HPLC of aminoacids on silica coated with ammonium tungstophosphate

1987 ◽  
Vol 23 (11) ◽  
pp. 814-817
Author(s):  
L. Lepri ◽  
P. G. Desideri ◽  
L. Merlini ◽  
L. Checchini
Keyword(s):  
Ammonium Tungstophosphate

Oxidative Bromination Reaction of Phenol Catalyzed by Ammonium Tungstophosphate Catalyst Supported on Silica

2012 ◽  
Vol 29 (2) ◽  
pp. 135
Author(s):  
Junhong DING ◽  
Shuwen GONG ◽  
Lijun LIU ◽  
Kaozhen LI ◽  
Qingxin CUI
Keyword(s):  
Bromination Reaction ◽  
Oxidative Bromination ◽  
Ammonium Tungstophosphate

SELECTIVE UPTAKE OF CESIUM BY AMMONIUM TUNGSTOPHOSPHATE (AWP) - CALCIUM ALGINATE COMPOSITES

2000 ◽  
Vol 18 (5) ◽  
pp. 1015-1027 ◽  
Author(s):  
Hitoshi MIMURA ◽  
Mikio SAITO ◽  
Kenichi AKIBA ◽  
Yoshio ONODERA
Keyword(s):  
Calcium Alginate ◽  
Selective Uptake ◽  
Ammonium Tungstophosphate

Chromatographic behaviour of small peptides on layers of ammonium tungstophosphate

1982 ◽  
Vol 243 (2) ◽  
pp. 339-346 ◽  
Author(s):  
L. Lepri ◽  
P.G. Desideri ◽  
D. Heimler
Keyword(s):  
Small Peptides ◽  
Chromatographic Behaviour ◽  
Ammonium Tungstophosphate

Efficient Immobilization of Ammonium Tungstophosphate at the Mesoporous Silica Support for the Removal of Cs Ion

2015 ◽  
Vol 15 (9) ◽  
pp. 7211-7220 ◽  
Author(s):  
Younjin Park ◽  
Won Sik Shin ◽  
Sang-June Choi
Keyword(s):  
Mesoporous Silica ◽  
Silica Support ◽  
Ammonium Tungstophosphate

Study on adsorption behavior of cesium using ammonium tungstophosphate (AWP)-calcium alginate microcapsules

2012 ◽  
Vol 55 (9) ◽  
pp. 1719-1725 ◽  
Author(s):  
Yan Wu ◽  
Hitoshi Mimura ◽  
Yuichi Niibori ◽  
Takashi Ohnishi ◽  
Shinichi Koyama ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Adsorption Behavior ◽  
Ammonium Tungstophosphate

Selective Separation and Recovery of Cesium by Ammonium Tungstophosphate-Alginate Microcapsules

2010 ◽  
Author(s):  
Hitoshi Mimura ◽  
Yan Wu ◽  
Yufei Wang ◽  
Yuichi Niibori ◽  
Isao Yamagishi ◽  
...  
Keyword(s):  
Flow Rate ◽  
High Selectivity ◽  
Liquid Waste ◽  
Selective Separation ◽  
High Level Liquid Waste ◽  
Kd Values ◽  
High Level ◽  
Alginate Matrices ◽  
Ammonium Tungstophosphate

A fine crystalline ammonium tungstophosphate (AWP) exchanger with high selectivity toward Cs+ was encapsulated in biopolymer matrices (calcium alginate, CaALG). The characterization of the AWP-CaALG microcapsule was examined using SEM/WDS, IR and DTA/TG analyses, and the selective separation and recovery of 137Cs were examined by the batch and column methods using simulated and real high-level liquid waste (HLLW). The free energy (ΔG0) of the ion exchange (NH4+ ↔ Cs+) for fine AWP crystals was determined at −13.2 kJ/mol, indicating the high selectivity of AWP towards Cs+. Spherical and elastic AWP-CaALG microcapsules (∼700 μm in diameter) were obtained and fine AWP crystals were uniformly immobilized in alginate matrices. Relatively large Kd values of Cs+ above 105 cm3/g were obtained in the presence of 10−3∼1 M Ca(NO3)2, resulting in a separation factor of Cs/Rb exceeding 102. The irradiated samples (60Co, 17.6 kGy) also exhibited large Kd values exceeding 105 cm3/g in the presence of 2.5 M HNO3. The Kd values in the presence of 0.1–9 M HNO3 for 67 elements were determined and the order of Kd value was Cs+ ≫ Rb+ > Ag+. The breakthrough curve of Cs+ had an S-shaped profile, and the breakpoint increased with decreasing flow rate; the breakpoint and breakthrough capacity at a flow rate of 0.35 cm3/min for the column (0.7 g AWP-CaALG) were estimated at 25.2 cm3 and 0.068 mmol/g, respectively. Good breakthrough and elution properties were retained even after thrice-repeated runs. The uptake (%) of Cs+ in simulated HLLW (28 metal components-1.92 M HNO3, SW-11, JAEA) was estimated at 97%, and the distribution of Cs+ and Zr/Ru into the AWP and alginate phases, respectively, were observed by WDS analysis. Further, the selective uptake of 137Cs exceeding 99% was confirmed by using real HLLW (FBR “JOYO”, JAEA). The AWP-CaALG microcapsules are thus effective for the selective separation and recovery of Cs+ from HLLWs.

Preparation of Ammonium Tungstophosphate-Calcium Alginate Composite Adsorbent and its Adsorption Properties of Rubidium

2013 ◽  
Vol 652-654 ◽  
pp. 2524-2528 ◽  
Author(s):  
Xian Jiang Huang ◽  
Lian Ying An ◽  
Xian Yin Zhao ◽  
Xiao Qing Chen
Keyword(s):  
Calcium Alginate ◽  
Concentration Ratio ◽  
Adsorption Equilibrium ◽  
Adsorption Properties ◽  
Separation Coefficient ◽  
Adsorption Ability ◽  
Composite Adsorbent ◽  
Adsorption Time ◽  
Ft Ir ◽  
Ammonium Tungstophosphate

A spherical composite adsorbent AWP-CaALG was prepared by the calcium alginate(CaALG) and ammonium tungstophosphate(AWP). The composite adsorbent was characterized by XRD, FT-IR and TG-DTG-DTA, it proves that the crystal structure of AWP isn’t destroyed and the adsorption ability of the composite adsorbent can be retained up to 120°C. Effects of adsorbent dosage, adsorption time, pH, temperature, concentration of Rb and K were investigated. The results show that the adsorption capacity of composite adsorbent to rubidium is 20.64mg/g.The adsorption equilibrium is gained after 24h. When the concentration ratio of K to Rb is 16, the adsorption rate of Rb can still be up to 94.1% and the Rb/K separation coefficient is 86.

High-performance thin-layer chromatography of 2,4-dinitrophenyl-amino acids on layers of RP-a8, RP-18 and ammonium tungstophosphate

1982 ◽  
Vol 235 (2) ◽  
pp. 411-416 ◽  
Author(s):  
Luciano Lepri ◽  
Pier Giorgio Desideri ◽  
Daniela Heimler
Keyword(s):  
Amino Acids ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
High Performance ◽  
Layer Chromatography ◽  
Ammonium Tungstophosphate
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