4 research outputs found
Variation in the chemical constituents of soybean due to industrial pollution
The two varieties of soybean (Soybean Bragg and Soybean JS-71-05) were collected from an industrial site (IS) and from a non-industrial site (NIS) for the study of their chemical composition and fatty acids profiles by gas liquid chromatography (GLC). These studies revealed large changes in the major and minor fatty acids of the soybean seeds due to the effect of chemical pollutants. There was a significant decrease in the amounts of major and minor fatty acids, such as myristic acid (14:0), palmitic acid (16:0), stearic acid (18:0), oleic acid (18:1), linoleic acid (18:2), and linolenic acid (18:3), in the seeds from industrial site. The changes in the chemical composition due to chemical pollutants showed mixed results
Synthesis of Biomass-Derived Activated Carbons and Their Immobilization on Alginate Gels for the Simultaneous Removal of Cr(VI), Cd(II), Pb(II), As(III), and Hg(II) from Water
Low-cost alginate gels of activated carbons were prepared,
which
were derived from the peels of banana and sweet lime. The synthesized
carbon was activated and immobilized on alginate, producing its gel.
These gels were categorized according to their methods of drying,
in which air drying, freeze drying, and supercritical drying led to
the formation of xerogels, cryogels, and aerogels, respectively. The
gels were used for adsorption of heavy metals from their aqueous solution.
The heavy metals that were targeted for removal were Pb(II), Cd(II),
Cr(VI), As(III), and Hg(II). Among all the adsorbents, the alginate
cryogel of sweet lime-derived activated carbon (SLACC) showed the
highest removal percentage of heavy metals, and thus, it was used
for batch study. The adsorption of heavy metals by SLACC was checked
at different times, pH values, adsorbent doses, temperatures, and
adsorbate concentrations. The study revealed that the pseudo-second-order
model best described the kinetic study, while the adsorption followed
the Freundlich isotherm. SLACC showed maximum adsorption capacities
(qcal) of 3.71, 4.22, 20.04, 7.31, and
4.37 mg/g for Cr, Cd, Pb, As, and Hg, respectively, when 20 mg of
SLACC was used for the removal of 4 ppm concentration of the targeted
heavy metals from their 20 mL solution. Based on the thermodynamic
study, it was found that the adsorption was spontaneous and exothermic.
Furthermore, the adsorbent was also used on real water samples and
showed up to 90% removal efficiency for these targeted heavy metals.
SLACC was regenerated with 0.1 M ethylenediaminetetraacetic acid (EDTA)
solution and reused for five cycles, in which the percentage removal
of heavy metals was more than 50% till the fourth cycle. Furthermore,
the leaching study showed that no toxic elements had leached from
SLACC into water, making it a safe adsorbent