the contamination of water by toxic heavy metals is a world-wide environmental problem. discharges containing cadmium, in particular, are strictly controlled due to the highly toxic nature of this element and its tendency to accumulate in the tissues of living organisms. low concentration (below 5 mg`/l) of cadmium is difficult to treat economically using chemical precipitation methodologies. i...

adsorption capacity of cr (vi) onto cousinia eryngioides boiss, activated carbon was investigated in a batch system by considering the effects of various parameters like contact time, initial concentration, ph, temperature, agitation speed, absorbent dose and particle size. cr (vi) removal is ph dependent and found to be maximum at ph 2.0. the amounts of cr (vi) adsorbed increased with increase...

in lb is research, adsorption of some amino acids and their complenation with manganese (ii) ion on carbonnanotube (mwcnt) by using of four relations langmuir, freundlich. temkin and harkins -jura imitherms wasinvestigated. from this relations. freudlich and temkin relations predict good equilibrium diagram in, isothermcondition. we could compute the theoretical constants by excel software. hy ...

amino acids have been extensively used in several processes of the pharmaceutical and food industries. treatments for the recovery and reuse of the wastewaters generated from these processes are few and little known. this work aims at studying the influence of different variables on the sorption of l-cysteine, contained in aqueous solutions, on clinoptilolite mineral. l-cysteine (cys) was sorbe...

to observe the feasibility of the removal of carmine, peanut husk, an agriculture by-product, was crosslinked with epichlorohydrin in alkaline medium and used for adsorption of carmine from aqueous solution. batch experiments were carried out to study the effects of various parameters such as initial ph, contact time, adsorbent dosage and initial carmine concentration, as well as temperature on...

in this study, nano-tio2 was employed for the adsorption of chloroform from aqueous solution in batch equilibrium experiments to investigate its adsorption properties. the effects of ph, initial chloroform concentration and nano-tio2 dosage were also investigated. optimal conditions for chloroform removal by nano-tio2 have been then identified. results of equilibrium experiments showed that the...

A simple isotherm model has been developed for the type-5 equilibrium adsorption systems by considering the effects of both primary and secondary adsorptive sites. The model was applied to interpret experimental data describing water vapor adsorption capacities of four activated carbon adsorbents for relative vapor pressures from 0.0 to 0.95 and temperatures between 288 and 308 K. Good agreemen...

A simple isotherm model has been developed for the type-5 equilibrium adsorption systems by considering the effects of both primary and secondary adsorptive sites. The model was applied to interpret experimental data describing water vapor adsorption capacities of four activated carbon adsorbents for relative vapor pressures from 0.0 to 0.95 and temperatures between 288 and 308 K. Good agreemen...

background & aims of the study: nitrogenous compounds could directly create many problems for human's health and the environment. thus, removal of nitrogenous compounds is necessary. among the most important problems, decreasing dissolved oxygen, toxicity for aquatics, eutrophication, converting aerobic medium into anaerobic one and corrosion could be noted. the aim of this study was deter...

The phosphoric acid activated Ricinus communis stem carbon (PRCS) is used to degrade methyl red dye from aqueous solution under solar light irradiation studied Physiochemical properties, surface morphology, elemental composition and crystalline nature of PRCS are reported. optimum experimental conditions fixed by optimizing the parameter such as contact time, pH, doses concentration. maximum de...