光催化和生物降解的密切耦合对水中莠去津的降解和矿化,New Journal of Chemistry

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光催化和生物降解的密切耦合对水中莠去津的降解和矿化
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2021-06-12 , DOI: 10.1039/d1nj00134e
Linchao Zhang _{1,

2,

3,

4} , Yu Zhang _{1,

2,

3,

4} , Kefeng Xiao _{1,

2,

3,

4} , Jinsheng Shi _{1,

2,

3,

4} , Xiuxiu Du _{1,

2,

3,

4} , Lili Wang _{2,

3,

4,

5} , Xia Wu _{2,

3,

4,

6,

7}

Affiliation

阿特拉津是应用最广泛的除草剂之一，是土壤和水体的主要污染物。紧密耦合的光催化和生物降解 (ICPB) 是一种有吸引力的废水处理技术，其中微生物可以分解和矿化光催化反应产生的可生物降解中间体。一些工作研究了通过ICPB技术去除莠去津，在这项工作中设计了异质结Bi ₂ WO ₆ /CN并结合生物降解去除莠去津。Bi ₂ WO ₆ /CN通过喷粉法粘附在海绵载体的外部，然后在海绵载体的内部培养生物膜。毕₂ WO₆ /CN 异质结可以产生活性物质如·OH、空穴和·O₂^-将莠去津分解成可生物降解的中间体，这些中间体被载体内部的生物膜迅速矿化。紫外-可见光激发的Bi₂ WO₆ /CN光催化剂可以充分利用太阳能，这种异质结构可以促进光生电子-空穴对的分离，从而进一步提高·OH和·O₂^-的产生. 海绵载体不仅可以保护里面的生物膜免受紫外线和自由基的破坏，而且可以很容易地回收利用，不会产生二次污染。这项工作展示了 Bi₂的潜力WO ₆ /CN 基于 ICPB 系统，用于从实用角度降解莠去津。

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The intimate coupling of photocatalysis and biodegradation for the degradation and mineralization of atrazine in water

Atrazine is one of the most widely used herbicides and a main pollutant of soil and water bodies. Intimately coupled photocatalysis and biodegradation (ICPB) is an attractive technology for the treatment of wastewater, in which the microorganisms can decompose and mineralize the biodegradable intermediates generated by a photocatalytic reaction. A few works have investigated the removal of atrazine through ICPB technology, and in this work a heterojunction Bi₂WO₆/CN was designed and combined with biodegradation to remove atrazine. Bi₂WO₆/CN was adhered on the external section of a sponge carrier via a powder spraying method and a biofilm was then cultivated in the interior of the sponge carrier. The Bi₂WO₆/CN heterojunction can produce active species like ˙OH, holes and ˙O₂⁻ to break atrazine into biodegradable intermediates, which are quickly mineralized by biofilms in the interior of the carrier. The Bi₂WO₆/CN photocatalyst excited by UV-Vis light can take full advantage of the solar energy, and this heterostructure can facilitate the separation of photoinduced electron–hole pairs, hence further improving the generation of ˙OH and ˙O₂⁻. The sponge carrier can not only protect the biofilms inside from the damage of UV light and free radicals, but also can be easily recycled without secondary pollution. This work shows the potential of a Bi₂WO₆/CN based ICPB system for atrazine degradation from a practical point of view.

更新日期：2021-07-06

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