双酚A在消落带土壤中的吸附/解吸及降解行为  

Adsorption/desorption and degradation of bisphenol A in soils from the water-level-fluctuation zone

作　　者：胡莺[1,2,3] 孙姣霞[1,2,3] 秦燕[1,2,3] HU Ying;SUN Jiao-xia;QIN Yan(Hehai College,Chongqing Jiaotong University,Chongqing 400074,China;Environmental Water Conservancy Engineering Laboratory,Chongqing Jiaotong University,Chongqing 400074,China;Inland Waterway Regulation Technology Transportation Industry Key Laboratory,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学河海学院,重庆400074 [2]重庆交通大学环境水利工程重庆市工程实验室,重庆400074 [3]重庆交通大学,内河航道整治技术交通行业重点实验室,重庆400074

出　　处：《中国环境科学》2024年第10期5705-5713,共9页China Environmental Science

基　　金：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)。

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.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 dataΔG、ΔH andΔS 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.

关 键 词：双酚A 消落带 吸附 解吸 降解 

分 类 号：X131.3[环境科学与工程—环境科学]