Photocatalytic degradation of carbamazepine and three derivatives using TiO2 and ZnO: Effect of pH, ionic strength, and natural organic matter

2014 ◽  
Vol 475 ◽  
pp. 16-22 ◽  
Author(s):  
Lounes Haroune ◽  
Maria Salaun ◽  
Alain Ménard ◽  
Claude Y. Legault ◽  
Jean-Philippe Bellenger
Keyword(s):  
Organic Matter ◽  
Ionic Strength ◽  
Photocatalytic Degradation ◽  
Natural Organic Matter ◽  
Effect Of Ph

Decolorisation of natural organic matter by Phanerochaete chrysosporium: the effect of environmental conditions

2004 ◽  
Vol 4 (4) ◽  
pp. 175-182 ◽  
Author(s):  
K. Rojek ◽  
F.A. Roddick ◽  
A. Parkinson
Keyword(s):  
Organic Matter ◽  
Ionic Strength ◽  
Natural Organic Matter ◽  
Phanerochaete Chrysosporium ◽  
Fungal Growth ◽  
Low Ph ◽  
Colour Removal ◽  
Humic Material ◽  
Carbon And Nitrogen ◽  
Carbon And Nitrogen Content

Phanerochaete chrysosporium was shown to rapidly decolorise a solution of natural organic matter (NOM). The effect of various parameters such as carbon and nitrogen content, pH, ionic strength, NOM concentration and addition of Mn2+ on the colour removal process was investigated. The rapid decolorisation was related to fungal growth and biosorption rather than biodegradation as neither carbon nor nitrogen limitation, nor Mn2+ addition, triggered the decolorisation process. Low pH (pH 3) and increased ionic strength (up to 50 g L‒1 added NaCl) led to greater specific removal (NOM/unit biomass), probably due to increased electrostatic bonding between the humic material and the biomass. Adsorption of NOM with viable and inactivated (autoclaved or by sodium azide) fungal pellets occurred within 24 hours and the colour removal depended on the viability, method of inactivation and pH. Colour removal by viable pellets was higher under the same conditions, and this, combined with desorption data, confirmed that fungal metabolic activity was important in the decolorisation process. Overall, removals of up to 40–50% NOM from solution were obtained. Of this, removal by adsorption was estimated as 60–70%, half of which was physicochemical, the other half metabolically-dependent biosorption and bioaccumulation. The remainder was considered to be removed by biodegradation, although some of this may be ascribed to bioaccumulation and metabolically-dependent biosorption.

Transport characterizations of natural organic matter in ion-exchange membrane for water treatment

2002 ◽  
Vol 2 (5-6) ◽  
pp. 445-450 ◽  
Author(s):  
D.H. Kim ◽  
S.-H. Moon ◽  
J. Cho
Keyword(s):  
Organic Matter ◽  
Ionic Strength ◽  
Ion Exchange ◽  
Natural Organic Matter ◽  
Membrane Surface ◽  
Factors Affecting ◽  
Organic Fouling ◽  
Adsorbed Mass ◽  
Pass Through ◽  
Exchange Membrane

A series of adsorption experiments were performed to investigate the factors affecting the transport of natural organic matter (NOM) in an ion-exchange (IX) membrane. In this study, the structure of the NOM was hypothesized to be an important factor in terms of the organic fouling of IX membrane. It was found that the adsorbed mass of hydrophobic NOM constituent on the membrane surface was higher than that of either the hydrophilic or transphilic NOM constituent. NOM adsorption was seriously affected by the apparent charge of the NOM. As the apparent charge increased, NOM adsorption also significantly increased. Moreover, the molecular mass of the hydrophobic NOM acids was too high to enable them to pass through the IX membrane, and this caused an accumulated adsorption of solutes on the membrane surface, i.e. NOM fouling. In addition, both pH and ionic strength affected NOM adsorption on the surface of the IX membrane. Lower NOM adsorption resulted from a lower pH and a higher ionic strength.

Ozone-enhanced photocatalytic degradation of natural organic matter in water

2006 ◽  
Vol 6 (3) ◽  
pp. 53-61 ◽  
Author(s):  
P. Zhang ◽  
L. Jian
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Photocatalytic Degradation ◽  
Natural Organic Matter ◽  
Retention Time ◽  
Degradation Rate ◽  
Removal Rate ◽  
Water Source ◽  
Drinking Water Source ◽  
Toc Removal

Ozone-enhanced photocatalytic degradation of macromolecular natural organic matter (NOM) in drinking water source was investigated. The influences of ozone dosage, retention time and bicarbonate concentration on the NOM degradation rate were studied. The change of molecular weight distribution of NOM caused by ozone-enhanced photocatalysis was analysed, as well as the degradation rate of NOM with different molecular weight (MW). It was shown that ozone-enhanced photocatalysis was much better for NOM degradation than sole ozonation or photocatalysis. Increase of both ozone dosage and retention time could effectively increase the TOC removal rate, while biodegradability could be improved solely by an increase in ozone dosage. The existence of bicarbonate significantly reduced the photocatalytic degradation rate of NOM; however, its impact was effectively offset by the addition of ozone into the photocatalytic process. Macromolecular NOM was transformed into smaller molecules, and the larger NOM was mineralized by ozone-enhanced photocatalysis much faster than the smaller NOM.

Photocatalytic degradation of humic acid using a novel photocatalyst: Ce-doped ZnO

2017 ◽  
Vol 16 (1) ◽  
pp. 24-30 ◽  
Author(s):  
N. C. Birben ◽  
M. C. Paganini ◽  
P. Calza ◽  
M. Bekbolet
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Photocatalytic Degradation ◽  
Natural Organic Matter ◽  
Novel Material ◽  
Doped Zno

This study aimed at investigating the photocatalytic degradation of humic acid (HA) as a representative of natural organic matter (NOM) by using Ce-doped ZnO as a novel material.

Impacts of Morphology, Natural Organic Matter, Cations, and Ionic Strength on Sulfidation of Silver Nanowires

2016 ◽  
Vol 50 (24) ◽  
pp. 13283-13290 ◽  
Author(s):  
Yinqing Zhang ◽  
Junchao Xia ◽  
Yongliang Liu ◽  
Liwen Qiang ◽  
Lingyan Zhu
Keyword(s):  
Organic Matter ◽  
Ionic Strength ◽  
Natural Organic Matter ◽  
Silver Nanowires
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