Facile preparation of polyethylenimine-tannins coated SiO2 hybrid materials for Cu2+ removal

Huang, Qiang; Liu, Meiying; Zhao, Jiao; Chen, Junyu; Zeng, Guangjian; Huang, Hongye; Tian, Jianwen; Wen, Yuanqing; Zhang, Xiaoyong; Wei, Yen

doi:10.1016/j.apsusc.2017.08.233

Cited by 168 publications

(46 citation statements)

References 64 publications

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“…Combined with the single Si 2p peak at 102.37 eV, it can be then conjectured that silica was mineralized on the surface of LPEI (Fig. (d)) …”

Section: Resultsmentioning

confidence: 98%

“…2, line d), the characteristic peaks of C (C 1s at 285.26 eV), N (N 1s at 399.26 eV) and Si (Si 2p at 103.26 eV) were observed. 28 Compared with LPEI/PSS wileyonlinelibrary.com/jctb cordierite-H, the as-formed LPEI/PSS cordierite-H-OSi exhibited lower contents of C and N but rather higher content of Si, which meant the silicification indeed occurred on the surface of LPEI/PSS cordierite-H ( Table 1).…”

Section: Preparation and Characterization Of Monolithic Scaffoldsmentioning

confidence: 99%

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Bioinspired synthesis of nanofibers on monolithic scaffolds for enzyme immobilization with enhanced loading capacity and activity recovery

Shi

Zhao

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND The enzymatic process in continuous flow reactors has become attractive owing to the merits of in‐line purification, improved mixing and mass transfer, etc. However, the construction of continuous flow reactors requires stable and surface‐active monolithic scaffolds for enzyme immobilization. RESULTS In this study, nanofibers of linear polyethyleneimine (LPEI) are formed on the surface of poly(sodium 4‐styrenesulfonate) (PSS)‐treated cordierite honeycomb (named LPEI/PSS cordierite‐H) as monolithic scaffold for enzyme immobilization. The controlled self‐assembly of LPEI ensures the formation of nanofibers (diameters of 20–80 nm) on the surface of cordierite‐H, which roughens the surface and offers many active sites for enzyme loading. The electrostatic interaction between negatively charged enzyme and positively charged LPEI helps the enzyme firmly attach on the surface. The loading capacity of LPEI/PSS cordierite‐H was 1.24 mg g−1. Horseradish peroxidase (HRP)‐loaded LPEI/PSS cordierite‐H (HRP@LPEI/PSS cordierite‐H) exhibited activity recovery of 55.33%, 2‐fold higher than that of HRP‐loaded branched polyethyleneimine (BPEI)/PSS cordierite‐H (HRP@BPEI/PSS cordierite‐H) (23.72%). Furthermore, a silica layer was formed on the surface of HRP@LPEI/PSS cordierite‐H through LPEI‐induced silicification, which could prevent the enzyme from deactivation under extreme conditions. CONCLUSION These monolithic biocatalysts have great potential for applications in wastewater treatment and even in other fields such as pharmaceutical synthesis. © 2019 Society of Chemical Industry

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“…Combined with the single Si 2p peak at 102.37 eV, it can be then conjectured that silica was mineralized on the surface of LPEI (Fig. (d)) …”

Section: Resultsmentioning

confidence: 98%

Section: Preparation and Characterization Of Monolithic Scaffoldsmentioning

confidence: 99%

Bioinspired synthesis of nanofibers on monolithic scaffolds for enzyme immobilization with enhanced loading capacity and activity recovery

Shi

Zhao

et al. 2019

J of Chemical Tech & Biotech

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“…However, for PAN-TA NFs, the intensity of C-O/C-N/C≡N bonds was further strengthened due to the polyphenol groups which belong to tannic acid. For crosslinked PAN-TA NFs (Figure 5d), the peak at 286.7 eV of C-O and C=N bonds appeared [46], which is attributed to a crosslinking reaction between TA and polyacrylonitrile by glutaraldehyde. These phenomena further indicate that the PAN was successfully modified by tannin.…”

Section: Composition Characterizationmentioning

confidence: 98%

“…A comparison of the adsorption capacity of PAN-TA-3 NFs to some other tannin-based adsorbers is presented in Table 3 [1,46,[48][49][50]. It can be seen that PAN-TA-3 nanofiber adsorbent has a relatively high adsorption capacity for Cr(III) compared to other tannin-based adsorbents, while lower than tannin-based adsorbents for Cr(VI).…”

