Macro- and micro-algae-based carbon composite for pharmaceutical wastewater treatment: Batch adsorption and mechanism study

作者：Xu, Shannan; Yang, Jingwen; Marrakchi, Fatma; Wei, Manman; Liu, Yong^*; Xiao, Yayuan; Li, Chunhou; Wang, Shuang^*

来源：PROCESS SAFETY AND ENVIRONMENTAL PROTECTION, 2023, 176: 641-652.

DOI：10.1016/j.psep.2023.06.020

• Tetracycline
• Biochar
• Algal biomass
• Adsorption capacity
• Surface area
• Composite activated carbon

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 degrees C, then activated with NaOH at 800 degrees C to prepare composite biochar (ECA-B). The effects of TC concentration (50-500 mg.L-1), pH (3-11), temperature (30 degrees C-50 degrees C), and contact time (0-960 min) on TC absorption were investigated. Results revealed that in aqueous solutions, the biochar (EC4:1-0.5)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 EC4:1-0.5 remained above 80 % after five cycles. The surface area of EC4:1-0.5 (583.329 m(2).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 EC4:1-0.5. This investigation provides a method for the synthesis and optimization of algal biomass-based activated carbon for the absorption of organic pollutants in wastewater.

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