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Carbon Nanotubes Functionalized with Calcium Carbonate for Flow-Through Sequential Electrochemical Phosphate Recovery
https://orcid.org/0000-0001-8404-3806
https://orcid.org/0000-0003-0709-4743
https://orcid.org/0000-0001-8178-9418
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 micro-environment 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.
An electroactive CNT filter functionalized with calcium carbonate enables sequential electrochemical phosphate recovery in a flow-through configuration.
Carbon Nanotubes Functionalized with Calcium Carbonate for Flow-Through Sequential Electrochemical Phosphate Recovery
https://orcid.org/0000-0001-8404-3806
https://orcid.org/0000-0003-0709-4743
https://orcid.org/0000-0001-8178-9418
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 micro-environment 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.
An electroactive CNT filter functionalized with calcium carbonate enables sequential electrochemical phosphate recovery in a flow-through configuration.
Carbon Nanotubes Functionalized with Calcium Carbonate for Flow-Through Sequential Electrochemical Phosphate Recovery
https://orcid.org/0000-0001-8404-3806
https://orcid.org/0000-0003-0709-4743
https://orcid.org/0000-0001-8178-9418
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 micro-environment 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.
An electroactive CNT filter functionalized with calcium carbonate enables sequential electrochemical phosphate recovery in a flow-through configuration.
Carbon Nanotubes Functionalized with Calcium Carbonate for Flow-Through Sequential Electrochemical Phosphate Recovery
Liu, Yanbiao (author) / Hu, Xuemei (author) / Lei, Yang (author) / Li, Fang (author) / You, Shijie (author)
ACS ES&T Water ; 2 ; 206-215
2022-01-14
Article (Journal)
Electronic Resource
English
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