Detection prediction and mapping of Chromium through QGIS and adsorption of hexavalent Chromium by modified bio-adsorbents: kinetic and adsorption study

Abstract

Toxicity due to the presence of heavy metals in ground and surface water due to the release of effluents from industries holds the potency to cause temporary or permanent damage to the living organisms in the near vicinity of these industries. This paper aims to assess the vulnerability of groundwater resources owing to its contamination in Banthar Industrial Area. Using DRASTIC model in combination with Quantum Geographic Information System (QGIS), a groundwater vulnerability map was developed, which indicated that the dispersal of Chromium was in the range of 300 -1000 μg/l. In order to study the impact of Chromium dispersion, the authors proposed a batch adsorption testing of the Hexavalent Chromium (Cr (VI)) using different bio-adsorbent materials, keeping a pH range of 3 -9 and the contact time between 0-80 minutes. Adsorption isotherms and Kinetic studies were also considered. All adsorbents followed the Langmuir isotherm (R 2 > 0.986), whereas Temkin isotherm stated the affinity of the adsorbents for the Cr (VI). The reactions between Chromium and the bio-adsorbents were found to follow pseudo-second order kinetics, which indicated that the reactions were exothermic. The results proposed that a modification in the bio-adsorbents caused an enhancement in the percent adsorption of Cr (VI) in comparison to the natural available bio-adsorbents.

Mapping Geotechnical Soil Properties of Ranya City in Kurdistan Region of Iraq Using GIS

“…This population rise increases the need for building more residential areas and engineering projects, for which site investigation of the soil is essential which is a difficult task that requires substantial effort, time and cost.Using technology can save time and cost of the investigations if used correctly. With the developments in computation in the last two decades, GIS is often used to capture, store, manage, query, analyze, display and retrieve huge volumes of referenced geospatial data and associated attribute data collected from variety of sources (Manguri and Hamza, 2021;Mirzahossein et al, 2020;Tripathi et al, 2021). GIS provides data with actual geographical location.…”

“…Using technology can save time and cost of the investigations if used correctly. With the developments in computation in the last two decades, GIS is often used to capture, store, manage, query, analyze, display and retrieve huge volumes of referenced geospatial data and associated attribute data collected from variety of sources (Manguri and Hamza, 2021;Mirzahossein et al, 2020;Tripathi et al, 2021). GIS provides data with actual geographical location.…”