Showing papers by "Vinod Kumar Gupta published in 2000"
TL;DR: In this paper, the effect of pH, adsorbent dose, dye concentration, and presence of surfactant on the removal of rhodamine B and methylene blue was investigated.
Abstract: Bagasse fly ash, a waste generated in sugar industries in India, has been converted into an inexpensive adsorbent material and utilized for the removal of two basic dyes, rhodamine B and methylene blue. Results include the effect of pH, adsorbent dose, dye concentration, and presence of surfactant on the removal of rhodamine B and methylene blue. The adsorption data have been correlated with both Langmuir and Freundlich adsorption models. Thermodynamic parameters obtained indicate the feasibility of the process, and kinetic studies provided the necessary mechanistic information of the removal process.
305 citations
TL;DR: In this article, Bagasse fly ash, a waste produced in sugar industries, has been converted into an inexpensive and effective adsorbent, which has been used for the removal of copper and zinc from wastewater.
297 citations
TL;DR: In this paper, Me4Bzo2TAA, NaTPB and PVC in the optimum ratio 2:1:97 (w/w) gave the best working concentration range (7.9×10−6−1.6) with a Nernstian slope (30.0+−1).
263 citations
TL;DR: In this paper, the mass transfer kinetic approach has been successfully used for the determination of various parameters necessary for designing a fixed bed adsorber, including the total time (t x ) involved for the establishment of the primary adsorption zone (PAZ), the time ( t δ ) required for the movement of PAZ down its length, the fractional capacity ( f ), the length of ( PAZ) primary adoration zone ( δ ), and percentage saturation of column at break point have been evaluated for carbon columns for the removal of phenols viz., 2,
183 citations
TL;DR: In this article, a Cadmium(II) ion selective sensor has been fabricated from polyvinyl chloride (PVC) matrix membranes containing neutral carrier, monoaza-18-crown-6, sodium tetraphenyl borate (NaTPB) as an anion excluder and dibutylphthalate (DBP) and dioctylphthalates (DOP) as plasticizing solvent mediators.
Abstract: Cadmium(II) ion selective sensors have been fabricated from poly(vinyl chloride) (PVC) matrix membranes containing neutral carrier, monoaza-18-crown-6, sodium tetraphenyl borate (NaTPB) as an anion excluder and dibutylphthalate (DBP) and dioctylphthalate (DOP) as plasticizing solvent mediators. The membrane having the composition crown:NaTPB:PVC:DOP in the ratio 1:1:10:10 exhibits best results with linear potential response in the concentration range 1.0×10–5–1.0×10–1 M with a detection limit of 1.12 mg/L and a Nernstian slope of 29.0 mV/decade between pH 5.0–7.7. The sensor exhibits a fast response time of<10 s, is inert towards acids, salt solutions and nonaqueous media (upto 35% (v/v)) and was used over a period of 3 months with good reproducibility. It is selective over a number of mono-, bi-, and trivalent cations. The practical utility of the sensor has been demonstrated by using it as an indicator electrode in the potentiometric titration of Cd2+ with EDTA and also for the determination of Cd2+ in waste water.
31 citations