Section: Adsorption Cyclesmentioning

confidence: 98%

Fabrication of PAN Electrospun Nanofibers Modified by Tannin for Effective Removal of Trace Cr(III) in Organic Complex from Wastewater

Zhang

Xue

et al. 2020

Polymers

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Removal of chromium ions is significant due to their toxicity and harmfulness, however it is very difficult to remove trace Cr(III) complexed with organics because of their strong stability. Herein, a novel electrospun polyacrylonitrile (PAN) nanofibers (NF) adsorbent was fabricated and modified by tannic acid (TA) by a facile blend electrospinning approach for removal of trace Cr(III) in an organic complex. Utilizing the large specific area of nanofibers in the membrane and the good affinity of tannic acid on the nanofibers for hydrolyzed collagen by hydrophobic and hydrogen bonds, the as-prepared PAN–TA NFM exhibited good adsorption toward Cr(III)-collagen complexes and effective reduction of total organic carbon in tannage wastewater. The maximal adsorption capacity of Cr(III) is 79.48 mg g−1 which was obtained at the pH of 7.0 and initial Cr(III) concentration of 50 mg g−1. Importantly, the batch adsorption could decrease the Cr(III) concentration from 10–20 mg L−1 to under 1.5 mg L−1, which showed great application potential for the disposal of trace metal ions in organic complexes from wastewater.

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“…Based on Figure 1, TA: PEI ratio of 1:2 and 1:3 shows the highest percentage removal of aspirin which is 65% for both compared to 55% for the equal amount of TA and PEI with the ratio of 1:1. It can be seen that PEI added increased the removal ability as it works as the surfactant on the TA which contained a massive amount of nitrogen-containing functional group and its abundant functional groups improved the adsorption properties of the supporting material [10].…”

Section: A Effect Of Ta To Pei Ratiomentioning

confidence: 99%

Synthesis of Modified Spent Tea for Aspirin Adsorption in Aqueous Solution

Rosli¹,

Ngadi²,

Azman³

2019

IJRTE

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This present study focuses on the synthesis of a new modified eco-friendly adsorbent, spent tea (ST, discarded Camellia sinensis leaves), and its application in the adsorption of Aspirin from aqueous solution by batch adsorption technique. This is an effort in shifting towards new substitutes that are both inexpensive and highly efficient, such as agricultural waste materials as an alternative of the commonly used adsorbent material, activated carbon. The ST will first undergo an acid treatment using phosphoric acid, and subsequently modified with Polyethyleneimine (PEI) using Glutaraldehyde (GA) as the cross-linker. Aspirin removal efficiency was compared between the untreated spent tea (ST) and new PEI modified acid treated spent tea (TA-PEI). Effects of ratio of acid treated spent tea (TA) and PEI (1:1, 1:2,1:3, 2:1,3:1), and GA concentration (0,0.5,1.0,2.0,3.0, and 4.0 v/v%) were investigated. The optimal conditions for the synthesis of the modified adsorbent, TA-PEI are TA: PEI ratio of 1:2, and 0.5(v/v %) of GA. Afterwards, the untreated ST and TA-PEI were tested to determine the effect of contact time on Aspirin adsorption. It was found that TA-PEI shows great removal effectiveness - up to 64.70% before reaching equilibrium after 30min of contact time. Nevertheless, ST only shows removal of 1% and after 15min, there is no appreciable adsorption. These results suggested that TA-PEI has high potential to be used as an effective adsorbent for Aspirin removal. In the future, TA-PEI will undergo further research to investigate the effects of different adsorbent dosage, solution pH, initial concentration, solution temperature, and contact time. Several analysis (FTIR, SEM, CHNS, BET and point of zero charge) has to be done as well to get a better understanding of its properties and the adsorption mechanisms

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Facile preparation of polyethylenimine-tannins coated SiO2 hybrid materials for Cu2+ removal

Cited by 168 publications

References 64 publications

Bioinspired synthesis of nanofibers on monolithic scaffolds for enzyme immobilization with enhanced loading capacity and activity recovery

Bioinspired synthesis of nanofibers on monolithic scaffolds for enzyme immobilization with enhanced loading capacity and activity recovery

Fabrication of PAN Electrospun Nanofibers Modified by Tannin for Effective Removal of Trace Cr(III) in Organic Complex from Wastewater

Synthesis of Modified Spent Tea for Aspirin Adsorption in Aqueous Solution

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