Abstract

Cr(VI) is one of the most common environmental pollutants. The non-biodegradable Cr(VI) in aqueous solution accumulates along the food chain and damages the health of plant, animal, and human. In this study, solid-state fermentation technology was used to treat Caulis lonicerae residue to improve its adsorption capacity for Cr(VI). Caulis lonicerae can be used to extract the active ingredients such as organic acids, flavonoids, and triterpenoid saponins that have various effects including anti-oxidation and immune boosting. However, there is no proper treatment for large amount of residue left after extraction. The Phanerochaete chrysosporium was inoculated into the residue for solid-state fermentation, and the adsorption capacity of C. lonicerae residue before (CLr) and after fermentation (FCLr) regarding Cr(VI) adsorption was compared. In the range of 40–120 mg/L Cr(VI), the adsorption capacity of FCLr was significantly higher than that of CLr. The scanning electron microscopy (SEM) results exhibited a rougher surface of FCLr. The Fourier-transform infrared spectroscopy (FTIR) results revealed that the structure of FCLr was affected by the combination of Cr(VI), and the multiple functional groups interacted with Cr(VI) (such as –OH, C–H, C = O, C–O–C, and C–O). The adsorption capacity could reach 48.91 mg/g and the Cr(VI) removal percentage may reach 98.07% for FCLr increased by 28.24% through fermentation.

摘要

Cr(VI)是最常见的环境污染物之一。水溶液中不可生物降解的 Cr(VI) 在食物链中积累，危害植物、动物和人类的健康。本研究采用固态发酵技术处理金银花残渣，提高其对Cr(VI)的吸附能力。金银花可提取有机酸、黄酮、三萜皂甙等活性成分，具有抗氧化、增强免疫等多种功效。然而，对于提取后留下的大量残留物，没有适当的处理方法。将黄孢原毛菌接种到残渣中进行固态发酵，对金银花的吸附能力比较了发酵前 (CLr) 和发酵后 (FCLr) 对 Cr(VI) 吸附的残留量。在40-120 mg/L Cr(VI)范围内，FCLr的吸附能力明显高于CLr。扫描电子显微镜 (SEM) 结果显示 FCLr 的表面更粗糙。傅里叶变换红外光谱 (FTIR) 结果表明，FCLr 的结构受 Cr(VI) 组合的影响，多个官能团与 Cr(VI) 相互作用（如 -OH、C-H、C = O、C–O–C 和 C–O)。FCLr通过发酵提高了28.24%，吸附量可达48.91 mg/g，Cr(VI)去除率可达98.07%。