Public Time:
2021-02-15 00:00:00
Journal:
Chemical Engineering Journal
doi: 10.1016/j.cej.2020.126784
Author:
Shilin Zhang;Laifu Zhong;Jie Wang;Aidong Tang;Huaming Yang
Summary:
Carbon and clay-based composites have great potential to be applied as sorbents for dye removal in wastewater treatment. Existing sorbent materials suffer from high cost and relatively low capacity. The key to solve this problem is to develop new composites as adsorbents. Here, we report a newly developed porous carbon-based MgAlF,·1.5H,O nanocomposites derived from carbon-coated palygorskite , a single-step HF etching for the first time. Structural and compositional evolution of a series of samples occured by subtly tuning of HF doses. Our results highlight the significantly enhanced adsorption capacity of Congo Red wastewater (4261.0 mg/g), which is approximately 7 and 123 times that of porous carbon (572.0 mg/g) and carbon-coated palygorskite (34.4 mg/g), respectively. The enhanced adsorption property is attributed to chemisorption mechanism between MgAlF,·1.5H,O and Congo Red , two Al atoms binding to two O atoms of the –SO, group. The corresponding adsorption energy was calculated to be −1.01 eV. In this work, porous carbon-based MgAlF,·1.5H,O adsorbents possess the characteristics of super high adsorption capacity, low cost and no pH dependence, which meets the environmental, economical and engineering requirements for wastewater dye removal, especially, for wastewater treatment under emergency circumstances.