Chitosan/nano-lignin based composite as a new sorbent for enhanced removal of dye pollution from aqueous solutions
The utilization of renewable and functional group enriched nano-lignin as bio-additve in fabricating composite has become the focus of attention worldwide. Herein, lignin nanoparticles in the form of hollow spheres with the diameter of the order of 138 ± 39 nm were directly prepared from agro-indu...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier B.V.
2019
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/45289/1/Sohni%20et%20al%202019.pdf http://ir.unimas.my/id/eprint/45289/ https://www.sciencedirect.com/science/article/abs/pii/S0141813019306671 https://doi.org/10.1016/j.ijbiomac.2019.03.151 |
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| Institution: | Universiti Malaysia Sarawak |
| Language: | English |
| Summary: | The utilization of renewable and functional group enriched nano-lignin as bio-additve in fabricating composite
has become the focus of attention worldwide. Herein, lignin nanoparticles in the form of hollow spheres with
the diameter of the order of 138 ± 39 nm were directly prepared from agro-industrial waste (palm kernel
shell) using recyclable tetrahydrofuran in an acidified aqueous system without any chemical modification
steps. We then fabricated a new chitosan/nano-lignin composite material as highly efficient sorbent, as demonstrated by efficient removal (~83%) of methylene blue (MB) dye under natural pH conditions. The adsorption process obeyed pseudo-second-order kinetics and adequate fitting of the adsorption data using Langmuir model
suggested a monolayer adsorption with a maximum adsorption capacity of 74.07 mg g−1
. Moreover, thermodynamic study of the system revealed spontaneous and endothermic nature of the sorption process. Further studies
revealed that chitosan composite with nano-lignin showed better performance in dye decontamination compared to native chitosan and chitosan/bulk lignin composite. This could essentially be attributed to synergistic effects of size particularity (nano-effect) and incorporated functionalities due to lignin nanoparticles. Recyclability
study performed in four repeated adsorption/regeneration cycles revealed recyclable nature of as-prepared composite, whilst adsorption experiments using spiked real water samples indicated recoveries as high as 89%. Based
on this study, as-prepared bio-nanocomposite may thus be considered as an efficient and reusable adsorptive
platform for the decontamination of water supplies. |
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