Abstract
The pine cone and oak cups pulp were used as low-cost adsorbents for the removal of basic (Basic Red 18) and acidic (Acid Red 111) dyes and Cr (VI) from aqueous solutions. The adsorbents were modified by HNO3to improve their biosorption capacity. The adsorbents were characterized using scanning electron microscopy and FTIR spectroscopy. The zeta potential was determined as a function of the pH, in order to explain the effect of pH on electrostatic adsorption ability of biosorbent. Modification of adsorbents with nitric acid led to an increase in accessibility of some functional groups on the surface or a decrease in negativity of surface charge. The modification of pine cone increased its adsorption capacity for the basic dye, whereas the modification of oak cups pulp decreased the adsorption ability for basic dye to some extent. The adsorption isotherms fitted the Langmuir model. The adsorption capacities were found to be 142.85, 158.73, and 156.20 mg g-1 for modified and raw pine cone and oak cups pulp, respectively. The acidic dye and Cr (VI) adsorptions were much lower compared to basic dye on all tested adsorbents. The results indicated that the forest wastes (pine cone and oak cups pulp) were an attractive candidate for basic dyes from aqueous solution.
Highlights
E biosorption of organic and inorganic toxic contaminants from waste water has greatly increased because an inexpensive and more available adsorbent would make the removal of pollutants an economically viable alternative [1, 2]
A number of lignocellulosic wastes have been tried for dye and metal removal. ese include wood sawdust [3, 4], orange peel [5, 6], tobacco dust [7], tea waste [8], hen feathers [9], sun ower seed hull [10], palm kernel bre [11], coir pith [12], peanut hull [13], grape stalks [14], soya cake [15], soy meal hull [16], sugar beet pulp [17], and Canola hull [18]
The biosorbent having high cationic sorption capacity was obtained by thermochemically modi cation of biomass with citric acid [23]
Summary
E biosorption of organic and inorganic toxic contaminants from waste water has greatly increased because an inexpensive and more available adsorbent would make the removal of pollutants an economically viable alternative [1, 2]. A number of studies exist on the modi cation of the agricultural wastes to increase their adsorption capacity. The biosorbent having high cationic sorption capacity was obtained by thermochemically modi cation of biomass with citric acid [23]. Forestry wastes (pine cone and oak cups pulp) were used for dyes and Cr (VI) removal and acid pretreatment of biomass was adopted to improve their removal, efficiency. E aim of this study is to investigate the potential of cone of stone pine (Pinus pinea L) and oak cups pulp waste acorn as alternative low-cost adsorbent for basic and acidic dyes and Cr (VI) metal ion. Biosorption using various lowcost biomass materials has been widely studied, there has not been any report on oak cups pulp and pine cone
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