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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10 cm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 Fe3O4penetrated 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.
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