| 改性铁覆膜砂的制备及吸附性能研究 |
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| 引用本文： | 何利华,梁咏梅,仇荣亮.改性铁覆膜砂的制备及吸附性能研究[J].环境工程学报,2009,3(1):113-118. |
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| 作者姓名： | 何利华 梁咏梅 仇荣亮 |
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| 作者单位： | 1. 中山大学环境科学与工程学院,广州,510275;河源市环境保护技术中心,河源,517000
2. 中山大学环境科学与工程学院,广州,510275 |
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| 摘 要： | 制备了4种改性铁覆膜砂,并对其吸附性能进行了全面的实验,分析比较了4种改性剂的作用和效果.实验中发现,添加改性剂对铁覆膜砂吸附性能的促进作用各不相同,改性剂和铁氧化物的性质共同决定了改性铁覆膜砂的性质.吸附等温线和连续动态过滤实验结果表明,活性炭和硅藻土对提高铁覆膜砂吸附性能有促进作用,但膨润土和粉煤灰的作用不明显,甚至还可能降低吸附容量.活性炭改性铁覆膜砂的吸附等温式符合Langmuir模型,硅藻土改性铁覆膜砂、膨润土改性铁覆膜砂和粉煤灰改性铁覆膜砂对Langmuir模型和Freundlich模型都有较好的相关性.改性铁覆膜砂对天然有机物(NOM)的吸附属于单分子层吸附,吸附的主要机理为静电相互作用、配位交换-表面络合作用和疏水/憎水作用等.溶液pH值对改性铁覆膜砂吸附NOM有很大的影响,表现为低"pH值去除效率高,高pH值去除效率低"的特点,其变化规律取决于添加物质的性质.磷酸盐会和腐殖酸在改性铁覆膜砂表面产生竞争吸附,磷酸盐对粉煤灰改性铁覆膜砂的吸附能力影响最大.
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| 关 键 词： | 铁覆膜砂 吸附 表面改性 腐殖酸 |
Study on preparation and adsorption characteristics of multi-element modified iron-oxide-coated sand |
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| He Lihu,Liang Yongmei and Qiu Rongliang.Study on preparation and adsorption characteristics of multi-element modified iron-oxide-coated sand[J].Techniques and Equipment for Environmental Pollution Control,2009,3(1):113-118. |
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| Authors: | He Lihu Liang Yongmei and Qiu Rongliang |
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| Institution: | 1.School of Environmental Science and Engineering;Zhongshan University;Guangzhou 510275;2.Heyuan Environmental Technology Center;Heyuan 517000 |
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| Abstract: | The preparation of multi-element modified iron-oxide-coated sand(IOCS) by adding diatomite,bentonite,fly ash or active carbon was investigated.The effect of added adsorbent on adsorption capacity of various modified IOCS and the adsorption characteristics and mechanism were discussed respectively.The effects of diatomite,bentonite,activated carbon and fly ash on improvements of adsorption capacity of the multi-element modified IOCS are different.The adsorption capacity of multi-element modified IOCS depends... |
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| Keywords: | iron-oxide-coated sand adsorption surface modification humic acid |
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