1. Macro- and micro-algae-based carbon composite for pharmaceutical wastewater treatment: Batch adsorption and mechanism study.
- Author
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Xu, Shannan, Yang, Jingwen, Marrakchi, Fatma, Wei, Manman, Liu, Yong, Xiao, Yayuan, Li, Chunhou, and Wang, Shuang
- Subjects
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CARBON composites , *WASTEWATER treatment , *ACTIVATED carbon , *ADSORPTION (Chemistry) , *ADSORPTION capacity , *BIOCHAR - Abstract
Biochar synthesized from algal biomasses acts as an efficient adsorbent to remove tetracycline (TC) from aqueous solutions. In this study, a mixture of Enteromorpha (EN) and Chlorella vulgaris (CV) was pyrolyzed at 500 °C, then activated with NaOH at 800 °C to prepare composite biochar (EC A -B). The effects of TC concentration (50–500 mg·L−1), pH (3–11), temperature (30 °C–50 °C), and contact time (0–960 min) on TC absorption were investigated. Results revealed that in aqueous solutions, the biochar (EC 4:1 -0.5)prepared with CV and EN at the mass ratio of 4:1 and the impregnation ratio of 0.5 had the optimal TC adsorption capacity (Q m = 376.878 mg·g−1). The removal rate of EC 4:1 -0.5 remained above 80 % after five cycles. The surface area of EC 4:1 -0.5 (583.329 m2·g−1) increased by three and four times that of EN and CV, respectively. Intraparticle diffusion was considered as the major limitation for the adsorption of TC onto EC 4:1 -0.5. This investigation provides a method for the synthesis and optimization of algal biomass-based activated carbon for the absorption of organic pollutants in wastewater. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2023
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