Modified chitosan for the collection of reactive blue 4, arsenic and mercury from aqueous media (original) (raw)
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Journal of the Brazilian Chemical Society, 2013
O adsorvente quitosana-Fe(III)-reticulado (Ch-FeCL) foi desenvolvido usando Fe(III) imobilizado em esferas de quitosana. Após o processo de secagem, as esferas apresentam um diâmetro de cerca de 1 mm e são estáveis ao ar. O comportamento de adsorção do As(III) e As(V) na Ch-FeCL foi avaliado em pH 7 por estudos realizados em batelada e em coluna. As máximas capacidades de adsorção estimadas pelo modelo de adsorção de Langmuir foram 21,24 e 27,59 mg g -1 para As(III) e As(V), respectivamente. A cinética de adsorção é descrita pela equação cinética de pseudo-segunda ordem. Os resultados de adsorção em coluna indicaram que o arsênio não foi encontrado na solução efluente até cerca de 60 e 759 volumes de leito para As(III) e As(V), respectivamente. Os resultados foram satisfatórios quando se empregou o adsorvente na remoção de As(III) e As(V) de amostras de águas subterrâneas, torneira e rio.
A Review on Chitosan for the Removal of Heavy Metals Ions
Journal of Fiber Bioengineering and Informatics, 2019
There has recently been an increasing interest in water treatment methods as a result of growing concerns over shortages of clean water. This paper aims to review the past and present researches on chitosan for the adsorption of heavy metals from the wastewater. Adsorption is considered to be the most efficient method for the removal of metal impurities from drinking water. Chitosan, a deacetylated derivative of chitin, has many commercial applications due to its biocompatibility, nontoxicity, and biodegradability. Moreover, amine groups are present on the backbone of chitosan. For this reason, chitosan has been used for the adsorption of heavy metals. To begin with, mechanism of adsorption of heavy metal ions on chitosan and disadvantages of heavy metal ions were reviewed. Further, a detailed review had been done on the adsorption capacities of crosslinked chitosan, chitosan nanofibers, chitosan nanoparticles, chitosan composites, modified/pure chitosan, and porous chitosan. Lastly, research gaps and future recommendations were given for further development and accurate results of adsorption.
Application of Chitosan-Based Filtration Technique for Removal of Heavy Metals from Surface Water
Surface water pollution in the surrounding rivers of Dhaka city has been threatening to the supply of potable water to the city dwellers. The major pollution parameters are pH, Turbidity, TDS, EC and Heavy metal concentration which indicates physical and chemical pollution in the river water. During the dry season pollution level in Buriganga River exceeds the surface water standard and it becomes unsuitable for drinking purpose. The objective of the present study was to reduce the level of physico-chemical parameters and heavy metal concentration in surface water by Chitosan adsorbent. Chitosan was prepared in laboratory. The tests were carried out with two different filter where Chitosan-sand and Charcoal-sand were used as adsorbent (filter material). pH was found in river water ranging from 7.8 to 8.0, after chitosan treatment it was reduced and ranged from 7.1 to 7.8. No significant change occurred in charcoal treatment. Highest Turbidity, TDS and EC in river water was found 116 NTU, 192 mg/l and 372 µs/cm respectively and it was reduced by Chitosan with an average efficiency of 94.01 % , 85.33 %., 84.91 %. In the case of Charcoal treatment, the average efficiency was only 23.55 %, 11.41 % and 12.26 % for Turbidity, TDS and EC respectively. Heavy metal Pb, Cr, Zn, and Ni was found in river water ranging from 8.9368 to 10.900 ppm, 70.320 to 73.576 ppm, 16.595 to 19.231 ppm and 6.003 to 6.8730 ppm respectively. This level was significantly reduced by Chitosan with an average efficiency of 99.76 %, 99.89 %, 99.89 % and 99.87% respectively. For Charcoal treatment this efficiency was too low. Using Chitosan for household water treatment process and for water treatment in remote areas or sudden flood areas where chemical treatment is not available, might be considered as an excellent option for water purification.
Development of Bioadsorbent Chitosan from Shrimp Shell Waste to Mercury Absorption Efficiency
IOP Conference Series: Earth and Environmental Science, 2020
This study aims to develop chitosan bioadsorben from shrimp shell waste that is applied to water samples in unlicensed mining activities in the Bone River of Gorontalo Province. The properties of chitosan were characterized, such as the determination of water content, ash content, solubility test and determination of acetylation degree by using FTIR. Prior to the application of chitosan products into samples in unlicensed mines locations, a qualitative metal mercury test was conducted on the samples using specific reagents for mercury metals, namely HCl, KI, NaOH, and NH3. The result showed that chitosan deacetylation degree was 73.88%, characterization test fulfilled chitosan standard requirement that was ash content 0.4%, water content 6.48% and soluble in acetic acid. Chitosan products from shrimp shell waste can be used as an environmentally friendly bioadsorbent that can reduce the level of mercury metal in the unlicensed mining activities in the Bone River of Gorontalo Provinc...
