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高粱秸秆吸附水中Cr(Ⅵ)的工艺及其动力学

Process and Kinetics for Adsorption of Cr(Ⅵ) in Water of Sorghum Straw
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摘要 为了获得高粱秸秆吸附水中Cr (Ⅵ)的最佳工艺,本试验采用正交设计试验方法优化高粱秸秆吸附水中Cr (Ⅵ)的工艺条件,并研究其吸附动力学机理。结果显示,影响高粱秸秆吸附水中Cr (Ⅵ)的因素大小顺序为:高粱秸秆加入量>溶液pH>Cr (Ⅵ)初始质量浓度。最佳吸附工艺为:在固定高粱秸秆粒度80目、吸附温度30℃和高粱秸秆加入量8.0 g/L的条件下,Cr (Ⅵ)初始质量浓度5.0 mg/L,pH 2.0,振荡吸附时间140 min。该工艺条件下,Cr (Ⅵ)吸附去除率可达94.20%。高粱秸秆对Cr (Ⅵ)具有良好的吸附作用,该吸附过程可更好地用准二级动力学模型描述,表明高粱秸秆对水中Cr (Ⅵ)的吸附以化学吸附为主。本研究为高粱秸秆在环境含Cr (Ⅵ)废水治理中的应用提供了理论依据。 In order to obtain the optimal process of the adsorption of Cr (Ⅵ) in water from sorghum straw, we used to orthogonal design method to optimize the technological conditions of Cr (Ⅵ) from sorghum straw, and studied its adsorption kinetics mechanism. Results indicated that the sequence of every factor on affecting the Cr (Ⅵ) in water from sorghum straw was as follows: the adding amount of sorghum stalk>solution pH>the initial concentration of Cr (Ⅵ). The optimum adsorption process was as follows: under the condition that the grain size of the fixed sorghum straw was 80 mesh, adsorption temperature was 30℃, and the adding amount of sorghum straws was 8.0 g/L, then the initial mass concentration of Cr (Ⅵ) was 5.0 mg/L, pH was 2.0 and oscillation adsorption time was 140 min. Under this process condition, the adsorption removal rate of Cr (Ⅵ) can reach 94.20%. Sorghum straw had a good adsorption effect on Cr (Ⅵ). The adsorption process can be well described with pseudo- second-order kinetics model, which indicated that the main Cr (Ⅵ) adsorption process of aqueous solution by sorghum straw was mainly chemical adsorption. These results provided theoretical basis for the application of Cr (Ⅵ) adsorption of waste water aqueous solution by sorghum straw.
作者 赵强 杨洁 赵三虎 赵二劳 Zhao Qiang;Yang Jie;Zhao Sanhu;Zhao Erlao(Department of Chemistry,Xinzhou Teachers University,Xinzhou,034000)
出处 《分子植物育种》 CAS CSCD 北大核心 2019年第15期5097-5101,共5页 Molecular Plant Breeding
基金 山西省1331工程重点学科建设计划支持项目(2018) 忻州师范学院科研基金项目(201714)共同资助
关键词 高粱秸秆 CR (Ⅵ) 吸附 工艺 动力学 Sorghum straw Cr (Ⅵ) Adsorption Process Kinetics
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