Preparation of Nanosheet Interconnected Hierarchical Porous Biochar for Degradation of Cr(Ⅵ)Wastewater by Ice Template
In this paper,interconnected hierarchical porous biochar(NHB)with nanosheet was prepared by using fresh tofu residues which was frozen as a template to form a large number of micro-nano-structured ice clusters or snow crystals.The NHB material was characterized by XRD,BET,TEM and FTIR.At the same time,based on the adsorption kinetics model,the removal kinetics of chromium hexavalent by NHB material was investigated.At Cr(Ⅵ)of a pH of 2 with the concentration 100 mg/g,the adsorption effect of modified sheet biochar(NHB)on Cr(Ⅵ)is 170.3 mg/g,which is 7.8 times that of typical massive biochar(TB)(21.6 mg/g).The interconnect hierarchical porous nanosheet structure of NHB materials exposes more active sites for the adsorption of hexavalent chromium in wastewater and provides a channel conducive to ion migration.
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