染色质/卡拉胶复合材料高效吸附苯并蒽的特性与影响因素分析

Characteristics and Influencing Factors of Efficient Adsorption of Benzoanthracene by Chromatin/ Carrageenan Composite Materials

苯并蒽 (BaA) 是多环芳烃 (PAHs) 中最重要的污染物之一, 具有分布广泛、稳定性强、生物累积性强、致癌性强等特点, 严重危害人类健康和环境。本项研究中, 基于BaA 和DNA之间的插层结合, 我们制备了一种新型的染色质/卡拉胶复合材料, 它是一种简单有效的吸附剂, 可以有效地从水溶液中吸附BaA。在最佳条件下, 染色质/卡拉胶复合材料对BaA吸附率为94%, 吸附量为0. 0075mg·g-1, 该吸附过程受到反应时间、反应温度、pH值和复合材料剂量的影响, 其中, 高温或低温、酸性或碱性环境都会降低吸附率。然而, 随着反应时间的延长或复合材料剂量的增加, 吸附率将逐渐提高。染色质/卡拉胶复合材料去除BaA的过程更符合准二级动力学模型和Langmuir模型, 且热力学模型进一步表明该过程是自发进行的。以上结果表明, 染色质/卡拉胶复合材料可以作为吸附BaA的新型吸附剂。

Benzoanthracene (BaA) is one of the most important pollutants in polycyclic aromatic hydrocarbons ( PAHs) , with characteristics such as wide distribution, strong stability, strong bioaccumulation, and strong carcinogenicity, seriously endangering human health and the environment. In this study, a novel chromatin/carrageenan composite materials was prepared based on the intercalation binding between BaA and DNA, which is a simple and effective adsorbent that can effectively adsorb BaA from aqueous solution. Under optimal conditions, the chromatin/carrageenan composite material exhibits a BaA adsorption efficiency of 94% and an adsorption amount of 0. 0075mg·g-1. This adsorption process is influenced by reaction time, reaction temperature, pH value, and the dosage of the composite materials. Among them, high or low temperatures, acidic or alkaline environments will all reduce the adsorption efficiency. However, with the extension of reaction time or the increase of composite materials dosage, the adsorption efficiency will gradually increase. The process of removing BaA from chromatin/carrageenan composite material is more in line with pseudo-second-order kinetic model and Langmuir model, and thermodynamic model further indicated that the process is spontaneous. The above results indicate that chromatin/ carrageenan composite materials can serve as a novel adsorbent for BaA adsorption.