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Position: Home > Articles > Cadmium adsorption on goethite under effects of main inorganic anions in seawater Chinese Journal of Ecology 2008,27 (8) 1367-1372

海水中主要无机阴离子对针铁矿吸附镉的影响

作  者:
陈亮;贾永锋;张雪霞;吕洪涛;石荣
单  位:
中国科学院沈阳应用生态研究所
关键词:
镉;吸附;针铁矿;海水
摘  要:
采用人工合成针铁矿作为吸附剂,通过序批式试验,研究了pH值以及海水中主要无机阴离子Cl-、SO42-、NO3-和HCO3-对Cd吸附的影响。结果表明:随pH值升高,针铁矿对Cd的吸附量显著增加;Cl-、SO42-和NO3-在pH8时抑制针铁矿对Cd的吸附;Cl-和SO42-在低pH值条件下促进Cd的吸附;HCO3-在pH4~10范围内促进Cd吸附;pH8时,SO42-与Cd加入顺序的不同对吸附结果具有显著影响,先加入Cd时,Cd的吸附量明显大于先加入SO42-和Cd-、SO42-同时加入时Cd的吸附量。
译  名:
Cadmium adsorption on goethite under effects of main inorganic anions in seawater
作  者:
CHEN Liang1,2, JIA Yong-feng1, ZHANG Xue-xia1,2, L Hong-tao1,2, SHI Rong1,2 (1Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2Graduate University of Chinese Academy of Sciences, Beijing 100039, China).
关键词:
cadmium; adsorption; goethite; seawater.
摘  要:
Batch adsorption experiment was conducted to study the effects of seawater pH, Cl-, SO42-, NO3-and HCO3-on the adsorption of cadmium on goethite. It was found that cadmium adsorption on goethite was highly pH dependent. The cadmium adsorption was suppressed by Cl-, SO42-and NO3-at pH 8, but enhanced by Cl-and SO42-at low pH. HCO3-promoted the cadmium adsorption at pH 4-10. The order of cadmium and SO42-addition at pH 8 was found to strongly affect the adsorbed amount of cadmium. Much larger amount of cadmium was adsorbed on goethite when cadmium was added first, compared to the conditions when SO42-was added first or when cadmium and SO42-were added simultaneously.

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