M. Priyanga, depertment of the Sri Paramakalyani Centre of Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, Tamil Nadu, India. V. Gomathi Priya, depertment of the Post Graduate & Research Centre of Microbiology, Sri Paramakalyani College, Manonmaniam Sundaranar University, Alwarkurichi, India. P. Bhuvaneswari, depertment of the JP College of Arts and Science, Department of Chemistry, College Road, Agarakattu, Ayikudi, Tamil Nadu, India. T. Shanmuga Vadivu, depertment of the JP College of Arts and Science, Department of Chemistry, College Road, Agarakattu, Ayikudi, Tamil Nadu, India. S. Viswanathan, depertment of the Post Graduate & Research Centre of Microbiology, Sri Paramakalyani, depertment of the College, Manonmaniam Sundaranar University, Alwarkurichi, India. G. Annadurai, depertment of the Sri Paramakalyani Centre of Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, Tamil Nadu, India. R. Soranam, depertment of the Sri Paramakalyani Centre of Excellence in Environmental Sciences, Manonmaniam Sundaranar University, Alwarkurichi, Tamil Nadu, India. Wrote a research article about, Modified Crab-Shell Chitosan for Dye Adsorption and Optimization. entitled, Using chitosan made from modified chitosan (Crab shells) for dye adsorption, equilibrium, kinetic, and response surface methods. This research paper published by the Journal of Biodiversity and Environmental Sciences | JBES. an open access scholarly research journal on Environmental Sciences. under the affiliation of the International Network For Natural Sciences| INNSpub. an open access multidisciplinary research journal publisher.
Abstract
Adsorption techniques
based on the use of natural polymers, such as non-toxic chitosan, which is made
from leftover crab shells by demineralization (acid treatment) and
deproteinization (alkaline treatment), have drawn more attention in recent
years. The most popular method for advanced wastewater treatment is adsorption.
Because of its many functional uses, chitosan is frequently employed as an
efficient biomaterial in the field of adsorption. Chitosan’s hydroxyl (-OH) and
amine (-NH2) groups make it one of the most appropriate and adaptable
adsorbents. By adding more functions to its fundamental structure, chitosan
adsorption capability and selectivity can be further enhanced. While the
Langmuir, Freundlich Isotherms study and kinetics investigations demonstrated
that the adsorption process was suited by pseudo-first-order and second order
for dye, the results from isotherm models demonstrated that the adsorption of
dye on chitosan corresponded well with the Freundlich model. These three
distinct factors influencing methylene blue adsorption performance were chosen
for modelling and optimization procedures utilizing response surface methods in
a central rotating composite design. A second-degree polynomial equation was
used to predict the percentage of methylene blue elimination by chitosan made
from crab shells. With an R2 = 0.9934 and a Radj = 0.9849, the proposed model
was valid and accurately described the phenomenon investigated in the
experimental area.
Introduction
When numerous
industries produce garbage that seriously pollutes the environment,
environmental protection becomes a challenging undertaking. Large amounts of
aqueous wastes and dye effluents with high BOD loading and strong, lasting
color are released from the dyeing process in the textile sector, which is
unsatisfactory from an aesthetic and environmental standpoint (Annadurai and
Krishnan, 1997). Aquatic life is seriously at risk because the majorities of
these dye wastes are poisonous and may cause cancer (Vandevere et al., 1998).
Consequently, the elimination of dyestuffs from effluents becomes crucial, and
numerous governments have imposed environmental regulations concerning the
quality of colored effluents and mandated that enterprises that use dyes
decolorize their effluents before to discharge. Numerous conventional dye
removal treatment systems, including trickling filters, activated sludge,
chemical coagulation, carbon adsorption, and photodegradation processes, have
been thoroughly studied (Vandevere et al., 1998; Ganesh et al., 1994; Gan Yang
et al., 2008). Among these chemical and physical techniques, the adsorption
process is reasonably successful in producing a highquality effluent without
the production of hazardous compounds like ozone and free radicals during the
UV photodegradation process.
Activated carbon
(Walker and Weatherley, 1997), peat (Poots et al., 1976a;1976b; Ho and Mckay,
1998), pith (Mckay et al., 1987; Namasivayam et al., 1998; Ho and Mckay, 1999;
Namasivayam et al., 2001; Namasivayam et al., 2002), fuller's earth (Atun et
al., 2003; Mckay et al., 1985), and wood (Poots et al., 1976a;1976b; Asfour et
al., 1985). The potential uses of polymeric nanoparticles in medicine and
nanotechnological devices, especially as drug delivery vehicles, have drawn
more interest in recent years. These nanoparticles are manufactured with a
regulated composition, unique supramolecular structures, and dimensions. Due to
intra- and or intermolecular interactions of hydrophobic segments in aqueous
media, these polymeric nanoparticles with hydrophilic and hydrophobic segments
have special properties, including thermodynamic stability, unusual rheological
features, and the structure of a hydrophilic shell and a hydrophobic core (Chu
and Tsui, 1999; El-Geundi, 1991; Grau, 1991). Polymeric amphiphiles have been
thoroughly investigated and identified as promising medication and gene
delivery vehicles due to their ability to decrease harmful side effects and
enhance therapeutic outcomes. Preparing biodegradable and nontoxic polymeric
amphiphiles based on natural biomaterials like chitosan has received a lot of
attention lately.
Chitin is deacetylated
to generate chitosan, a heteropolymer comprising β - [1→4]-2-amino-2-
deoxy-D-glucopyranose and β - [1→4]-2-acetamido2-deoxy-D-glucopyranose. An
essential part of the adsorption process is chitosan; a type of natural
polysaccharide made from chitin. The b (1-4)-2- amino-2-deoxy-D-glucopyranose
(D-glucosamine) repeating unit makes up the majority of chitosan, a
polysaccharide that also contains trace amounts (less than 20%) of N-acetyl-D
glucosamine residues (Ali Aberoumand and Maryam Hosseinian, 2025). The polymer
has a very high affinity for a variety of dye classes, including disperse,
direct, reactive, and acid dyes. It is also non-toxic and biodegradable.
Through electrostatic attraction, cationized amino groups can adsorb anionic
dye molecules in an acidic aqueous media. The manufacture of chitosan from crab
shells is the subject of the proposed study (Musmade and Lalit Mahatma Ali
Aberoumand, 2021). The purpose of this research is to achieve the best removal
efficiency of methylene blue with short contact and settling durations.
Chitosan has been well examined for its capacity to remove dye from textile
wastewater effluent. Experiments on a bench scale were carried out to
investigate the impact of temperature and pH. Because of its vast surface area,
the chitosan is thought to have a greater capacity. The sorption behavior of
the chitosan research will be examined (Anggraeni et al., 2024).
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