期刊论文

Adsorption of Pb~(2+) in aqueous solutions by millet chaff: interactive effects between the key factors and mechanism study

中文

环境化学

0254-6108

2017

36

1

123-132

10.7524/j.issn.0254-6108.2017.01.2016051703

(2012BAC09B03):国家“十二五”科技支撑计划项目 (2015SK20023):湖南省科技计划项目 (CX2015B29):湖南省环境科学与工程重点学科建设项目,中南林业科技大学研究生科技创新基金 (2012BAC09B03):Supported by the Key Project of the National Twelfth-Five Year Research Program of China (2015SK20023):the Key Program of Hunan Provincial Department of Science and Technology :the Educational Department of Hunan Province (CX2015B29):Scientific Innovation Fund for Graduate of Central South University of Forestry and Technology

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采用响应面法(Box-Behnken design,BBD)考察粟米糠吸附Pb~(2+)的不同因素(pH值、Pb~(2+)初始浓度、吸附剂浓度和吸附时间)对吸附过程的影响及交互效应,并通过等温吸附和表征分析研究吸附过程的热力学特征及其吸附机理.结果表明,pH值与Pb~(2+)初始浓度和吸附剂浓度交互效应显著,Pb~(2+)初始浓度与吸附时间的交互效应显著.使用等温吸附模型拟合吸附过程发现,Langmuir和Freundlich模型拟合结果较好,该过程为物理吸附与化学吸附共同作用,293、298、303、308 K条件下的粟米糠最大吸附量q_m分别为10.33、10.56、11.10、 11.22 mg·g~(-1),其对Pb~(2+)吸附能力随温度上升而提高.对吸附热力学参数ΔG、Δ...

The Box-Behnken design (BBD) methodology including four factors: pH,initial Pb~(2+) concentration,adsorbent dosage and contact time was employed to study the adsorption process of Pb~(2+) from aqueous solution by millet chaff. The effects of four factors on the adsorption and interactive effects between the factors were evaluated. The results indicated that the interactive effects between pH and initial Pb~(2+) concentration,pH and adsorbent dosage,and initial Pb~(2+) concentration and contact time were significant. The equilibrium adsorption a...