Preparation and characterization of carboxyl-functionalized chitosan magnetic microspheres and submicrospheres for Pb2+ removal

Xu, Yanyan; Dang, Qifeng; Liu, Chengsheng; Yan, Jingquan; Fan, Bing; Cai, Jinping; Li, Jingjing

doi:10.1016/j.colsurfa.2015.06.028

Cited by 48 publications

(18 citation statements)

References 40 publications

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“…However, the magnetic property of FeAC especially facilitates the magnetic separation process. BET specific surface area of CsFeAC is about 27.97 m 2 /g, much larger than those reported in the literature (Meng et al, 2015;Xu et al, 2015), which should be attributed to the larger specific surface area of AC. Hence more chitosan loading and better adsorption capacity…”

Section: Sem and Bet Analysiscontrasting

confidence: 63%

Preparation and adsorption properties of magnetic chitosan composite adsorbent for Cu 2+ removal

Jiang

Liu

et al. 2017

Journal of Cleaner Production

131

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Water pollution caused by Cu 2+ ions poses a significant threat to the ecosystem and human health, hence the development of highly cost-effective, highly operation-convenient and highly efficient natural polymer-based adsorbents is urgently needed. To overcome this serious problem, a novel cost-effective magnetic chitosan composite adsorbent (CsFeAC) was prepared with magnetic macroparticles and highly porous activated carbon carrier using the sol-gel method. Several methods, namely SEM, BET, FTIR, XRD, TGA and VSM, were applied to characterize the adsorbent. Batch tests were conducted to investigate Cu 2+ adsorption properties of CsFeAC at different pH values, contact time, initial Cu 2+ concentrations and temperatures. The adsorption fits better to the Langmuir isotherm and follows the pseudo-second-order model, suggesting that it is a monolayer adsorption and the rate-limiting step is the chemical chelating reaction. The saturated adsorption capacity is found to be 216.6 mg/g. Thermodynamics analysis suggests that the adsorption process is endothermic, with increasing entropy and spontaneous in nature. BET and XRD tests confirm that the higher specific surface area and lower crystallinity of CsFeAC significantly improve the absorption capacity and rate. FTIR spectra reveal that the amino and hydroxyl groups play an important role in the chelating adsorption. The supermagnetic property of CsFeAC facilitates its easy separation characteristic. Further recycling experiments show that CsFeAC still retains 95% of the original adsorption following the 5 th adsorption-desorption cycle. All these results demonstrate that CsFeAC is a promising recyclable adsorbent for removing Cu 2+ .

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Section: Sem and Bet Analysiscontrasting

confidence: 63%

Preparation and adsorption properties of magnetic chitosan composite adsorbent for Cu 2+ removal

Jiang

Liu

et al. 2017

Journal of Cleaner Production

131

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“…Carboxylated chitosan also has better thickening, heat preservation, film formation, flocculation, and kneading properties than chitosan. At the same time, carboxylated chitosan has wider applications than chitosan in the industrial, agricultural, medical, health, and biochemical fields [47,50,[52][53][54][55][56][57].…”

Section: Carboxylated Chitosanmentioning

confidence: 99%

Chitosan Derivatives and Their Application in Biomedicine

Wang

Meng

et al. 2020

IJMS

605

326

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Chitosan is a product of the deacetylation of chitin, which is widely found in nature. Chitosan is insoluble in water and most organic solvents, which seriously limits both its application scope and applicable fields. However, chitosan contains active functional groups that are liable to chemical reactions; thus, chitosan derivatives can be obtained through the chemical modification of chitosan. The modification of chitosan has been an important aspect of chitosan research, showing a better solubility, pH-sensitive targeting, an increased number of delivery systems, etc. This review summarizes the modification of chitosan by acylation, carboxylation, alkylation, and quaternization in order to improve the water solubility, pH sensitivity, and the targeting of chitosan derivatives. The applications of chitosan derivatives in the antibacterial, sustained slowly release, targeting, and delivery system fields are also described. Chitosan derivatives will have a large impact and show potential in biomedicine for the development of drugs in future.

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“…Even though obtaining imine-chitosan derivatives could be challenging due to the acidic aqueous media necessary to dissolve the polymer (which also should not allow the equilibrium to be displaced towards the imine products), several simple and mild aqueous methodologies have been reported allowing this type of reactions to be classified into the green chemistry field [22][23][24]. Chitosan, in different presentations, has already been tested in metal sorption studies with the purpose of being subsequently used in wastewater treatment with remarkable results [25][26][27][28][29]. Many of these studies have reported that the main center of metal ion interaction are the -NH 2 and -OH terminals of chitosan [30][31][32]; however, different functionalized chitosan species have shown to be very convenient since they stabilize the polymer in acid media making it insoluble and therefore allowing post sorption separation to be easier as they add new groups that can interact with different metals of interest [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

New chitosan-imine derivatives: from green chemistry to removal of heavy metals from water

Triana-Guzmán

Ruiz-Cruz

Romero

et al. 2018

Rev.Fac.Ing.Univ.Antioquia

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RESUMEN: Se sintetizaron tres nuevos derivados imino-quitosano por condensación entre los grupos amino terminales del quitosano y 4-bromometil-2-hidroxibenzaldehido A 1 , Ácido 4-formil-2-hidroxibenzoico A 2 , y (E)-6-((2-(piridin-2-il)hidrazono)metil)picolinaldehido A 3. Es de destacar en este trabajo que las reacciones fueron llevadas a cabo en medio acuoso empleando condiciones suaves de reacción (70°C). Los nuevos compuestos fueron caracterizados por RMN-1 H, FT-IR, análisis elemental, análisis termo gravimétrico (TGA) y calorimetría diferencial de barrido (DSC). Se realizó un estudio de solubilidad a diferentes valores de pH para los tres compuestos, estableciendo comportamientos diferentes a los obtenidos con el quitosano extraído. Por último, mediante medidas de absorción atómica, se investigó la capacidad de los derivados imino-quitosano en la remoción de iones de metales pesados en agua, tales como Pb(II) y Hg(II), el cual mostró un alto porcentaje de remoción a pH básicos pero uno a pH por debajo de 5. Adicionalmente la naturaleza del sustituyente determinó la solubilidad de los aductos resultantes ampliando así las potenciales aplicaciones de estos derivados de quitosano.

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Preparation and characterization of carboxyl-functionalized chitosan magnetic microspheres and submicrospheres for Pb2+ removal

Cited by 48 publications

References 40 publications

Preparation and adsorption properties of magnetic chitosan composite adsorbent for Cu 2+ removal

Preparation and adsorption properties of magnetic chitosan composite adsorbent for Cu 2+ removal

Chitosan Derivatives and Their Application in Biomedicine

New chitosan-imine derivatives: from green chemistry to removal of heavy metals from water

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