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Optimized synthesis of a core-shell structure activated carbon and its adsorption performance for Bisphenol A

Ndagijimana, Pamphile, Liu, Xuejiao, Li, Zhiwei, Yu, Guangwei, Wang, Yin
The Science of the total environment 2019 v.689 pp. 457-468
activated carbon, adsorbents, adsorption, aquatic environment, bisphenol A, cassava, ceramics, coal fly ash, endocrine-disrupting chemicals, endothermy, kaolinite, remediation, sorption isotherms, strength (mechanics)
The presence of endocrine disrupting chemicals (EDCs) in the environmental water poses a serious threat which requires strong practical solutions. The existing activated carbon-based adsorbents exhibit a number of limitations hindering for their use in adsorption in an aquatic environment. In this work, a controlled technique was used to make a protected Core-Shell structure Activated Carbon (CSAC) material with a smaller size (0.82 cm), thinner shell thickness (0.083 cm) and high mechanical strength (2.41 MPa). The experimental results demonstrated that the sizes of shell precursors used for preparing the ceramic shell had a pronounced influence on the produced material. The shell was prepared by using a mixture of kaolinite (400 mesh) and coal fly ash (100 mesh). The pellet activated carbon core was synthesized by a pelletizing method using powder activated carbon (92%) mixed with the binder (8%) from cassava splinters. The kinetic study evidenced that the performance of the material fitted better for pseudo-second-order kinetic and the intraparticle diffusion. Furthermore, the maximum amount of Bisphenol A (BPA) adsorption by CSAC fitting to Langmuir model was 28.5 mg g−1. The BPA adsorption by CSAC was an endothermic process. Therefore, this material could be applied in the remediation of various aquatic EDCs.