نتایج جستجو برای: zeolite a

تعداد نتایج: 13436344  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2008
hossein ghasemi mobtaker hossein kazemian mohammad ali namdar ali malekinejad mohammad reza pakzad

the main goal of this study is to investigate the capability of zeolites a and p synthesized from iranian natural clinoptilolite for uranium uptak. the removal of uranium(vi) from aqueous solution via ion exchange by zeolites in a single component system with various contact times,  temperatures and initial concentrations of uranium(vi) was investigated. the experimental results were fitted to ...

Ali Malekinejad Hossein Ghasemi Mobtaker, Hossein Kazemian, Mohammad Ali Namdar Mohammad Reza Pakzad

The main goal of this study is to investigate the capability of zeolites A and P synthesized from Iranian natural clinoptilolite for uranium uptak. The removal of uranium(VI) from aqueous solution via ion exchange by zeolites in a single component system with various contact times,  temperatures and initial concentrations of uranium(VI) was investigated. The experimental results we...

2016
Jing Shi Naiming Zhang Chenguang Zhang Boxian Wei

The activation of soil-fixed phosphorus is a long-term concern in soil science. In order to enhance the activation effect to soil-fixed phosphorus in red soil, different modified zeolite, through physical, chemical method and the associated both physics and chemistry, was used in this paper. The results showed as following: 1) the activated ability to soil-fixed phosphorus in red soil for modif...

2018
Joris Goetze Irina Yarulina Jorge Gascon Freek Kapteijn Bert M. Weckhuysen

In small-pore zeolite catalysts, where the size of the pores is limited by eight-ring windows, aromatic hydrocarbon pool molecules that are formed inside the zeolite during the Methanol-to-Olefins (MTO) process cannot exit the pores and are retained inside the catalyst. Hydrocarbon species whose size is comparable to the size of the zeolite cage can cause the zeolite lattice to expand during th...

2018
A. Medina-Ramírez A. A. Flores-Díaz B. Ruiz Camacho G. García-Ruiz

The synthesis of calcium silicate supported zeolite membrane was carried out by second growth method. The chemical nature of the functionalizing agent on the formation of homogenous zeolite membrane was evaluated. One monomer and two cationic polymers were used: 3-aminopropyltriethoxysilane (APS), polyethylenimine (PEI) and polydiallyldimethylammonium chloride (PDDA). The support was subjected ...

2006
A. Ansari Mahabadi M. A. Hajabbasi H. Khademi H. Kazemian

In recent years, natural substances such as zeolite have been used to absorb heavy metals in soil in an attempt to decrease their availability to plants. Compared to other techniques, the use of zeolite is fast, clean, and inexpensive. This research was carried out to investigate the effects of an Iranian natural zeolite (clinoptilolite) on stabilizing Cd-contaminated soil treated with 0.01 M C...

2011
James Anthony Ippolito David D. Tarkalson Gary A. Lehrsch

Adoption of new management techniques that improve soil water storage and soil N plant availability yet limit N leaching may help improve environmental quality. A benchtop study was conducted to determine the influence of a single urea fertilizer rate (224 kg N ha) applied with band or fully mixed zeolite (clinoptilolite) application rates (up to 90 Mg ha) on NH4-N and NO3-N concentrations in a...

2017
David E. Anderson Srinivasan Balapangu Heidimarie N. A. Fleischer Ruth A. Viade Francis D. Krampa Prosper Kanyong Gordon A. Awandare Elvis K. Tiburu

Temperature-dependent zeolite synthesis has revealed a unique surface morphology, surface area and pore size which influence the immobilization of urease on gold electrode supports for biosensor fabrication. XRD characterization has identified zeolite X (Na) at all crystallization temperatures tested. However, N₂ adsorption and desorption results showed a pore size and pore volume of zeolite X ...

Journal: :Biological & pharmaceutical bulletin 2010
Yong Jae Shin Chang-Soo Han Chang Seok Lee Hong-Sook Kim Seong-Hee Ko Seung Kyun Hwang Seong-Gyu Ko Jong Wook Shin Sang-Kyu Ye Myung-Hee Chung

Zeolite 4A, synthetic silicate, has been shown to exhibit diverse biological activities such as anti-cancer and anti-oxidant activity. In the present study, we report that the zeolite 4A may improve skin-whitening. We found that zeolite 4A inhibited melanin production in a dose-dependent manner, which has not cytotoxicity. Zeolite 4A also inhibited alpha-melanocyte-stimulating hormone (alpha-MS...

Journal: :Journal of the Air & Waste Management Association 2005
Yu-Chih Lin Hsunling Bai Chung-Liang Chang

This study examines the performance of a new adsorbent, hexagonal nanostructured zeolite particles (HNZP) for acetone adsorption and compares the results with that of commercial mobil synthetic zeolite-5 (ZSM-5) type zeolite. The HNZP is a pure siliceous adsorbent with different values of pore diameter and surface area being adjustable by the manufacturing condition. The results indicate that a...

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