Degradation efficiency

Wang, H Xie, C Zhang, W Cai, S Yang, Z. and Gui, Y. (2007) Comparison of dye degradation efficiency using ZnO powders with various size scales. Journal of Hazardous materials, 141, 645—652. 

Table 4. Degradation efficiency of RB137 model solution (20 mgL ) by Fe"/H202, Fe /H202/NH4ZSM5 and UV/Fe /H202 processes...

Figure 12. RB137 (20 mgL ) decolorization and mineralization efficiency as well as changes of pFI values during the treatment (A), and influence of NFI4ZSM5 and FIY zeolites on RB137 degradation efficiency (B) by UV/O3 process (pFI 8).

Additionally, the combination of trace enrichment and microbore columns can effectively increase the maximum sample volume injectable without seriously degrading efficiency. Slais et al. (29) evaluated this combination for the determination of polynuclear hydrocarbons and chlorinated phenols in water. By using reversed-phase HPLC and am-perometric detection, Slais et al. (29) reported lower limits of detection from 20 to 280 ng/L of water (parts per trillion) when 1-mL sample enrichments were carried out directly on the analytical microbore column. 

Nevertheless, water purification has lagged behind air purification in the process of commercialization. Major problems in practical application to water treatment, as compared to air purification, car. be summarized as follows. CD The degradation efficiency is lower in water. (2) Pollutant concentration in polluted water is generally higher than in air. (D Pollutant has less contact with the photocatalyst, due to its slower diffusion in water. Recovery of powder photocatalyst from water causes engineering difficulties in automatic operation. Despite these difficulties, research and development are still very active This chapter introduces some of the progress made in the fielc. 

UV/H202 treatment at pH 2.5 degraded CPs in the following order 2,4,6-trichlorophenol (TCP) > 2,4-dichlorophenol (DCP) > 2-CP However, differences between the degradation efficiencies of CPs studied in basic media (pH = 9.5) were less. The decrease of the initial pH decreased the overall degradation rate of CP. 

Phenol is degraded faster by ozone processes under basic pH than acidic pH because the contribution of hydroxyl radicals increases with pH. Table 14.2 lists the degradation efficiency of phenol under various experimental... 

In regard to the degree of conversion of p-hydroxybenzoic acid at 5 and 10 min of reaction time, the degradation efficient of AOPs using Fenton s reagent follows the increasing order ... 

Typical phocatalytic degradation efficiencies in water treatment are a few percent at best or less than 1% in most... 

Bianchi (2001) further supported that lignin was not degraded efficiently under low-oxygen conditions in a tidal stream, adjacent to Lake Pontchartrain estuary (USA). 

Cellulose and complex pectic polysaccharides are the main matrix of the water-insoluble residue after centrifugation of fruit and vegetable homogenates. The use of pectinolytic enzymes is therefore necessary to solubilize the solid sample. Pectinolysis is known to degrade efficiently large pectic polysaccharides, but some of them, for example, rhamnogalacturonan-II, are considered to be resistant to pectinolytic enzymes [45]. A mixture of commercial products Rapi-dase LIQ and Pectinex Ultra-SPL , was reported for the release of metal-complexes from the solid parts of edible plants, fmits, and vegetables [45]. 

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