Studies on adsorption of crystal violet dye from aqueous solution onto coniferous pinus bark powder.pdf

S o R E a A R R A A K A C C T D 1 c a p g fi o d g n M p o i l n m a m r d f 0 dJournal of Hazardous Materials 171 (2009) 767–773 Contents lists available at ScienceDirect Journal of Hazardous Materials journa l homepage: www.e lsev ier .com/ locate / jhazmat tudies on adsorption of crystal violet dye from aqueous solution nto coniferous pinus bark powder (CPBP) ais Ahmad ? nvironmental Research Laboratory, Department of Applied Chemistry, Faculty of Engineering and Technology, Aligarh Muslim University, Aligarh 202002, UP, India r t i c l e i n f o rticle history: eceived 28 January 2009 eceived in revised form 12 June 2009 ccepted 15 June 2009 a b s t r a c t The present study shows that the coniferous pinus bark powder (CPBP) can be used as a potential adsor- bent for the removal of crystal violet (basic dye) from aqueous solutions. Experiments were carried out as a function of contact time, concentration, temperature, pH and dosage. The amount of dye uptake was found to vary with increasing initial solution pH and maximum adsorption was observed at pH 8. Thevailable online 21 June 2009 eywords: dsorption isotherms oniferous pinus bark powder rystal violet equilibrium was attained in 2 h. The amount of dye uptake (mg/g) was found to increase with increase in dye concentration and contact time. The % adsorption was found to decrease with increase in amount of adsorbent. The thermodynamic parameters were also calculated and the positive value of H? indicates the endothermic nature of adsorption. The applicability of the three isotherm’s model for the present data follows the order: Langmuir Temkin Freundlich. The kinetics of crystal violet on to the adsorbent pseudhermodynamics esorption can be described well by . Introduction The industrial wastewater usually contains a variety of organic ompound and toxic substances which are harmful to fish and other quatic life. Many industries such as dyestuffs, textile, paper and lastics, use dyes in order to color their p