双酚A在消落带土壤中的吸附/解吸及降解行为

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摘要为探究双酚A (BPA)在消落带的环境行为,于涪陵清溪消落带采集不同高程土壤样品(S_L:155m,S_M:160m,S_H:165m),开展批量吸附/解吸和模拟降解实验,研究了BPA在消落带土壤中的吸附、解吸及降解行为.15℃、25℃、35℃条件下,各高程土壤对BPA的吸附等温线符合Freundlich模型,吸附能力均随温度升高而降低,并表现出一定吸附非线性.各实验温度下,消落带土壤对BPA的吸附能力均与土壤有机质含量趋势一致,随采样高程降低而增加(S_L>S_M>S_H).吸附热力学参数ΔG、ΔH和ΔS均小于0, BPA在消落带土壤中的吸附为自发、放热的熵减过程,受物理吸附主导.解吸迟滞系数HI(0.853-0.981)接近1,BPA在消落带土壤中的解吸迟滞性不明显,易于解吸释放.25℃实验条件下,BPA在消落带土壤中的降解半衰期为S_L(4.88d)<S_M(6.68d)<S_H(10.07d),落干期较长区域的土壤中BPA降解速率更低.10℃条件下,BPA在土壤S_H中的降解半衰期延长至12.01d,分别为25℃的1.19倍和35℃的1.20倍,低温条件抑制BPA的降解.

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	胡莺
	孙姣霞
	秦燕

关键词 ：双酚A, 消落带, 吸附, 解吸, 降解

Abstract：To investigate the environmental behavior of bisphenol A (BPA) in the water-level-fluctuation zone (WLFZ), soil samples were collected at different elevations (S_L: 155m, S_M: 160m, S_H: 165m) from the WLFZ in Qingxi Town, Fulin. Batch adsorption/desorption and simulated degradation experiments were conducted to study the adsorption, desorption, and degradation behaviors of BPA in these soil samples. At temperatures of 15℃, 25℃, and 35℃, the adsorption isotherms of BPA on soils at various elevations conformed to the Freundlich model, exhibiting decreased adsorption capacity with increasing temperature and showing non-linear adsorption characteristics. The adsorption capacity of BPA in soil samples followed a trend consistent with soil organic matter content, increasing as elevation decreased (S_L > S_M > S_H). The values of calculated thermodynamic data ΔG、ΔH and ΔS were all less than zero, indicating that the adsorption of BPA in tested soils was a spontaneous, exothermic process with decreased entropy, dominated by physical adsorption. The desorption hysteresis index HI (0.853-0.981) approached 1, suggesting minimal desorption hysteresis and easy release of BPA from the soils. Under 25℃, the half-life of BPA degradation in soils followed the sequence S_L (4.88d) < S_M (6.68d) < S_H (10.07d), indicating slower degradation rates in soils from long-term exposed areas. At 10℃, the half-life of BPA degradation in soil S_H extended to 12.01d, which was 1.19 and 1.20 times longer compared to 25℃ and 35℃, respectively, indicating inhibition of BPA degradation under low-temperature conditions.

Key words： bisphenol A water-level-fluctuation zone adsorption desorption degradation

收稿日期: 2024-03-20

PACS:

X131.3

基金资助:重庆市教育委员会科学技术研究项目(KJQN202000743);重庆交通大学大学生创新创业训练计划(X202310618016)

通讯作者: 胡莺,讲师,29532328@qq.com E-mail: 29532328@qq.com

作者简介: 胡莺(1982-),女,重庆人,讲师,博士,主要从事新污染物迁移转化及污染控制相关研究.发表论文20余篇.29532328@qq.com.

引用本文:

胡莺, 孙姣霞, 秦燕. 双酚A在消落带土壤中的吸附/解吸及降解行为[J]. 中国环境科学, 2024, 44(10): 5705-5713. HU Ying, SUN Jiao-xia, QIN Yan. Adsorption/desorption and degradation of bisphenol A in soils from the water-level-fluctuation zone. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(10): 5705-5713.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I10/5705

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