The adsorption of hexamine onto powdered activated carbon from aqueous solutions was studied in a fixed bed system. Langmuir, Freundlich, Redlich-Peterson and Toth isotherm models were used to fit the experimental data and isotherm parameters were determined. The results revealed that the adsorption isotherm models fitted the data in the order of Langmuir [ Toth [ Redlich-Peterson [ Freundlich. Lagergren pseudo-first order kinetic model was found to correlate well with the experimental data. The effects of solution pH, temperature, initial hexamine concentration and added salts concentration on the adsorption capacity and the rate of adsorption were studied. The results indicate that the rate of adsorption increases and then decreases as temperature of the hexamine solution increases, however, the adsorption capacity decreases. The addition of low concentration of salt significantly increases the adsorption capacity of activated carbon. The results showed that the activated carbon has potential for the adsorption of hexamine from industrial hexamine wastewater.

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The present study reports a novel red phosphorus (RP)/Co 3 O 4 –CuO hybrid as a high-performance anode material for lithium ion battery that was successfully synthesized by simple sol gel method and followed by facile ball milling of red phosphorus. Herein, we outstandingly improved practical application of RP anode (with its natural insulation property and rapid capacity decay in during the lithiation process) in lithium-ion batteries (LIBs) by confining nanosized amorphous RP into the Co 3 O 4 –CuO nanoparticle while RP can improve the electrochemical capacity returning and increased capacity of composite in high current density. This bonding can help maintain electrical contact, prevent to escape RP from the electrode and confirm the solid electrolyte interphase upon the large volume change of RP during cycling. As a result, by judicious usage of components in the RP/Co 3 O 4 –CuO hybrid nanostructured anode was achieved an initial Coulombic efficiency of 99.8% at a current density of 50 mA g –1 and an enhanced cycling stability (683.63 and 470.11 mAh g –1 after 60 cycles at a density of 0.1 and 1 A g 1– ) with interesting cycling capacity at high current density of 3 Ag 1– (333.81 mAh g –1 ). Moreover, the composite electrode can still deliver a specific capacity of about 97.4% of initial capacity after cycling at high rates and returning to the initial current density of 0.1 A g 1– .