Using of activated carbon produced from spent tea leaves for the removal of malachite green from aqueous solution

Adsorptive Removal of Malachite Green from Model Aqueous Solutions by Chemically Modified Waste Green Tea Biomass

“…The band at 2916 cm -1 is attributed to the C-H stretching vibration of aliphatic acids, while the band at 1635 cm -1 is due to asymmetric stretching vibrations of C=O, from carboxyl acid groups. 17,31 The other prominent band at 1028 cm -1 was shifted at 1036 cm -1 and is due to C-O stretching vibration from cellulose. Moreover, in the case of treated WGT biomass after adsorption, a remarkable shift in positions of -OH and C=O bands was observed, which indicates that MG is binded mostly at these groups.…”

“…19 Previous studies have centered their attention on the preparation of waste tea activated carbon 17,20 or on various treatments involving acetylation, isopropyl alcohol, formaldehyde, HNO 3 , pressure, and ultrasound. 17,[20][21][22][23][24] The aim of this study was to realize malachite green (MG) adsorption onto chemically modified waste green tea (WGT). Influence of the adsorbent quantity and temperature over the MG removal were also considered in order to investigate the WGT potential as a biosorbent.…”

“…16 Taking into consideration the quantity of tea and tea based drinks consumed annualy, which gives rise to a disposal problem, utilization of such waste is extremely desirable. [17][18] The cell wall of tea consist of cellulose and hemicelluloses, lignin, condensed tannins, and structural proteins. In short, tea waste have a good potential as dyes scavengers from aquesous solution since its constituents contain several functional groups.…”

Biosorption of cationic dye from aqueous solutions onto lignocellulosic biomass (Luffa cylindrica): characterization, equilibrium, kinetic and thermodynamic studies

“…The first sharp stage represents the transfer of MB from the solution to the outer surface of the biosorbent; the second gradual stage can be attributed to the penetration of MB into the interlayer of the biosorbent where the intra-particle diffusion is rate limiting. The third stage corresponds to the equilibrium phase and the weak biosorption is ascribed to the residual low MB concentration [70]. The intra-particle diffusion rate constants (k int ) are gathered in Table 4.…”

“…The relation gives information about the thickness of the boundary layer and the plot of q t versus t should yield a straight line passing by the origin if the biosorption process obeys to the intraparticle diffusion model [46,70].…”