Abstract
Alkali lignin (AL) has attracted great attention as a material for treating dye wastewater due to its low cost and environmental friendliness. However, the unique structure and aggregation characteristics of AL regarding the dye wastewater removal mechanism have not been systematically revealed. Here, the removal process of typical cationic dye contaminants (methylene blue, MB) from dye wastewater by AL at different pH was explored and the unique synergistic effect mechanism of adsorption and flocculation was revealed. With increasing pH, the removal rate initially increased and then decrease. With increasing MB concentration, the optimal pH value corresponding to the maximum adsorption rate increased regularly. Zeta potential and Fourier transform infrared spectroscopy (FTIR) showed that electrostatic and π–π interactions and hydrogen bonding consisted push-pull balance under the influence of pH. In addition, scanning electron microscopy (SEM), ultraviolet and visible spectrum (UV) and particle size analysis showed that the aggregate structure and synergistic mechanism changed with the solution pH and concentration. In the low concentration solution, adsorption dominated. While in the high concentration solution, flocculation dominated. The removal mechanism consisted of the synergy of adsorption and flocculation laying the foundation for the efficient and environmentally friendly treatment of dye wastewater by AL.
Funding source: Natural Science Foundation of Hebei Province
Award Identifier / Grant number: B2021202012
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 22272043
Award Identifier / Grant number: 22278110
Funding source: State Key Laboratory of Pulp and Paper Engineering
Award Identifier / Grant number: 202210
Funding source: Tianjin Technical Innovation Guidance Special Project
Award Identifier / Grant number: 20YDTPJC00630
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: The work was supported by the National Natural Science Foundation of China (22278110, 22272043), Hebei Province Natural Science Foundation (B2021202012), Tianjin Technical Innovation Guidance Special Project (No. 20YDTPJC00630), State Key Laboratory of Pulp and Paper Engineering (202210).
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Conflict of interest statement: The authors declare that they have no conflicts of interest regarding this article.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/hf-2022-0117).
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Articles in the same Issue
- Frontmatter
- Original Articles
- Intra-species variation in maximum moisture content, cell-wall density and porosity of hardwoods
- Fractal dimension of wood pores from pore size distribution
- Fatigue testing of wood up to one billion load cycles
- The influence of vacuum heat treatment on the pore structure of earlywood and latewood of larch
- The relationship between color and mechanical properties of heat-treated wood predicted based on support vector machines model
- Effect of water/moisture migration in wood preheated by hot press on sandwich compression formation
- Quercetin-grafted modification to improve wood decay resistance
- Organosolv delignification of birch wood (Betula pendula): DMSO/water pulping optimization
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Articles in the same Issue
- Frontmatter
- Original Articles
- Intra-species variation in maximum moisture content, cell-wall density and porosity of hardwoods
- Fractal dimension of wood pores from pore size distribution
- Fatigue testing of wood up to one billion load cycles
- The influence of vacuum heat treatment on the pore structure of earlywood and latewood of larch
- The relationship between color and mechanical properties of heat-treated wood predicted based on support vector machines model
- Effect of water/moisture migration in wood preheated by hot press on sandwich compression formation
- Quercetin-grafted modification to improve wood decay resistance
- Organosolv delignification of birch wood (Betula pendula): DMSO/water pulping optimization
- Alkali lignin as a pH response bifunctional material with both adsorption and flocculation for wastewater treatment
- Evaluation of the mechanical properties of different parts of bending bamboo culm by nanointendation