Title : Effects of NOM concentrations on the photocatalytic removal of 4-chloro-2-methylphenoxyacetic acid (MCPA) micropollutant from the surface water using CNT-TiO2 nano catalytic systems
Abstract:
Previous studies have reported that NOM interferes with photocatalytic degradation via inner filter effect, radical scavenging, and competition between NOM and target OMPs over the active sorption sites. Such inhibitory effect of NOMs can be attributed to three main facts. Firstly, the NOMs present in water matrices act as the “inner UV filter”. NOMs have strong absorption in UV and near UV range, the presence of NOMs in water would decrease the availability of UV light for TiO2 to produce ROS, thus decreasing the ROS and h+ production. This “inner UV filter” effect is dependent on the wavelength of photons, in general stronger “inner UV filter” effect is expected in shorter wavelength UV range. Secondly, NOM can also act as scavenger of ·OH and h+ which are known as the primary oxidants in TiO2 photocatalytic systems. Thirdly, NOMs can inhibit the target pollutant degradation via competitive adsorption on the TiO2 surface. Therefore this study investigates the effect of dissolved natural organic matter (NOMs) on 4-chloro-2-methylphenoxyacetic acid (MCPA, a typical micropollutant found in many water bodies) photooxidation via CNT-TiO2 nano catalytic system.The removal of MCPA decreased from 99% to 60% and 58%, in the presence of only 5 mg/L SWR-NOM and UMR-NOM respectively. At a pH 4.00 in the presence of 10 mg/l MCPA SWR-NOM and UMR-NOM the MCPA yield decreased from 99% to 59 % and 50% in the presence of 3 mg/l CNT-TiO2 with a TiO2 ratio of 23%
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