| 紫色土对硫丹的吸附与解吸特征 |
| 摘要点击 3169 全文点击 1502 投稿时间：2014-11-20 修订日期：2015-04-18 |
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| 中文关键词 紫色土 硫丹 持久性有机污染物 吸附 解吸 |
| 英文关键词 purple soil endosulfan persistent organic pollutant adsorption desorption |
| 作者 | 单位 | E-mail | | 赵炎 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | safzy5@swu.edu.cn | | 郑国灿 | 重庆出入境检验检疫局, 重庆 400020 | | | 朱恒 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | | | 张进忠 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715
重庆市农业资源与环境重点实验室, 重庆 400716 | jzhzhang@swu.edu.cn | | 朱秀英 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | | | 胡淑春 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | | | 吴娅林 | 西南大学资源环境学院, 三峡库区生态环境教育部重点实验室, 重庆 400715 | |
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| 中文摘要 |
| 为揭示硫丹在紫色土中的残留过程、保护土壤生态环境,采用静态吸附和解吸实验,研究了紫色土对硫丹的吸附与解吸特征,考察了温度、吸附剂用量和吸附液初始pH等因素对吸附量的影响. 结果表明紫色土对硫丹的吸附动力学过程可以用二级动力学方程很好地描述,获得α-, β-硫丹的初始吸附速率常数分别为0.157 mg ·(g ·min)-1和0.115 mg ·(g ·min)-1; 吸附热力学过程可以用Langmuir等温吸附模型很好地描述,获得α-, β-硫丹的最大吸附量分别为0.257 mg ·g-1和0.155 mg ·g-1,紫色土吸附硫丹是放热的物理化学过程,但以物理吸附为主. 在本研究所设条件下,吸附液初始pH对吸附量的影响较大,温度和吸附剂用量的影响相对较小. 解吸实验发现,紫色土吸附的α-, β-硫丹分别在6和4 h时达到最大解吸量(0.029 mg ·g-1和0.017 mg ·g-1),分别占最大吸附量的10.5%和16.1%. |
| 英文摘要 |
| In order to reveal the residual process of endosulfan in purple soil and protect soil ecological environment, the adsorption and desorption characteristics of endosulfan in purple soil were investigated, and effects of temperature, adsorbent amount, and initial pH of adsorption solution on the adsorption capacity were also examined by static adsorption and desorption experiments. The results showed that the adsorption kinetic process could be well described by the second-order kinetic equation with the initial rate constants of α-, β-endosulfan as 0.157 and 0.115 mg ·(g ·min)-1, respectively. The adsorption thermodynamic process could be well described by the Langmuir isotherm with the maximum adsorption capacities of α-, β-endosulfan as 0.257 mg ·g-1 and 0.155 mg ·g-1, respectively. The adsorption process of endosulfan in purple soil may be an exothermic physicochemical process, and is dominated by physical adsorption. Under the experimental conditions examined in this study, the initial pH of adsorption solution had a relative great influence on the adsorption capacity, whereas the temperature and adsorbent amount had no significant influence. The desorption experiments found that the maximum desorption capacities of α-, β-endosulfan adsorbed in purple soil were 0.029 mg ·g-1 and 0.017 mg ·g-1 at 6 and 4 h, and accounted for 10.5% and 16.1% in the maximum adsorption capacities, respectively. |
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