Photocatalytic degradation of aniline with boron-doped cryptomelane type manganese oxide

Abstract

The effect of boron doping on the photocatalytic activity of manganese (Mn) oxide in aniline degradation was investigated. Mn oxide was synthesized by the reaction of MnCl 2 with KMnO 4 and boron-doped Mn oxide (occluded-B-Mn oxide or oc-B-Mn oxide) was prepared by the reaction of MnCl 2 with KMnO 4 in the presence of boric acid. The structural formulas of the Mn oxide and the oc-B-Mn oxide were K 0.04 MnO 1.90 (H 2 O) 0.54 and K 0.04 B 0.01 MnO 1.87 (H 2 O) 0.61 , respectively. Their physicochemical properties were characterized by XRD, TEM, BET and UV-Vis absorption spectra. The photocatalytic activity was evaluated by aniline degradation in aqueous catalyst dispersions under UV light radiation. Discussion of the results showed that the higher photocatalytic activity of the oc-B-Mn oxide may be attributed to the synergetic effect of light absorption, the specific surface area and the suppression of recombination of electron-hole pair.

The use of boron isotopes to evaluate boron uptake by rape grown in acid soil treated with boron containing goethite

“…Recently, studies of the properties and reactivity of adsorbed (surface) and occluded (inner) B in goethite and manganite have been conducted. These synthetic minerals were used to simulate B‐containing oxides in soil, had relatively high heterogeneous activity ( Liao et al, 2007; Liu et al, 2010; Liao et al, 2011c), and influence the B fraction in soil ( Ren et al, 2014). Boron‐containing oxides can also mitigate toxicity of acid soil and have high B uptake efficiency by rape seedlings ( Liao et al, 2011a, 2011b; Cui et al, 2010; Ren et al, 2009, 2010, 2014).…”