Surface-modified chitin by TEMPO-mediated oxidation and adsorption of Cd(II)

Sun, Xubing; Zhu, J.; Gu, Qiuyue; You, Yaohui

doi:10.1016/j.colsurfa.2018.06.041

Cited by 32 publications

(5 citation statements)

References 40 publications

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“…Obviously, the quantity of carboxyl groups increases significantly from 0.15 to 1.3 mmol/g, confirming the successful oxidation of BSG. This is comparable to the literature , that the carboxyl group content of oxidized cellulose ranges from 0.4 to 1.4 mmol/g. Meanwhile, the content of free amine groups drops from 0.4 mmol/g to 0, which is also consistent with the removal of protein under the applied oxidation conditions.…”

Section: Resultssupporting

confidence: 90%

Recycling of Brewer’s Spent Grain as a Biosorbent by Nitro-Oxidation for Uranyl Ion Removal from Wastewater

Wenzel

Paasch

et al. 2021

ACS Omega

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Developing biosorbents derived from agro-industrial biomass is considered as an economic and sustainable method for dealing with uraniumcontaminated wastewater. The present study explores the feasibility of oxidizing a representative protein-rich biomass, brewer's spent grain (BSG), to an effective and reusable uranyl ion adsorbent to reduce the cost and waste generation during water treatment. The unique composition of BSG favors the oxidation process and yields in a high carboxyl group content (1.3 mmol/g) of the biosorbent. This makes BSG a cheap, sustainable, and suitable raw material independent from pretreatment. The oxidized brewer's spent grain (OBSG) presents a high adsorption capacity of U(VI) of 297.3 mg/g (c 0 (U) = 900 mg/L, pH = 4.7) and fast adsorption kinetics (1 h) compared with other biosorbents reported in the literature. Infrared spectra (Fourier transform infrared), 13 C solid-state nuclear magnetic resonance spectra, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and thermogravimetric analysis were employed to characterize the biosorbents and reveal the adsorption mechanisms. The desorption and reusability of OBSG were tested for five cycles, resulting in a remaining adsorption of U(VI) of 100.3 mg/g and a desorption ratio of 89%. This study offers a viable and sustainable approach to convert agro-industrial waste into effective and reusable biosorbents for uranium removal from wastewater.

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Section: Resultssupporting

confidence: 90%

Recycling of Brewer’s Spent Grain as a Biosorbent by Nitro-Oxidation for Uranyl Ion Removal from Wastewater

Wenzel

Paasch

et al. 2021

ACS Omega

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“…The Freundlich model describes that the adsorption process occurs on a heterogeneous surface. The Freundlich model can be expressed by Equation (7) [29]:qc=KF·Cr1n1 where KF represents the Freundlich constant and n 1 is the adsorption capacity index.…”

Section: Resultsmentioning

confidence: 99%

Efficient and Selective Adsorption of Gold Ions from Wastewater with Polyaniline Modified by Trimethyl Phosphate: Adsorption Mechanism and Application

et al. 2019

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The selective recovery of gold from wastewater is necessary because it is widely used in various fields. In this study, a new polymeric adsorbent (TP-AFC) was prepared by modifying polyaniline with trimethyl phosphate for the selective recovery of gold from wastewater. Bath experiments were carried out to explore the adsorption capacity and mechanism. The optimum pH of adsorption is 4. The adsorption equilibrium is reached at 840 min. The maximum adsorption capacity is 881 mg/g and the adsorption was a spontaneous endothermic process. The adsorption process fitted well with pseudo second-order kinetic and the Langmuir-models. The single-layer chemisorption governed the adsorption process. In addition, the application in wastewater indicated that the interfering ions had no effect on the adsorption of gold ions. TP-AFC has good selectivity. The interaction mechanism was mainly ion exchange and complexation. In general, TP-AFC was successfully prepared and has an excellent future in practical application.

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“…It was able to absorb 58 times more than their weight absorption capabilities. Sun et al (2018) modified chitin surface by employing 2,2,6,6-tetramethylpiperidine-1-oxyl radical with hypochlorite and sodium bromide. The process functionalized the chitin surface with carboxyl groups which enhanced the interaction between chitin and cadmium ions and enhanced the adsorption.…”

Section: Hydrophobic Modifications Of Chitin and Chitosanmentioning

confidence: 99%

Seafood waste: a source for preparation of commercially employable chitin/chitosan materials

Yadav

Goswami

Paritosh

et al. 2019

Bioresour. Bioprocess.

365

179

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Modern seafood processing practices result in amassment of a large volume of waste products, i.e., skin, head, tails, shells, scales, backbones, etc. These waste products may often encompass several high-value products which are still untapped due to the dearth of appropriate management. Moreover, inadequate disposal of waste also has negative implications on both environment and human health. This seafood waste often contains a huge amount of chitin, a polysaccharide that exhibits exceptional inherent characteristics including biocompatibility, biodegradability, antimicrobial, antitumor and antioxidant activities. The present review summarizes the existing methods for recovery of chitin and its derivatives from marine waste. The preparation of chitin nanoparticles was discussed along with blending of chitin and chitosan with other biopolymers. The recent trends of the application of chitin and chitosan nanostructures in various sectors were explored. This review is an attempt to highlight the extraction methods of chitin and chitosan from marine waste resources and its transformation into valuable commercial products as a solution to waste management.

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Surface-modified chitin by TEMPO-mediated oxidation and adsorption of Cd(II)

Cited by 32 publications

References 40 publications

Recycling of Brewer’s Spent Grain as a Biosorbent by Nitro-Oxidation for Uranyl Ion Removal from Wastewater

Recycling of Brewer’s Spent Grain as a Biosorbent by Nitro-Oxidation for Uranyl Ion Removal from Wastewater

Efficient and Selective Adsorption of Gold Ions from Wastewater with Polyaniline Modified by Trimethyl Phosphate: Adsorption Mechanism and Application

Seafood waste: a source for preparation of commercially employable chitin/chitosan materials

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