无机材料学报 ›› 2019, Vol. 34 ›› Issue (9): 974-982.DOI: 10.15541/jim20180558
张晓锋1,张冠华1,孟跃2,薛继龙1,夏盛杰1(),倪哲明1(
)
收稿日期:
2018-11-29
修回日期:
2019-03-13
出版日期:
2019-09-20
网络出版日期:
2019-05-13
作者简介:
张晓锋(1993-), 女, 硕士. E-mail: 13526687393@163.com
基金资助:
ZHANG Xiao-Feng1,ZHANG Guan-Hua1,MENG Yue2,XUE Ji-Long1,XIA Sheng-Jie1(),NI Zhe-Ming1(
)
Received:
2018-11-29
Revised:
2019-03-13
Published:
2019-09-20
Online:
2019-05-13
Supported by:
摘要:
采用共沉淀法合成席夫碱钴(SBCo)插层钴铬水滑石(CoCr-LDHs)材料。通过X射线粉末衍射(XRD)、紫外-可见漫反射光谱(UV-Vis DRS)、扫描电子显微镜(SEM)、透射电子显微镜(TEM-EDX)、X射线光电子能谱(XPS)、比表面积(BET)分析表征CoCr-LDHs以及CoCr/SBCo-LDHs材料的结构和性质。以H2O2作光催化助剂, 考察了不同插层量、催化剂用量以及亚甲基蓝溶液的初始浓度对光催化活性的影响, 并探究了光催化降解过程的动力学和主要的活性基团。实验结果表明: H2O2有助于提高水滑石材料的光催化性能, 以氙灯模拟太阳光, 20 mg CoCr/SBCo0.5-LDHs和H2O2的协同作用对初始浓度为25 mg/L的亚甲基蓝降解率高达99%。亚甲基蓝的光降解过程符合准一级动力学模型, 且起主要作用的活性基团为h +和·OH。
中图分类号:
张晓锋,张冠华,孟跃,薛继龙,夏盛杰,倪哲明. 席夫碱钴改性CoCr-LDHs材料光催化降解亚甲基蓝研究[J]. 无机材料学报, 2019, 34(9): 974-982.
ZHANG Xiao-Feng,ZHANG Guan-Hua,MENG Yue,XUE Ji-Long,XIA Sheng-Jie,NI Zhe-Ming. Photocatalytic Degradation of Methylene Blue by Schiff-base Cobalt Modified CoCr Layered Double Hydroxides[J]. Journal of Inorganic Materials, 2019, 34(9): 974-982.
图2 样品的XRD(A)、UV-Vis漫反射光谱图(B)以及(ahv)2 vs hv图谱(C)
Fig. 2 XRD patterns (A) and UV-Vis diffuse reflectance spectra (B) and plots of (ahv)2 vs hv (C) for the samples
图4 CoCr-LDHs和CoCr/SBCo0.5-LDHs的SEM、TEM照片及EDX谱图
Fig. 4 SEM and TEM images of CoCr-LDHs and CoCr/ SBCo0.5-LDHs, and EDX analysis of CoCr/SBCo0.5-LDHs SEM images of CoCr-LDHs(A) and CoCr/SBCo0.5-LDHs (B); TEM images of CoCr/SBCo0.5-LDHs (C) and EDX analysis of designated area (D)
图6 CoCr-LDHs (A)和CoCr/SBCo-LDHs (B)的低温氮气吸附脱附等温线和孔径分布(插图)
Fig. 6 N2 adsorption-desorption isotherms and pore size distribution curves (insets) for CoCr-LDHs (A) and CoCr/SBCo-LDHs (B)
Sample | Surface area/(m2?g-1) | Pore volume/(cm3?g-1) | Average pore size/nm | Peak of pore size distribution/nm |
---|---|---|---|---|
CoCr-LDHs | 96.4 | 0.537 | 22.5 | 20, 65 |
CoCr/SBCo0.5-LDHs | 107.8 | 0.526 | 19.2 | 18, 30, 60 |
表1 CoCr-LDHs和CoCr/SBCo0.5-LDHs的结构性能参数
Table 1 Textural properties for CoCr-LDHs and CoCr/SBCo0.5-LDHs
Sample | Surface area/(m2?g-1) | Pore volume/(cm3?g-1) | Average pore size/nm | Peak of pore size distribution/nm |
---|---|---|---|---|
CoCr-LDHs | 96.4 | 0.537 | 22.5 | 20, 65 |
CoCr/SBCo0.5-LDHs | 107.8 | 0.526 | 19.2 | 18, 30, 60 |
Catalyst | CoCr-LDHs | CoCr/SBCo0.25-LDHs | CoCr/SBCo0.5-LDHs | CoCr/SBCo0.75-LDHs | H2O2 |
---|---|---|---|---|---|
Degradation/% | 7 | 9 | 10 | 10 | 13 |
表2 催化剂和H2O2分别对MB的降解率
Table 2 Degradation rate of methylene blue by catalyst and H2O2
Catalyst | CoCr-LDHs | CoCr/SBCo0.25-LDHs | CoCr/SBCo0.5-LDHs | CoCr/SBCo0.75-LDHs | H2O2 |
---|---|---|---|---|---|
Degradation/% | 7 | 9 | 10 | 10 | 13 |
图7 席夫碱钴插层量对光催化MB的影响
Fig. 7 Influence of intercalated schiff-base cobalt dosage intercalation on photocatalytic MB a: No catalyst and H2O2; b: CoCr-LDHs; c: CoCr/SBCo0.25-LDHs; d: CoCr/SBCo0.5-LDHs; e: CoCr/SBCo0.75-LDHs
LDHs | K/h-1 | R2 | t1/2/h |
---|---|---|---|
CoCr-LDHs | 0.0095 | 0.9536 | 72.9628 |
CoCr/SBCo0.25-LDHs | 0.0564 | 0.9689 | 12.2898 |
CoCr/SBCo0.5-LDHs | 0.8869 | 0.9984 | 0.7815 |
CoCr/SBCo0.75-LDHs | 0.1241 | 0.9961 | 5.5854 |
表3 不同材料光降解MB的准一级动力学参数
Table 3 Pseudo-first-order kinetic parameters for MB photodegradation by different materials
LDHs | K/h-1 | R2 | t1/2/h |
---|---|---|---|
CoCr-LDHs | 0.0095 | 0.9536 | 72.9628 |
CoCr/SBCo0.25-LDHs | 0.0564 | 0.9689 | 12.2898 |
CoCr/SBCo0.5-LDHs | 0.8869 | 0.9984 | 0.7815 |
CoCr/SBCo0.75-LDHs | 0.1241 | 0.9961 | 5.5854 |
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