Bactericidal process and practicability for environmental water sterilization by solar-light-driven Bi2WO6-based photocatalyst
Bactericidal process and practicability for environmental water sterilization by solar-light-driven Bi2WO6-based photocatalyst
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DOI：
10.1016/j.jwpe.2022.102713
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发表时间：
2022-06
影响因子：
7
通讯作者：
J. Ming;N. Liu;Qiansu Ma;Aditya Sharma;Xiangli Sun;N. Kawazoe;Guoping Chen;Yingnan Yang
中科院分区：
文献类型：
--
作者：
J. Ming;N. Liu;Qiansu Ma;Aditya Sharma;Xiangli Sun;N. Kawazoe;Guoping Chen;Yingnan Yang
病原微生物一直是人类健康的主要威胁，它可导致传染病甚至大规模死亡。本研究首次将太阳光驱动的Ag/Ag 2 O/BiPO 4/Bi 2 WO 6光催化剂用于水消毒。结果表明，Ag/Ag 2 O/BiPO 4/Bi 2 WO 6复合材料在光照下20 min即可完全灭活7.40 log 10 cfu/mLE的大肠杆菌。从抗氧化酶、细胞膜、细胞内组分和参与消毒过程的活性物种等方面系统地探讨了其灭活机理。在消毒的早期阶段，抗氧化系统被启动，并增加酶的活性，以对抗氧化攻击。不幸的是，随着氧化损伤的积累，抗氧化酶的活性受到抑制，导致防御系统的恶化。防御系统被破坏后，细胞膜逐渐被破坏，通过K+渗漏和显微图像监测。此外，细胞膜的严重破坏导致核酸和蛋白质的泄漏，表明细菌的不可逆死亡。光生活性物种包括超氧自由基和空穴在杀菌过程中起主要作用。此外，该复合材料在包括光照强度、温度、pH和腐殖酸在内的广泛的环境因素下表现出对水消毒的高度适应性。在连续的消毒实验中，Ag+的轻微释放（<0.1 mg/L）和光催化剂的高稳定性进一步暗示了其巨大的应用潜力。本文介绍了一种高效的太阳光催化剂Ag/Ag 2 O/BiPO 4/Bi 2 WO 6，该催化剂具有良好的应用前景，希望为水消毒提供更多有用的信息。
Pathogenic microorganism has always been a major threat to human health, which results in infectious diseases and even massive death. In the present study, the solar-light-driven photocatalyst Ag/Ag2O/BiPO4/Bi2WO6was firstly used for water disinfection. The results showed the Ag/Ag2O/BiPO4/Bi2WO6composite completely inactivated 7.40 log10cfu/mLEscherichia coliwithin only 20 min under light irradiation. The inactivation mechanism was systematically investigated from the antioxidant enzymes, cell membrane, intracellular components and active species involved in the disinfection process. At the early stage of disinfection, the antioxidant system was initiated and increased enzyme activities to fight oxidative attack. Unfortunately, with accumulation of oxidative damage, the activities of antioxidant enzymes were suppressed, leading to deterioration of defense system. After destruction of defense system, cell membrane was destroyed gradually, monitored by K+leakage and microscopic images. Furthermore, severe destruction of cell membrane led to leakage of nucleic acid and proteins, suggesting the irreversible death of bacteria. The photogenerated active species including superoxide radicals and holes played major roles in bactericidal process. In addition, the composite exhibited high adaptability for water disinfection at a wide range of environmental factors including light intensity, temperature, pH and humic acid. The slight release of Ag+(<0.1 mg/L) and high stability of photocatalysts during successive disinfection experiments further implied its great potential for application. This work introduced an efficient solar-light-driven photocatalyst Ag/Ag2O/BiPO4/Bi2WO6, which exhibited a promising prospect for practical application, in hope of providing more useful information for water disinfection.