Photocatalytic degradation of phenol was carried out with UV-illuminated TiO2- SiO2 in aqueous suspension. TiO2-SiO2 catalysts were prepared by sol-gel method from the titanium isopropoxide and tetraethylorthosilicate at different Ti/Si ratio and some commercial TiO2 catalysts were used as purchased. All catalysts were characterized by X-ray Diffraction(XRD) and BET surface area analyzer. The effect of reaction conditions, such as initial concentration of phenol, reaction temperature and catalyst weight on the photocatalytic activity was studied. In addition, TiO2-SiO2(49:1) prepared by sol-gel method showed higher activity than commercial TiO2 catalysts on the photocatalytic degradation of phenol. The addition of SiO2 into TiO2 hepled to increase the thermal stability of titania which suppressed the formation of anatase into rutile. The photocatalytic degradation of phenol showed pseudo-1st order reaction and the degradation rate increases with decreasing initial phenol concentration.

천연식초를 이용하여 분말식초의 제조방법을 개발하고 아울러 분말식초의 품질특성 및 제조공정을 평가하여 분말식초의 제조 가능성을 검토하고자 하였다. 식초와 포접물질을 혼합한 포접물의 최적 농도는 피복물질의 양이 많을수록 흡습이 잘 되지 않고 열에도 안정함을 보였으나 포접물질의 양이 증가할수록 포접물질의 맛이 강하게 나타나 식초의 고유한 관능적인 특성이 떨어지므로 포접물의 농도를 30。bx 로 결정하였다. 분무건조공정을 최적화하기 위해 인입온도와 fl

The hydroxyapatite(HAp) for the present study was prepared with the wastewater sludge from semiconductor fabrication process and it was crystallized in an electric furnace for 30 min at 900℃. The adsorption characteristics of HAp for phosphate ion in aqueous solution has been investigated. The adsorbed ratio of phosphate ion for HAp were investigated according to the reaction time, amount of HAp, concentration of standard solution, pH of solution, and influence of concemitant ions. The amount of adsorbed phosphate ion decreased with the increase of pH due to the mutual electrostatic repulsion between adsorbed phosphate ions and competitive adsorption between phosphate ion and OH- ion in aqueous solution. The maxium amount of the adsorption equilibrium for phosphate ion was about 24 mg/g of HAp. The HAp would likely to be a possible adsorbent for the removal of phosphate ion in the waste water.

토하(土鰕 ; Caridina denticulata denticulata )에 약 8, 10, 13 및 23%의 식염과 재래식 간장으로 5가지의 염장 토하젓을 만든 뒤, 41에서 3개월 동안 발효.숙성하고, 찹쌀밥, 마늘, 생강, 고춧가루 등의 양념을 섞은 후, 41에서 2개월 동안 숙성시켜 완숙된 양념 토하젓(RST)을 만든 뒤 동결건조(FIST) 시켜, 소량씩 진공.포장하여 취급이 쉽고, 유통시 품질저하를 막을수 있는 간편하고, 안전한 동결

곶감의 건조 및 저장에 따른 미생물상의 변화를 조사하였다. 곳감의 제조 지역에 따라 건조 초기의 미생물수는 상주시 외곽지역의 곶감이 다소 높았으나 반건시상태가 되는 건조 7 주 후에는 두 지역의 미생물 수의 차이는 없었다. 건조가 진행됨에 일반세균과 초산균은 꾸준히 감소하여 7주 후에는 거의 관찰되지 않았으나 곰팡이와 효모 수는 점차 늘어나는 양상을 보였다. 곶감을 32, 실온(10~15), 저온(42)에서 7주간 저장한 결과 저온 저장구에서 미

In recent years, the demand of activated carbon has been increasing steadily because of the environmental problems. Among them waste and water treatment and removal of poisonous gas were involved. Therefore, in this study, activated carbon was made from the waste chinese cabbage and measured the iodine adsorption ability, carbonization yield, and activation yield of the produced activated carbon. The result showed that the carbonization yield was decreased when carbonization temperature was increased and that the optimal carbonization temperature was 600℃. The optimal concentration of NaOH for removing ash in the raw sample was 1∼2N. The range of iodine adsorption number of activated carbon using chinese cabbage at 600℃ carbonization was 610.82㎎/g to 1019.58㎎/g. The activation result of carbonization sample showed that the optimal activation condition was the carbonization at 400℃ and the activation at 700℃. So the production of activated carbon using chinese cabbage was possible in the aspect of reuse of resource and decrease of environmental pollution compared to the commercial activated carbon.