Carbohydrate Polymers, 2019
For biomedical applications, chitosan and oligochitosan must be appropriately characterized and meet pharmacological requirements in terms of contamination by residual heavy metals. In this work, a series of commercial chitosans was analyzed by ICP-MS method, and high concentration of Fe (44-382 ppm), Cr (3.1-35.5 ppm) and Ni (0.33-7.91 ppm) exceeding pharmacologically acceptable level was found. It was shown that as a chelating agent EDTA was an ineffective remedy for solid-phase extraction of residual heavy metals from chitosan. It was proposed that corrosion of stainless steel apparatus in the process of chitin deacetylation contributed to chitosan contamination by heavy metals. A two-step treatment of chitosan with hydrochloric acid allowed remediation of chitosan and preparation of oligochitosan hydrochloride with molecular weight 5-16 kDa and acceptable level of Fe < 10, Cr < 1 and Ni < 1 ppm.
Adsorption of dyes and heavy metal ions by chitosan composites: A review
Carbohydrate Polymers, 2011
The application of low-cost adsorbents obtained from plant wastes as a replacement for costly conventional methods of removing heavy metal ions from wastewater has been reviewed. It is well known that cellulosic waste materials can be obtained and employed as cheap adsorbents and their performance to remove heavy metal ions can be affected upon chemical treatment. In general, chemically modified plant wastes exhibit higher adsorption capacities than unmodified forms. Numerous chemicals have been used for modifications which include mineral and organic acids, bases, oxidizing agent, organic compounds, etc. In this review, an extensive list of plant wastes as adsorbents including rice husks, spent grain, sawdust, sugarcane bagasse, fruit wastes, weeds and others has been compiled. Some of the treated adsorbents show good adsorption capacities for Cd, Cu, Pb, Zn and Ni.
Chitosan Isolation and Its Application to Reduce the Content of Metal Ions in Wellbore Water
Jurnal Neutrino
Potential water sources such as white shrimp shell waste (Penaeus merguiensis) can be used as a source of chitosan. Chitosan can be applied as an environmentally friendly adsorbent for water treatment because of its ability to adsorb metal ions. In this study, chitosan was isolated through several stages such as demineralization, deproteination, decolourization and deacetylation. The yield of chitosan obtained from this study was 17.73%. Characterization by infrared spectroscopy (FTIR) showed the absorption at 3355 cm-1 indicating the presence of amine (-NH2) and hydroxyl (-OH) groups. The absorption of the carbonyl group (-C=O) at 1642 cm-1 disappeared while the absorption of the free amine group (-NH2) at 1590 cm-1 increased indicating the successful deacetylation with a degree of deacetylation (DD) 78%. Application of chitosan in wellbore water did not affect on colour change and decreasing of iron (Fe) content due to low concentration of iron (Fe). However, chitosan can reduce t...
Beneficial Effects of Cysteine in Modification of Chitosan in Handling Mercury Waste
European Chemical Bulletin, 2012
The present study put an emphasis on the handling of mercury waste by using modified chitosan which obtained from shrimp shell as waste of frozen shrimp. The main aim of the study was to find out the effectiveness of cysteine as modifier to chitosan and its application for adsorption of mercury metal at water bodies. The characterisation study of adsorbent, chitosan-cysteine was done using FT-IR and SEM-EDX, wheres maximum adsorption limit was determined by AAS. The effects of parameters like pH, contact time, maximum adsoption capacity was studied at isothermal condition, on the adsorption process under study. Mechanism of adsorption process was studied according to adsoption kinetic model based under pseudo-first order and pseudo-second order, wheres adsorption isothermal was determined based on Langmuir and Freundlich isotherms. The results of the study indicate that the increase of cysteine amount in the synthetic process has no significant effect on the acquisition of % yiel...
International Journal of Applied Pharmaceutics, 2022
Objective: Crustacean shell waste is not currently used to its full potential. Most waste from crustaceans used in food pollutes the environment. Widely found in crab shell waste and shrimp shell waste, chitosan is a modification of chitin compounds. This study aims to utilize crustacean shell waste (crab shell waste and shrimp shell waste) as a natural adsorbent against heavy metals and dyes in the form of chitosan. Methods: This study includes the steps of extracting chitosan from crab shell waste and shrimp shell waste, followed by adsorption capacity tests against heavy metals (mercury and arsenic) and dyes (tartrazine and amaranth). Results: Chitosan sourced from both crab shell waste and shrimp shell waste met the physical and chemical characteristic requirements, and the yield was 28.19% and 18.33%, respectively. The adsorption capacity against heavy metals and dyes from crab shell waste chitosan ranged from 43.4% to 55.6% and the shrimp shell waste chitosan ranged from 50.8% to 60.2%. Conclusion: Crustacean shell waste can be processed into chitosan, which is valuable and can be used as a natural adsorbent against heavy metals and dyes for wastewater treatment in several industrial sectors.