High-rate removal of As(III) from aqueous system with sulfhydryl magnetic biological bamboo charcoal nanocomposites prepared by chemical co-precipitation method
(1. College of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China;
2. College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
3. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
4. Hunan Research Institute for Nonferrous Metals Co., Ltd., Changsha 410007, China;
5. Hunan Research Academy of Environmental Sciences, Changsha 410014, China)
2. College of Environmental Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China;
3. Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China;
4. Hunan Research Institute for Nonferrous Metals Co., Ltd., Changsha 410007, China;
5. Hunan Research Academy of Environmental Sciences, Changsha 410014, China)
Abstract: Sulfhydryl magnetic biological bamboo charcoal nanocomposite (BBC@nFe-SH) was prepared by chemical co-precipitation method for the robust capture of As(III) from aqueous solutions. The novel BBC@nFe-SH shows favorable magnetic field strength (83376 A/m), which enables BBC@nFe-SH to be quickly recovered from aqueous solution. The maximum As(III) adsorption capacity is as high as 98.63 mg/g at pH 5.0 and 40 °C, reaching reaction equilibrium within 120 min. Various characterizations (e.g., SEM, FTIR, VSM and XPS) suggest that As(III) prefers to coordinate with surface oxygen groups bonded to the surface. BBC@nFe-SH displayed high stability and recyclability throughout the removal process, which could be easily activated by 1 mol/L NaOH after usage. Thus, the novel BBC@nFe-SH has promising applications for As(III) treatment.
Key words: arsenic-containing wastewater; bamboo biochar; chemical co-precipitation; adsorption; recyclability; wastewater treatment