The removal of heavy metals from wastewater using adsorbants such as w
aste tea, Turkish coffee, exhausted coffee, nut and walnut shells has
investigated. Batch studies were conducted at room temperature and ads
orption experiments were carried out by shaking 0.3 g of adsorbent wit
h 100 ml synthetic wastewater containing Cr (VI), Cd (II) and Al (III)
metal ions. The remaining concentration of heavy metals in each sampl
es after adsorption at various time intervals was determined spectroph
otometrically. Batch studies showed that these adsorbents exhibit a go
od adsorption potential for Al (III) metalions. The adsorption ratios
of Al(III) were as 98, 99, 96, 99.5 and 96% for waste tea, Turkish cof
fee, exhausted coffee, nut and walnut shells, respectively. These resu
lts were compared with those obtained using activated carbon as adsorb
ent. The batch adsorption kinetics and adsorption equilibria were exam
ined and described by a first order reversible reaction and Freundlich
isotherm, respectively. The first order rate and isotherm constants h
ave been calculated.