In-situ modification, regeneration, and application of keratin biopolymer for arsenic removal

Khosa, Muhammad Arshad; Ullah, Aman

doi:10.1016/j.jhazmat.2014.06.023

Cited by 68 publications

(29 citation statements)

References 67 publications

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“…5). The bands at 600-700 cm -1 attributed to stretching vibration ν C-S and at 800-900 cm -1 attributed to rocking vibration δ S-H are specific to sulfur compounds (Khosa and Ullah, 2014;Hill et al, 2010;Staron et al, 2014). …”

Section: Structural Analysis Of Keratin Hydrolysates Using Ft-ir Specmentioning

confidence: 98%

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Study on Obtaining Keratin Extracts from Leather Industry By-products

Niculescu¹,

Berechet²,

Gaidău³

et al. 2016

The International Conference on Advanced Materials and Systems

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Keratin is a biopolymer with numerous functional properties for the production of biomaterials with applications such as: additives for cosmetics, biostimulator for growth and nutrition in agriculture, ecological treatments in reconstruction and protection of leather and furs, as alternative to pollutant chemical compounds. In most of the applications, in either large or niche industries, keratin is used as gels, films, nano-or micro-particles. This study presents the possibilities of using thermal and enzymatic processes of leather industry by-products to obtain keratin extracts. Keratin extracts were characterized by chemical and instrumental analyses: gravimetric, volumetric, potentiometry, Polyacrylamide Gel Electrophoresis, Infrared Spectroscopy, High-Performance Liquid Chromatography, Dynamic Light Scattering. Analytical investigation has shown that the keratin extracts obtained as polydispersions with 5% dry matter have 14% total nitrogen and contain 50% small and medium sized particles (10-500 nm range), such as free amino acids and oligopeptides and 50% larger sized particles (500-5560 nm ranges) such as polypeptides. The IR spectrum of keratin extract is similar to the IR spectrum of collagen from leather.

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Section: Structural Analysis Of Keratin Hydrolysates Using Ft-ir Specmentioning

confidence: 98%

“…Keratin extracts are obtained using acid hydrolysis (Khosa and Ullah, 2014), hydrolysis in alkaline medium (Hill et al, 2010;Staron et al, 2014), enzymatic hydrolysis (Krejci et al, 2011) and ionic liquid extraction (Ji et al, 2014). The various methods of obtaining keratin extracts lead to variations in their composition and properties.…”

Section: Introductionmentioning

confidence: 99%

Study on Obtaining Keratin Extracts from Leather Industry By-products

Niculescu¹,

Berechet²,

Gaidău³

et al. 2016

The International Conference on Advanced Materials and Systems

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“…Meanwhile, referring to Figures 3c and 4c which identify the interaction between agitation speed and pH value, they reflect different effects on both heavy metal ions. As in for Pb 2+ metal ions, the agitation speed does not have a significant effect on the removal percentage of Pb 2+ metal ions because the suspension may not become homogenous due to the rapid agitation, increasing the boundary layer between solid and liquid phase, hence lowering the removal percentage [49][50][51]. On the other hand, for the Cr 3+ metal ions, as the agitation speed increases, the removal percentage increases owing to higher kinetic energy in which more molecules collide with each other increasing the adsorption capacity into the CNT binding sites, leading to higher removal percentages of Cr 3+ metal ions [52].…”

Section: Statistical Analysis Of Adsorption Of Pb 2+ and Cr 3+ Onto Cntsmentioning

confidence: 99%

“…increasing the boundary layer between solid and liquid phase, hence lowering the removal percentage [49][50][51]. On the other hand, for the Cr 3+ metal ions, as the agitation speed increases, the removal percentage increases owing to higher kinetic energy in which more molecules collide with each other increasing the adsorption capacity into the CNT binding sites, leading to higher removal percentages of Cr 3+ metal ions [52].…”

