Abstract. This study focusing in producing activated carbon (AC) from honeydew rind, a low-cost agricultural by-product, by chemical activation using H 2 SO 4 used as an adsorbent for the removal of zinc ions from aqueous solutions. Preparation method on the effect of surface morphology at different carbonization temperatures 450 o C, 470 o C, 490 o C and 510 o C was studied. The AC was characterized using FEM-SEM, FTIR and TG. Batch adsorptions were carried out to optimize different variables such as zinc concentration, contact time, pH and biosorbent amount. AAS analysis showed that the maximum adsorption of zinc onto honeydew rind AC was achieved at the conditions of pH 7.5, 1.5g biosorbent amount, 1000mg/L initial zn concentration and 45min contact time. The maximum metal uptake and maximum removal were 66.55mg/g and 99.79% respectively.
IntroductionThe persistent and non biodegradable of heavy metals had triggered in depth study on removal of heavy metals in the receiving environmental. Zinc (Zn) is one of heavy metals residues from various massive chemical industries such as batteries, tanneries, metal plating, agrochemicals, petrochemicals and mining [1,2]. Daily recommended dose of Zn for men, women, children and infant is 15mg, 12mg, 10mg and 5mg respectively [3]. The residue of Zn enters the environment mainly through water stream as untreated wastewater. People who live near waste sites containing are likely to be exposed to zinc through breathing, drinking contaminated drinking water and the polluted water. There is therefore essential to remove this metal from wastewater in order to prevent from entering natural water bodies by polluted water containing the harmful metal [4,5].At present, a list of technologies have been designed and employed for heavy metal removal purpose namely precipitation, biological treatment, membrane-filtration process, fenton reagent and adsorption [6,7]. Despite of the efficiency in pollutants removal these methods have significant disadvantages, such as high chemical and energy requirements, hazardous sludge formation, low efficiency at low concentration of pollutants and high cost at large scale [8]. Nevertheless, despite of high cost of operational, adsorption using AC as adsorbent is the most efficient technique and produces the least drawbacks. Hence there is a new interest among researchers on exploring alternative precursor to produce a low cost adsorbent for wastewater treatment.Activated carbons (AC) are principally amorphous solids with large internal surface areas and pore volumes. This characteristic fit to many applications such as separation and purification technologies, catalytic processes, decolorization and wastewater treament [9,10]. To date, due to their adsorptive capacity, AC has been well known in the sorption of chemical species from aqueous solutions as adsorbent [11]. In spite of the fact that charcoal has been the oldest adsorbent known in wastewater treatment but the cost of operational of commercial ACs from this material is still high at US$2...