Biosorption of Cadmium on Spent Tea: Green Chemistry Approach

Aliya Fazal and Uzaira Rafique



Pollution load of cadmium into the receiving waters is a threat to water resources, thus limiting the clean energy production. During recent years biosorption has gained imperative credibility because of its good performance and low cost. The present research offers an effective green chemistry approach to waste management. Tea waste, a fibrous by-product during tea processing, has been used as an adsorbent of heavy metals, however, utilization of the spent tea needs to be explored. The optimum operating conditions are found to be 20 minutes contact time, adsorbent dose of 0.05 g, and induced metal ion concentration of 50 mg/L. Biosorbent has been specifically modified by oxidation, acetylation and isopropyl alcohol to understand the mechanism of cadmium adsorption from synthetic solution. The origin of the enhancement is investigated by observing the sorption behavior and the change in surface functional group concentrations by FTIR and active sites by Boehm method. The present study recommends spent tea as a cost effective and easily available substitute for conventional carbon based adsorbents for metal removal.


Keywords: Spent tea; sorption; modification; metals