Environmental Science and Pollution Research ( IF 5.8 ) Pub Date : 2021-05-06 , DOI: 10.1007/s11356-021-14248-z Gang Su 1 , Lihua Liu 1, 2, 3 , Lixing Zhang 1 , Xing Liu 1 , Jianrong Xue 1, 2, 3 , Anping Tang 1, 2, 3
A novel magnetic Fe3O4@SiO2@Bi2O2CO3/rGO composite comprising of uniform core-shell-structured Fe3O4@SiO2@Bi2O2CO3 microspheres mounted on reduced graphene oxide (rGO) sheets was successfully fabricated by using a facile hydrothermal method. The adsorption–desorption isotherm of Fe3O4@SiO2@Bi2O2CO3/rGO belonged to type IV with an H4-type hysteresis loop. The specific surface areas and magnetization saturation value (Ms) of Fe3O4@SiO2@Bi2O2CO3/rGO (x = 0.15 g) were 102.12 m2/g and 25.4 emu/g, respectively. Fe3O4@SiO2@Bi2O2CO3/rGO (x = 0.15 g) exhibited remarkable photocatalytic degradation activity and mineralization effect for MO and decolorization performance for the mixed solution of MO, Rh B, and MB. MO degradation by Fe3O4@SiO2@Bi2O2CO3/rGO conformed to a first-order kinetic reaction, and the corresponding kapp value was 0.05553 min−1. A suitable amount of rGO in Fe3O4@SiO2@Bi2O2CO3/rGO could decrease the energy band gap, inhibit the recombination of photo-induced electron/hole (e−/h+) pair, and broaden and enhance the response of the catalyst to visible light, thereby enhancing the visible-light catalytic degradation of organic dyes. The active species produced in the photocatalysis included •O2−, •OH, and h+, with •O2− being the dominant active species. The as-prepared photocatalyst also showed excellent magnetic separation performance and stability. Results show that the as-prepared Fe3O4@SiO2@Bi2O2CO3/rGO composite is a promising photocatalyst with considerable application potential in organic dyes removal.
中文翻译:
磁性Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3 /rGO复合材料的制备以提高其对有机染料的光催化性能和可回收性
一种新型磁性 Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3 /rGO 复合材料,由均匀核壳结构的 Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3微球组成,安装在还原氧化石墨烯(rGO)上) 片材是通过使用简便的水热法成功制造的。Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3的吸附-解吸等温线/rGO 属于具有 H4 型磁滞回线的 IV 型。Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3 /rGO ( x = 0.15 g)的比表面积和磁化饱和值( M s )分别为102.12 m 2 /g和25.4 emu/g。Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3 /rGO ( x= 0.15 g) 对 MO 表现出显着的光催化降解活性和矿化作用以及对 MO、Rh B 和 MB 的混合溶液的脱色性能。Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3 / rGO对MO的降解符合一级动力学反应,相应的k app值为0.05553 min -1。Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3 / rGO中适量的rGO可以降低能带隙,抑制光生电子/空穴的复合(e− /h + ) 对,拓宽和增强催化剂对可见光的响应,从而增强有机染料的可见光催化降解。光催化中产生的活性物质包括•O 2 -、•OH 和h +,其中•O 2 -是主要活性物质。所制备的光催化剂还表现出优异的磁分离性能和稳定性。结果表明,所制备的 Fe 3 O 4 @SiO 2 @Bi 2 O 2 CO 3 /rGO 复合材料是一种很有前途的光催化剂,在有机染料去除方面具有相当大的应用潜力。