La-BiVO4催化剂的制备及其光催化还原 CO2

摘要

ZLa-BiVO4 photocatalyst was prepared by chemical precipitation method ,and its photocatalytic reduction of CO 2 in water was examined .The catalyst was characterized by TG-DTA ,DRS and XRD technology ,and the effect of roasting temperature and other conditions on the activity of photocatalytic reduction of CO 2 were studied .The results showed that monoclinic phase La-BiVO4 calcined at 800 ℃ has the highest activity .When the amount of catalyst was 0 .8 g/L ,reaction time was 8 h ,CO2 flow was 250 mL/min ,the reaction temperature was 70 ℃ ,and the concentration of NaOH and Na2 SO3 were both 0 .10 mol/L ,yield of methanol reached 290 .18μmol/g .%采用化学沉淀法制备了La-BiVO 4光催化剂，并应用于光催化还原CO2/H2 O体系中。通过TG-DTA、DRS、XRD对光催化剂进行表征，研究了焙烧温度等对光催化性能的影响。结果表明，800℃煅烧制得的单斜相La-BiVO4活性最高。在催化剂用量0．8 g/L、反应时间8 h、CO2流量250 mL/min、反应温度70℃、反应液中NaO H和Na2 SO3的浓度均为0．10 mol/L的条件下，甲醇产率高达290．18μ/。