Arsenic Adsorption on Copper–Palladium Alloy Films

Abstract

The adsorption of arsine by copper−palladium alloys was studied using a high-throughput composition spread alloy film (CSAF) sample library. A Cu x Pd 1−x CSAF coupon that spanned the complete alloy composition space (x = 0−1) was prepared by an evaporative deposition technique. The coupon was exposed to AsH 3 in a N 2 background at 288 °C in a small flow reactor. Arsenic uptake was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy (SEM-EDX), and micro X-ray diffraction (μ-XRD). Pd-and Cu-rich alloy compositions exhibited large surface concentrations of As after exposure to AsH 3 . In the Cu-rich alloy, composition and structure measurements suggest the formation of a Cu 3 As phase. Arsenic uptake at Pd-rich alloy compositions is consistent with Pd 2 As or Pd 8 As 3 phases; structural results suggest Pd 2 As with a hexagonal structure. In contrast, over a wide range of intermediate compositions (x Cu ≈ 0.20−0.75), little As uptake was observed. These results contribute to a basis for rational design of sorbents for the capture of arsenic from fluid streams, and to an understanding of the stability of palladium−copper alloy membranes employed for hydrogen separation from coal-derived syngas. This work illustrates the application of high-throughput approaches based on CSAF sample libraries that can be applied to a wide variety of materials development and optimization challenges.

Recyclable Naturally Derived Magnetic Pyrrhotite for Elemental Mercury Recovery from Flue Gas

“…Meanwhile, future research will focus upon the potential application of the sorbent to other gas streams containing mercury, such as coal-derived syngas, 43,44 as well as the capture of other trace contaminants such as arsenic. 45,46 ■ ASSOCIATED CONTENT * S Supporting Information…”

Cu‐Based Nanoparticles as Emerging Environmental Catalysts

“…Finally, the catalyst shows new impact with enhanced catalytic activity towards environmental applications. Moreover, several seminal works have been reported in the literature on the application of bimetallic catalytic systems of Cu with noble metal for reactions of environmental concern . Roy and co‐workers described a facile one pot route to design Cu/Ag bimetallic NPs.…”

Investigation of the Role of Copper Species-Modified Active Carbon by Low-Temperature Roasting on the Improvement of Arsine Adsorption

“… 7 For instance, Lin et al 8 determined the optimal parameters of AsH 3 removal by CuZnAl hydrotalcite-like adsorbents with calcination at 500 °C and a hydrothermal temperature at 105 °C. Uffalussy et al 9 performed adsorption of AsH 3 by the Cu–Pd alloy using a high-throughput composition spread alloy film sample library. Jiang et al 10 noticed that a reaction temperature of 60 °C and an oxygen content of 4% allowed Co/Cu/Ac to effectively adsorb AsH 3 after calcination at 400 °C with the adsorption capacity of AsH 3 reaching 35.7 mg/g.…”