Photodegradation of mixed organic dyes and ciprofloxacin antibiotic using spray pyrolyzed Li-Nb co-doped SnO2 thin films

IF 5.7 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Gouranga Maharana , Yuvashree Jayavelu , D. Paul Joseph , Reddivari Muniramaiah , S. Divyadharshini , Kovendhan Manavalan
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Abstract

Immobilized photocatalysts are emerging in prominence for photocatalytic degradation of various kinds of harmful pollutants. In order to tune SnO2 thin films as an effective transparent conducting photoelectrode towards photocatalytic degradation, the effects of lithium and niobium co-doping are examined for their structural, morphological, and optoelectronic characteristics. X-ray diffraction patterns reveal successful doping of ‘Nb’ and ‘Li’ into the SnO2 lattice rendering highly textured growth along (110), (200), (310), and (220) plane directions. X-ray photoelectron spectroscopy confirmed the charge states of Sn4+, Nb5+, O2-, and Li1+ elements to be present in the co-doped SnO2 films. FESEM micrographs reveal that the tetragonal shaped particles (0 - 1 wt.% Li doped Nb(2 wt.%):SnO2) undergo a mild agglomeration by forming more slender grains (2 - 4 wt.% Li doped Nb(2 wt.%):SnO2). The wettability nature by contact angle measurement indicates all the films to be hydrophilic in nature. Nb and Li codoping into the SnO2 lattice enhances the transmittance from 53 % for pure to 72 % for 4 wt.% Li and 2 wt.% Nb codoped SnO2 thin film. Photoluminescence emission intensity has been suppressed by the substitution of Nb and Li into the SnO2 films. Linear four-probe and Hall effect revealed sheet resistance and electrical transport properties with a minimum sheet resistance of 56 Ω/□ and with highest mobility of 34.75 cm2 V-1s-1 for 4 wt. % Li and 2 wt.% Nb doped SnO2 thin film, respectively. Based on the determined optoelectronic properties, the photocatalytic activity for solely methyl violet, mixed dyes (methyl orange, malachite green, and methylene blue), and ciprofloxacin antibiotic degradation was carried out using optimal film (1 wt.% Li: 2 wt.% Nb co-doped SnO2), and a significant degradation efficiency was achieved in both Sunlight and LED light illumination.

Abstract Image

喷雾热解Li-Nb共掺杂SnO2薄膜光降解混合有机染料和环丙沙星抗生素
固定化光催化剂在光催化降解各种有害污染物方面正日益受到重视。为了将SnO2薄膜作为一种有效的透明导电光电极进行光催化降解,研究了锂和铌共掺杂对其结构、形态和光电特性的影响。x射线衍射图显示,在SnO2晶格中成功掺杂了“Nb”和“Li”,呈现出沿(110)、(200)、(310)和(220)平面方向的高度织构生长。x射线光电子能谱证实了共掺杂SnO2薄膜中存在Sn4+、Nb5+、O2-和Li1+元素的电荷态。FESEM显微图像显示,四边形颗粒(0 ~ 1 wt.% Li掺杂Nb(2 wt.%):SnO2)通过形成更细的颗粒(2 ~ 4 wt.% Li掺杂Nb(2 wt.%):SnO2)进行了轻微的团聚。接触角测定的润湿性表明,所有膜在本质上都是亲水的。在SnO2晶格中共掺杂Nb和Li,使SnO2薄膜的透过率从纯掺杂的53%提高到掺杂4 wt.% Li和2 wt.% Nb的72%。在SnO2薄膜中加入Nb和Li抑制了其光致发光强度。线性四探针和霍尔效应显示,掺杂4 wt.% Li和2 wt.% Nb的SnO2薄膜的片电阻和电输运特性,最小片电阻为56 Ω/□,最高迁移率为34.75 cm2 V-1s-1。在光电性能测定的基础上,采用最佳膜(1 wt.% Li: 2 wt.% Nb共掺杂SnO2)对单甲基紫、混合染料(甲基橙、孔雀石绿和亚甲基蓝)和环丙沙星抗生素进行了光催化降解,在阳光和LED光照射下均取得了显著的降解效率。
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来源期刊
Surfaces and Interfaces
Surfaces and Interfaces Chemistry-General Chemistry
CiteScore
8.50
自引率
6.50%
发文量
753
审稿时长
35 days
期刊介绍: The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)
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