Photodegradation of imidacloprid insecticide using polyethersulfone membranes modified with iron doped cerium oxide,Journal of Applied Polymer Science

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Photodegradation of imidacloprid insecticide using polyethersulfone membranes modified with iron doped cerium oxide
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2024-02-14 , DOI: 10.1002/app.55255
Kgolofelo I. Malatjie ₁ , Richard M. Moutloali ₁ , Ajay K. Mishra _{2,

3,

4} , Shivani B. Mishra _{4,

5} , Edward N. Nxumalo ₁

Affiliation

The widespread accumulation of insecticides in water systems is a growing concern. This study reports efficient photodegradation of imidacloprid (IMD) insecticide using polyethersulfone (PES) membranes modified with iron-doped cerium oxide (Fe-CeO₂). The work focuses on the modification of ultrafiltration polyethersulfone membranes with incremental amounts of Fe-CeO₂ photocatalysts (0.5–2.0 wt.%) using phase inversion method. An increase in Fe-CeO₂ content showed an improvement in surface roughness and porosity of membranes. Pure water flux (PWF) increased from 55.9 L m² h⁻¹ in M0 (PES) to 77.2 (M1, 0.5% Fe-CeO₂-PES), 118.0 (M2, 1% Fe-CeO₂-PES), 128.0 in M3 (1.5 wt.% Fe-CeO₂-PES) and then decreased to 98.5 L m² h⁻¹ in M4 (2 wt.% Fe-CeO₂-PES). This decrease is brought about by the high Fe-CeO₂ content, which minimizes the membranes' surface pores. Fe-CeO₂ photocatalysts are thought to give the membrane both hydrophilic and photocatalytic qualities because of their capacity to absorb light and create radical species that cause the photodegradation of IMD molecules. Consequently, under visible light irradiation, modified membranes demonstrated photocatalytic ability over IMD. Photocatalytic efficiencies of the membranes were found to be 5.2% (M0), 68.9 (M1), 75.8 (M2), 81.8 (M3), and 56.0% (M4), respectively, with M3 membranes showing the highest photocatalytic degradation efficiency and low leaching of metals. The remarkable performance observed by M3 membranes during both water filtration and photocatalytic performance may be an illustration of well dispersed photocatalyst which receives high absorption of light irradiation. Membranes with photocatalytic functionalities are tailored to exploit dual benefits of the membrane filtration and photocatalysis without compromising their original functions. However, maintaining the delicate balance of this phenomenon is still very challenging.

中文翻译：

铁掺杂氧化铈改性聚醚砜膜光降解吡虫啉杀虫剂

杀虫剂在水系统中的广泛积累日益引起人们的关注。_{本研究报道了使用铁掺杂氧化铈 (Fe-CeO 2} ) 改性的聚醚砜 (PES) 膜可有效光降解吡虫啉 (IMD) 杀虫剂。该工作重点是使用相转化方法用增量 Fe-CeO _{2光催化剂 (0.5–2.0 wt.%) 对超滤聚醚砜膜进行改性。}_{Fe-CeO 2}含量的增加表明膜的表面粗糙度和孔隙率得到改善。纯水通量（PWF）从M0（PES）中的55.9 L m ² h ^-1增加到77.2（M1，0.5% Fe-CeO ₂ -PES）、118.0（M2，1% Fe-CeO ₂ -PES）、128.0在M3 (1.5 wt.% Fe-CeO ₂ -PES)中，然后在M4 (2 wt.% Fe-CeO ₂ -PES)中降低至98.5 L m ² h ^{-1 。}_{这种减少是由高Fe-CeO 2}含量引起的，它最大限度地减少了膜的表面孔隙。Fe-CeO ₂光催化剂被认为赋予膜亲水性和光催化性，因为它们能够吸收光并产生导致IMD分子光降解的自由基物质。因此，在可见光照射下，改性膜表现出优于 IMD 的光催化能力。膜的光催化效率分别为 5.2% (M0)、68.9 (M1)、75.8 (M2)、81.8 (M3) 和 56.0% (M4)，其中 M3 膜的光催化降解效率最高，光催化降解效率较低。金属的浸出。M3膜在水过滤和光催化性能方面观察到的卓越性能可能是分散良好的光催化剂对光照射的高吸收的例证。具有光催化功能的膜经过专门设计，可利用膜过滤和光催化的双重优势，而不损害其原有功能。然而，维持这种现象的微妙平衡仍然非常具有挑战性。

更新日期：2024-02-14

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