摘要
通过静电自组装法制备Fe_3O_4@酵母,并对其进行SEM和XRD表征。以亚甲基蓝模拟染料废水,采用响应面方法(Response Surface Methodology,RSM)中Box-Behnken Design(BBD)设计法对溶液初始质量浓度、流速和p H等影响因素进行了优化。通过分析试验结果,建立了以去除率为响应值的二次多项式模型,预测最佳条件为亚甲基蓝初始质量浓度为101.21 mg/L,流速为5.48 m L/min,p H=10.75,去除率为63%,在此条件下做验证性实验3次,最终实测去除率均值为61.86%,与预测值具有良好的一致性。对亚甲基蓝去除率影响的大小顺序为X3>X2>X1,即溶液p H>溶液流速>溶液初始质量浓度。对Fe_3O_4@酵母复合微球的多相类Fenton再生进行了研究,基于酵母菌的生物吸附和纳米Fe_3O_4的非均相Fenton反应的耦合作用,Fe_3O_4@酵母复合材料具有良好的可再生性。
Fe3O4@ yeast composites are synthesized by a simple electrostatic-interaction-driven self-assembly heterocoagulation. The composites are characterized by field emission scanning electron microscopy( FE-SEM) and powder X-ray diffraction( XRD). The obtained Fe3O4@ yeast composites are then used in an up-flow packed column to remove the model water contaminant methylene blue dye( MB) by consecutive biosorption-heterogeneous Fenton oxidation regeneration. The optimization is performed by using Box-Behnken Design( BBD) type of response surface methodology( RSM). The secondary polynomial regression model is established with removal rate as response parameter.Under the optimal conditions,the removal rate is 61. 86%,which is very close to the predicted value of 63%. The in-situ regeneration of the contaminant-loaded Fe3O4@ yeast microspheres in multiple cycles is studied through triggering the heterogeneous Fenton-like reaction catalyzed by the supported magnetite,owing to coupled interaction of biosorption features of yeast cells and the excellent Fenton catalytic properties of Fe3O4 nanoparticles.
出处
《现代化工》
CAS
CSCD
北大核心
2016年第1期110-114,共5页
Modern Chemical Industry
基金
国家自然科学基金项目(21176031)
陕西省矿产资源勘查与综合利用重点实验室开放课题基金资助(2015-001)