TEOS as an improved alternative for chitosan beads cross‐linking: A comparative adsorption study

Copello, Guillermo Javier; Villanueva, María Emilia; González, Joaquín; Egües, Sofía López; Díaz, Luis Eduardo

doi:10.1002/app.41005

Cited by 21 publications

(9 citation statements)

References 48 publications

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“…Previous studies on optimization of boron removal that adsorbed by different adsorbent are compared with the M. oleifera adsorption in terms of pH and adsorption capacity. The optimum pH value for M. oleifera was in agreement with other adsorbents such as rice husk, date seed ash, chitosan and magnesite-bentonite clay where the values were in the range of pH 7 to 10 which was in an alkaline environment [27][28][29][30]. Meanwhile, M. oleifera presented higher adsorption capacity than chitosan and magnesite-bentonite clay [27,30].…”

Section: Modelling By Statistical Analysissupporting

confidence: 80%

Parameter Effects of Ph, Dosage and Contact Time on Boron Removal From Synthetic Sea Water Using Moringa Oleifera Seeds

Jami¹,

Zakaria²,

Ahmed³

et al. 2020

IIUMEJ

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Boron is one of the key elements required in flora, fauna, as well as human beings. However, human life and eco-systems could be seriously affected when exposed to excessive levels of boron, especially in seawater and groundwater. In this work Moringa oleifera was selected as a precursor adsorbent owing to its eco-friendliness characteristics and favourable removal efficiency of adsorbates. Besides, M. oleifera does not significantly affect the conductivity of water and pH value after the treatment. The main aim of this work was to investigate the potentiality of M. oleifera in the treatment of boron from contaminated saline water. The effect of adsorption parameters such as pH (7 - 9), adsorbent dose of 4000 – 8000 mg/L of solution and contact time of 60 – 180 min was thoroughly investigated. Face-centred Central Composite Design (FCCCD) was applied to optimize these parameters. Consequently, the highest percentage of removal (65%) was achieved at the pH of 8, 120 min of contact time and 6000 mg/L of adsorbent dosage. The adsorption studies stated that the adsorption fitted well with the Freundlich isotherm. Therefore, the outcome of this work revealed that boron could be significantly treated using a prepared adsorbent from M. oleifera. ABSTRAK: Boron merupakan salah satu elemen yang diperlukan oleh flora, fauna, juga manusia. Walau bagaimanapun, hidup manusia dan ekosistem pasti terkesan apabila di dedahkan secara berlebihan, terutama pada air di lautan dan daratan. Kajian ini menggunakan Moringa oleifera sebagai penjerap kerana ia mempunyai ciri-ciri mesra dan berkesan membuang bahan terjerap dengan berkesan. Selain itu, M. oleifera tidak langsung memberi kesan kepada konduktiviti air dan nilai pH selepas perawatan. Tujuan utama kajian ini adalah mengkaji potensi M. oleifera dalam larutan rawatan air garam boron yang tercemar. Kesan parameter penjerapan seperti pH (7-9), dos penjerapan 4000 – 8000 mg/L larutan dan masa interaksi 60 – 180 minit di kaji dengan teliti. Kaedah Komposisi Tumpuan Tengah Muka (FCCCD) digunakan bagi mengoptimumkan parameter-parameter ini. Hasilnya, peratus tertinggi penyingkiran adalah sebanyak (65%) pada pH 8, 120 min masa interaksi dan 6000 mg/L dos penjerapan. Kesimpulannya, kajian penjerapan ini menyokong kuat teori isoterma Freundlich. Oleh itu, hasil kajian ini menunjukkan boron dapat dirawat dengan menggunakan larutan penjerapan daripada M. oleifera.

