多孔竹炭/二氧化钛纳米复合材料制备及其光催化作用

doi:10.15541/jim20180379

无机材料学报 ›› 2019, Vol. 34 ›› Issue (2): 219-224.DOI: 10.15541/jim20180379 CSTR: 32189.14.10.15541/jim20180379

多孔竹炭/二氧化钛纳米复合材料制备及其光催化作用

庞秋虎¹,廖光福¹,胡晓宇¹,张全元^1,2,徐祖顺¹

1. 湖北大学材料科学与工程学院, 有机化工新材料湖北省协同创新中心, 功能材料绿色制备与应用教育部重点实验室, 武汉 430062;
2. 钦州学院广西高校北部湾石油天然气资源有效利用重点实验室, 钦州 535000

收稿日期:2018-08-22 出版日期:2019-02-20 网络出版日期:2019-01-24
作者简介:庞秋虎. E-mail: 350902598@qq.com

Porous Bamboo Charcoal/TiO₂ Nanocomposites: Preparation and Photocatalytic Property

PANG Qiu-Hu¹, LIAO Guang-Fu¹, HU Xiao-Yu¹, ZHANG Quan-Yuan^{1, 2}, XU Zu-Shun¹

1. Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Material, School of Materials Sciences and Engineering, Hubei University, Wuhan 430062, China;
2. Guangxi Colleges and Universities Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization, Qinzhou University, Qinzhou 535000, China

Received:2018-08-22 Published:2019-02-20 Online:2019-01-24
About author:PANG Qiu-Hu (1993-), male, candidate of Master degree. E-mail: 350902598@qq.com
Supported by:
Foundation item: Natural Science Foundation of Hubei Province (2013CFB011);Guangxi Colleges and Universities Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization, Qinzhou University (2014KL0G07)

摘要/Abstract

摘要：

本工作合成了一种具有高吸附性能和光催化性能的表面改性竹炭/二氧化钛(SMBC/TiO₂)纳米复合材料。通过湿法氧化处理廉价、天然绿色的竹炭(BC), 制备了具有良好吸附性、化学稳定性的表面改性竹炭(SMBC)。经过改性, BC表面生成大量含氧官能团, 因此SMBC粒子易分散于水中, 并且与TiO₂有较强的相互作用, 确保TiO₂均匀地负载在SMBC表面。SMBC/TiO₂比BC/TiO₂有更大的比表面积, 能提供更强的吸附性能。SMBC/TiO₂的饱和吸附容量大约是BC/TiO₂的1.6倍, 是TiO₂的12.1倍。吸附和催化的协同作用使SMBC/TiO₂复合材料降解MB具有更高的光催化活性, SMBC/TiO₂光催化降解MB的速率常数分别是BC/TiO₂ 和TiO₂的7倍和6倍。

关键词: TiO₂, 多孔材料, 湿法氧化, 光催化, 吸附

Abstract:

Here we report a novel surface modified bamboo charcoal/TiO₂ (SMBC/TiO₂) nanocomposites with high adsorption and photocatalytic property. SMBC were prepared by a wet oxidization method of cheap natural bamboo charcoal (BC) with good absorbent and chemical stabilities. After modification, high density of carboxyl groups were generated on the surface of BC, thus SMBC particles can be easily dispersed in water and have stronger interactions with TiO₂ nanoparticles, which ensure SMBC uniformly coated on TiO₂. And SMBC/TiO₂ nanocomposties have much higher specific surface area than BC/TiO₂, which could offer higher adsorption capacity. The saturated adsorption capacity of SMBC/TiO₂ is approximately 1.6 times, 12.1 times as great as BC/TiO₂ and pure TiO₂, respectively. The synergetic effect of adsorption and catalysis endow SMBC/TiO₂ composites much higher photocatalytic activity than BC/TiO₂ and pure TiO₂ for MB degradation, and the rate constant for MB photocatalytic degradation of SMBC/TiO₂ was almost 7 times and 6 times as large as BC/TiO₂ and pure TiO₂, respectively.

Key words: TiO₂, porous materials, wet oxidization, photocatalysis, adsorption

中图分类号:

TF125

庞秋虎,廖光福,胡晓宇,张全元,徐祖顺. 多孔竹炭/二氧化钛纳米复合材料制备及其光催化作用[J]. 无机材料学报, 2019, 34(2): 219-224.

PANG Qiu-Hu, LIAO Guang-Fu, HU Xiao-Yu, ZHANG Quan-Yuan, XU Zu-Shun. Porous Bamboo Charcoal/TiO₂ Nanocomposites: Preparation and Photocatalytic Property[J]. Journal of Inorganic Materials, 2019, 34(2): 219-224.

图/表 8

Scheme 1 Schematic illustration of the formation for SMBC/TiO2 nanocomposites

Fig. 1 (a) FT-IR spectra of BC and SMBC, (b) XRD patterns of pure TiO2 and SMBC/ TiO2 nanocomposites

Fig. 2 FESEM images of nanocomposites(a-b) BC/TiO2; (c-d) SMBC/TiO2

Fig. 3 N2 adsorption-desorption isotherms of BC/TiO2 and SMBC/TiO2 nanocomposit

Table 1 Textural properties of different materials

Sample	S_BET/(m²·g^-1)	V_t/(cm³·g^-1)	Pore size/nm
BC/TiO₂	71	0.17	7.7
SMBC/TiO₂	155	0.36	13.7

Fig. 4 (a) Changes of relative concentration of MB in the presence of TiO2, BC/TiO2 and SMBC/TiO2 under the same condition, and (b) ln(C0/Ct) vs. time of MB photocatalytic degradation for pure TiO2, BC/TiO2 and SMBC/TiO2

Table 2 Saturated adsorption capacity of MB in dark and kinetic data of photocatalytic degradation in the presence of different catalysts

Sample	Q/(mg·g^-1)	k/(×10^-2, min^-1)
TiO₂	5.9	0.79
BC/TiO₂	44.7	0.66
SMBC/TiO₂	71.5	4.85

Fig. 5 Time-dependent UV-Vis spectra of MB aqueous solution in the presence of pure TiO2 (a), BC/TiO2 (b) and SMBC/TiO2 (c). The insets show the corresponding changes of MB aqueous solution in color

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多孔竹炭/二氧化钛纳米复合材料制备及其光催化作用

Porous Bamboo Charcoal/TiO₂ Nanocomposites: Preparation and Photocatalytic Property

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多孔竹炭/二氧化钛纳米复合材料制备及其光催化作用

Porous Bamboo Charcoal/TiO2 Nanocomposites: Preparation and Photocatalytic Property

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Porous Bamboo Charcoal/TiO₂ Nanocomposites: Preparation and Photocatalytic Property