Characterization and evaluation of ZnO/CuO catalyst in the degradation of methylene blue using solar radiation

Biodiesel production on bench scale from different sources of waste oils by using NiZn magnetic heterogeneous nanocatalyst

“…Surface defects of nanomaterials can serve as active sites for adsorption and chemical transformations in heterogeneous catalysis 90 . In addition, the positive values of the zeta potential indicate the largest number of positive charges on the solid surface, which attract negative counter ions among them (OH) group, which can thus capture the vacancy generating of catalysis, leading to the formation of (*OH) radicals responsible for indirect catalysis 58,91,92 . In this work, the zeta potential is indicated to be the most effective property that contributes to catalytic performance.…”

“…According to Figure 5, it is possible to observe some sudden decreases in certain wavelengths, which indicate the presence of band intervals, allowing to propose that the Ni 0.5 Zn 0.5 Fe 2 O 4 nanoparticles absorb in the ultraviolet region as well as in the visible region. The fact that a catalyst absorbs in both regions favors the transfer of electrons and, consequently, the generation of hydroxyl radicals (OH•), 58,59 which with their free valences act as active sites. In the catalysis for biodiesel production, the hydroxyl radical of the catalyst abstracts hydrogens from fatty acid side chains initiating the lipid peroxidation.…”

Facile Synthesis of CuO Nanosheets and Efficient Degradation of Rhodamine B in a Copper Oxide/Ascorbic Acid/Hydrogen Peroxide System: Kinetics, Fate of Ascorbic Acid, and Mechanism

“…Table presents a comparison of the catalytic performance between the current system and other studies . Although different copper‐based catalytic systems show their unique characteristics, when the results were normalized to the same scale, the current system exhibited an obvious advantage.…”

Preparation of hyper-cross-linked hydroxylated polystyrene for adsorptive removal of methylene blue

“…Therefore, MB needs to be removed from waste water before discharge. Many methods, including membrane ltration, [1][2][3] bio-degradation, [4][5][6] electro-catalytic or photo-catalytic degradation, [7][8][9][10][11] and liquid-liquid extraction, 12 are applied to remove MB from water, but the high operation cost of these methods limits their application in practice, especially at a large scale. Adsorptive separation is a competitive technology for removal of dyes from waste water, and several adsorbents such as mesoporous silica, 13 clay, 14,15 modied graphene, 11,16 biomass 17,18 and activated carbon [19][20][21] have been reported to remove MB from water.…”