Phosphate adsorption from wastewater using ZnAl-LDO-loaded modified banana straw biochar
- 78 Downloads
ZnAl-layered double hydroxide-loaded banana straw biochar (ZnAl-LDH-BSB) was prepared via the hydrothermal method, and the efficient phosphorus removal agent ZnAl-LDO-BSB was obtained by calcination at 500 °C. Based on the ZnAl-LDO-BSB adsorption characteristics, the adsorption mechanism was evaluated via TG/DTA, FTIR, XRD, SEM, HRTEM, and other characterization methods. The results showed that the ZnAl-LDO-BSB assembled into microspheres with typical hexagonal lamellar structures and presented good thermal stability. The adsorption of total phosphate (TP) by ZnAl-LDO-BSB conforms to the Langmuir model, and the theoretical maximum adsorption capacity is 185.19 mg g−1. The adsorption kinetics were in accordance with the second-order kinetic model, and the anion influence on TP adsorption followed the order CO32− > SO42− > NO3−. The combination of zeta potential measurements with the FTIR, XRD, SEM, HRTEM, and XPS results suggested that ZnAl-LDO-BSB adsorbs TP mainly by electrostatic adsorption, surface coordination, and anion intercalation.
KeywordsLayered double hydroxides Sorbents Adsorption Phosphate Wastewater treatment Adsorption mechanism
This work was partially supported by the National Natural Science Foundation of China (No. 51778180) and the University Key Laboratory of Karst Ecology and Environmental Change of Guangxi Province (Guangxi Normal University) (YRHJ15Z009), Innovation Project of Guangxi Graduate Education (XYCSZ2018067).
- Liu H, Peng W, Lu J, Guo F, Luo Y, Han C (2017) Research progress of fluoride-containing wastewater treatment by adsorption method. Technol Water Treatment 43:13–18. (in Chinese)Google Scholar