首页|福寿螺螺壳对水溶液中Pb2+的去除及其机理

福寿螺螺壳对水溶液中Pb2+的去除及其机理

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  • 国家科技期刊平台
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福寿螺是世界100种恶性外来入侵物种之一.本研究探索了福寿螺螺壳作为吸附材料去除水溶液中Pb2+的特性和机理.结果表明,螺壳粉末对Pb2+的去除率与粉末用量、Pb2+初始浓度、溶液pH值和反应时间有关,水温对其去除率影响不大.Langumir模型拟合结果表明,螺壳粉末对Pb2+的吸附容量为89.29 mg·g-1.扫描电镜分析表明,螺壳粉末去除Pb2+的过程主要发生在其表面,小颗粒反应活跃.X射线衍射图谱表明,被吸附的Pb2+以PbCO3的形式存在于螺壳粉末中,去除Pb2+的机理可能是消耗螺壳中方解石和文石时的离子交换和沉淀反应.研究表明,福寿螺螺壳可成为一种有效的重金属Pb2+吸附剂.
Lead removal from aqueous solution by the shell of golden apple snail and related mechanisms
Golden apple snail is one of the 100 pernicious alien invasive species in the world. In this study, the shell powder of golden apple snail was used as the adsorbent to approach its char-acteristics and mechanisms of lead (Pb2+) removal from aqueous solution under laboratory condi-tion. It was found that the removal rate of Pb2+ by the shell powder was related to the shell pow-der amount, initial Pb2+ concentration, solution pH, and reaction time, while solution tempera-ture had lesser effects. The fitting of Langumir model indicated that the Pb2+ adsorption capacity of the shell powder was 89. 29 mg·g-1. The analysis of scanning electron microscopy showed that the Pb2+ removal process was mainly happened at the surface of the powder, and small parti-cle was more active. The X-ray diffraction indicated that the adsorbed Pb2+ was in the form of PbCO3 existing on the powder. The mechanisms of the Pb2+ removal could be the ion exchange and precipitation on the aragonite and calcite in the powder. It was suggested that the shell of golden apple snail could be used as an effective bio- adsorbent for Pb2+ removal.

golden apple snailsnail shellPb2+scanning electron microscopy, X-ray diffrac-tion

赵本良、彭卉、章家恩、戴晓燕、彭莉

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华南农业大学热带亚热带生态研究所,广州510642

华南农业大学农业部生态农业重点开放实验室,广州510642

广东省高等学校农业生态与农村环境重点实验室,广州510642

福寿螺 螺壳 Pb2+ 扫描电镜 X射线衍射

国家自然科学基金国家自然科学基金广东省科技计划项目广东省高等学校高层次人才项目广东省引进国(境)外高层次人才智力项目

U113100630770403和309001872007B020709007粤教师函[2010]79号粤外专[2010]51号

2013

生态学杂志
中国生态学学会

生态学杂志

CSTPCDCSCD北大核心
影响因子：1.439
ISSN：1000-4890
年,卷(期)：2013.32(1)
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