【摘要】 [目的]本文旨在利用天然低共熔溶剂(NADES)高效去除大米粉中重金属镉,并对其机制进行探索。[方法]以加热法合成的15种NADES为洗脱剂,采用洗脱的方式,深入探讨NADES去除大米粉中重金属镉的效果及其机制,并以2种革兰氏阳性菌(金黄色葡萄球菌和单增李斯特菌)和2种革兰氏阴性菌(沙门氏菌和大肠杆菌)为指示菌,研究NADES的毒性。同时,通过吸附动力学和吸附热力学的方法研究NADES去除重金属镉的机制。[结果]15种NADES对大米粉中镉表现出较好的去除效果,镉去除率达到51%~96%。NADES毒性试验表明,除3种有机酸基质NADES由于其过低p H值对细菌生长造成影响之外,其余12种NADES表现出良好的生物相容性。初步去除机制试验表明,Freundlich等温吸附模型和拟二级动力学模型能很好阐明NADES的吸附机制。[结论]NADES是一种能高效去除大米粉中重金属镉的新型绿色溶剂。本研究建立了一种绿色高效去除镉污染大米粉中重金属镉的方法,为其他农产品重金属去除提供了思路。更多还原

【Abstract】 [Objectives]The study aims to remove cadmium( Cd) from rice flour by natural deep eutectic solvents( NADES) with high efficiency and explore its mechanism. [Methods]15 NADES which were formed by three different base materials were synthesized and used as washing agents for Cd removing from contaminated rice flour. The effect and mechanism of Cd removing by NADES was explored in depth. Besides,the toxicities of the prepared NADES were qualitatively evaluated using two Gram-positive( Staphylococcus aureus and Listeria monocytogenes) and two Gram-negative( Escherichia coli and Salmonella enterica) bacteria. Meanwhile,the mechanism of Cd removal from rice flour by NADES was verified through adsorption kinetics and adsorption thermodynamics.[Results]Fifteen NAEDS demonstrated Cd removal(51% to 96%) from rice flour. Most of the NADES did not inhibit bacterial growth except organic acid-based NADES due to its low p H in toxicity study. Preliminary removal mechanism tests showed that Freundlich isotherm model and Pseudo-second-order adsorption kinetics could well elucidate the mechanism of the adsorption of NADES. [Conclusions]NADES is a new-type green solvent to remove heavy metal Cd efficiently from rice flour. Conclusively,this study presents a green and efficient way of removing Cd from contaminated rice and provides method for the other agricultural products.更多还原