In the process of synthesis of nanometer SiC precursors with sol-gel of SiO2 and lignin , the products of all sizes required can be controlled by the concentration of reac-t ants , pH, temperature, reaction and ageing...In the process of synthesis of nanometer SiC precursors with sol-gel of SiO2 and lignin , the products of all sizes required can be controlled by the concentration of reac-t ants , pH, temperature, reaction and ageing time , and so on . The best conditions in this research are : the concentration of Na2SiO3 and organic matters are 4. 50% and 26.4% respectively, pH = 3.3 , T = 65℃ , ageing time is 30min , dried at 150 ℃ , the size of SiC precursors is about 2.0μm .展开更多
采用Fenton试剂预处理高浓度苇浆造纸黑液,经正交设计得出各因素对黑液COD去除率的影响顺序为:pH>[H2O2]>[Fe2+]>反应时间。确定最佳操作条件为:初始pH=4、[H2O2]=0.088 mol/L、[Fe2+]=14.39 mmol/L、反应40 m in,此条件下废水...采用Fenton试剂预处理高浓度苇浆造纸黑液,经正交设计得出各因素对黑液COD去除率的影响顺序为:pH>[H2O2]>[Fe2+]>反应时间。确定最佳操作条件为:初始pH=4、[H2O2]=0.088 mol/L、[Fe2+]=14.39 mmol/L、反应40 m in,此条件下废水COD去除率可达80%以上,色度及浊度去除率达96%。动力学表明:Fenton试剂预处理高浓度苇浆造纸黑液的表观过程近似符合一级反应规律。废水经处理后可生化性指标BOD/COD平均从0.303升高到0.558。展开更多
文摘In the process of synthesis of nanometer SiC precursors with sol-gel of SiO2 and lignin , the products of all sizes required can be controlled by the concentration of reac-t ants , pH, temperature, reaction and ageing time , and so on . The best conditions in this research are : the concentration of Na2SiO3 and organic matters are 4. 50% and 26.4% respectively, pH = 3.3 , T = 65℃ , ageing time is 30min , dried at 150 ℃ , the size of SiC precursors is about 2.0μm .
文摘采用Fenton试剂预处理高浓度苇浆造纸黑液,经正交设计得出各因素对黑液COD去除率的影响顺序为:pH>[H2O2]>[Fe2+]>反应时间。确定最佳操作条件为:初始pH=4、[H2O2]=0.088 mol/L、[Fe2+]=14.39 mmol/L、反应40 m in,此条件下废水COD去除率可达80%以上,色度及浊度去除率达96%。动力学表明:Fenton试剂预处理高浓度苇浆造纸黑液的表观过程近似符合一级反应规律。废水经处理后可生化性指标BOD/COD平均从0.303升高到0.558。
