Porous hydroxyapatite-biochar composites with layered microstructures (SC–HA/C) were prepared by carbonizing sugarcane stem nodes and then soaking them in lime water (NH4)2HPO4 solutions rotation. The surface area of SC–HA/C ranges from 8.52 to 28.44 m2/g, its microstructure inherits various macro-, meso-, micro-pores the cell walls pits vessel walls. maximum removal capacities 11.50, 14.65, 19...

This paper evaluates the degradation of two azo reactive dyes, C.I. Reactive Yellow 84 (RY84) and C.I. Reactive Red 120 (RR120) by photo-Fenton and Fenton-like oxidation. All experiments were performed on a laboratory scale set-up. The effects of different reaction parameters such as initial pH, contact time, effect of light and hydrogen peroxide concentrations on the oxidation of the dye aqueo...

in order to study the cu(ii) ion selective electrode, an optimized membrane was prepared by mixing of 30 mg of pvc powdered, 5 mg of considered ionophore, 60 mg of plasticizer and 5 mg of additive. the sensor showed a near nernstian response for cu(ii) ions over a concentration range from 1.0×0-6 –1.0×0-2 m with a slope of 28.90.5 mv per concentration decade with a working ph range of 3.5-6.3. ...

the electrochemical behavior of a modified carbon paste electrode (mcpe) with n,n′ethylenbis(salicylideneiminato)copper(ii) complex ([cu(ii)-salen]) was investigated as a newsensor for cystein. the britton-robinson buffer with ph 5, 10% modifier in electrode, potentialscanning rate of 20 mvs-1 and puls height of 50 mv were used as the optimum condition for thedetermination of cysteine using car...

The present study investigates an NF process for removal of copper and hexavalent chromium, studying the effect of pH (5, 7, 9) as well as contaminants' concentration (50, 500, 5000 µg/L) at a constant pressure of 8 bar; with the recovery rate, regulated at 75±2%. To determine the main factors, affecting the system performance, and evaluate the interaction effects among the factors, the experim...

During the last years our research group has been studying the use of industrial vegetable wastes as grape stalks and exhausted coffee to remove metals ions such as Ni(II), Cu(II), Pb(II), Zn(II), Cd(II) or Cr(VI) and Cr(III) in aqueous solution from the point of view to use these wastes as biosorbents in a low cost alternative to activated carbon for wastewater treatment. The optimal experimen...

The rate constants of the reactions between pulse radiolytically produced superoxide radicals and the Cu(II) chelate of diethyldithiocarbamate were determined at pH 7.0. It was found that diethyldithiocarbamate forms a copper complex, which as no dismutating activity. The removal of the protein bound copper in superoxide dismutase by diethyldithiocarbamate yields the same effect as coordination...

Abstract Heavy metals eradication from water is a complicated subject, therefore viable, resilient, and green technology imperative. metal removal can be accomplished through easy access, economical, efficient sorbents derived agricultural waste. In the current study, palm kernel shell (PKS) waste was converted into biochar (PKSC) via pyrolysis. Chemical modification performed on PKSC acid-base...

Hydrogen peroxide is an environmentally friendly bleaching chemical that widely used in alkaline media the pulp and paper industry. In this study, unconventional reaction conditions of conventional P-stage were performed to evaluate its effect on cellulose. The objective was “tailor” cellulose degradation according different applications, such as dissolving pulps. Different operating studied: p...