TY - JOUR
T1 - Arabica-coffee and teobroma-cocoa agro-industrial waste biosorbents, for Pb(II) removal in aqueous solutions
AU - Lavado-Meza, Carmencita
AU - De la Cruz-Cerrón, Leonel
AU - Cisneros-Santos, Gregorio
AU - De la Cruz, Alex H.
AU - Angeles-Suazo, Julio
AU - Dávalos-Prado, Juan Z.
N1 - Funding Information:
Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. The research leading to these results received funding from Universidad Nacional Intercultural de la Selva Central Juan Santos Atahualpa under Grant Agreement No 207-2020-UNISCJSA
Publisher Copyright:
© 2022, The Author(s).
PY - 2023/1
Y1 - 2023/1
N2 - Agro-industrial waste biosorbents of arabica–coffee (WCA) and theobroma–cocoa (WCT) have been characterized and tested to remove Pb(II) from aqueous media. The maximum adsorption capacity of WCA and WCT (qmax = 158.7 and 123.5 mg·g−1, respectively) is comparable or even higher than for several other similar agro-industrial waste biosorbents reported in the literature. Structural and morphological characterization were performed by infrared spectrometry with Fourier transform (FT-IR), scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), and charge measurements at the zero point charge (pHPZC). Both biosorbents, WCA and WCT, show cracked surfaces with heterogeneous plates which ones include functional adsorption groups such as OH, C = O and C-O-C. Optimal Pb(II) adsorption occurs for a pH between 4 and 5 at [WCA] and [WCT] dose concentrations of 2 g·L−1. We found that the adsorption process follows pseudo-second order kinetics with a rapid growth rate (almost six times larger for WCA than for WCT), basically controlled by the chemisorption process. The regeneration of both biosorbents was carried out in an eluent of 0.1M HNO3 and they can be efficiently reused up to 5 times.
AB - Agro-industrial waste biosorbents of arabica–coffee (WCA) and theobroma–cocoa (WCT) have been characterized and tested to remove Pb(II) from aqueous media. The maximum adsorption capacity of WCA and WCT (qmax = 158.7 and 123.5 mg·g−1, respectively) is comparable or even higher than for several other similar agro-industrial waste biosorbents reported in the literature. Structural and morphological characterization were performed by infrared spectrometry with Fourier transform (FT-IR), scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), and charge measurements at the zero point charge (pHPZC). Both biosorbents, WCA and WCT, show cracked surfaces with heterogeneous plates which ones include functional adsorption groups such as OH, C = O and C-O-C. Optimal Pb(II) adsorption occurs for a pH between 4 and 5 at [WCA] and [WCT] dose concentrations of 2 g·L−1. We found that the adsorption process follows pseudo-second order kinetics with a rapid growth rate (almost six times larger for WCA than for WCT), basically controlled by the chemisorption process. The regeneration of both biosorbents was carried out in an eluent of 0.1M HNO3 and they can be efficiently reused up to 5 times.
KW - Agricultural waste
KW - Biosorption
KW - Cocoa residues
KW - Coffee residues
KW - Heavy metals
KW - Langmuir isotherms
KW - Pb(II) removal
UR - http://www.scopus.com/inward/record.url?scp=85135586175&partnerID=8YFLogxK
U2 - 10.1007/s11356-022-22233-3
DO - 10.1007/s11356-022-22233-3
M3 - Original Article
C2 - 35934741
AN - SCOPUS:85135586175
SN - 0944-1344
VL - 30
SP - 2991
EP - 3001
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
IS - 2
ER -