Impact of Extracellular Polymeric Substance in the Inactivation of Harmful Algae by Ag2O/g‐C3N4 under Visible Light,Particle & Particle Systems Characterization

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Impact of Extracellular Polymeric Substance in the Inactivation of Harmful Algae by Ag2O/g‐C3N4 under Visible Light
Particle & Particle Systems Characterization ( IF 2.7 ) Pub Date : 2020-12-09 , DOI: 10.1002/ppsc.202000272
Gongduan Fan _{1,

2} , Jiuhong Lin ₁ , Mingqian Xia ₁ , Jing Luo ₃ , Banghao Du ₁ , Heliang Pang ₄ , Zhongsen Yan _{1,

2}

Affiliation

Photocatalysis has attracted much attention as an emerging algae removal technology, but the inactivation performance is inevitably affected by the extracellular polymeric substance (EPS) produced by algae. In this study, a photocatalyst (Ag₂O/g‐C₃N₄) with efficient algae inactivation is adopted to investigate the interactions with EPS, and the impact of EPS on photocatalytic algae removal is studied. The results show that EPS can adhere to the surface of Ag₂O/g‐C₃N₄ by electrostatic force. The interaction with EPS decreases the surface zeta potential of the Ag₂O/g‐C₃N₄ from 7.71 to −22.3 mV with the increase in EPS concentration, and the maximum ratio of particle size increases from 825 to 1281 nm. In addition, the interaction with EPS inhibits the release of Ag⁺ in Ag₂O/g‐C₃N₄ by half, thus, the toxicity of metal ions will be alleviated. Meanwhile, EPS can also be degraded by Ag₂O/g‐C₃N₄, indicating that EPS can work as a radical scavenger to protect the algae cells. Without the protection of EPS, 97.8% of algae cells are inactivated after 5 h photocatalysis. Therefore, more attention should be given to the interaction between EPS and photocatalyst to promote the design and application of the photocatalytic.

中文翻译：

Ag2O / g-C3N4在可见光下灭活有害藻类中细胞外聚合物的影响

作为一种新兴的藻类去除技术，光催化已经引起了广泛的关注，但是灭藻性能不可避免地受到藻类产生的细胞外聚合物（EPS）的影响。在这项研究中，采用具有有效灭藻功能的光催化剂（Ag ₂ O / g-C ₃ N ₄）来研究与EPS的相互作用，并研究EPS对光催化除藻的影响。结果表明，EPS可以通过静电力粘附在Ag ₂ O / g-C ₃ N ₄的表面上。与EPS的相互作用降低了Ag ₂ O / g-C ₃ N ₄的表面Zeta电位EPS浓度增加，从7.71到-22.3 mV，最大粒径比从825增加到1281 nm。此外，与EPS的相互作用将Ag ₂ O / g-C ₃ N _4中的Ag ⁺释放抑制了一半，因此金属离子的毒性得到缓解。同时，EPS也可以被Ag ₂ O / g-C ₃ N ₄降解，表明EPS可以作为自由基清除剂来保护藻类细胞。没有EPS的保护，光催化5小时后，藻类细胞中的97.8％被灭活。因此，应更加注意EPS和光催化剂之间的相互作用，以促进光催化剂的设计和应用。

更新日期：2020-12-09

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