We applied column experiments to investigate the environmental fate and transport of silver nanoparticles(AgNPs) in fully saturated conditions of porous media. These column experiments were performed to emphasize oxidation method with H2O2 concentration and acidic conditions. The mobility of AgNPs was decreased with the increasing ionic strength that the surface charge of AgNPs(zeta potential) was neutralized with the presence of positive ions of Na+. Additionally, it was also affected due to that not only more increased aggregated size of AgNPs and surface charge of quartz sand. The decreased breakthrough curves(BTCs) of bisphenol-A(BPA) and 17α-ethynylestradiol(EE2) were removed approximately 35.3 and 40%. This is due to that endocrine disrupting chemicals(EDCs) were removed with the release of OH․ radicals by the fenton-like mechanisms from acidic and fenton-like reagent presenting. This results considered that higher input AgNPs with acidic conditions is proved to realistic in-situ oxidation method. Overall, it should be emphasized that a set of column experiments employed with adjusting pH and H2O2 concentration in proved to be effective method having potential ability of in-situ degradation for removing organic contaminants such as BPA and EE2.

저분자량 (M=1970)을 갖는 poly(styrene)(PS)와 poly(vinymethylether) (PVME)의 블렌드를 열산화시킬 때 PVME의 분자량 감소 속도는 높은 분자량을 갖는 PS와 PVME의 블렌드를 열산화 시킬 때의 PVME 분자량 감소 속도보다 훨씬 느리다. 열산화 과정 동안 PS의 분자량은 변화하지 않았으며 저분자량의 PS의 일부가 산화된 PVME를 분리할 때 함께 녹음을 알 수 있었다. 저분자량의 PS의 모델 화합물로써 2. 4-diphenylpentane을 합성하였고 1%，5%，10%의 모델 화합물을 PVME에 첨가하여 열산화 시켰다. 이 모델 화합물을 첨가하여 PVME의 열산화를 약간 지연시킬 수 있음을 알 수 있었다.

저 분자량(Mw=1970)의 poly(styrene)(PS)와 poly(vinylmethylether)(PVME)의 블렌드를 열 산화시킬 때 저 분자량의 PS의 첨가량이 증가할수록 유도기간이 증가하며 열 산화속도는 감소함을 알 수 있었다. 열 산화과정 동안 저 분자량 PS와 PVME 블렌드는 상 분리를 보이지 않았다. 저 분자량을 갖는 PS와 PVME 블렌드에서 PVME의 산화 속도는 높은 분자량을 갖는 PS와 PVME 블렌드에서 PVME의 열 산화 속도보다 훨씬 느려짐을 보였다.

Oxidative degradation of phenol, three monochlorophenols (2-chlorophenol, 2-CP; 3-chlorophenol, 3-CP; 4-chlorophenol, 4-CP), four dichlorophenols (2,3-dichlorophenol, 2,3-DCP; 2,4-dichlorophenol, 2,4-DCP; 2,5-dichlorophenol, 2,5-DCP; 2,6-dichlorophenol, 2,6-DCP), and two trichlorophenols (2,4,5-trichlorophenol, 2,4,5-TCP; 2,4,6-trichlorophenol, 2,4,6-TCP) was conducted with heat activated persulfate. As the number of chlorinations increased, the reaction rate also increased. The reaction rate was relatively well fitted to the zero-order kinetic model, rather than the pseudo-first order kinetic model for the reactions at 60℃, which can be explained by insufficient activation of the persulfate at 60℃, and the oxidation reaction of 2,4,6-TCP at 70℃ was relatively well fitted to the pseudo-first order kinetic model. The oxidation reaction rate generally increased with increase of persulfate concentration in the solution. 2,6-dichloro-2,5-cyclohexadiene-1,4-dione was found as a degradation product in a GC/MS analysis. This compound is a non-aromatic compound, and one chlorine was removed. This result is similar to the result of previous studies. The current study proved that heat activated persulfate activation could be an alternative remediation technology for phenol and chlorophenols in soil and groundwater.

During the past few decades, significant increase in the consumption of coffee has led to rapid increase in the production of coffee waste in South Korea. Spent coffee waste is often treated as a general waste and is directly disposed without the necessary treatment. Spent Coffee Grounds (SCGs) can release several organic contaminants, including caffeine. In this study, leaching tests were conducted for SCGs and oxidative degradation of caffeine were also conducted. The tested SCGs contained approximately 4.4 mg caffeine per gram of coffee waste. Results from the leaching tests show that approximately 90% of the caffeine can be extracted at each step during sequential extraction. Advanced oxidation methods for the degradation of caffeine, such as UV/H2O2, photo-Fenton reaction, and UV/O3, were tested. UV radiation has a limited effect on the degradation of caffeine. In particular, UV-A and UV-B radiations present in sunlight cause marginal degradation, thereby indicating that natural degradation of caffeine is minimal. However, O3 can cause rapid degradation of caffeine, and the values of pseudo-first order rate constants were found to be ranging from 0.817min-1 to 1.506 min-1 when the ozone generation rate was 37.1 g/m3. Additionally, the degradation rate of caffeine is dependent on the wavelength of irradiation.