Study of heavy metal ion absorbance by amidoxime group introduced to cellulose‐graft‐polyacrylonitrile

El‐Khouly, A. S.; Takahashi, Yoshiaki; Saafan, A. A.; Kenawy, El‐Refaie; Hafiz, Y. A.

doi:10.1002/app.33135

Cited by 40 publications

(22 citation statements)

References 35 publications

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“…All the isotherm parameters are listed in Table 2, which reects that the Langmuir isotherm can t the experimental data well with a higher R 2 value (>0.99), favorable R L (0.1534-0.7435) and reasonable Langmuir constant (k L > 0). When compared with the representative studies on the adsorbents containing amidoxime and/or hydroxamic acid functional groups (Table S1, ESI †), 17,32,35,36,[43][44][45][46] pAHA-cellulose shows an increased adsorption capacity for almost all the metal ions studied. This improved adsorption ability can be due to the coexistence of the amidoxime and hydroxamic acid functional groups, conrming the possible chelation mechanism.…”

Section: 42mentioning

confidence: 99%

Synthesis of a poly(amidoxime-hydroxamic acid) cellulose derivative and its application in heavy metal ion removal

et al. 2017

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Amidoxime and hydroxamic acid functional groups have comparable chelating ability with synthetic resins, but the synthesis of cellulose fibers bearing amidoxime and hydroxamic acid functional groups using simple and effective strategies have yet to be developed. In this study, a poly(amidoxime-hydroxamic acid) cellulose derivative (pAHA-cellulose) was prepared via free radical polymerization followed by an oximation reaction. A series of microscopic analyses and spectral tests proved that the pAHA-cellulose was covered with uniform amidoxime and hydroxamic acid functional groups. The use of pAHAcellulose towards heavy metal ion removal was investigated and an uptake equilibrium was achieved within 60 min for Cu 2+ and Zn 2+ , and 120 min for Pb 2+ and Cr 3+, through a chelation mechanism. The adsorption behavior followed the pseudo-second-order kinetic model and Langmuir isotherm with and Zn 2+ , respectively. Regeneration of pAHA-cellulose did not significantly influence the adsorption towards metal ions for up to five sequential cycles. Considering the simple and efficient grafting process, excellent adsorbability and prominent renewability, pAHA-cellulose is believed to be a new and feasible candidate for heavy metal ion removal from aqueous solution.

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Section: 42mentioning

confidence: 99%

Synthesis of a poly(amidoxime-hydroxamic acid) cellulose derivative and its application in heavy metal ion removal

et al. 2017

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“…Meanwhile, the characteristic FT-IR peak at ~2240 cm −1 related to the vibration of −CN 20,23-25 is not detected, which proves the high conversion of PAN to PAO. 22,24 The functional groups on ZVI/PAO surface are also studied by XPS technique. The successful preparation of ZVI/PAO is confirmed by XPS survey spectrum in Figure 3A.…”

Section: Resultsmentioning

confidence: 99%

Zero valent iron/poly(amidoxime) adsorbent for the separation and reduction of U(vi)

Shao

Wang

et al. 2016

RSC Adv.

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Magnetic nanocomposite of zero valent iron (ZVI)/poly(amidoxime) (PAO) was prepared by polymerization of acrylonitrile on ZVI surface, followed by hydroxylamine (NH2OH) treatment to convert cyano group (-CN) into amidoxime group (AO). The characterization results showed that PAO stabilized ZVI magnetic composite (denoted as ZVI/PAO) was prepared successfully. ZVI/PAO was used as adsorbent for the separation of U(VI) from solutions. The effect of environmental conditions on U(VI) adsorption onto ZVI/PAO was studied in details. U(VI) adsorption on ZVI/PAO surface reached equilibrium within 3 h, and the adsorption process is well described by the pseudo−second−order kinetic model. Adsorption isotherms of U(VI) on ZVI/PAO surface can be well fitted by the Langmuir model, and the maximum adsorption capacity was calculated to be 206 mg/g at T=298 K and pH=5.0. Experimental results highlighted the application of ZVI/PAO as adsorbent for the efficient separation of U(VI) and reduction of U(VI) to U(IV) from aqueous solutions.

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“…[54][55][56][57][58][59] Polymer brushes possess a myriad of functional groups in every grafted polymer chain, permitting easy capture of large amounts of heavy metal ions. The polymer brush grafted GO was created using surface-initiated atom transfer radical polymerization (SI-ATRP) in three steps.…”

Section: Introductionmentioning

confidence: 99%

“…The AO group was used to chelate toxic ions because of its high binding affinity toward heavy metal ions. [54][55][56][57][58][59] Polymer brushes possess a myriad of functional groups in every grafted polymer chain, permitting easy capture of large amounts of heavy metal ions. Therefore, the PAO brush grafted GO demonstrated excellent adsorption performance.…”

Section: Introductionmentioning

confidence: 99%

Polymer brushes on graphene oxide for efficient adsorption of heavy metal ions from water

Liu

Ding

Chi

et al. 2019

J of Applied Polymer Sci

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The pollution of heavy metal ions in water poses a serious threat to human being and ecosystems. Here, we report polyamidoxime (PAO) brush grafted graphene oxide (GO) as a highly efficient adsorbent for extraction of toxic metal cations from water. Surface-initiated atom transfer radical polymerization was used to grow polyacrylonitrile (PAN) brushes on GO, followed by conversion of the nitrile groups in PAN into amidoxime groups, which had high binding affinity toward heavy metal cations. The PAO brush grafted GO demonstrated significantly fast adsorption kinetics and large adsorption capacity. At optimal pH 5, the PAO brush grafted GO can achieve maximum adsorption capacities of 116.7 mg g −1 for Pb(II), 258.6 mg g −1 for Ag(I), 192.2 mg g −1 for Cu(II), and 167.9 mg g −1 for Fe(III), which were significantly larger than those of small molecule functionalized GO. Mechanism analysis suggested that the enhanced adsorption performance was due to the myriads of functional groups in PAO brushes that were easily accessible to metal ions because of the swelling of the polymer brushes in water.

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Study of heavy metal ion absorbance by amidoxime group introduced to cellulose‐graft‐polyacrylonitrile

Cited by 40 publications

References 35 publications

Synthesis of a poly(amidoxime-hydroxamic acid) cellulose derivative and its application in heavy metal ion removal

Synthesis of a poly(amidoxime-hydroxamic acid) cellulose derivative and its application in heavy metal ion removal

Zero valent iron/poly(amidoxime) adsorbent for the separation and reduction of U(vi)

Polymer brushes on graphene oxide for efficient adsorption of heavy metal ions from water

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