2 research outputs found
Efficient Removal of Hg<sup>0</sup> from Flue Gas Using Sulfur Site-Rich CuIn<sub>5</sub>S<sub>8</sub>‑Modified Graphitic Carbon Nitride Adsorbents: Performance, Kinetics, and Mechanism Study
Mercury
emissions from coal combustion flue gas pose significant
risks to ecosystems and human health. In this work, a novel adsorbent
was developed for efficient removal of Hg0 from coal-fired
flue gas. The adsorbent consisted of bimetallic sulfide CuIn5S8 with multiple active sulfur (S) sites incorporated
into graphitic carbon nitride(g-C3N4). The resulting
20CuIn5S8/g-C3N4 (20CIS/CN)
composite exhibited outstanding Hg0 removal capacity, achieving
over 99% adsorption efficiency at temperatures of 80 and 120 °C.
Even after continuous adsorption for more than 10 h, the adsorption
efficiency remained at approximately 89%. At higher temperatures of
160 and 200 °C, the efficiency remained high at 97.56 and 89.11%,
respectively. Importantly, the inhibitory effect of SO2 and NO in the flue gas on the Hg0 adsorption efficiency
of 20CIS/CN was minimal. Adsorption capacity at adsorption equilibrium
of 20CIS/CN (15.088 mg/g) was 14.2 times higher than that of a commercial
activated carbon adsorbent (1.06 mg/g). The adsorption mechanism was
investigated by density functional theory (DFT), revealing the stability
of the In–S–Hg six-coordinated octahedral structure
on the CuIn5S8(0 0 1) surface. Experimental,
XPS, and Hg-TPD analyses supported the proposed mechanism, demonstrating
the transformation of Hg0 into stable HgS through interaction
with abundant reactive S sites on the CuIn5S8 surface. These findings highlight the exceptional adsorption capacity
of 20CIS/CN composites and their potential as a replacement for traditional
commercial adsorbents. The development of modified adsorbents with
abundant S-active sites for efficient Hg0 adsorption in
flue gas can contribute to effective environmental remediation strategies
Design and Application of a DNA-Encoded Macrocyclic Peptide Library
A DNA-encoded
macrocyclic peptide library was designed and synthesized
with 2.4 × 10<sup>12</sup> members composed of 4–20 natural
and non-natural amino acids. Affinity-based selection was performed
against two therapeutic targets, VHL and RSV N protein. On the basis
of selection data, some peptides were selected for resynthesis without
a DNA tag, and their activity was confirmed