***Direct air capture using electrochemically regenerated anion exchange resins***
Authors: Qingdian Shu a,b, Marina Haug a,c, Michele Tedesco a, Philipp Kuntke a,b, and Hubertus V. M. Hamelers a,b
a Wetsus, European Centre of Excellence for Sustainable Water Technology, The Netherlands
b Environmental Technology, Wageningen University, The Netherlands
c Faculty of Natural and Environmental Sciences, Hochschule Zittau/Görlitz, Germany

Corresponding author: Philipp Kuntke 

Contact imformation: 

philipp.kuntke@wur.nl 

Environmental Technology, Wageningen University, 
Bornse Weilanden 9, 6708 WG Wageningen;  
P.O. Box 17, 6700 AA Wageningen, The Netherlands

***General Introduction***

This dataset contains data collected during experiments on direct air capture using electrochemically regenerated anion exchange resins. It is being made public both to act as supplementary data for publication and in order for other researchers to use this data in their own work.
This work was performed at Wetsus, European Centre of Excellence for Sustainable Water Technology, between March 2021 and August 2021. 
File: Full adsorption experiment.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in a full adsorption experiment lasted for around 100 hours. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 1st 48h-adsorption with lab air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the first 48-hour adsorption experiment with lab air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 1st desorption with lab air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the first desorption experiment with lab air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 2nd 48h-adsorption with lab air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the second 48-hour adsorption experiment with lab air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 2nd desorption with lab air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the second desorption experiment with lab air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 3rd 48h-adsorption with lab air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the third 48-hour adsorption experiment with lab air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 3rd desorption with lab air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the third desorption experiment with lab air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 4th 48h-adsorption with lab air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the fourth 48-hour adsorption experiment with lab air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 4th desorption with lab air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the fourth desorption experiment with lab air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 5th 48h-adsorption with lab air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the fifth 48-hour adsorption experiment with lab air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 5th desorption with lab air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the fifth desorption experiment with lab air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 1st 48h-adsorption with outdoor air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the first 48-hour adsorption experiment with ourdoor air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 1st desorption with outdoor air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the first desorption experiment with outdoor air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 2nd 48h-adsorption with outdoor air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the second 48-hour adsorption experiment with ourdoor air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 2nd desorption with outdoor air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the second desorption experiment with outdoor air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 3rd 48h-adsorption with outdoor air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the third 48-hour adsorption experiment with ourdoor air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 3rd desorption with outdoor air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the third desorption experiment with outdoor air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 4th 48h-adsorption with outdoor air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the fourth 48-hour adsorption experiment with ourdoor air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 4th desorption with outdoor air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the fourth desorption experiment with outdoor air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 5th 48h-adsorption with outdoor air.csv - includes the data recorded every 10 seconds by the CO2/H2O analyzers in the fifth 48-hour adsorption experiment with ourdoor air. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).
File: 5th desorption with outdoor air.csv - includes the data recorded every second by the data logger and FlowPlot software of the mass flow meter in the fifth desorption experiment with outdoor air. The recorded variables were: Date_(D-M-Y), Time, pH_acidifying_solution, Conductivity_acidifying_solution_(µS/cm), Conductivity_regeneration_solution_(µS/cm), Conductivity_spent_regeneration_solution_(µS/cm), Current_(mA), Voltage_(V), Gas production_%.
File: 150 adsorption-desorption cycles.csv - includes the data recorded every second by the CO2/H2O analyzers in the adsorption steps of the 150 adsorption-desorption cycles with a smaller colomn. The recorded variables were: System_Date_(M-D-Y), System_Time_(h:m:s), CO2_in_(µmol_mol-1), H2O_in_(mmol_mol-1), CO2_out_(µmol_mol-1), H2O_out_(mmol_mol-1).

All calculations are included in the manuscript. DOI: to be added
Data specific information: 
CO2_in_(µmol_mol-1): CO2 concentration in the influent of the adsorber.  
H2O_in_(mmol_mol-1): H2O concentration in the influent of the adsorber. 
CO2_out_(µmol_mol-1): CO2 concentration in the effluent of the adsorber.  
H2O_out_(mmol_mol-1): H2O concentration in the effluent of the adsorber. 
pH_acidifying_solution: pH of the acidifying solution.  
Conductivity_acidifying_solution_(µS/cm): conductivity of the acidifying solution.  
Conductivity_regeneration_solution_(µS/cm): conductivity of the regeneration solution.  
Conductivity_spent_regeneration_solution_(µS/cm): conductivity of the spent regeneration solution. 
Current_(mA): current applied on the electrochemical cell.  
Voltage_(V): measured cell voltage.  
Gas production_%: the ratio of the gas production rate to the full capacity of the mass flow meter (50 mln/min). 
