A mild metal-free non-toxic aerobic photoredox system was found to enable highly efficient desulfurization of 2-mercaptobenzimidazoles. This viable catalytic system includes Rose Bengal in low catalyst loading used as the...
A new inorganic-organic composite dual-coagulant (PAFC-CPAM) was prepared by polyaluminum ferric chloride (PAFC) and cationic polyacrylamide (CPAM) and its treatment efficiency for oily wastewater was evaluated by coagulation jar tests. PAFC-CPAM dual-coagulants were characterized by FT-infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The FTIR spectra illustrated that there were some chemical reactions between PAFC and CPAM in PAFC-CPAM. SEM micrographs testified that PAFC-CPAM formed compact net structure which is different from PAFC and CPAM, resulting to its outstanding coagulation performance other than monomeric coagulant in treating oily wastewater. Coagulation jar tests presented that PAFC-CPAM improved 1.14% and 0.38% of oil removal rate and reduced 0.35NTU and 0.06NTU of residual turbidity than PAFC and CPAM respectively at the optimal dosage of 120mg/L. PAFC-CPAM enhanced 4.56% and 2.12% of oil removal efficiency and decreased 0.27NTU and 0.01NTU of residual turbidity on average in comparison with PAFC and CPAM respectively in the pH range of 4.0-8.0. All of above-mentioned experiment results demonstrated that PAFC-CPAM behaved superior coagulation performance than PAFC and CPAM.
Modified bamboo-charcoal (MBC) was prepared by Ferric sulfate dipping and microwave radiation with 20~30 mesh bamboo-charcoal (BC) pretreated by water boiling as the support. The original and modified BC were characterized by SEM, FTIR, XRD, BET and BJH. Fluoride removal from simulated drinking water containing fluoride was probed into with MBC. The results indicated that MBC took on minor average pore diameter (1.172nm), major microspores and greater specific surface area (99.891 m2/g). Loaded iron combined with BC by bonds from BC such as H-O-H bond, C-O bond and O-H bond. The increase of fluoride removal after BC being modified suggests that MBC is a more potential defluorinate agent.
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