Evaluation of new chemically modified coconut shell adsorbents with tannic acid for Cu (II) removal from wastewater

Abstract

The adsorption of Cu (II) from aqueous solutions using coconut shell modified powder was investigated in batch experiments. The surface charge of the adsorbent was determined. The points of zero charge (PZC) of the adsorbents (pHPZC) were 4.5, 2.0, and 2.0 to raw coconut (RC), raw coconut alkalized (RCA), and coconut shell modified with tannic acid (TCA) adsorbent, respectively. Batch experiments were performed under kinetic and equilibrium conditions. The kinetic data were analyzed using a pseudo second‐order, and Elovich equation. Adsorption equilibrium data were investigated using the Langmiur, Freundlich, Temkin, and Dubinin–Raduschevich (D–R) isotherm models. It has been found that chemically modified coconut shell (TAC) affected performance when compared with unmodified coconut shell (RC). Kinetic studies showed that the adsorption followed a pseudo‐second‐order rate model. Biosorption kinetics of Cu(II) on the adsorbent TCA was rapid such that almost 90% of Cu(II) were adsorbed within 80 min. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40744.

Multielement adsorption of metal ions using Tururi fibers (Manicaria Saccifera): experiments, mathematical modeling and numerical simulation

“…Sousa Neto and coworkers [15] studied the removal of the same metal ions studied in the present work using green coconut shell as adsorbent and the authors also found a fast kinetic process with 90% of metal ions adsorbed within 80 min. According to them, the mechanisms responsible to the metal uptake by vegetal biomaterials involve ion exchange, surface adsorption, chemisorption, complexation, and adsorption-complexation processes.…”

“…The presence of polar functional groups including carboxylic, hydroxil, and phenolic acid groups [14,15] in Tururi fibers can be involved in metal binding by ion exchange between protons present in the biomass and metal ions taken up from water or complexation mechanism interaction. Sousa Neto and coworkers [15] studied the removal of the same metal ions studied in the present work using green coconut shell as adsorbent and the authors also found a fast kinetic process with 90% of metal ions adsorbed within 80 min.…”

Removal of Ni2+, Cu2+, Zn2+, Cd2+and Pb2+ions from aqueous solutions using cashew peduncle bagasse as an eco-friendly biosorbent

“…(2015) [1][2][3][4][5][6][7][8][9][10][11][12][13][14] www.deswater.com doi: 10.1080/19443994.2015.1037355 Adsorption, particularly, is one of the most promising techniques used to remove metal ions from water. Among the adsorbents used for water decontamination, lignocellulose-derived materials are often selected, due to their low cost and simplicity, unlike activated carbon.…”

“…Among the adsorbents used for water decontamination, lignocellulose-derived materials are often selected, due to their low cost and simplicity, unlike activated carbon. Moreover, there is a growing worldwide interest in the use of natural fibres [5][6][7] as adsorbents, including banana [8,9], coconut green bagasse [10][11][12][13], sugar cane bagasse [14][15][16] and cashew peduncle bagasse (CPB) [17,18].…”

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“…La cáscara o endocarpio de coco es un material de biomasa lignocelulósica, que contiene sustancias biodegradables y no tóxicas, como el glucano, el xilano, la klason-lignina y las cenizas . Además, la cáscara de coco es muy hidrófila, propiedad que le confiere su grupos funcionales o químicos como el acetamido, el amino, la amida, el sulfhidrilo, el sulfato, el carboxilo y el hidroxilo (Sousa et al 2014). Según Pérez (2019) la producción de coco a nivel mundial para el año 2018 fue de 56211700 toneladas, siendo los principales productores Indonesia, Filipinas e India y en América el país con la mayor producción Brasil.…”