腐植酸对水体中五价钒的吸附.pdf

2016,35(5):969-975
农业环境科学学报
2016年5月
Journal of Agro-environment Science
刘梦,土华静,王鲲鹏,等.腐植酸对水体中五价钊的吸附母农业环境科学学报,2016,35(5):969-975
LIU Meng WANG Hua-jing. WANG Kumpen el al. Asurion o pentavalent andin y umi ai in waler J. ound fagr-ervironment Science,
016.35(5):960-975.
腐植酸对水体中五价钒的吸附
刘梦,王华静,王鲲鵰2,杨金燕2
(1.叫川师范大学地理与资源科学学院,成都610101;2.叫川大学建筑与坏境学院,成都61(0065
摘要:采用批次实验法,研究了腐植酸浓度、钒离子浓度、吸附时间、温度、溶液pH、离子强度、电解质等对腐植酸吸附水体中五价
钒的影响。结果表明,钒溶液浓度为90.91mg?.条件下,腐植酸的浓度为1.0)g?1.时,腐植酸对钒的吸附量最大。随着氓溶液浓
度的增加,吸附率逐渐降低并趋于0;而吸附量呈增加一缓慢增加-平衡的趋势;在腐植酸浓度为1.09g·L'条件下,钒溶液浓度为
1818.18mgL时,吸附量达到最大值,吸附等温线与 Langmuir模型基本吻合。随着溶液pI、温度的增加,腐植酸对钒的吸附量逐
渐减少,即在酸性、温度较低的条件下更有利于腐植对钒的吸附。随着溶液电解质浓度的増加,腐植酸对钒的吸附量逐渐降低。
红外光谱和扫描电镜的结果显示,腐植酸对钒的吸附机制为钒在腐植酸的表面和内部形成稳定的络合物,这与腐植酸的O-H(或
N-H)的氢键、C-0和C-H键的伸缩振动有关。因此,可以考虑用适量的腐植酸作吸附剂,去除水体中的钒,并调整环境条件增强
吸附效果。
关键词腐植;钒:吸附;影响困素
中图分类号:X52文献标志码:A文章编号:1672-2043(2016)05-0969-07doi:1(0.11654 /jaws.2016.05022
Adsorption of pentavalent vanadium by humic acid in water
LIU Meng. WANG Iiua-jing, WANG Kun-peng, YANG Jin-yan
(1. College of Geography and Resources Seience, Sichuan Normal University, Chengdu 610101. China: 2. College of Architecture and Envi-
ronment, Sichuan University, Chengdu 610065. China
A bstract: Vanadium(V )is released naturally and anthropogenically to the environment and becomes an important pollutant. This study is
conducted to examine adsorption characteristics of pentavalent V[V(V)] as Navo, in water by humic acid under a series of initial V con-
centrations, humic acid concentrations, adsorption time, solution PH, temperature, ionic strength, and electrolyte type and concentrations.
Results showed that: (1 )at 90.91 mg I.V(V ) the highest adsorption capacity of V was found at 1.0 gi, I of humic acid concentration
(2 )with increases of V(V )initial concentrations in solution, the adsorption rate gradually decreased, whereas the adsorption amount in
Creased and reached lhe maximum at I 818. mg.I al 1.0 g of humic acid concentration. Adsorption isotherm of V by humic acid
could be well deseribed by Langmuir model; (3 )increasing solut on PH and temperature radually reduced the adsorption amount of V by
humic acid, indicating that low temperature and low PH favored V adsorption by humic acid: (4 )increasing electrolyte concentrations sup
pressed the adsorption of V by humic acid; (5)infrared spectrum and scanning electron microscopy showed that V complex was formed on
the surface and the inside of humie acid and thal the slrelehing vibration of O-H or N
C-0 and C-H might also played role in V ad
orption. Therefore, appropriate amount of humic acid could be used to remove V in water under certain environmental conditions
Keywords: humic acid: vanadium: adsorption; influencing factors
收稿日期:2015-11-19
基金项目:四川师范大学研究生优秀论文培育基金(校研宁2015]5号-42);:国家自然科学基金项日(41101484);科技部欧盟国际科技合作
顶日(2011DFA10122
作者简介:刘梦(1988-),女,硕土研究生,主要岍究方向为水资源与水环境。E-mil:714823069 gqd 'onl
通信作者:杨金燕F-mail:yanyang(@sreu.ecdu.cn