Study On Treament Of Wastewater Containing Cr(Ⅵ) By Active Carbon And Preparation Of Biodiesel With KOH Supported On Active Carbon As Catalyst

Because of the huge surface areas and chemical stability, the actived carbon is a kind of good adsorbents and catalysts. This thesis is devided into two parts to investigated the characteristic of the actived carbon.The first part:Cr(Ⅵ)-containing wastewater is harmful to human being health and natural environment. So it is necessary to remove the Cr(Ⅵ) from the waste water. In this paper, the static test is carried out according to the capacity of adsorbents removing Cr(Ⅵ). First, author is studied the adsorbability of the original actived carbon. When the pH of wastewater is 3, the dosage of actived carbon is 0.5 g, the absorbing time is 3 h, the removal rate of Cr(Ⅵ) could be higher than 99.96%. When the nitric acid(7.6 mol/L) modification on the ash, pH of wastewater is 4, the dosageof actived carbon is 0.18 g, the absorbing time is 3 h, the removal rate of Cr(Ⅵ) could be higher than 99.97%. Compared the original actived carbon, modified ash has higher adsorbability.The second part:Biodiesel was produced by trans-esterification of pricklyash seed oil catalyzed by solid base catalyst -KOH supported on active carbon. The conditions to prepare biodiesel had been studied, such as catalyst, mole ratio of methanol to oil,dosage of catalyst and reaction time. The product was analyzed by infrared spectroscopy and GC-MS. The molar ratio of ethanol to soybean oil 10:1, the amount of catalyst was the quality of oil 3.0%(w), reaction time 6 h, reaction temperature 75℃were the optimal conditions. Under the optimum conditions, we gained highly pure biodiesel, the yield could reach 87.3%.