Synthesis and Adsorption Properties of Hydroxyapatite-modified Biochar from Bamboo Shoot Shell
Hydroxyapatite modified bamboo shoot shell biochar(BS-HAP)with porous structure and hydrophilic phosphate group was synthesized from bamboo shoot shell to adsorb uranyl ions(UO22+)in wastewater.The porous structure of BS-HAP can effectively increase the contact area with UO22+and promote the adsorption process of UO22+.The phosphate groups in BS-HAP can provide binding sites for the chemisorption of UO22+,which makes BS-HAP excellent adsorption properties for UO22+.At the same time,the ion exchange between Ca2+and UO22+and the electrostatic interaction between bio-char and UO22+synergistically promote the adsorption of UO22+by BS-HAP.Under acidic conditions,the adsorption capacity of BS-HAP for UO22+is 815.2 mg·g-1.BS-HAP not only has strong adsorp-tion capacity for UO22+,but also has good selectivity and stability.Even under multiple recycling and actual wastewater treatment conditions,BS-HAP can still maintain the efficient removal capacity for UO22+.BS-HAP provides an effective method for the treatment of uranium containing wastewater,which is of great significance for promoting the development of green and sustainable wastewater treat-ment technology.
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