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土壤酸化作用对磺胺氯哒嗪吸附行为的影响
曾庆辉, 王雨薇, 李 莉
吉林农业大学资源与环境学院
摘要:
参照 OECD guideline 106 批平衡方法研究酸化作用对磺胺氯哒嗪在黑土中的吸附动力学、吸附热力学以及有机质和离子强度对其吸附的影响。结果显示:酸化作用下磺胺氯哒嗪在黑土中吸附平衡时间为12 h,准二级动力学方程拟合的酸化黑土中的吸附速率常数(k2)为216.2755 mg/(g·h),大于对照黑土中的15.7222 mg/(g·h);从吸附热力学结果看,酸化作用明显提高磺胺氯哒嗪与黑土的结合能力,其吸附量与温度呈负相关;从吸附自由能(ΔG)结果看,其吸附过程是以物理吸附为主的自发反应,但酸化作用使|ΔG|增大,体系更稳定且更易进行自发反应;添加有机质可以增加黑土对磺胺氯哒嗪的吸附,但在酸化黑土中增加效果不如对照黑土;磺胺氯哒嗪在黑土中的吸附能力随背景溶液Ca2+ 浓度增大而减小,酸化作用下使其与Ca2+ 产生竞争关系,离子浓度越大竞争能力越强,黑土对磺胺氯哒嗪的吸附量则越少。
关键词:  磺胺氯哒嗪  酸化作用  黑土  吸附  有机质  Ca2+
DOI:10.13758/j.cnki.tr.2019.02.021
分类号:X53
基金项目:吉林省科技发展计划项目(20160204025SF)和国家重点研发计划项目(2017YFD0801104)资助。
Effect of Acidification on Adsorption Behavior of Sulfachloropyridazine(SCP) by Black Soil
ZENG Qinghui, WANG Yuwei, LI Li
College of Resources and Environment Science,Jilin Agricultural University
Abstract:
The adsorption kinetics, adsorption thermodynamics and the effects of organic matter and ionic strength on the adsorption of sulfachlorpyridazine (SCP) by black soil were studied according to OECD guideline 106. The results showed that the equilibrium time of SCP adsorption by black soil was 12 h under the effect of acidification, the fitting constant (k2) of adsorption rate of quasi two order kinetic equation was 216.275 5 mg/(g·h) for acidified black soil, higher than that of the control black soil, which was 15.722 2 mg/(g·h). The results of adsorption thermodynamics showed acidification significantly improved the binding capacity of SCP and soil, the adsorption capacity was negatively correlated with temperature. The adsorption free energy (ΔG) showed that the adsorption process was spontaneous reaction mainly by physical adsorption, but acidification increased |ΔG|, which made the system more stable and easier to spontaneous reaction. Adding organic matter increased the SCP adsorption more by the control black soil than acidified black soil. Adsorption capacity of SCP by black soil was decreased with the increase of Ca2+ concentration in background solution, which was attributed to the competition between SCP and Ca2+ under acidification.
Key words:  Sulfachloropyridazine (SCP)  Acidification  Black soil  Adsorption  Organic matter  Ca2+

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