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Biomass Chemical Engineering ›› 2019, Vol. 53 ›› Issue (4): 37-44.doi: 10.3969/j.issn.1673-5854.2019.04.006

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Preparation of Oxalic Acid Modified Bagasse Carbon and Its Adsorption Characteristics for Cr(Ⅵ)

Xuemei LIU(),Chuang MA*(),Jiaxi TAO   

  1. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
  • Received:2018-04-12 Online:2019-07-30 Published:2019-08-05
  • Contact: Chuang MA E-mail:lyumu@ecjtu.edu.cn;1668571841@qq.com
  • Supported by:
    江西省科技支撑计划项目(20161BBF60060);江西省自然科学基金资助项目(20151BAB207009)

Abstract:

Using bagasse(OB) as raw material, carbon bagasse carbon(CB) was obtained by carbonization at high temperature in air atmosphere, and then oxalic acid modified bagasse carbon(COB) was prepared by oxalic acid modification. The three kinds of samples were characterized by SEM, FT-IR and nitrogen adsorption-desorption isotherms, and the adsorption effect of Cr(Ⅵ) in simulated wastewater was simulated. The characterization results showed that the specific surface area was COB>CB>OB, the specific surface area of COB was 240.67 m2/g, the total pore volume was 0.138 cm3/g, and the average pore diameter was 2.30 nm. The pore structures of CB and COB were more than that of OB. The types and quantities of developed and oxygen-containing functional groups of CB and COB were significantly increased, and the adsorption capacities of CB and COB were improved. The results of adsorption experiments showed that the adsorption capacities of Cr(Ⅵ) were COB>CB>OB. Under the conditions of pH value 1, dosage of COB 0.6 g, adsorption time 100 min, adsorption temperature 25℃ and Cr(Ⅵ) mass concentration 50 mg/L, the removal rate of Cr(Ⅵ) by COB was 99.1%. The adsorption thermodynamics and kinetics results showed that the Langmuir isotherm adsorption model could better reflect the adsorption process, and the adsorption process followed the pseudo-second-order kinetics model, indicating that the adsorption process of Cr(Ⅵ) by bagasse carbon was mainly monolayer adsorption of chemisorption.

Key words: modification, carbonization, adsorption, bagasse, Cr(Ⅵ)

CLC Number: