Simultaneously removal of inorganic arsenic species from stored rainwater in arsenic endemic area by leaves of Tecomella undulata: a multivariate study.
In the present study, an indigenous biosorbent (leaves of Tecomella undulata) was used for the simultaneous removal of inorganic arsenic species (As(III) and As(V)) from the stored rainwater in Tharparkar, Pakistan. The Plackett-Burman experimental design was used as a multivariate strategy for the evaluation of the effects of six factors/variables on the biosorption of inorganic arsenic species, simultaneously. Central composite design (CCD) was used to found the optimum values of significant factors for the removal of As(III) and As(V). Initial concentrations of both inorganic As species, pH, biosorbent dose, and contact time were selected as independent factors in CCD, while the adsorption capacity (q e) was considered as a response function. The separation of inorganic As species in water samples before and after biosorption was carried out by cloud point and solid-phase extraction methods. Theoretical values of pH, concentration of analytes, biosorbent dose, and contact time were calculated by quadratic equation for 100 % biosorption of both inorganic As species in aqueous media. Experimental data were modeled by Langmuir and Freundlich isotherms. Thermodynamic and kinetic study indicated that the biosorption of As(III) and As(V) was followed by pseudo second order. It was concluded that the indigenous biosorbent material efficiently and simultaneously removed both As species in the range of 70.8 to 98.5 % of total contents in studied ground water samples. Graphical abstract Optimizing the significant varable by central 2(3) + star orthogonal composite design.
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan. kr_brahman@yahoo.com.
Kapil Dev
KD
Brahman
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan.
Tasneem Gul
TG
Kazi
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan.
Hassan Imran
HI
Afridi
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan.
Jameel Ahmed
JA
Baig
Department of Metallurgy and Materials Engineering, Mehran University of Engineering and Technology, Jamshoro, 76080, Pakistan.
Muhammad Ishaque
MI
Abro
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan.
Sadaf Sadia
SS
Arain
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan.
Jamshed
J
Ali
National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro, 76080, Pakistan.
Sumaira
S
Khan
D000327:Adsorption; D001151:Arsenic / Q000302:isolation & purification*; D029402:Bignoniaceae / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010154:Pakistan; D018515:Plant Leaves / Q000737:chemistry*; D052616:Solid Phase Extraction; D017550:Spectroscopy, Fourier Transform Infrared; D013816:Thermodynamics; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D014874:Water Pollutants, Chemical; D014867:Water; D001151:Arsenic
Biosorbent; Inorganic arsenic species; Multivariate technique; Rainwater; Tecomella undulata