Section: Statistical Analysis Of Adsorption Of Pb 2+ and Cr 3+ Onto Cntsmentioning

confidence: 99%

“…This proves that the removal of Cr 3+ metal ions works well in high pH value as it is more easily adsorbed into the CNTs surface [53,54]. The correlation of four parameters used in this research study for the removal of both Pb 2+ and Cr 3+ heavy metal ions are based on the analysis; it was found that the optimized conditions of parameter for the maximum removal of Pb 2+ as much as 99.9% could be attained with pH 4.0, agitation speed 150 rpm and the agitation time of 50, adsorbent dosage 0.09 g. As for Cr 3+ ion, the increasing the boundary layer between solid and liquid phase, hence lowering the removal percentage [49][50][51]. On the other hand, for the Cr 3+ metal ions, as the agitation speed increases, the removal percentage increases owing to higher kinetic energy in which more molecules collide with each other increasing the adsorption capacity into the CNT binding sites, leading to higher removal percentages of Cr 3+ metal ions [52].…”

Section: Statistical Analysis Of Adsorption Of Pb 2+ and Cr 3+ Onto Cntsmentioning

confidence: 99%

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Comparative Kinetic Study of Removal of Pb2+ Ions and Cr3+ Ions from Waste Water using Carbon Nanotubes Produced using Microwave Heating

Mubarak

Thobashinni

Abdullah

et al. 2016

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A comparative study of the removal of Pb 2+ ions and Cr 3+ ions was conducted to determine the efficiency of carbon nanotubes (CNTs) produced using microwave heating as an adsorbent in removing heavy metal ions from waste water. Optimization of parameters such as adsorbent dosage, pH value, agitation speed, and agitation time was done using the Design Expert software version 6.0. The statistical analysis revealed that optimized conditions for the highest removal for Pb 2+ are at pH 4.0, CNTs dosage of 0.09 g, agitation time and speed of 50 min and 150 rpm respectively. Meanwhile, the highest removal Cr 3+ ions was observed at pH 8.0, CNTs dosage of 0.09 g, agitation time and speed of 60 min and 150 rpm respectively. For the initial concentration of 2 mg/L, the removal efficiency of Pb 2+ ions and Cr 3+ ions were 99.9% and 95.5% respectively. The maximum adsorption capacities of both Pb 2+ ions and Cr 3+ ions onto the CNT were 15.34 mg/g for Pb 2+ ions and 24.45 mg/g for Cr 3+ ions. Besides that, the Langmuir and Freundlich constants for the removal of Pb 2+ ions were 0.073 and 1.438 L/mg while 0.071 and 1.317 L/mg for Cr 3+ ions. The statistical analysis proved that the removal of Pb 2+ ions and Cr 3+ ions fits the Langmuir and Freundlich isotherm models, and both models obeyed the pseudo-second-order.

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Recycling of chicken feathers

Xu,

Shan,

Chen

et al. 2024

Carbon Neutralization

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The extensive consumption of chicken has resulted in the emergence of a significant environmental issue in the form of chicken feather waste. As such, there is an urgent need for the development of green treatment and recycling methods for chicken feathers. Chicken feathers can serve as a type of heteroatomic doping carbon source, making them an excellent candidate for the electrode materials used in electrochemical energy devices. Furthermore, their unique structures and functional groups make them highly promising for use as adsorbents, electronics, and building materials. In this paper, we provide a summary and review of recent progress made in the use of chicken feathers for energy and environmental applications. Based on the theoretical knowledge and practical applications presented in this review, promising green recycling processes of chicken feathers can be developed. These processes can help to reduce environmental pollution and promote sustainable development.

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In-situ modification, regeneration, and application of keratin biopolymer for arsenic removal

Cited by 68 publications

References 67 publications

Study on Obtaining Keratin Extracts from Leather Industry By-products

Study on Obtaining Keratin Extracts from Leather Industry By-products

Comparative Kinetic Study of Removal of Pb2+ Ions and Cr3+ Ions from Waste Water using Carbon Nanotubes Produced using Microwave Heating

Recycling of chicken feathers

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