Increasing concentrations of greenhouse gases (GHGs) such as CO₂in the atmosphere is a global warming. Human activities are a major cause of increased CO₂concentration in atmosphere, as in recent decade, two-third of greenhouse effect was caused by human activities. Carbon capture and storage (CCS) is a major strategy that can be used to reduce GHGs emission. There are three methods for CCS: pre-combustion capture, oxy-fuel process, and post-combustion capture. Among them, post-combustion capture is the most important one because it offers flexibility and it can be easily added to the operational units. Various technologies are used for CO₂capture, some of them include: absorption, adsorption, cryogenic distillation, and membrane separation. In this paper, various technologies for post-combustion are compared and the best condition for using each technology is identified.

Composite of activated carbon and Fe ₂ O ₃ nanoparticles was synthesized as a novel adsorbent for nitrate removal.

The main mechanisms by which nanoparticles influence the bone microniche to direct osteogenesis. Nanoparticles modulate immune responses, induce osteogenic and angiogenic differentiation while suppressing osteoclast activity and differentiation.

Recently, a great deal of attention has been paid to water treatment using nanoparticles such as ferric nanoparticles. In this work, a ferric oxide-hydroxide–activated carbon nanocomposite (Fe–AC) was synthesized via a simple and low- temperature method and characterized using BET, XRF, FTIR, XRD and SEM techniques. In order to compare the performance of commercial activated carbon (CAC) and Fe–AC for vanadium ion adsorption, the influences of various adsorption parameters such as pH, contact time, initial concentration of vanadium and temperature were investigated. The kinetic data confirmed the validity of the pseudo-second-order kinetic model for CAC and Fe–AC. The sorption isotherms were studied using Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models. The equilibrium data was described with significant accuracy by using the Freundlich model. The results showed that CAC had a vanadium ion adsorption capacity of 37.87 mg g⁻¹, while Fe–AC was able to adsorb 119.01 mg g⁻¹ of vanadium. The determination of different thermodynamic parameters indicated that the vanadium ion adsorption was feasible and spontaneous and that both adsorbents had an exothermic nature.