Trithiocyanurate-functionalized hydrochar for effectively removing methylene blue and Pb (II) cationic pollutants

• Published in: Environmental pollution (1987) 2023-11, Vol.337, p.122585-122585, Article 122585
• Main Authors: Huang, Shen-Ao, Teng, Hua-Jing, Su, Yin-Tao, Liu, Xiao-Meng, Li, Bing
• Format: Article
• Language: English
• Subjects: Adsorption; Bamboo; Hydrochar; Methylene blue; Pb(II); Trithiocyanurate
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2023.122585

Functionalization can change the physicochemical properties of hydrochar and improve its ability to adsorb pollutants. Herein, a trithiocyanurate-functionalized hydrochar (TTHC) was obtained from acylation of chloroacetyl chloride and hydrochar and modification with trithiocyanuric acid in alkaline conditions. TTHC can efficiently remove cationic methylene blue (MB) and Pb(II) from wastewater. The removal can be expressed with pseudo-second-order kinetic and Langmuir models. The MB and Pb(II) removed uptakes by TTHC at 298 K exceeded 909.9 and 182.8 mg g−1 respectively, and the removal rates reached 90% and 98% within 120 min respectively. Characterizations show TTHC is functionalized with trithiocyanurate, and rich in thiolate and aromaticity, and tends to adsorb MB/Pb(II) via multiple adsorption mechanisms. After five sorption-desorption regeneration cycles, TTHC maintained 80% and 99% adsorption capacities for MB and Pb(II) respectively. Therefore, TTHC is a promising efficient sorbent for removing MB and Pb(II) from effluents. [Display omitted] •Trithiocyanurate was successfully grafted onto the surface of hydrochar.•Trithiocyanurate plays a key role in the removal of cationic contaminants.•The removal amounts of Pb(II) and methylene blue exceed 182.8 and 909.9 mg/g.•TTHC is an environmentally friendly, efficient, and renewable adsorbent.•Multiple mechanisms involve adsorption of Pb(II) and methylene blue.