We report here a case of an unusual extrahepatic portosystemic venous shunt in a 37-year-old woman without liver cirrhosis or portal hypertension, who developed portal systemic encephalopathy. ...Angiography demonstrated an inferior mesenteric-caval shunt characterized by the presence of direct communication of the inferior mesenteric vein with the left internal iliac vein. After the treatment with percutaneous transcatheter embolization of the shunt via a femoral vein approach using coils, she had no episode of portal systemic encephalopathy. (Internal Medicine 40: 887-890, 2001)
The characteristics of adsorption of 1,1,1,2,2,3,3,4,4-nonafluorobutyl methyl ether (NFE), a chlorofluorocarbon (CFC) replacement, onto six different activated carbon; preparations (three activated ...carbon fibers and three different-sized activated carbon particles) were investigated to evaluate the interaction between activated carbon surfaces and NFE. The amount of NFE adsorbed onto the three activated carbon fibers increased with increasing specific surface area and pore volume. The amount of NFE adsorbed onto the three different-sized-activated carbon particles increased with an increase in the particle diameter of the granular activated carbon. The differential heat of the NFE adsorption onto three activated carbon fibers depended on the porosity structure of the activated carbon fibers. The adsorption rate of NFE was also investigated in order to evaluate the efficiency of NFE recovery by the activated carbon surface. The Sameshima equation was used to obtain the isotherms of NFE adsorption onto the activated carbon fibers and different-sized-activated carbon particles. The rate constant k for NFE adsorption onto activated carbon fibers was larger for increased specific surface area and pore volume. The rate of NFE adsorption on activated carbons of three different particle sizes decreased with increasing particle diameter at a low initial pressure. The adsorption isotherms of NFE for the six activated carbons conformed to the Dubinin–Radushkevich equation; the constants BE0 (the affinity between adsorbate and adsorbent) and W0 (the adsorption capacity) were calculated. These results indicated that the interaction between the activated carbon and NFE was larger with the smaller specific surface area of the activated carbon fibers and with the smaller particle diameter of the different-sized-activated carbon particles. The degree of packing of NFE in the pores of the activated carbon fibers was greater than that in the pores of the granular activated carbons.
The apparent aqueous solubility of the endocrine disruptor in hydroxypropyl-cyclodextrin (HP-CD) solutions was investigated for evaluating the remediation of soil contamination and ground water ...pollution. The apparent solubility of bisphenol A (BPA) in water was significantly increased in HP-CD solutions. The solubilization effect of HP-CD's is caused by the formation of inclusion complexes of BPA and cyclodextrin. The relative aqueous-phase concentration of BPA linearly increased with increasing HP-CD concentration. The solubility of BPA increased in the order of the addition of HP-a-CD, HP-7-CD, and HP-ß-CD. However, it did not depend upon the degree of hydroxypropylation substitution. It is concluded that HP-CD may be utilized for the remediation of soil contamination.
TRIHALOMETHANE REMOVAL BY ACTIVATED CARBON FIBER Nakamura, Takeo; Kawasaki, Naohito; Araki, Mamiko ...
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering,
01/2001, Letnik:
36, Številka:
7
Journal Article
Recenzirano
For the safety of drinking water, trihalomethanes are removed by adsorption onto activated carbon fiber from single-component solutions. The amounts adsorbed onto adsorbents with large surface area ...and/or pore volume were small. Stronger surface hydrophobicity of adsorbent was correlated with a larger amount of trihalomethanes adsorbed. A trihalomethane with bromine was adsorbed to a greater extent than that with chlorine. The differences in the amounts adsorbed among trihalomethanes can be explained by the polarity of trihalomethane molecules. The amount of trihalomethanes adsorbed was mainly dominated by the strength of hydrophobicity of activated carbon fibers.
The amount of chloroform produced from dyes (orange II, methylene blue, and methylrosanilinium chloride) and humic acid by adding chlorine after the ozone treatments was investigated. Some dyes and ...humic acid were degraded by ozone and produced polar and acidic organic compounds. The amount of chloroform produced from orange II increased or decreased with the ozonization time, while that produced from methylene blue and humic acid decreased with ozonization time. Methylrosanilinium chloride did not produce the trihalomethane by chlorine disinfection. Thus, some but not all dyes produce trihalomethanes by ozone treatment and chlorine disinfection.
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