CAJ | 학술논문

以竹炭作为纳米二氧化钛(TiO_2)粒子的载体物质,制备了二氧化钛/竹炭复合材料,并以苯酚为模型物质,对其光催化性能进行了研究.研究表明,此复合材料对苯酚具有较强的吸附性能,其中吸附平衡常数K_a为0.007 7 L·mg~(-1),K_a与苯酶吸咐平衡质量浓度ρ_e的乘积为0.25～1.35,二氧化钛/竹炭复合体的吸附作用不能忽略.根据L-H(Langmuir-Hinshelwood)方程积分所得分数级动力学方程较一级动力学方程能更好地描述其光催化降解规律,相应的光催化降解动力学方程为ln ρ-0.007 7_ρ=6.58-0.002 39_t(ρ为苯酚质量浓度,t为光照时间).
이죽탄작위납미이양화태(TiO_2)입자적재체물질,제비료이양화태/죽탄복합재료,병이분분위모형물질,대기광최화성능진행료연구.연구표명,차복합재료대분분구유교강적흡부성능,기중흡부평형상수K_a위0.007 7 L·mg~(-1),K_a여분매흡부평형질량농도ρ_e적승적위0.25～1.35,이양화태/죽탄복합체적흡부작용불능홀략.근거L-H(Langmuir-Hinshelwood)방정적분소득분수급동역학방정교일급동역학방정능경호지묘술기광최화강해규률,상응적광최화강해동역학방정위ln ρ-0.007 7_ρ=6.58-0.002 39_t(ρ위분분질량농도,t위광조시간).
TiO_2/bamboo charcoal composite was prepared by loading TiO_2 into bamboo charcoal.The photocatalytic activity of TiO_2/bamboo charcoal composite was evaluated using phenol as a model substrate.The experimental results demonstrated that TiO_2/bamboo charcoal composite had good adsorption capacity.The adsorption equilibrium constant(K_a)was 0.007 7 L·mg~(-1),K_aρ_e(ρ_e referred to equilibrium adsorption concentration of phenol)was from 0.25 to 1.35.It Was found that the Langmuir-Hinshelwood model in its integral form in describing the fraction order kinetics of phenol photocatalytic degradation in the TiO_2/bamboo charcoal composite were better than its simplified form as a first-order reaction model,since the significant substrate adsorption on the catalysts was not negligible,the corresponding photocatalytic degradation reaction equation was:lnρ-0.007 7_ρ=6.58-0.002 39_t(ρ referred to phenol concentration,and t referred to adsorption time).