Fluoride removal from coal mining water using novel polymeric aluminum modified activated carbon prepared through mechanochemical process  

作　　者：Yixiang Bao Yonghui Qi Qiao Li Lei Wang Zhiguo Cao Jie Li Min Wu Jun Chen Haiqin Zhang Qiang Guo Binbin Jiang Jinkui Zhong Jingfeng Li 

机构地区：[1]State Key Laboratory of Water Resource Protection and Utilization in Coal Mining,National Institute of Clean and Low Carbon Energy,Beijing 102209,China [2]School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China [3]China Coal Society,Chaoyang District,Beijing 100013,China [4]Guoneng Shendong Coal Technology Research Institute,Yulin 719315,China [5]Bulianta Coal Mine,Shendong Coal Group Co.Ltd.,Erdos 017209,China

出　　处：《Journal of Environmental Sciences》2024年第12期226-236,共11页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52100070);the Science and Technology Innovation Project of China Energy Investment Corporation(No.SZY93002219N).

摘　　要：Defluoridation of coal mining water is of great significance for sustainable development of coal industry in western China.A novel one-step mechanochemical method was developed to prepare polymeric aluminum modified powder activated carbon(PAC)for effective fluoride removal from coal mining water.Aluminum was stably loaded on the PAC through facile solid-phase reaction between polymeric aluminum(polyaluminum chloride(PACl)or polyaluminum ferric chloride(PAFC))and PAC(1:15 W/W).Fluoride adsorption on PACl and PAFC modified PAC(C-PACl and C-PAFC)all reached equilibrium within 5 min,at rate of 2.56 g mg^(-1)sec^(-1)and 1.31 g mg^(-1)sec^(-1)respectively.Larger increase of binding energy of Al on C-PACl(Al–F bond:76.64 eV and Al–FOH bond:77.70 eV)relative to that of Al on C-PAFC(Al–F bond:76.52 eV)explained higher fluoride uptake capacity of C-PACl.Less chloride was released from C-PACl than that from C-PAFC due to its higher proportion of covalent chlorine and lower proportion of ionic chlorine.The elements mapping and atomic composition proved the stability of Al loaded on the PAC as well as the enrichment of fluoride on both CPACl and C-PAFC.The Bader charge,formation energy and bond length obtained from DFT computational results explained the fluoride adsorption mechanism further.The carbon emission was 7.73 kg CO_(2)-eq/kg adsorbent prepared through mechanochemical process,which was as low as 1:82.3 to 1:8.07×10^(4)compared with the ones prepared by conventional hydrothermal methods.

关 键 词：FLUORIDE ADSORPTION MECHANOCHEMISTRY Polymeric aluminum Powder activated carbon 

分 类 号：X703[环境科学与工程—环境工程]