Understanding the role of each ingredient in a basic copper carbonate based impregnation recipe for respirator carbons

Investigation of copper oxide impregnants prepared from various precursors for respirator carbons

“…It is known that when Cu 2+ is used to adsorb HCN, additional materials containing chromium, molybdenum or tungsten must be added to capture the NCCN gas [6,7,18,24]. Work involving the addition of molybdenum and tungsten compounds to CuO-based IAC samples similar to those discussed here has been reported in recent publications [25,26].…”

MCM-41 impregnated with active metal sites: Synthesis, characterization, and ammonia adsorption

“…The metals, which have the potential for interacting strongly with ammonia, were zinc, copper (I and II), and iron (II and III) [5,[18][19][20]22,[29][30][31][32] The anions include the sulfates, carbonates, nitrates, and chlorides of the metals. These pairs resulted in impregnating a total of 14 different metal salts into the MCM-41.…”

“…Metal salts that have been studied specifically for ammonia removal include zinc chloride [20] and basic copper carbonate [22]. Sulfate containing compounds have also recently been studied for their effects on ammonia removal [23].…”

A combinatorial approach to screening carbon based materials for respiratory protection

“…In order to avoid potential damage to the robot, we decided to pre-treat the carbon with nitric acid (as described in Section 2.3) instead of including a nitric acid dispense. The use of HNO 3 -treated GC for this study ensured even dispersion of the impregnants on the surface of the activated carbon generating nanoscale-sized impregnants as shown from previous studies [14,36]. HNO 3 -treated GC was also found to aid in the adsorption of NH 3 [14,37].…”