Thermodynamics of CO2 Adsorption on Polyethyleneimine Mesoporous Silica and Activated Carbon

Mj, Al-Marri; Ka, Al-Saad; Saad, Mohamed; Cortes, Dan; Mm, Khader

doi:10.4172/2161-0398.1000239

Cited by 6 publications

(1 citation statement)

References 30 publications

(49 reference statements)

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“…For the specific binding interaction with the acidic gas molecules, CMUT chips were functionalized with a polymer—methylated poly(ethylene-imine) (mPEI) synthesized as described previously [69,70]. In numerous previous works, poly(ethylene-imine) (PEI) was tested and shown to be a good absorber of CO 2 [37,71,72,73,74]. Methylated PEI (PEI solution with the primary and secondary amines converted to tertiary) was also shown to be a good absorber of SO 2 , while also capable of capturing CO 2 under humid conditions [70,75].…”

Section: Methodsmentioning

confidence: 99%

Methylated Poly(ethylene)imine Modified Capacitive Micromachined Ultrasonic Transducer for Measurements of CO2 and SO2 in Their Mixtures

Barauskas

Pelenis

Vanagas

et al. 2019

Sensors

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A gravimetric gas detection device based on surface functionalized Capacitive Micromachined Ultrasound Transducers (CMUTs) was designed, fabricated and tested for detection of carbon dioxide (CO2) and sulfur dioxide (SO2) mixtures in nitrogen. The created measurement setup of continuous data collection, integrated with an in-situ Fourier Transform Infrared (FT-IR) spectroscopy, allows for better understanding of the mechanisms and molecular interactions with the sensing layer (methylated poly(ethylene)imine) and its need of surface functionalization for multiple gas detection. During experimentation with CO2 gases, weak molecular interactions were observed in spectroscopy data. Linear sensor response to frequency shift was observed with CO2 concentrations ranging from 0.16 vol % to 1 vol %. Moreover, the Raman and FT-IR spectroscopy data showed much stronger SO2 and the polymer interactions, molecules were bound by stronger forces and irreversibly changed the polymer film properties. However, the sensor change in resonance frequency in the tested region of 1 vol % to 5 vol % SO2 showed a linear response. This effect changed not only the device resonance frequency but also affected the magnitude of electroacoustic impedance which was used for differentiating the gas mixture of CO2, SO2, in dry N2.

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