Mixed-Matrix Organo-Silica-Hydrotalcite Membrane for CO Separation Part 1: Synthesis and Analytical Description.

Hydrotalcite exhibits the capability to adsorb CO at elevated temperatures. High surface area and favorable coating properties are essential to harness its potential for practical applications. Stable alcohol-based dispersions are needed for thin film applications of mixed membranes containing hydrotalcite.

Mixed-Matrix Organo-Silica-Hydrotalcite Membrane for CO Separation Part 2: Permeation and Selectivity Study.

This study introduces an innovative approach to designing membranes capable of separating CO from industrial gas streams at higher temperatures. The novel membrane design seeks to leverage a well-researched, high-temperature CO adsorbent, hydrotalcite, by transforming it into a membrane. This was achieved by combining it with an amorphous organo-silica-based matrix, extending the polymer-based mixed-matrix membrane concept to inorganic compounds.

Impact of the use of waste on trace element concentrations in cement and concrete.

The results of model calculations carried out to identify and quantify the input pathways of trace elements into cement and concrete and to estimate the extent to which trace element concentrations in cement may change due to waste utilization are presented. As expected, primary raw materials represented the most important input pathway for trace elements into cement, but the contribution from wastes was not negligible. The use of waste led to a slight increase of the concentrations of cadmium, antimony and zinc in cement.