氯氧化铋的制备及其用于可见光催化降解罗丹明B.pdf

石油化
2013年第42卷第10期
PETROCHEMICAL TECHNOLOGY
?1165
氯氧化铋的制备及其用于可见光
催化降解罗丹明B
毛晓明,李敏,靳永胜
(长治学院化学系,山西长治046011)
「摘要]以铋酸钠、碘化钾和盐酸为原料,无水乙鯨为分散剂,采用氧化还原法合成了具有高可见光催化活性的氯氧化铋
( Biocl)催化剂,采用XRD,TEM, HRTEN,XPS,UV- Vis DRS等手段对其组成、形貌和光学吸收性能进行了表征。以罗
丹明B(RhB)为目标降解物,考察了 BIOCH催化剂在可见光下的光催化活性及动力学行为。表征结果显示,BiOC1为片层纳
米粉体,暴露晶面为(012)晶面;与常规方法制备的BiOC1相比,其吸收带边明显红移,禁带宽度变窄(为2.3ev)。光催化
降解RhB的实验结果表明, Biocl光催化降解RhB反应表现为假一级动力学,且其光催化活性优于常規 Bioc1z和P25催化剂。
BiOC!催化剂具有较高的光热稳定性,重复使用4次后,RhB的降解率变化不明显,仍可达到95.0%。
关键词」氯氧化铬;氧化还原法;光催化降解;罗丹明B
文章编号]1000-8144(2013)10-1165-05
[中图分类号」TQ426.6
文献标志码]A
Preparation of BIOCI and Its Application to Visible-light-induced
Photocatalytic Degradation of RHB
Mao Xiaoming, Li Min, Jin Yongsheng
Department of Chemistry, Changzhi University, Changzhi Shanxi 046011, China)
Abstract! BIOC powder was prepared by a redox method from NABIO,, KI and Hcl with
absolute ethyl alcohol as the dispersant. The structure, morphology and optical properties of the
prepared BIOC! were characterized by means of XRD, TEM, HRTEM, XPS and UV-VIS DRS
The photocatalytic activity and kinetics of the BIOCI for the degradation of Rhodamine B(RB )under
visible light were investigated. The characterization results indicated that the prepared BIOCI was
nanopowder with layer-structure and the exposed crystal faces were(012). The BIOCI has a significant
red-shift in the absorption band and the width of its forbidden band is narrower(2.3 ev)than that of
conventional BIOCL. The photocatalytic reaction results showed that the degradation of Rhb was a
pseudo-first order reaction and the photocatalytic activity of the prepared Bioc was much higher than
those of conventional Biocl and P25. After the catalyst was used 4 times, the degradation rate still
reached 95.0%
L Keywords J bismuth oxychloride; redox method; photocatalytic degradation; Rhodamine B
随着染料工业的发展,其生产废水已成为当应7”。氯氧化铋( BIOCI)高度各向异性的层状?
前最重要的水体污染源之一。国内外学者采用各种构使其具有良好、稳定的光催化活性[s-9;但其禁
方法去除水中的染料分子,其中光催化氧化法因带宽度较笕同样限制了对可见光的利用012。因
其节能高效、性质稳定、污染物降解彻底而被广此,如何降低 BIOCI的禁带宽度,更有效的利用太
泛应用12。TiO2是应用最为广泛的光催化剂,且
[收稿日期12013-04-20;[修改稿日期]2013-06-21。
已广泛用于废水处理领域,但其较宽的禁帯宽『作者介」毛晓明(1ーう、男.、山西合平遍县人、士生
度(约3.2eV)使其只对波长小于387nm的光产生响讲师,电话1873459544,电邮maoxlaoming20l3@gmail.com