Carbon Nanotubes Functionalized with Calcium Carbonate for Flow-Through Sequential Electrochemical Phosphate Recovery

Liu, Yanbiao1; Hu, Xuemei1; Lei, Yang2; Li, Fang3; You, Shijie4

2021-12-01

10.1021/acsestwater.1c00350

ACS ES&T WATER   影响因子和分区

2690-0637

Phosphorus discharged from sewage effluent and agricultural run-off has been identified to be the major cause of eutrophication. One feasible way to deal with the phosphate-containing wastewater is to realize electrochemically induced phosphate precipitation with coexisting calcium ions. Herein, an electrochemical carbon nanotube (CNT) filter functionalized with calcium carbonate (CaCO3) was developed, which was demonstrated to achieve improved phosphate recovery compared with previous electrochemical systems. The concept was based on loaded CaCO3 particles that facilitated calcium phosphate precipitation through buffering H+ produced from water oxidation at the anode and releasing Ca2+; thereby, a high pH microenvironment was established in the vicinity of cathode. The results showed that CaCO3-loaded CNT filter could achieve 84.1% phosphate recovery in 3 h under applied voltage of 3 V and flow rate of 1.5 mL/min. This value was 71.9% higher than that for the conventional batch reactor (12.2%), which should result from the convection-enhanced mass transport. Based on the characterization and kinetic studies, an underlying working mechanism for the phosphate recovery was proposed. This study will provide new insights for the development of an efficient continuous-flow electrochemical system to address phosphate-relevant issues in terms of environmental benefit and resource recovery.

phosphorus CaCO3 electrochemical carbon nanotube filter phosphate precipitation

ESCI

英语

其他

National Natural Science Foundation of China[52170068,51822806] ; Heilongjiang Touyan Innovation Team Program[HIT-SE-01]

Environmental Sciences & Ecology ; Water Resources

Environmental Sciences ; Water Resources

WOS:000731118500001

AMER CHEMICAL SOC

Web of Science

1.Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
2.Southern Univ Sci & Technol SUSTech, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
3.Donghua Univ, Coll Environm Sci & Engn, Shanghai 201620, Peoples R China
4.Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Sch Environm, Harbin 150090, Peoples R China

Liu, Yanbiao,Hu, Xuemei,Lei, Yang,et al. Carbon Nanotubes Functionalized with Calcium Carbonate for Flow-Through Sequential Electrochemical Phosphate Recovery[J]. ACS ES&T WATER,2021.

Liu, Yanbiao,Hu, Xuemei,Lei, Yang,Li, Fang,&You, Shijie.(2021).Carbon Nanotubes Functionalized with Calcium Carbonate for Flow-Through Sequential Electrochemical Phosphate Recovery.ACS ES&T WATER.

Liu, Yanbiao,et al."Carbon Nanotubes Functionalized with Calcium Carbonate for Flow-Through Sequential Electrochemical Phosphate Recovery".ACS ES&T WATER (2021).