【作者】 Jin Chul Joo； Charles D.Shackelford； Kenneth F.Reardon； 徐景芳； 冯娜； 盖希坤； 乔英云；

【Author】 Jin Chul Joo~1,Charles D.Shackelford~1,Kenneth F.Reardon~1 write Xu Jingfang,Feng Na,Gai Xikun,Qiao Yingyun translate (1 Colorado State University,Fort Collins,80523 2 Chemical and Environmental Engineering Academy,SDUST,Qingdao,266510)

【机构】 美国科罗拉多州大学； 山东科技大学化工学院；

【摘要】 腐植酸与土壤表面矿物质结合能够显著的改善土壤的物化性能,由此影响矿物表面的有机污染物的迁移转化。由于不同的矿物表面对有机污染物吸附—解吸量不同,本文采用空白沙粒、负载α-FeO（OH）的沙粒（FES）和负载Al₂O₃的沙粒（ALS）3种模型吸附剂在pH为2的条件下对地面腐植酸进行评价。通过扫描电镜/能谱仪和光电子能谱分析,结果显示负载金属（氢）氧化物的石英矿物颗粒上吸附的腐植酸膜相对均匀、稳定。2个负载金属（氢）氧化物的沙粒均具有较强的滞后效应,而空白沙粒滞的后效应较弱,这表明腐植酸在模型吸附剂上的吸附解吸依赖于腐植酸和吸附利的表面元素之间的相互作用及亲和力。腐植酸分子在负载金属（氢）氧化物的沙粒上的吸附是由低分子量腐植酸组分的配体交换和高分子量腐植酸组分的疏水作用,说明考察腐植酸吸附动力学及腐植酸亚组分之间吸附解吸作用具有重要意义。更多还原

【Abstract】 Mineral-bound humic acid（HA）can significantly modify the physicochemical properties of the mineral surfaces and vice versa,thereby influencing the fate and transport of organic pollutants in the subsurface.The effect of various mineral surfaces on the adsorption-desorption of dissolved bulk,terrestrial HA was evaluated using three model sorbents[uncoated,α-FeO（OH）-coated,and Al₂O₃-coated sands]at two equilibrium pH values.The results of SEM/EDS and XPS analyses revealed relatively uniform and stable metal（hydr）oxide coating on quartz surface and the presence of he HA coating.Strong hysteresis effects were observed for both metal（hydr）oxide coated sands whereas a weaker hysteresis effect was observed for uncoated sand,suggesting that the adsorption-desorption of HA to model sorbents is dependent on the affinity of chemical interactions between the HA and surface composition of model sorbents.Adsorption of HA molecules onto metal（hydr）oxide-coated fractions,illustrating that both kinetic and fractional adsorptiondesorption of HA subcomponents are important considerations.更多还原