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Dwivedi, S. B.
- Adsorption of Arsenic using Low Cost Adsorbents:Guava Leaf Biomass, Mango Bark and Bagasse
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Authors
Affiliations
1 Department of Civil Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, IN
2 Department of Civil Engineering, Institute of Engineering and Technology, Lucknow 226 021, IN
1 Department of Civil Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, IN
2 Department of Civil Engineering, Institute of Engineering and Technology, Lucknow 226 021, IN
Source
Current Science, Vol 117, No 4 (2019), Pagination: 649-661Abstract
Adsorbents prepared from inexpensive materials of guava leaf biomass, mango bark and bagasse were studied for As(III) removal from the aqueous solution. The effects of pH, contact time, initial As(III) concentration and adsorbent dosage on the adsorption of As(III) were studied using batch experiments. Adsorption process was also verified with Langmuir, Freundlich, Temkin and Redlich–Peterson models. Langmuir isotherm fitted best in the experimental data. Application of Langmuir isotherm to the system yielded the maximum capacities of 1.35 mg g–1, 1.25 mg g–1 and 1.05 mg g–1 for bagasse, mango bark and guava leaf biomass respectively, in the range of As(III) concentration as 10–140 mg l–1. The dimensionless equilibrium parameter, RL, signifies favourable adsorption of As(III) on all adsorbents and was observed to be in the range of 0.029–0.294, 0.021– 0.235 and 0.021–0.234, for bagasse, mango bark and guava leaf biomass respectively (0 < RL < 1). The adsorption process was observed to follow pseudosecond- order kinetic model.Keywords
Adsorption, Arsenite Ion-As(III), Isotherms, Kinetics, Low-Cost Adsorbents.Full Text
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- Metamorphic evolution of mafic granulites from Tiyara area, Makrohar granulite belt, Singrauli district, Madhya Pradesh, India
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Authors
Affiliations
1 Department of Civil Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, India, IN
1 Department of Civil Engineering, Indian Institute of Technology (BHU), Varanasi 221 005, India, IN
Source
Current Science, Vol 123, No 11 (2022), Pagination: 1334-1340Abstract
The mafic granulite rocks from the Makrohar Granulite Belt of the Chotanagpur Granite Gneissic complex (CGGC) have been studied with reference to their petrography, mineral chemistry and pressure–temperature (P–T) conditions of metamorphism. The common mineral assemblage observed within different thin sections is orthopyroxene–clinopyroxene–hornblende–plagioclase–biotite–quartz. The average P–T condition of the mafic granulites in the study area suggests a peak of metamorphism at 799° ± 40°C/6.3 ± 0.9 kbar. However, the peak P–T estimate obtained from the conventional two-pyroxene thermobarometer is 5.83–6.47 kbar and 887° ± 62°C at a fixed pressure of 6 kbar, followed by post-peak P–T conditions of metamorphism at 590°–693°C/2.1–2.4 kbarKeywords
Mafic granulites, metamorphic rocks, mineral assemblage, pressure, temperature.Full Text
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