A bowl-shaped biosorbent derived from sugarcane bagasse lignin for cadmium ion adsorption

Abstract

Lignocellulosic materials have received wide interest in adsorption of contaminants in water due to their abundance, eco-friendliness, and low cost. However, the development of new adsorbents from lignocellulose with excellent performance is still a big challenge. In this work, a new bowl-shaped biosorbent (BSB) with surface functionality is prepared from lignin that is extracted from the abundant sugarcane bagasse. The product is characterized by scanning electron microscopy, infrared spectrum, thermo gravimetric analysis and N 2 adsorption techniques. The results show that the obtained BSB is obviously bowlshaped in microscale with an enlarged surface area, and contains numerous oxygen and nitrogen functional groups. It exhibits an enhanced adsorption capacity toward Cd 2? that is 3.2 times of the original lignin. The adsorption process of Cd 2? by the BSB is well fitted by the Freundlich isothermal model and the pseudo-second-order kinetic model, respectively. The adsorption mechanism involves surface complexation, ion-exchange, electrostatic attraction, chemical precipitation and physical adsorption, etc., among them, the surface complexation is the rate-controlling step. Moreover, it shows a good reusability during five repeated cycling for Cd 2? adsorption.

Modified Polymeric Biosorbents from Rumex acetosella for the Removal of Heavy Metals in Wastewater

“…On the other hand, of particular interest were the fiber contents, which presented a significant difference ( p < 0.05), which in the case of the dry stem had a higher value (62.28%). That is why it was decided to obtain the biosorbents from this fraction of the plant, rich in cellulose, hemicellulose, and lignin, which are essential in the adsorption of heavy metals [ 34 , 35 , 36 , 37 , 38 ].…”

Removal of Heavy Metals from Aqueous Solutions with the Use of Lignins and Biomass

“…The latest research shows that lignin can also be modified by giving its particles a special geometry (bowl shape). Recently, bowl-shaped and concave sorbent particles have attracted a lot of attention due to their good mass transport properties, rheological properties, and large adsorption surface [112]. Scientists from Finland and China synthesised multifunctional hybrid magnetic nanoparticles based on lignin with an ultrafast Pb 2+ and Cu 2+ adsorption capacity.…”