| 复合纳米Fe3O4的制备及其控磷效能的研究 |
| 摘要点击 4038 全文点击 2425 投稿时间：2009-04-07 修订日期：2009-07-25 |
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| 中文关键词 复合纳米Fe3O4 氧化沉淀法 磷 纤维素酶 吸附 羧甲基纤维素 |
| 英文关键词 composite nano-scale Fe3O4 oxidation deposition method phosphorus cellulase adsorption sodium carboxymethyl cellulose(CMC) |
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| 中文摘要 |
| 采用氧化沉淀法在羧甲基纤维素（CMC）体系中制备了以纳米Fe3O4为核心，外包覆羧甲基纤维素的复合纳米Fe3O4.对比研究了复合纳米Fe3O4和微米Fe3O4对水中磷的吸附以及对土壤中磷的固化，并考察了添加纤维素酶在此过程中所起的作用.结果表明，在水中微米Fe3O4的平衡吸附量为3.2 mg/g，而复合纳米Fe3O4 为2.1 mg/g. 当将纤维素酶（用以降解包覆在氧化铁表面的羧甲基纤维素）添加到复合纳米Fe3O4吸附磷的溶液中，复合纳米Fe3O4的除磷效率（86%）接近于微米Fe3O4（90%），说明羧甲基纤维素的存在减弱了复合纳米Fe3O4的吸附能力.在土柱实验中，将2种Fe3O4悬浊液注入到10cm高的土壤柱中，72%的复合纳米Fe3O4穿过土壤柱溢出，而微米Fe3O4完全滞留在土壤柱中没有溢出.原始土壤的固磷率为30%，注入复合纳米Fe3O4的土壤固磷率达到45%，而将纤维素酶和复合纳米Fe3O4一起注入土壤中固磷效率提高到74%. |
| 英文摘要 |
| Composite nano-scale Fe3O4 particles were prepared in sodium carboxymethyl cellulose(CMC) solution by the oxidation deposition method. The adsorptions of phosphorus by micro-scale Fe3O4 and composite nano-scale Fe3O4 were investigated in water and soil,and the role of cellulase in the adsorption of composite nano-scale Fe3O4 was studied. Kinetic tests indicated that the equilibrium adsorption capacity of phosphorous on the composite nano-scale Fe3O4 (2.1 mg/g) was less than that of micro-scale Fe3O4 (3.2 mg/g). When cellulase was added to the solution of composite nano-scale Fe3O4 to degrade CMC,the removal rate of P by the nanoparticles (86%) was enhanced to the same level as the microparticles (90%). In the column tests,when the composite nano-scale Fe3O4 suspension was introduced in the downflow mode through the soil column,72% of Fe3O4 penetrated through the soil bed under gravity. In contrast,the micro-scale Fe3O4 failed to pass through the soil column. The retention rate of P was 45% in the soil column when treated by the CMC-stabilized nanoparticles,in comparison with only 30% for the untreated soil column,however it could be improved to 74% in the soil column when treated by both the CMC-stabilized nanoparticles and cellulase,which degraded CMC after the nanoparticles were delivered into the soil. |
