Facile synthesis of high performance porous magnetic chitosan - polyethylenimine polymer composite for Congo red removal

You, Lijun; Huang, Chenguang; Lu, Fu-Hsing; Wang, Ao; Liu, Xiaocui; Zhang, Qiqing

doi:10.1016/j.ijbiomac.2017.10.025

Cited by 100 publications

(34 citation statements)

References 47 publications

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“…As shown in Fig. 1c and d, the removal capacity rapidly decreased with increasing adsorbent dosage and then the trend slowed down when dosage was above 0.05 g, which was similar to other reports (Adeogun and Babu, 2015;Jiang et al, 2016;You et al, 2018). Compared to the individual removal of Pb 2þ or MG at the dosage of 0.01 g (Fig.…”

Section: Effects Of Temperature and Dosagesupporting

confidence: 88%

Competitive removal of Pb2+ and malachite green from water by magnetic phosphate nanocomposites

et al. 2019

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The competitive removal of Pb 2þ and malachite green (MG) from water by three magnetic phosphate nanocomposites (Fe 3 O 4 /Ba 3 (PO 4) 2 , Fe 3 O 4 /Sr 5 (PO 4) 3 (OH), and Fe 3 O 4 /Sr 5x Ba 3x (PO 4) 3 (OH), namely "FBP", "FSP", and "FSBP", respectively) was systematically investigated compared with Fe 3 O 4 ("F") nanoparticle. Temperature and adsorbent dosage for competitive removal were optimized to be 20 C and 0.05 g in 50 mL. The kinetic and isothermal adsorption results were fitted well with the pseudo-second-order model and Langmuir model, respectively. In the competitive removal process, FSP showed a high affinity to Pb 2þ (202.8 mg/g) while FBP possessed high selectivity for MG (175.4 mg/g), and FSBP was effective at simultaneous removal of Pb 2þ and MG, with a capacity of 143.7 and 90.9 mg/g, respectively. The magnetic contents in nanocomposites allow magnetic separation of materials from the water after treatment. We proposed that the simultaneous removal mechanism by FSBP was due to ion exchange between Pb 2þ and Sr 2þ in the lattice and then the formation of hydrogen bonds between PO 4 3À outside the material's surface and positively charged hydrogen in MG. This study indicates the potential of these phosphate nanocomposites to be used as effective materials for selective or simultaneous removal of Pb 2þ and MG from water.

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Section: Effects Of Temperature and Dosagesupporting

confidence: 88%

Competitive removal of Pb2+ and malachite green from water by magnetic phosphate nanocomposites

et al. 2019

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“…In the FTIR spectrum of ZnO nanoparticles (Figure 3(a)), the peak at 3449 cm −1 corresponds to the O-H stretching vibration of H 2 O in ZnO; the peak at 1634 cm −1 may be due to the O-H bending vibration; the H-O-H bending vibration or the absorbed CO 2 bands may be responsible for the peak at 1382 cm −1 ; and the band in the range of 528-435 cm −1 refers to the stretching mode of Zn-O [24][25][26]. In the spectrum of chitosan ( Figure 3(b)), the broad peak at 3463 cm −1 is due to the -OH/-NH 2 stretching vibration; the peaks at 2930 and 2860 cm −1 are attributed to the C-H stretching vibration; the peak at 1651 cm −1 corresponds to the amino group bending vibrations; the peak at 1564 cm −1 may be due to the deformation of amide II; and the peaks at 1064 and 1023 cm −1 may refer to the C-O stretching vibration [27][28][29][30][31]. Compared to the spectrum of chitosan, a new band from 528 to 412 cm −1 referring to the Zn-O stretching appears in the spectrum of ZnO/chitosan strong intermolecular hydrogen bonding interaction between chitosan and ZnO [32].…”

Section: Resultsmentioning

confidence: 99%

In Situ Synthesis and Characterization of ZnO/Chitosan Nanocomposite as an Adsorbent for Removal of Congo Red from Aqueous Solution

Nguyen

Nguyen³

2020

Advances in Polymer Technology

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ZnO/chitosan nanocomposite was successfully synthesized by in-situ precipitation method. The material was characterized by XRD, FESEM, TEM, FTIR, BET, and TGA. Results show that ZnO/chitosan nanocomposite has spherical shape with the average size of 20–25 nm. BET surface area and the average pore size of ZnO/chitosan nanocomposite are 2.2436 (m2/g) and 12.2 nm, respectively. The material was applied as an adsorbent for congo red removal from aqueous solutions. The congo red adsorption is better described by the Langmuir model (R2=0.996) than by the Freundlich model (R2=0.962). Therefore, it can be presumed that congo red was adsorbed in a single monolayer with the theoretical maximum adsorption capacity of 227.3 (mg/g). This is comparable to other available adsorbents. It can be suggested that ZnO/chitosan nanocomposite could serve as promising adsorbent for congo red in wastewater treatment technology.

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“…The NP-PEIP was conserved at room temperature at neutral pH during few months without important loss of activity confirming the fact that coating is important for immobilized enzyme performance providing higher stability. 191 You et al, 192 also used polyethylenimine in their studies. Magnetic chitosan-polyethylenimine (Fe 3 O 4 /CS-PEI) polymer composite was synthesized.…”

Section: Magnetic Nanoparticles Hybridmentioning

confidence: 99%

Design of Immobilized Enzyme Biocatalysts: Drawbacks and Opportunities

Reis

Sousa

Serpa

et al. 2019

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The enzymatic processes are increasingly highlights, especially in the synthesis of chemical products with high added value. The enzyme immobilization can improve industrial biocatalytic processes. The immobilization of enzymes provides the production of efficient, stable biocatalysts, possibility of reuse and easy purification of the products, when compared to the free enzymes. There is a growing research for more efficient methods of enzyme immobilization. In this context, the choice of support and immobilization strategy can significantly improve the final enzymatic properties. In this review paper, we aimed to discuss the versatility of biocatalysts immobilized enzymes design, focusing on the opportunities and disadvantages for each method presented. They discussed the recent development of enzyme immobilization methods and applications relating the final properties of the produced biocatalysts with the desired goals.

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Facile synthesis of high performance porous magnetic chitosan - polyethylenimine polymer composite for Congo red removal

Cited by 100 publications

References 47 publications

Competitive removal of Pb2+ and malachite green from water by magnetic phosphate nanocomposites

Competitive removal of Pb2+ and malachite green from water by magnetic phosphate nanocomposites

In Situ Synthesis and Characterization of ZnO/Chitosan Nanocomposite as an Adsorbent for Removal of Congo Red from Aqueous Solution

Design of Immobilized Enzyme Biocatalysts: Drawbacks and Opportunities

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