Immobilization of Phenazine-1-carboxylic Acid on Chitosan/Polyvinyl Alcohol Gel and its Enhancement Effect on the Decolorization of Disperse Red S-R by Shewanella oneidensis

IF 4.3 3区材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

ACS Applied Electronic Materials Pub Date : 2024-10-31 DOI:10.1007/s11270-024-07572-w

Yanbo Li, Guohong Liu, Huai Shi

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Abstract

Soluble electron shuttles have been found to facilitate the biodecolorization of azo dyes, yet their loss due to water flow can escalate costs and risk secondary pollution. This issue can be mitigated by immobilizing the shuttles. In this study, we immobilized phenazine-1-carboxylic acid (PCA) using a chitosan/polyvinyl alcohol gel carrier and investigated its effect on the degradation of disperse red S-R (DR S-R) by Shewanella oneidensis FJAT-2478. Both free and immobilized PCA significantly increased the decolorization rate within a 50–400 mg/L concentration range for DR S-R, without affecting the final efficiency. Immobilized PCA was slightly less effective than free PCA (4.18-fold at 100 mg/L DR S-R), but was 3.63-fold more effective than the control group without PCA. It also demonstrated excellent reusability, retaining 83% of its initial activity after 10 cycles. Unlike free PCA, which reduced flavin secretion of FJAT-2478 by 36.4%, immobilized PCA increased it by 19.5%, indicating potential differences in their electron transfer modes. This study highlights the potential of immobilized phenazine-based electron shuttles in biologically decolorizing disperse dye wastewater.

Graphical Abstract

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壳聚糖/聚乙烯醇凝胶上吩嗪-1-羧酸的固定化及其对 Shewanella oneidensis 对分散红 S-R 脱色的促进作用

研究发现，可溶性电子梭能促进偶氮染料的生物脱色，但水流会导致电子梭的损失，从而增加成本并带来二次污染的风险。固定电子梭可以缓解这一问题。在本研究中，我们使用壳聚糖/聚乙烯醇凝胶载体固定了酚嗪-1-羧酸（PCA），并研究了其对 Shewanella oneidensis FJAT-2478 降解分散红 S-R （DR S-R）的影响。在 50-400 mg/L 的浓度范围内，游离和固定化 PCA 都能显著提高 DR S-R 的脱色率，但不影响最终效率。固定化五氯苯甲醚的脱色效果略低于游离五氯苯甲醚（在 100 毫克/升 DR S-R 浓度下为 4.18 倍），但比不含五氯苯甲醚的对照组高出 3.63 倍。它还表现出极佳的重复使用性，在 10 个周期后仍能保持 83% 的初始活性。游离 PCA 会使 FJAT-2478 的黄素分泌减少 36.4%，而固定 PCA 则会使其分泌增加 19.5%，这表明它们的电子传递模式可能存在差异。本研究强调了固定化酚嗪基电子梭子在分散染料废水生物脱色方面的潜力。图文摘要

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来源期刊

ACS Applied Electronic Materials Multiple-

CiteScore

7.20

自引率

4.30%

发文量

567