Nuclear chemistry

Chemisorption

Quantum mechanics

Catalysis

Adsorption

Composite number

Engineering

Epichlorohydrin

Pyrolysis

Materials science

Raw material

Methylene blue

Chitosan

Chemical engineering

Langmuir adsorption model

Biochar

Thermodynamics

Physics

Organic chemistry

Carbonization

Corncob

Composite material

Kinetics

Chemistry

Photocatalysis

Lignin

Colloids and Surfaces A Physicochemical and Engineering Aspects

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 °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 ~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.

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