Simultaneously removal of inorganic arsenic species from stored rainwater in arsenic endemic area by leaves of Tecomella undulata: a multivariate study

• Published in: Environmental science and pollution research international 2016-08, Vol.23 (15), p.15149-15163
• Main Authors: Brahman, Kapil Dev, Kazi, Tasneem Gul, Afridi, Hassan Imran, Baig, Jameel Ahmed, Abro, Muhammad Ishaque, Arain, Sadaf Sadia, Ali, Jamshed, Khan, Sumaira
• Format: Article
• Language: English
• Subjects: Activated carbon; Adsorbents; Adsorption; Aquatic Pollution; Arsenic; Arsenic - isolation & purification; Atmospheric Protection/Air Quality Control/Air Pollution; Bignoniaceae - chemistry; Biosorption; Drinking water; Earth and Environmental Science; Ecotoxicology; Endemic species; Environment; Environmental Chemistry; Environmental Health; Experimental design; Groundwater; Groundwater availability; Hydrogen-Ion Concentration; Kinetics; Optimization; Oxidation; Pakistan; Plant Leaves - chemistry; Poisoning; Research Article; Solid Phase Extraction; Spectroscopy, Fourier Transform Infrared; Tecomella undulata; Thermodynamics; Toxicity; Waste Water Technology; Water - chemistry; Water analysis; Water Management; Water Pollutants, Chemical - isolation & purification; Water Pollution Control; Water Purification - methods; Water sampling
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-016-6519-2

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