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Section: Modelling By Statistical Analysissupporting

confidence: 80%

Parameter Effects of Ph, Dosage and Contact Time on Boron Removal From Synthetic Sea Water Using Moringa Oleifera Seeds

Jami¹,

Zakaria²,

Ahmed³

et al. 2020

IIUMEJ

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“…The mean uptake of Cr(VI) showed a relatively fast initial rate on the first 20 min. which is similar to the rapid 22 . This study determined the PZNC of the adsorbent at pH 6.69.…”

Section: Kinetic Profilesupporting

confidence: 69%

Batch Adsorption Study and Kinetic Profile of Cr(VI) Using Lumbang (Aleurites moluccana)-Derived Activated Carbon-Chitosan Composite Crosslinked With Epichlorohydrin

Villarante¹,

Bautista²,

Sumalapao³

2017

Orient. J. Chem

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Batch adsorption of toxic Cr(VI) ion from an aqueous solution using lumbang (Aleurites moluccana) activated carbon-chitosan composite crosslinked with epichlorohydrin as an adsorbent was investigated. The adsorption experiments were performed at varying pH, agitation time, initial Cr(VI) ion concentration, temperature, and adsorbent dose. At an initial concentration of 60 ppm Cr(VI), the maximum adsorption was observed at pH 3, adsorbent dose of 3 g/L, contact time of 75 min, and temperature of 30 o C. Analysis of the experimental data using different kinetic models revealed that the biosorption phenomenon behaved under a pseudo second-order rate mechanism.

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“…Despite the large number of papers dedicated to the removal of dyes by hydrogels, most of them focus on the evaluation of biosorption performance and only a few of them aim at gaining a better understanding of the role of the cross-linking agent. Copello et al (2014) proposed chitosan hydrogel beads modified by three different crosslinking treatments, glutaraldehyde and epichlorohydrin and tetraethoxysilane. The authors studied and characterized the behavior of hydrogel cross-linked using a tetraethoxysilane /chitosan ratio of 1 mmol/g.…”

Section: A Recent Review Of the Literature On Dye Removal By Chitosanmentioning

confidence: 99%

Dye removal by biosorption using cross-linked chitosan-based hydrogels

et al. 2019

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Synthetic dyes are an important class of recalcitrant organic compounds that are often found in the environment as a result of their wide industrial use. There are estimated to be more than 100,000 commercially available dyes. These substances are common contaminants, and many of them are known to be toxic or carcinogenic. Colored effluents from the industry is perceived by the public as an indication of the presence of a dangerous pollution. Even at very low concentrations, dyes are highly visible-an esthetic pollution-and modify the aquatic life and food chain, as a chemical contamination. Dye contamination of water is a major problem worldwide, and the treatment of wastewaters before their discharge into the environment has become a priority. Dyes are difficult to treat due to their complex aromatic structure and synthetic origin. In general, a combination of different physical, chemical and biological processes is often used to obtain the targeted water quality. Nonetheless, there is a need to develop new removal strategies and decolorization methods that are more effective, acceptable for industrial use and ecofriendly. Currently, there is increasing interest in the application of biological materials as effective adsorbents for dye removal. Among all the materials proposed, cross-linked chitosan-based hydrogels are the most popular biosorbents. These polymeric matrices are the object of numerous fundamental studies. In this review, after a brief description of the use of chitosan in wastewater treatment and the basic principles of chitosan-based hydrogels and biosorption, we focus on some of the work published over the past 5 years. Overall, these polymeric materials have demonstrated outstanding removal capabilities for some dyes. They might be promising biosorbents for environmental purposes.

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TEOS as an improved alternative for chitosan beads cross‐linking: A comparative adsorption study

Cited by 21 publications

References 48 publications

Parameter Effects of Ph, Dosage and Contact Time on Boron Removal From Synthetic Sea Water Using Moringa Oleifera Seeds

Parameter Effects of Ph, Dosage and Contact Time on Boron Removal From Synthetic Sea Water Using Moringa Oleifera Seeds

Batch Adsorption Study and Kinetic Profile of Cr(VI) Using Lumbang (Aleurites moluccana)-Derived Activated Carbon-Chitosan Composite Crosslinked With Epichlorohydrin

Dye removal by biosorption using cross-linked chitosan-based hydrogels

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