La-BiVO_4催化剂的制备及其光催化还原CO_2

Preparation of La-BiVO_4 catalyst and its photocatalytic reduction property of CO_2

采用化学沉淀法制备了La-BiVO4光催化剂,并应用于光催化还原CO2/H2O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0.8g/L、反应时间8h、CO2流量250mL/min、反应温度70℃、反应液中NaOH和Na2SO3的浓度均为0.10mol/L的条件下,甲醇产率高达290.18μmol/g。

ZLa-BiVO4 photoeatalyst was prepared by chemical precipitation method, and its photocatalytic reduction of CO2 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 CO2 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 Na2SO3 were both 0.10 mol/L, yield of methanol reached 290.18 μmol/g.