Enhanced Cr(VI) removal by polyethylenimine- and phosphorus-codoped hierarchical porous carbons

Chen, Shixia; Wang, Jun; Wu, Zeliang; Deng, Qiang; Tu, Wenfeng; Dai, Gui-Ping; Zeng, Zheling; Deng, Shuguang

doi:10.1016/j.jcis.2018.03.057

Cited by 100 publications

(50 citation statements)

References 54 publications

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“…Two small bands at 2925 and 2850 cm À1 were attributed to C-H stretching vibrations, and the absorption at 1580 cm À1 was assigned to C]C vibration. Moreover, the bands at around 1633, 1405 and 1000-1200 cm À1 were attributed to C]O, C-P and C-O vibrations respectively, 28 revealing the presence of oxygen and phosphorus functionalities on the activated carbons, consistent with the elemental analysis results.…”

Section: + H 2 O ¼ Co + Hsupporting

confidence: 84%

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Activated carbons derived from hydrothermal impregnation of sucrose with phosphoric acid: remarkable adsorbents for sulfamethoxazole removal

et al. 2019

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Section: + H 2 O ¼ Co + Hsupporting

confidence: 84%

“…S5d †) demonstrated two main signals around 132 and 134 eV, representing phosphorus in the carbon matrix (P-C) and C-O-P functionalities (P-O). 28,39 The relative amount of O-1 and O-2 groups changed aer adsorption. On one hand, extra oxygen introduced through the adsorption of SMX triggered some change.…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Activated carbons derived from hydrothermal impregnation of sucrose with phosphoric acid: remarkable adsorbents for sulfamethoxazole removal

et al. 2019

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“…Adsorption kinetics are utilized to further understand the adsorption process of Cu 2+ onto such hydrogel, which is of great importance to the exploration of adsorption mechanism and potential applications. The kinetic models like pseudo first order (Equation ), pseudo second order (Equation ), and Weber–Morries intraparticle diffusion model (Equation ) are applied to study the kinetic mechanism.

\lg ((), Q_{e} - Q_{t}) = \lg Q_{e} - \frac{k_{1}}{2.303} t

\frac{t}{Q_{normalt}} = \frac{t}{Q_{normale}} + \frac{1}{k^{2} {Q_{normale}}_{2}}

Q_{t} = k_{id} t^{1 / 2} + C

where t (hr) is the adsorption time; Q e (mg/g) and Q t (mg/g) represent a uptake capacity at equilibrium and at time t , respectively. k 1 (1/h) and k 2 (g mg −1 h −1 ]) refer to pseudo‐first‐order rate constant and pseudo‐second‐order rate constant, respectively.…”

Section: Resultsmentioning

confidence: 99%

Polymer hydrogel cross‐linked by inorganic nanoparticles for removing trace metal ions

Lv¹,

Shen³

et al. 2020

J of Applied Polymer Sci

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Hydrogels for absorbing metal ions in wastewater have attracted more attentions in the environmental field especially for recent years. The removal efficiency of hydrogel adsorbents for eliminating metal ions is highly related with the effective contact between adsorbents and adsorbates. However, poor water absorption capacity of the hydrogel adsorbents would restrict on the expose of adsorption sites to the targeted subjects, causing undesirable removal ratio (RR) especially for metal ions at trace level. Thereby, the reported hydrogel adsorbents mainly focus on the removal of high content but not the trace level of metal ions so far. In this work, poly(acrylamide) (PAM)/poly(acrylic acid) (PAA)/Ca(OH)2 composite hydrogel is applied to adsorb trace metal ions. Swelling ratio of such PAM/PAA/Ca(OH)2 gel reaches 2,530 g/g, resulting in effective exposure of active sites and further expected RR for trace metal ions. The RRs of such adsorbent for Cu2+ (initial concentration C0 = 0.064 mg/L), Al3+ (C0 = 0.27 mg/L), Co2+ (C0 = 0.59 mg/L), Cr6+ (C0 = 0.52 mg/L), Mn2+ (C0 = 0.55 mg/L), Ni2+ (C0 = 0.59 mg/L), Zn2+ (C0 = 0.65 mg/L), Ag+ (C0 = 1.08 mg/L), and La3+ (C0 = 1.39 mg/L) are 56.6, 80.8, 41.3, 29.3, 34.6, 44.6, 55.9, 45.8, and 35.5%, respectively. This work broadens the application of hydrogel adsorbent for eliminating trace metal ions from polluted water.

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“…The bands appearing between 2800 cm -1 and 3000 cm -1 were attributed to the vibrations of the C-H groups (Hu et al 2020). The band appearing at 1565 cm -1 was attributed to the vibration of C=O in carboxyl groups (Chen et al 2018b). For the PEI, the bands appearing at 1585 cm -1 and 1450 cm -1 were attributed to the vibrations of N-H and C-N, respectively.…”

Section: Regeneration Of the Used Pei-ccmmentioning

confidence: 99%

Simultaneous removal of methyl orange and Cr(VI) using polyethyleneimine-modified corncob-derived carbon material

Liu

Wang

Zhou

et al. 2020

BioRes

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Polyethyleneimine (PEI) modified corncob-derived carbon material (CCM) was prepared by the simple wet-impregnation technique. Field emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), Fourier-transform infrared spectroscopy (FT-IR), and nitrogen isothermal adsorption/desorption measurements were used to compare the structural differences between the CCM and the PEI-modified CCM (PEI-CCM). In the single-pollutant removal experiment, the PEI-CCM showed high adsorption capacities for methyl orange (MO) and Cr(VI). However, the CCM only showed high adsorption capacity for MO. Moreover, the PEI-CCM exhibited high removal efficiencies in the simultaneous removal of MO and Cr(VI), with final removal efficiencies of 100% and 95%, respectively. The reusability experiment of PEI-CCM indicated that, after four recycles, PEI-CCM maintained high performance with the removal efficiency of MO and Cr(VI) decreased less than 3% and 16%, respectively. The prepared PEI-CCM could be a high-performance adsorbent for the simultaneous removal of MO and Cr(VI) from water containing multiple pollutants.

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Enhanced Cr(VI) removal by polyethylenimine- and phosphorus-codoped hierarchical porous carbons

Cited by 100 publications

References 54 publications

Activated carbons derived from hydrothermal impregnation of sucrose with phosphoric acid: remarkable adsorbents for sulfamethoxazole removal

Activated carbons derived from hydrothermal impregnation of sucrose with phosphoric acid: remarkable adsorbents for sulfamethoxazole removal

Polymer hydrogel cross‐linked by inorganic nanoparticles for removing trace metal ions

Simultaneous removal of methyl orange and Cr(VI) using polyethyleneimine-modified corncob-derived carbon material

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