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Study on the efficacy and mechanism of treatment of manganese-containing wastewater by pulse-alternating current coagulation.
Environ Technol
May 2024
Hunan Automotive Engineering Vocational College, Zhuzhou, People's Republic of China.
To assess the effectiveness and underlying mechanism of pulse-alternating current coagulation (PACC) for treating manganese-laden wastewater, we examined the influence of various parameters. Specifically, we investigated the impact of current density, initial pH, initial Mn concentration, electrolyte concentration, and alternating current frequency on the removal efficacy. The removal mechanism was meticulously examined using an adsorption kinetics analysis, Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS), Fourier Transform Infrared Spectrum (FTIR), and X-ray Photoelectron Spectroscopy (XPS).
View Article and Find Full Text PDFSingle-Atoms on Crystalline Carbon Nitrides for Selective C─H Photooxidation: A Bridge to Achieve Homogeneous Pathways in Heterogeneous Materials.
Adv Mater
December 2023
Department of Chemistry, Federal University of São Carlos, São Carlos, São Paulo, 13565-905, Brazil.
Single-atom catalysis is a field of paramount importance in contemporary science due to its exceptional ability to combine the domains of homogeneous and heterogeneous catalysis. Iron and manganese metalloenzymes are known to be effective in C─H oxidation reactions in nature, inspiring scientists to mimic their active sites in artificial catalytic systems. Herein, a simple and versatile cation exchange method is successfully employed to stabilize low-cost iron and manganese single-atoms in poly(heptazine imides) (PHI).
View Article and Find Full Text PDFStartup performance and microbial composition of a pilot-scale rapid sand filter for the treatment of manganese-containing mine water.
Chemosphere
December 2023
Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba, Ibaraki, 305-8569, Japan. Electronic address:
The inexpensive removal of soluble manganese [Mn(II)] from mine water that contains large quantities of Mn(II) should be prioritized given that large quantities of alkaline reagents are typically used in the chemical treatment of Mn-rich water from abandoned mines. Rapid sand filter (RSF) systems are widely used as a cost-effective technology in drinking water treatment processes to remove iron and Mn from groundwater. Here, we applied a pilot-scale RSF to treat mine water with a neutral pH and containing approximately 22 mg/L of Mn(II).
View Article and Find Full Text PDFEnzymatic Hydroxylation of Aliphatic C-H Bonds by a Mn/Fe Cofactor.
bioRxiv
March 2023
Department of Chemistry, University of California, Berkeley; Berkeley, CA 94720, USA.
Manganese cofactors activate strong chemical bonds in many essential enzymes. Yet very few manganese-dependent enzymes are known to functionalize ubiquitous carbon-hydrogen (C-H) bonds, and those that catalyze this important reaction display limited intrinsic reactivity. Herein, we report that the 2-aminoisobutyric acid hydroxylase from requires manganese to functionalize a C-H bond possessing a bond dissociation enthalpy (BDE) exceeding 100 kcal/mol.
View Article and Find Full Text PDFGenome-wide identification and analysis of genes in soybean cultivar "Zhonghuang 13".
Front Genet
October 2022
Key Laboratory of Soybean Biology of Chinese Education Ministry, Northeast Agricultural University, Harbin, China.
Lipoxygenases (LOXs; EC1.13.11.
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