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

• Published in: Journal of applied polymer science Vol. 131; no. 18; pp. 9087 - n/a
• Main Authors: de Oliveira Sousa Neto, Vicente, Melo, Diego Quadros, de Oliveira, Talles Cardoso, Nonato, Raimundo, Teixeira, P., Silva, Marcos Antônio Araújo, Nascimento, Ronaldo Ferreira do
• Format: Journal Article
• Language: English
• Published: Hoboken, NJ Blackwell Publishing Ltd 15-09-2014; Wiley; Wiley Subscription Services, Inc
• Subjects: Adsorbents; Adsorption; Agronomy. Soil science and plant productions; Applied sciences; Aqueous solutions; Biological and medical sciences; Cellulose and derivatives; cellulose and other wood products; Copper; Equilibrium conditions; Exact sciences and technology; fibers; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Glass transition temperature; kinetics; Materials science; Natural polymers; Papal visits; Physicochemistry of polymers; Pollution; Polymers; Raw; Shells; Surface charge; Surface chemistry; Tannic acid; theory and modeling; Use of agricultural and forest wastes. Biomass use, bioconversion; Wastewater treatment; Wastewaters; Water treatment and pollution; Tannic acid; Copper II; Surface reaction; adsorption; fibers; Liquid solid adsorption; Adsorption isotherm; Coconut; Metal ion; Lignocellulosics; Experimental study; Modeling; Organic adsorbent; theory and modeling; Kinetic model; Pollutant; Chemical modification; Polyphenol; cellulose and other wood products; Agricultural waste; Husk (fruit); Waste water purification; kinetics
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.40744

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 (pH
PZC
) 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.