Competitive effects for the adsorption of copper, cadmium and lead ions using modified activated carbon from bambo

Jherwin Ocreto,Chester Ian Go,Jans Cholo Chua,Cyrrus Jude Apacible,Anabella Vilando,A Orbecido,A Beltran,V Bungay,K Aviso

doi:10.1051/matecconf/201926806021

Abstract

Modified activated carbon from bamboo was used as a low-cost potential adsorbent to remove cadmium, copper and lead in single, bimetal and trimetal aqueous solutions. Using the initial concentration of 40 ppm, the analysis was conducted to determine the effect of pH (2.5, 3.0, and 5.5), contact time (60, 90, 120 min) and adsorbent dosage (20, 40, 60 mg/50 mL of solution). Results showed that for single metal aqueous solution, the % adsorption for Cu, Cd, and Pb were 89.0%, 87.4%, and 99.5% respectively. For bimetal aqueous solution the % adsorption of CuCd, CuPb, CdCu, CdPb, PbCu,and PbCd were 90.6%, 98.9%, 55.1%, 80.7%, 99.6%, and 96.05%, respectively. While for trimetal aqueous solutions, % adsorption of Cu, Cd, and Pb were 87.4%, 73.0%, and 98.4%, respectively. The % removal uptake followed the order Pb > Cu> Cd gave insights into competition effects among the three solutes during the adsorption process. Using Box–Behnken Design, the effect pH of the aqueous solution is an important controlling parameter in which the % adsorption increased as the pH level is increased while other parameters were insignificant.

Highlights

Water pollution by heavy metals discharged from industrial effluents has become a worldwide problem during recent years, as most heavy metal species have toxic effects on organisms and accumulate in biota which does not undergo biological decay they are much harder to remove [1].The long-term use of wastewater in agricultural land results in the contamination of soils by toxic heavy metals
While for trimetallic aqueous solution, the % adsorption of Cu, Cd, and Pb was 87.4%, 73.0%, and 98.4% respectively. The results of these experiments showed that the order of Pb > Cu> Cd gave an insight in the competition effects among the three solutes during the adsorption process
Using Box-Behnken Design (BBD), the % adsorption increased as the pH values increased from 2.5 to 5.5

Summary

Introduction

The long-term use of wastewater in agricultural land results in the contamination of soils by toxic heavy metals. These heavy metals include: zinc (Zn), cadmium (Cd), copper (Cu), nickel (Ni), lead (Pb), manganese (Mn), iron (Fe), mercury (Hg), and chromium (Cr) [2,3]. Various toxic heavy metals affect the production and quality of crops and potentially influence the quality of water bodies. It threatens the life of terrestrial, aquatic animals and health of humans by food chain cycle [4,5]. The most severe is the kind of pollution it can produce in a long-term and non-reversible

Methods

Results

Conclusion