Highly efficient and reversible adsorption of ammonia by incorporation of deep eutectic solvents into silica gel and Al₂O₃

Abstract

The uptake of NH3 in the industrial tail gas will improve environmental quality for human health and ecology. Adsorption separation has the advantages of simple operation and low energy consumption....

Demethylation of Waste Alkali Lignin for Rapid and Efficient Ammonia Adsorption

“…Although these adsorbents have demonstrated favorable adsorption outcomes, they exhibit certain drawbacks such as complexity, high cost, low yield of prepared adsorbents, and limited separation selectivity, making them less suitable for industrial applications. 27 Our research group has recently synthesized three sulfonated phenol-formaldehyde resins that feature aromatic hydroxyl (Ar−OH) and sulfonate groups as acid sites to facilitate NH 3 adsorption. 33 Alkali lignin, which consists of H, G, and S units, contains a substantial amount of methoxy and hydroxyl groups attached to aromatic rings.…”

“…The choice of the adsorbent plays a critical role in the process. Various adsorbent materials, including carbon-based adsorbents, − alumina, silica, , and metal-organic frameworks (MOFs), ,,− have been developed and modified to functionalized surfaces and porous structures, allowing for effective removal of NH 3 . For instance, Wang et al used the MOF MIL-53-(OH) 2 as a base material and incorporated lithium chloride within its nanopore channels to achieve high-performance heterogeneous MOF adsorbents for NH 3 capture.…”

“…For instance, Wang et al used the MOF MIL-53-(OH) 2 as a base material and incorporated lithium chloride within its nanopore channels to achieve high-performance heterogeneous MOF adsorbents for NH 3 capture. Although these adsorbents have demonstrated favorable adsorption outcomes, they exhibit certain drawbacks such as complexity, high cost, low yield of prepared adsorbents, and limited separation selectivity, making them less suitable for industrial applications . Our research group has recently synthesized three sulfonated phenol-formaldehyde resins that feature aromatic hydroxyl (Ar–OH) and sulfonate groups as acid sites to facilitate NH 3 adsorption .…”