两种盐复合改性活性氧化铝对水中氟的吸附特性.pdf

文档介绍：第卷第期环境化学
33 11 Vol. 33, No. 11
年月
2014 11 ENVIRONMENTAL CHEMISTRY November 2014
DOI / ⁃
:
两种盐复合改性活性氧化铝对水中氟的吸附特性∗
段颖杨琰琰张小凤王晨晨徐微李学德∗∗

安徽农业大学资源与环境学院农业部合肥农业环境科学观测实验站合肥
( , , , 230036)
摘要采用和两种盐对活性氧化铝进行改性通过静态吸附实验研究了改性活性氧
Fe2(SO4 ) 3 Al2(SO4 ) 3 , ,
化铝对水中氟离子的吸附特性及影响因素改性后的活性氧化铝吸附容量显著提高下吸附容量达到
. ,25 ℃
-1 改性活性氧化铝对氟的吸附动力学符合拟二级动力学模型吸附等温线更符合等温吸
6􀆰 25 mg·g . , Langmuir
附规律吸附过程 G0 H0 S0 表明改性吸附剂对氟的吸附是自发的是吸热熵增加的反应吸附
. Δ<0、Δ>0、Δ>0, , 、.
最佳值为吸附过程中共存 3- 对吸附效果影响最大
pH 6, , PO4 .
关键词改性活性氧化铝氟吸附动力学热力学
, , , , .
Adsorption characteristics of floride on activated alumina
modified with ferric and aluminum salt
DUAN Ying YANG Yanyan ZHANG Xiaofeng WANG Chenchen XU Wei LI Xuede∗∗

(School of Resource and Environment, Anhui Agricultural University; Observation Station of the
Agri⁃environment in Hefei, Ministry of Agriculture, Hefei, 230036, China)
Abstract
: Activated alumina was modified with Fe2 ( SO4 ) 3 and Al2 ( SO4 ) 3 in this study. The
-1
maximum sorption capacity of modified activated alumina for fluoride was mg·g at 298 K,
significantly higher than the unmodified absorbent. The fluoride adsorption ics on the modified
activated alumina was well described by the pseudo⁃second⁃order ic model. The fluoride
adsorption on the modified activated alumina was consistent with the Langmuir model. Duri