黑碳对土壤中农药呋喃丹吸附与解吸行为的影响  

Effect of black carbon on the absorption and desorption behavior of carbofuran in the soil

作　　者：杨小兵 陶然[2] 

机构地区：[1]东江环保股份有限公司,广东深圳518104 [2]暨南大学水生生物研究中心,广州510632

出　　处：《安全与环境学报》2015年第5期306-309,共4页Journal of Safety and Environment

基　　金：国家自然科学基金项目(41201506)

摘　　要：为了考察黑碳对土壤中呋喃丹吸附与解吸行为的影响,选取小麦秸秆,分别在250℃、450℃和850℃下制备黑碳,测定了黑碳的比表面积和孔体积;采用批处理振荡法测定了呋喃丹在人工添加黑碳土壤中的吸附-解吸行为。结果表明,随制备温度升高,黑碳的比表面积、孔体积和微孔率增大;人工添加黑碳的土壤对呋喃丹的吸附容量和吸附强度随黑碳添加量增加而逐步增加,吸附和解吸等温线的非线性也逐步明显。添加高温制备黑碳的土壤比添加低温制备黑碳的土壤吸附容量、吸附和解吸的非线性均增加。吸附农药的解吸迟滞作用与土壤中黑碳的质量分数密切相关,添加高温制备黑碳的土壤解吸迟滞现象明显。因此,土壤中添加黑碳在一定程度上保证了土壤使用的安全性。The paper is aimed at presenting its study findings on the effects of the black carbon on the absorption and desorption of carbofuran in the soil,with its particular sign of the desorption hysteresis index HI. As is known,the so-called black carbon is derived from the incomplete combustion of vegetation,which is ubiquitous and essentially beneficial for the sequestration of the environmental contaminants. In hoping to reduce such negative effects,we have first of all made an exploration of such effects while managing to produce the black carbon through burning wheat straw at different temperatures（ 250 ℃,450 ℃,850 ℃）.And,then,we have examined the BET specific surface areas,with the black carbon mixed into the soil in different ratios.Here,we have discovered that the absorption and desorption behaviors of carbofuran in the said soil can be determined via the batch equilibrium. To be exact,since the absorption and desorption isotherms were found fit linearly for the Freundlich equation,it would be possible to use the ratio of the absorption Freundlich exponent coefficient and that of the desorption to indicate the degree of the absorption / desorption hysteresis. On the other hand,the specific surface area of the black carbon tends to increase with the increase of the experimental temperature（ e. g. BC450 with SSA（ Specific Surface Area） of 24. 7 m2/ g and micropores proportion of 6. 9%; BC850 with SSA of 171. 8 m2/ g and micropores proportion of 16. 8%）,the absorption capacity of the soil added artificially with the black carbon has also been found raised proportionally with the rate of the black carbon,whose contribution to the absorption for the carbofuran under the various BC contents in the soil should be paid special attention to. What is more,since the Freundlich absorption coefficient Kfwas found increased from 0. 78 to 26. 79,the other Freundlich coefficient,i. e. N,tends to reveal a non-linear nature of the adsorption isotherm decrease from 0. 903 to 0. 659,which implies that the content

关 键 词：环境工程学 呋喃丹 黑碳 土壤 吸附/解吸 迟滞作用 

分 类 号：X53[环境科学与工程—环境工程]