Carey Michael S, Barsoum Michel W
Department of Materials Science and Engineering, Drexel University Philadelphia PA 19104 USA
RSC Adv. 2022 Oct 27;12(47):30846-30850. doi: 10.1039/d2ra03500f. eCollection 2022 Oct 24.
Treatment of HF or HCl/LiF etched TiCT with 0.05 M NaHCO before water washing reduces the wastewater generated by 75%. When etched with HF, cryolite (NaAlF) precipitation from spent etching waste effectively removes fluorine from this waste stream, offers insight into the etching chemistry of MAX to MXene, and provides an effective analytical tool for optimization of MXene production. Additionally, washing HF etched multilayered TiCT with 0.05 M NaHCO allows for the production of delaminated TiCT colloidal suspensions, which typically requires the use of TBAOH or DMSO for intercalation and subsequent delamination. TiCT made with HCl/LiF and washed with 0.05 M NaHCO yields a colloidal suspension with a concentration of 18 mg mL and a film conductivity of 1150 S cm.
在水洗之前，用0.05 M碳酸氢钠处理氢氟酸或盐酸/氟化锂蚀刻的TiCT，可使产生的废水减少75%。在用氢氟酸蚀刻时，废蚀刻液中冰晶石（NaAlF）的沉淀有效地去除了该废物流中的氟，有助于深入了解MAX到MXene的蚀刻化学，并为优化MXene生产提供了一种有效的分析工具。此外，用0.05 M碳酸氢钠洗涤氢氟酸蚀刻的多层TiCT，能够制备分层的TiCT胶体悬浮液，而这通常需要使用氢氧化四丁基铵或二甲基亚砜进行插层和随后的分层。用盐酸/氟化锂制备并经0.05 M碳酸氢钠洗涤的TiCT可产生浓度为18 mg/mL且薄膜电导率为1150 S/cm的胶体悬浮液。
