties

Nanoscale ◽  
2021 ◽  
Author(s):  
Laura E González García ◽  
Neethu Ninan ◽  
Johanna Simon ◽  
Rahul Madathiparambil Madathiparambil Visalakshan ◽  
Satriyo Krido Wahono ◽  
...  
Keyword(s):  
Gold Nanoclusters ◽  
Nanocomposite Material ◽  
Plasma Polymer ◽  
Hybrid Nanocomposite ◽  
Modified Zeolite ◽  
Hemostatic Agents ◽  
Zeolite 13X ◽  
Traumatic Bleeding ◽  
Modified Zeolites ◽  
Anti Inflammatory

Hemostatic agents are pivotal for managing clinical and traumatic bleeding during emergency and domestic circumstances. Herein, a novel functional hybrid nanocomposite material consisting of plasma polymer-modified zeolite 13X and ultra-small...

3D structured Mn2O3 synthesized using tween surfactant: influence on the morphology and oxygen reduction catalytic performance

CrystEngComm ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 420-429 ◽  
Author(s):  
Yuan Fang ◽  
Yonghui Wang ◽  
Fen Wang ◽  
Jianfeng Zhu
Keyword(s):  
Electron Transfer ◽  
Oxygen Reduction ◽  
Transfer Rate ◽  
Oxygen Vacancies ◽  
Tween 80 ◽  
Catalytic Performance ◽  
Oxygen Storage ◽  
Electron Transfer Rate

Tween-80 affects the oxygen vacancies of Mn2O3, boosting its oxygen storage capability and electron transfer rate for ORR.

Effect of natural and modified zeolite addition on anaerobic digestion of piggery waste

2003 ◽  
Vol 48 (6) ◽  
pp. 263-269 ◽  
Author(s):  
Z. Milán ◽  
P. Villa ◽  
E. Sánchez ◽  
S. Montalvo ◽  
R. Borja ◽  
...  
Keyword(s):  
Natural Zeolite ◽  
Organic Load ◽  
Second Phase ◽  
Modified Zeolite ◽  
Waste Solid ◽  
Modified Zeolites ◽  
Two Phases ◽  
Gas Volume ◽  
Potential Biodegradability

The effect of natural and modified zeolites on the anaerobic degradation of acetate and methanol was evaluated by the determination of specific methane productivity (SMP) in batch minidigesters of 50 mL at doses of 0.01, 0.05 and 0.1 g of zeolite/g of VSS. The effects of the different zeolite concentrations were determined by the results of the SMP. A kinetic characterization with data of accumulated methane gas volume was also carried out. In the second phase of the study, the effects of natural and nickel zeolite concentrations were tested with piggery waste in laboratory scale digesters of 2.5 L operating at semi continuous mode, by increasing the organic load applied from 0.2 to 22.0 g TCOD/d corresponding to organic loading rates (OLR) of 0.1-8.8 g TCOD/l.d. A greater effect of modified zeolite on SMP was observed, with an increase of 8.5 times with magnesium zeolite, 4.4 times with cobalt zeolite and 2.8 times with nickel zeolite. Two phases were defined in the kinetic study and an increase of more than 2 times the apparent constant of digesters with modified zeolites was observed in the second phase when compared to unmodified natural zeolite. Modified natural zeolite addition to digesters can allow an increase in the potential biodegradability of piggery waste solid fraction and/or a considerable reduction of digestion volume.

scholarly journals Effect of the coexistence of SO32− and PO43− on the adsorption performance of zeolite-loaded FeOOH@ZnO for S2−

2021 ◽  
Author(s):  
Fen Li ◽  
Youjing Li ◽  
Baocai Ge ◽  
Jinguang Hu ◽  
Cailian Yu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Hydrothermal Method ◽  
Significant Influence ◽  
Removal Rate ◽  
Adsorption Properties ◽  
Adsorption Rate ◽  
Modified Zeolite ◽  
Adsorption Performance ◽  
Modified Zeolites

Abstract The present study deals with the synthesis of zeolite-loaded FeOOH@ZnO by hydrothermal method and investigates the effects of coexisting SO32− and PO43− ions in the aqueous solution on the adsorption performance for S2−. The results showed that the HNO3-modified zeolite loaded with FeOOH@ZnO (FeOOH@ZnO/HZ) resulted in a maximum S2− removal rate of ≈98%. The adsorbent's performance on removing S2− was significantly enhanced, compared with NaOH and ZnCl2-modified zeolites loaded with FeOOH@ZnO, and the adsorption was proved to be a heat-absorbing process. When SO32− and PO43− coexisted with S2−, SO32− and PO43− had a significant influence on the adsorption properties of FeOOH@ZnO/HZ. When three ions of S2−, SO32− and PO43− were present simultaneously, the adsorption performance of FeOOH@ZnO/HZ on S2− was further, and the removal rate dropped to about 80%. Moreover, FeOOH@ZnO/HZ also adsorbed PO43− and SO32− in the system containing multiple ions, but the adsorption rate of PO43− and SO32− were much lower than S2−. This indicated that the adsorption of S2− in the presence of FeOOH@ZnO/HZ dominates under competitive conditions.

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