Abstract：
Grass carp intestinal waste-mediated biosynthesized nanosilver (AgNPs) was valorized using guaran and zeolite matrices, resulting in AgNPs-guaran, AgNPs-zeolite, and AgNPs-guaran -zeolite composites. The valorized products were examined using Environmental Scanning Electron Microscopy, Energy Dispersive X-ray analysis and X-ray Diffraction analysis to confirm uniform dispersion and entrapment of AgNPs within the matrixes. These valorized products were evaluated for their efficacy in detoxifying the ubiquitous and toxic hexavalent chromium (Cr6+) in aquatic environments, with Anabas testudineus exposed to 2 mg l-1 of Cr6+ for 60 days. Remarkable reduction of Cr6+ concentration to 0.86 ± 0.007 mg l-1 was achieved with AgNPs-guaran-zeolite composite, indicating successful reclamation of contaminated water and food safety assurance. Consistency in results was further corroborated by minimal stress-related alterations in fish physiological parameters and integrated biomarker response within the experimental group treated with the AgNPs-guaran-zeolite composite. Despite observed chromium accumulation in fish tissues, evidence of physiological stability was apparent, potentially attributable to trivalent chromium accumulation, serving as an essential nutrient for the fish. Additionally, the challenge study involving Anabas testudineus exposed to Aeromonas hydrophila exhibited the lowest cumulative mortality (11.11%) and highest survival rate (87.5%) within the same experimental group. The current study presents a novel approach encompassing the valorization of AgNPs for Cr6+ detoxification under neutral to alkaline pH conditions, offering a comprehensive framework for environmental remediation.
摘要：
使用guaran和沸石基质对草鱼肠道废物介导的生物合成纳米银（AgNPs）进行了增值，导致AgNPs-guaran，AgNP-沸石，和AgNP-guaran-沸石复合材料。使用环境扫描电子显微镜检查有价值的产品，能量色散X射线分析和X射线衍射分析以确认AgNP在基质内的均匀分散和截留。评估了这些含价产品对水生环境中普遍存在的有毒六价铬（Cr6）的解毒功效，将Anabastestimineus暴露于2mgl-1的Cr6中60天。使用AgNPs-guaran-沸石复合材料可将Cr6浓度显着降低至0.86±0.007mgl-1，表明成功回收受污染的水和食品安全保证。在用AgNP-guaran-沸石复合材料处理的实验组中，鱼类生理参数的最小应激相关变化和综合生物标志物反应进一步证实了结果的一致性。尽管观察到铬在鱼组织中积累，生理稳定性的证据很明显，可能归因于三价铬的积累，作为鱼类的必需营养素。此外,在同一实验组中,涉及暴露于嗜水气单胞菌的Anabastestudineus的攻击研究显示出最低的累积死亡率(11.11%)和最高的存活率(87.5%).目前的研究提出了一种新的方法，包括在中性至碱性pH条件下对Cr6+进行解毒的AgNPs的增值。提供环境修复的全面框架。
