五氯酚钠在黄土性土壤中的吸附与解吸.pdf

第43卷第5期
应用化工
Vol 43 No 5
014年5月
Applied Chemical Industr
May 20
五氯酚钠在黄土性士壤中的吸附与解吸
李扬2,李梦耀2,袁胜·,郭印丽…2,钱会
(1.长安大学环境科学与工程学院,陕西西安710054;
2.长安大学陕西省地下水与生态环境工程研究中心,陕西西安710054)
摘要:采用静态与动态两种方法,探究了淀积层黄土中五氯酚钠(PCP-Na)的吸附和解吸特性。结果表明,
PCP-Na在淀积层黄土中的静态吸附平衡时间为2.5h,吸附速率为21.4mg/(kg?b),吸附量为53.6mg/kg。
pH4~7,对淀积层黄土中PCP-Na的吸附有影响,但影响不大;氯化钠浓度0~0.4mol/L,PCP-Na的吸附量与离子
强度呈正比。在实验温度下,吸附等温线均为L型。淀积层黄土中PCP-Na的动态吸附结果表明,当流出液体积大
于750mL时,PCP-Na在土柱内的吸附达到饱和;吸附饱和的土柱放置2h以后,用蒸馏水解吸,当解吸液流出体积
超过800mL时,流出液中几乎无PCP-Na。由此可见,淀积层黄土对水溶性PCP-Na的滞留能力较差,PCP-Na可轻
易穿过黄土,对地下水造成不可避免地污染。
关键词:五氯酚钠;黄土性土壤;吸附;解吸
中图分类号:TQ451;0657.32文献标识码:A文章编号:1671-3206(2014)05-0880-03
Adsorption and desorption of sodium pentachlorophenol
in the loessial soil
LI Yang, LI Meng-yao, YUAN Sheng, GUO Yin-li, QIAN Hui 2
( I. School of Environmental Science and Engineering, Chang'an University, Xi an 710054, China: 2. Engineering Research
Center of Groundwater and Eco-environment of Shaanxi Province, Chang "an University, Xi'an 710054, China)
Abstract: The adsorption/desorption properties and laws of PCP-NA in the loess have been ascertained b
combination of static and dynamic m ho The results showed that static adsorption time of PCP-NA in the
loess is 2. 5 h, the adsorption rate is 21. 4 mg/(kg.h) and the constant of adsorption quantity is
53.6 mg/kg. The adsorption quantity of sodium pentachlorophenol in the loess could be affected by PH in
the range of 4-7, but not obviously. The concentration of Nacl in 0-0. 4 mol/L, adsorption quantity of
PCP-NA increases with the increase of ionic strength. Under all test temperatures, adsorption isotherm
types are based on L-type, respectively. The results of dynamic adsorption showed that the adsorption
quantity of PCP-NA reached saturation in the soil column, when the effluent volumes were greater than
750 ml. The adsorption saturated soil column were placed for 2 h before desorbed by distilled water
When the volumes of desorption were more than 800 ml, there was almost no PCP-NA in effluent. The lo
ess soil has not a function for the enrichment of PCP-NA penetrates the loess soil easily. Inevitably, the
groundwater will be contaminated by the PCP-NA
Key words: sodium pentachlorophenol; loessial soil; adsorption; desorption
五氯酚钠(PCP-Na)是一种非选择性接触型脱产量达到5.0万t。我国五氯苯酚及其钠盐的年
叶剂、除草剂、木材防腐剂,还可杀灭血吸虫的宿主产量达到1.0万t,约占到全球总产量的1/5,已然
钉螺,以达到防治血吸虫病的目的。五氯酚钠的成为目前世界上最大的五氯酚钠生产和消费大
化学性质比较稳定,在环境中不易降解,从而导致环国4,并且其中绝大部分五氯酚钠进入到环境,同
境中的五氯酚钠大量富集。由于五氯酚钠的毒时在环境体系中迁移转化,对环境造成的影响不可
性较强,因此在许多国家被列为优先控制污染物。小觑。
据 Crosby的报道,1980年在世界范围内五氯苯酚的
黄土性土壤是以黄土作为母质形成的肥沃土
收稿日期:2013-12-17
作者简介:李扬(1991-),女,北京人,长安大学在读硕士研究生,师从李梦耀教授,从事应用化学方面研究。电话:
15829905274,E-mail:liy616@163.com