Carbon nanoflake hybrid for biohydrogen CO ₂ capture: Breakthrough adsorption test

Abstract

Summary Biohydrogen gas is a hot topic for H2 fuel at present. However, removal of the unwanted CO2 through adsorption is required before any system is supplied with high‐purity H2 gas. Herein, we prepared a novel carbon nanoflake hybrid for efficient biohydrogen CO2 capture by combining the advantages of carbon, metal oxide, and amine. Among the samples, SH800 showed a remarkable high CO2 adsorption capacity of 29.8 wt.% (6.77 mmol/g) at 25°C and 1 atm, the highest ever reported at low pressure and temperature. The regeneration experiment also demonstrated robust reversibility over five cycles in the absence of heat treatment. Moreover, it displayed a highly accessible adsorption site with a Brunauer‐Emmett‐Teller (BET) surface area of 600 m2/g and an optimal 6.6‐nm average mesopore structure. Another hybrid named SH500 was also developed. This hybrid showed a comparable CO2 uptake of 27.8 wt.%, being competitive to SH800 but with entirely different chemical properties. Both samples were analyzed by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET, Fourier transform infrared spectroscopy (FTIR), X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy, (XPS) and were tested for CO2 capture through a breakthrough experiment. A highly porous solid adsorbent was also produced via soft‐template synthesis. In summary, the correct amount of dynamic factors, such as high surface area, mesopore‐micropore morphology, activation temperature, metal hybridization, and N moieties, played a major role in the carbon engineering of CO2 adsorbent.

Synthesis of porous materials by the modification of coal fly ash and its environmentally friendly use for the removal of heavy metals from wastewater

“…The modification of CFA by NaOH-HCl-NaOH has increased the surface area by six times. It is concluded that the large surface area of the adsorbent increased the adsorption process because the reaction of basic and acidic solutions with CFA increased the active site (Anuar, 2020). The surface area was increased due to the transformation of dense spherical structure to an amorphous wool-like structure under the combined physiochemical effects.…”

Facile Preparation of Carbon Nitride-ZnO Hybrid Adsorbent for CO2 Capture: The Significant Role of Amine Source to Metal Oxide Ratio

“…The CO 2 capture test was done through a breakthrough experiment, as in previous study [37]. In summary, the sample was packed into a column before being connected to gasflowmeter-sample-CO 2 analyzer system.…”

Photocatalytic membrane reactor for simultaneous separation and photoreduction of CO 2 to methanol

“…The positive impact is an enhancement in the production of methanol, which is the result of increasing the active site of photocatalyst and photon generation through the photocatalytic process. On the other hand, its negative effect is the consumption of more photocatalyst that reduced the methanol production yield based on Equation (6). However, increasing the methanol concentration was negligible compared with increasing the photocatalyst consumption.…”

“…Currently, the most popular technologies for CO 2 separation from the gas mixture are adsorption, absorption, membrane separation, and so on 6‐8 . Among these methods, membrane application in CO 2 separation has attracted considerable interest because of the advantages, including, easy scaling up and simple operating control 9‐12 .…”

“…5 Currently, the most popular technologies for CO 2 separation from the gas mixture are adsorption, absorption, membrane separation, and so on. [6][7][8] Among these methods, membrane application in CO 2 separation has attracted considerable interest because of the advantages, including, easy scaling up and simple operating control. [9][10][11][12] Besides CO 2 separation from the gas mixture that improves the natural gas quality, conversion, or reutilization of the CO 2 content to valuable fuels is also considered to be interesting and feasible route.…”