Fabrication of novel particle electrode γ-Al2O3@ZIF-8 and its application for degradation of Rhodamine B

Abstract

Due to the high Brunauer–Emmett–Teller (BET) surface area of zeolitic imidazolate framework (ZIF)-8, a secondary crystallization method was used to prepare a particle electrode of γ-Al2O3@ZIF-8. According to the results from a field emission scanning electron microscope (SEM) and X-ray diffractometer (XRD), the particle electrode of γ-Al2O3 was successfully loaded with ZIF-8, and the BET surface area (1,433 m2/g) of ZIF-8 was over ten times that of γ-Al2O3. The key operation parameters of cell voltage, pH, initial RhB concentration and electrolyte concentration were all optimized. The observed rate constant (kobs) of the pseudo-first-order kinetic model for the electrocatalytic oxidation (ECO) system with the particle electrode of γ-Al2O3@ZIF-8 (15.2 × 10−2 min−1) was over five times higher than that of the system with the traditional particle electrode of γ-Al2O3 (2.6 × 10−2 min−1). The loading of ZIF-8 on the surface of γ-Al2O3 played an important role in improving electrocatalytic activity for the degradation of Rhodamine B (RhB), and the RhB removal efficiency of the three-dimensional (3D) electrocatalytic system with the particle electrode of γ-Al2O3@ZIF-8 was 93.5% in 15 min, compared with 27.5% in 15 min for the particle electrode of γ-Al2O3. The RhB removal efficiency was kept over 85% after five cycles of reuse for the 3D electrocatalytic system with the particle electrode of γ-Al2O3@ZIF-8.

Treatment of organic matter and ammonia nitrogen in wastewater by electrocatalytic oxidation: a review of anode material preparation

“…Zhang et al 83 prepared particle electrodes using γ-Al 2 O 3 as a carrier. First, γ-Al 2 O 3 particles were ultrasonically washed three times with deionized water and baked in a Muffle furnace at 100 °C for 6 h. Afterward, 3.3 g of 2-methylimidazole was added to 70 mL methanol and poured into an equalvolume solution containing 1.5 g of Zn(NO 3 ) 2 •6H 2 O.…”

“…Zhang et al 83 prepared particle electrode γ-Al 2 O 3 @ZIF-8 by secondary crystallization. The Ti/RuO 2 electrode and Ti electrode were used as the anode and cathode, respectively.…”

Nitrogen-Doped Graphene Iron-Based Particle Electrode Outperforms Activated Carbon in Three-Dimensional Electrochemical Water Treatment Systems

“…For example, Li et al [5] used a ceramic particle electrode for the electrochemical degradation of 2-diethylamino-6-methyl-4-hydroxypyrimidine in a three-dimensional electrode reactor. There are also reports showing that the combination of metals and ceramic materials as particle electrodes could be effective in promoting 3D-electrochemical water treatment processes [6][7][8].…”