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Identifying adsorption sites for Cd(II) and organic dyes on modified straw materials
Wei Liu1, Jie Huang2, Anthony J Weatherley3
1Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China; Institute of Life Science and Green Development, Hebei University, Baoding, 071002, PR China.
Agricultural waste can be transformed into remediation materials for wastewater treatment. Optimal modification temperatures differ for removing dyes like methylene blue (MB) and crystal violet (CV) versus heavy metals like cadmium (Cd).
Area of Science:
- Environmental Science
- Materials Science
- Chemical Engineering
Background:
- Agricultural waste, such as wheat straw, presents disposal challenges.
- Developing cost-effective wastewater treatment solutions is crucial.
- Valorizing agricultural waste into functional materials offers a sustainable approach.
Purpose of the Study:
- To investigate wheat straw modified by thermal partial-oxidation as an adsorbent for pollutants.
- To identify active adsorption sites for methylene blue (MB), crystal violet (CV), and cadmium (Cd).
- To determine optimal modification conditions for pollutant removal.
Main Methods:
- Wheat straw was modified using a thermal partial-oxidation process at various temperatures.
- Adsorption experiments were conducted using MB, CV, and Cd(II) as model pollutants.
- Surface functional groups and their correlation with adsorption capacity were analyzed.
Main Results:
- Optimal modification temperatures for MB and CV adsorption were 160-180 °C.
- Optimal modification temperatures for Cd(II) adsorption were 220-240 °C.
- A strong linear correlation was found between surface group concentration and Cd(II) uptake, with both acidic and basic groups being favorable.
- Higher modification temperatures, generating more basic groups, negatively impacted MB and CV adsorption.
Conclusions:
- Wheat straw modified by thermal partial-oxidation is effective for removing diverse pollutants.
- Adsorption mechanisms and optimal conditions vary significantly between organic dyes and heavy metals.
- This study provides mechanistic insights for utilizing agricultural waste in environmental remediation.
