Solution Plasma-Assisted Green Synthesis of MnO₂Adsorbent and Removal of Cationic Pollutant

Abstract

In this study, we proposed the solution plasma- (SP-) assisted green synthesis method using plants extracts, i.e., glucose, with the expectation of acting as a reducing agent and promotor for the formation of powder state of nanostructured MnO2. MnO2 was simply and rapidly synthesized within 10 min by the SP-assisted method. The structural features and morphology of as-synthesized MnO2 were characterized by XRD, Raman, FE-SEM, and TEM analyses. For potential application of as-synthesized MnO2, cationic dye, i.e., methylene blue (MB), removal performance was investigated by batch experiment at an initial concentration of C0 = 100 mg L−1. The obtained MnO2 exhibited effective dye removal ability given high C0, and simultaneously applied plasma discharging further enhanced removal efficiency. These contributions therefore open a new window not only on a powerful and environmentally benign synthesis route for efficient adsorbents but also on supporting multiple removal mechanism.

Synthesis of Silver Nanoparticles Using Orange Peel Extract Prepared by Plasmochemical Extraction Method and Degradation of Methylene Blue under Solar Irradiation

“…ese conventional or more innovative extraction techniques may either cause the degradation of the targeted compounds due to high temperature and long extraction times as in solvent extractions or pose some health-related risks due to the unawareness of safety criteria during irradiation. e newest method of processing homogeneous and heterogeneous systems, including plant material, is plasma discharges of various configurations [17,18]. Among plasmochemical discharges, the contact nonequilibrium low-temperature plasma (CNP) is a promising option from the point of view of practical applications.…”

Vertical Graphene Film Enables High-Performance Quasi-Solid-State Planar Zinc-Ion Microbatteries

“…The Raman bands between 200 and 700 cm –1 can be ascribed to the intrinsic vibration modes of MnO 2 . Three main peaks are marked with v 1 to v 3 , which are close to 508, 562, and 641 cm –1 , respectively, corresponding to the birnessite-type MnO 2 . − Figure c shows the EDX pattern of MnO 2 @VG; the ratio of the number of atoms of O to Mn is nearly 2:1. The full XPS spectrum of MnO 2 nanosheets is shown in Figure d, which displays the signals of Mn, O, and C. The Mn 2p spectrum in Figure e exhibits two peaks at 642.2 and 653.9 eV with a spin-energy separation of 11.7 eV, corresponding to the Mn 2p 3/2 and Mn 2p 1/2 , respectively, which are consistent with the signal of Mn 4+ .…”

Catalytic Decomposition of Residual Ozone over Cactus-like MnO2 Nanosphere: Synergistic Mechanism and SO2/H2O Interference

“…Figure S2 represented the standard XRD patterns of JCPDS 44-0141 (α-MnO 2 ), 38 JCPDS 24-0735 (pyrolusite, β-MnO 2 ), 39 JCPDS 14-0644 (nsutite, γ-MnO 2 ), 40 and JCPDS 52-0556 (birnessite-type potassium MnO 2 , δ-MnO 2 ). 41 , 42 The diffraction pattern for the MnO 2 -I sample exhibits typical characteristic peaks at 12.8, 18.1, 28.8, 37.5, 42.0, 49.9, 60.3, and 69.7°, corresponding to (110), (200), (310), (211), (301), (411), (521), and (541) planes of α-MnO 2 , respectively. The MnO 2 -II sample exhibits sharp peaks at 28.7, 37.3, 42.8, 56.7, 59.4, and 72.3° corresponding to (110), (101), (111), (211), (220), and (301) planes of β-MnO 2 , respectively.…”