Progress in absorption of environmental carbon dioxide using nanoparticles and membrane technology

This review mainly focuses on different types of absorbers that absorb CO2 emitted primarily from stationary point sources such as refineries, various industries and power plants. Absorption of CO2 by nanofluids, nanocrystals and by two types of membranes: namely, hollow fibre membrane and omniphobic membrane to reduce CO2 emission at the point source are discussed. Potential applications of the omniphobic membrane as CO2 absorbers are also highlighted. The applications of nanofluids for the absorption of CO2 in presence of nanoparticles made up of SiO2 and Al2O3 are also discussed. Moreover, the absorption of CO2 by nanocrystals like amin-based cellulose nanocrystals and amino silane-grafted cellulose nanocrystals are discussed. The present review is divided into four sections; the first section covers the introduction, in the second section different types of membranes for CO2 absorption their properties and designs are discussed, the third section describes the applications of various nanocrystals towards CO2 absorption and the fourth section nanofluids, their absorption capacities and different properties like bubble visualization are discussed. In future researchers need to focus on the modification of membrane as well nanomaterials used in the development of absorption of CO2 gas, by improving the active mass transfer, flow rate of absorbent, membrane mass flux etc. This can be done by doping metals for the formation of suitable nanofluids and nanocrystals. Furthermore, formation of nanocomposites by using suitable nanomaterials for the preparation of highly efficient membrane for CO2 capture technologies are discussed. [GRAPHICS] .

Automated summary

This review article focuses on different types of absorbers for capturing CO2 emissions from stationary point sources. It discusses the absorption of CO2 by nanofluids, nanocrystals, and two types of membranes - hollow fibre membrane and omniphobic membrane. The potential applications of omniphobic membrane as CO2 absorbers are also highlighted. The use of nanofluids with SiO2 and Al2O3 nanoparticles for CO2 absorption and CO2 absorption by nanocrystals such as amin-based cellulose nanocrystals and amino silane-grafted cellulose nanocrystals are discussed. The article is divided into four sections covering introduction, membrane types and designs, nanocrystals applications, and nanofluids properties. Future research should focus on modifying membranes and nanomaterials to improve the absorption of CO2 gas.