4.6 Article

Chitosan crosslinked composite based on corncob lignin biochar to adsorb methylene blue: Kinetics, isotherm, and thermodynamics

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ELSEVIER
DOI: 10.1016/j.colsurfa.2022.128621

关键词

Lignin; Chitosan crosslinked composite; Methylene blue; Adsorption mechanism

资金

  1. Foundation for Young Talents in Forestry and Grassland Science and Technology Innovation [2019132610]
  2. Fundamental Research Funds for the Central Universities [2021ZY24]
  3. State Key Laboratory of Bio-Fibers and Eco-Textiles (Qingdao University) [K2019-04]

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The study found that the prepared CS-BC showed excellent performance in removing methylene blue, with an increased adsorption capacity by about 2 times and good recycling performance, providing a potential solution for treating industrial wastewater.
Methylene blue (MB) in industrial wastewater is a potential threat to human health and environment and the removal of methylene blue attracts wide attention. In this study, corncob lignin was carbonized at 400 degrees C and cross-linked with chitosan in the presence of epichlorohydrin to prepare a composite (CS-BC), and the adsorption behavior was discussed by using MB as adsorbate. Its removal of methylene blue reached 99.96% with a maximum adsorption capacity of 499.8 mg/g, and the adsorption behavior was in accordance with the Langmuir model. The fitness of pseudo-second-order kinetic model conceded that chemisorption played a major role. Compared with unmodified biochar, the adsorption capacity of CS-BC was increased by similar to 2 times. CS-BC had good recyclability and was easy to separate from water, which maintained excellent absorption performance after 5 cycles. The excellent adsorption capacity and recycling performance of CS-BC provide a prospect way to eliminate methylene blue from industrial effluents.

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