3 research outputs found
Adsorption of an emerging contaminant (primidone) onto activated carbon: kinetic, equilibrium, thermodynamic, and optimization studies
The current study addresses the removal of an
emerging environmental contaminant (primidone) in
batch adsorption experiments using commercial-grade
powdered activated charcoal (PAC). The experiments
for the removal of primidone were performed to identify
the effect of various adsorption parameters. The secondorder
rate expression best represented the adsorption
kinetics data. The Freundlich isotherm equation was
best fitted to the experimental adsorption data at equilibriumfor
removal of primidone using PAC. The values
for change in entropy (ΔSo) were positive, which indicates
that the degree of freedomof the process increases.
The negative values of change in enthalpy (ΔHo) and
change in Gibb’s free energy (ΔGo) indicate that the
physical adsorption is a dominant phenomenon, and the
process is feasible and spontaneous. The negative value
of ΔHo also represented the exothermicity of the adsorption
process. The Taguchi optimization technique
calculated the influence of variation of different process
parameters, viz., initial pH (pH0), PAC dosage (m),
initial adsorbate concentration (C0), solution temperature
(T), and process contact time (t), on the removal of
primidone by adsorption from aqueous solution. Each of
the above parameters was examined at three levels to
study their effects on the adsorptive uptake of primidone
using PAC (qe, mg g−1), and the optimum value necessary
to maximize qe was determined. The findings from
the ANOVA indicate that the PAC dose (m) is the most
notable parameter contributing 62.16% to qe and a
71.96% to the signal to noise (S/N) ratio data, respectively.
The confirmation experiments performed at the
optimum parameter condition validated the applicability
of the Taguchi design of experiments. The percent removal
and adsorptive uptake at the optimal condition
were 86.11% and 0.258 mg g−1, respectively
Simultaneous quantitative monitoring of four indicator contaminants of emerging concern (CEC) in different water sources of Central India using SPE/LC-(ESI)MS-MS
Environmental occurrence of CECs poses a
great threat to both aquatic life and human health. The
aim of this study was to optimize and validate SPE/
LC-(ESI)MS-MS method for simultaneous quantitative
monitoring of two sub-classes of CECs (pharmaceuticals
and hormones) and to estimate the concentrations of
select CECs in environmental water samples. For all the
tested analytes, recoveries in laboratory reagent water
were greater than 81%. Average percent (relative standard
deviation) RSD of the analytes in recovery, repeatability,
and reproducibility experiments were ≤ 10%.
Determination coefficients (r2) of primidone,
diclofenac, testosterone, and progesterone were estimated
to be 0.9979, 0.9972, 0.9968, and 0.9962, respectively.
Limits of detection (LOD) for primidone,
diclofenac, testosterone, and progesterone were
4.63 ng/L, 5.36 ng/L, 0.55 ng/L, and 0.88 ng/L, respectively.
Limits of quantification (LOQ) for primidone,
diclofenac, testosterone, and progesterone were
14.72 ng/L, 17.06 ng/L, 1.766 ng/L, and 2.813 ng/L,
respectively. Average recoveries in environmental water
and wastewater samples were greater than 74% and
RSD were ≤ 7%. Trace levels (68.33–125.70 ng/L) of
primidone were detected in four environmental water
samples, whereas diclofenac was not detected in any of
the tested sample. Trace levels of progesterone were
observed in two environmental samples (16.64 –
203.73 ng/L), whereas testosterone was detected in
STP inlet sample (178.16 ng/L)
Abstracts of National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020
This book presents the abstracts of the papers presented to the Online National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020 (RDMPMC-2020) held on 26th and 27th August 2020 organized by the Department of Metallurgical and Materials Science in Association with the Department of Production and Industrial Engineering, National Institute of Technology Jamshedpur, Jharkhand, India.
Conference Title: National Conference on Research and Developments in Material Processing, Modelling and Characterization 2020Conference Acronym: RDMPMC-2020Conference Date: 26–27 August 2020Conference Location: Online (Virtual Mode)Conference Organizer: Department of Metallurgical and Materials Engineering, National Institute of Technology JamshedpurCo-organizer: Department of Production and Industrial Engineering, National Institute of Technology Jamshedpur, Jharkhand, IndiaConference Sponsor: TEQIP-