Development of polyaniline-tin oxide (PAni-SnO2) as binary photocatalyst for toxic pollutant removal

IF 3.1 3区化学 Q2 POLYMER SCIENCE

Polymer Bulletin Pub Date : 2024-11-28 DOI:10.1007/s00289-024-05586-2

Wai-Leon Low, Chiam-Wen Liew, Joon-Ching Juan, Sook-Wai Phang

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引用次数: 0

Abstract

Azo dyes are commonly used as a coloring agent in the textile industry to beautify the textile products. However, due to the non-biodegradable and toxic nature of azo dyes, it is imperative to degrade the toxic dye in the textile effluent in order to prevent it from penetrating the aquatic ecosystem and causing environmental pollution. For this purpose, binary photocatalysts of polyaniline—tin oxide (PAni-SnO₂) with different weight percent of SnO₂ were synthesized using template-free method. The chemical structures and oxidation states of the photocatalysts were confirmed by Fourier transform infrared (FTIR) and ultra-violet visible (UV–Vis) spectroscopies, respectively. The existence of SnO₂ was characterized by X-ray diffraction (XRD) analysis, while morphology of the photocatalysts was investigated by field emission scanning electron microsocopy (FESEM). Electrical conductivities of PAni-SnO₂ binary photocatalysts were measured by conductivity meter showing conductivity range of 6.55 × 10^–6–2.66 × 10^–3 S cm⁻¹. The photodegradation performance of PAni-SnO₂ binary phorocatalysts for toxic RB5 azo dye was in the range of 30.26–72.94% in which PAni-SnO₂(10%) demonstrates the highest photodegradation performance of 72.94%. This can be explained by its high surface area nanorods and nanotubes morphology that promotes electron conductivity (2.66 × 10^–3 S cm⁻¹) and for better RB5 adsorption. Also, its low band gap (1.98 eV) enabling easy excitation of electrons to form electron–hole pairs and low electron-pair recombination rate (low PL emission intensity of 7.29 × 10³ a.u.) are the other factors that contribute to its excellent photodegradation performance.

Graphical abstract

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聚苯胺-氧化锡（PAni-SnO2）二元光催化剂去除有毒污染物的研究

偶氮染料是纺织工业中常用的一种着色剂，用于美化纺织品。然而，由于偶氮染料的不可生物降解性和毒性，对纺织废水中的有毒染料进行降解是当务之急，以防止其渗入水生生态系统，造成环境污染。为此，采用无模板法合成了不同SnO2质量分数的聚苯胺-氧化锡二元光催化剂。利用傅里叶变换红外光谱（FTIR）和紫外可见光谱（UV-Vis）分别确定了光催化剂的化学结构和氧化态。采用x射线衍射（XRD）分析了SnO2的存在，并用场发射扫描电镜（FESEM）研究了光催化剂的形貌。用电导率仪测定了聚苯胺- sno2二元光催化剂的电导率，电导率范围为6.55 × 10-6-2.66 × 10-3 S cm−1。PAni-SnO2二元光催化剂对有毒RB5偶氮染料的光降解性能在30.26 ~ 72.94%之间，其中PAni-SnO2（10%）的光降解性能最高，达到72.94%。这可以通过其高表面积的纳米棒和纳米管形态来解释，这些纳米棒和纳米管形态促进了电子电导率（2.66 × 10-3 S cm−1）和更好的RB5吸附。此外，其低带隙（1.98 eV）易于激发电子形成电子空穴对和低电子对复合率（低PL发射强度为7.29 × 103 a.u.）是其具有优异光降解性能的其他因素。图形抽象

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来源期刊

Polymer Bulletin 化学-高分子科学

CiteScore

6.00

自引率

6.20%

发文量

审稿时长

5.5 months

期刊介绍： "Polymer Bulletin" is a comprehensive academic journal on polymer science founded in 1988. It was founded under the initiative of the late Mr. Wang Baoren, a famous Chinese chemist and educator. This journal is co-sponsored by the Chinese Chemical Society, the Institute of Chemistry, and the Chinese Academy of Sciences and is supervised by the China Association for Science and Technology. It is a core journal and is publicly distributed at home and abroad. "Polymer Bulletin" is a monthly magazine with multiple columns, including a project application guide, outlook, review, research papers, highlight reviews, polymer education and teaching, information sharing, interviews, polymer science popularization, etc. The journal is included in the CSCD Chinese Science Citation Database. It serves as the source journal for Chinese scientific and technological paper statistics and the source journal of Peking University's "Overview of Chinese Core Journals."