Eco-structured biosorptive removal of basic fuchsin using pistachio nutshells: A definitive screening design-based approach
Author | El-Azazy M. |
Author | El-Shafie A.S. |
Author | Ashraf A. |
Author | Issa A.A. |
Available date | 2020-04-01T09:45:57Z |
Publication Date | 2019 |
Publication Name | Applied Sciences (Switzerland) |
Resource | Scopus |
ISSN | 20763417 |
Abstract | Biosorptive removal of basic fuchsin (BF) from wastewater samples was achieved using the recycled agro-wastes of pistachio nut shells (PNS). Seven adsorbents were developed; raw shells (RPNS) and the thermally activated biomasses at six different temperatures (250–500 °C). Two measures were implemented to assess the performance of utilized adsorbents; %removal (%R) and adsorption capacity (qe). RPNS proved to be the best among the tested adsorbents. A smart approach, definitive-screening design (DSD) was operated to test the impact of independent variables on the adsorption capacity of RPNS. pH, adsorbent dose (AD), dye concentration (DC), and stirring time (ST), were the tested variables. Analysis of variance (ANOVA), control, and quality charts helped establishing regression model. Characterization was performed using Fourier- transform infrared (FT-IR)/Raman spectroscopies together with thermogravimetric analysis (TGA) and scanning electron microscopy (SEM)/energy-dispersive X-ray spectroscopy (EDX) analyses. The surface area and other textural properties were determined using the Brunauer Emmett-Teller (BET) analysis. Removal of 99.71% of BF with an adsorption capacity of 118.2 mg/g could be achieved using a factorial blend of pH 12, 100 mg/50 mL of RPNS, and 250 ppm BF for 20 min. Equilibrium studies reveal that the adsorption is physisorption with adsorption energy of 7.45 kJ/mol as indicated by Dubinin-Radushkevich (DR) and Langmuir isotherms. Moreover, adsorption follows pseudo-second-order kinetics with respect to BF and is controlled by the adsorption rate. |
Sponsor | This work was made possible by Qatar University Internal Student Grant [QUST-2-CAS-2019-18] from Qatar University. The statements made herein are solely the responsibility of the authors. The publication of this article was funded by the Qatar National Library. |
Language | en |
Publisher | MDPI AG |
Subject | Adsorption capacity (qe) Basic fuchsin (BF) Characterization Definitive-screening design (DSD) Equilibrium Kinetics Pistachio nutshells (PNS) |
Type | Article |
Issue Number | 22 |
Volume Number | 9 |
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Chemistry & Earth Sciences [582 items ]