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Modification of epoxy groups of poly(hydroxylmethyl methacrylate-co-glycidyl methacrylate) cryogel with H3PO4 as adsorbent for removal of hazardous pollutants

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Abstract

Poly(hydroxylmethyl methacrylate-co-glycidyl methacrylate) (p(HEMA-GMA)) macroporous cryogel with high density of epoxy groups was synthesized, and the epoxy groups of the cryogel were modified into phosphonate groups. The effects of dye concentrations, adsorption time, pH, salt concentration, and adsorption temperature on the adsorption of Direct Blue-53 (DB-53) and Reactive Blue-160 (RB-160) dyes were studied. The maximum adsorption capacity was found to be 245.3 and 155.8 mg/g (0.255 or 0.119 mmol/g) for the DB-53 and RB-160 dyes, respectively. The higher adsorption capacity achieved for the DB-53 compared with the RB-160 dye can result from the pendant primary amino groups of the DB-53 dye as well as the smaller size of the dye molecule. The Langmuir isotherm model and the pseudo-second-order kinetic model well described the experimental data. The p(HEMA-GMA)-PO42− adsorbent has many operational advantages for the removal of pollutants. It could be a promising adsorbent to be used in industrial wastewater treatment.

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Abbreviations

A :

differential surface capacity for dye adsorption (mg/g)

b T :

Temkin constant (equilibrium binding constant; mL/g)

C 0 :

initial concentration of dye (mg/L)

C e :

equilibrium dye concentration (mg/L)

C t :

dye concentration after time t (min)

E a :

activation energy (kJ/mol)

h :

initial adsorption rate (mg/g/min)

k 1 :

first-order rate constant (min−1)

k 2 :

second-order rate constant (g/mg/min)

K a :

association constant of the solute/surface interaction

K F :

Freundlich constant for adsorption capacity

n :

Freundlich constant related to adsorption intensity or surface heterogeneity

q :

amount of dye adsorbed at time t (mg/g)

q exp :

experimental adsorption capacity (mg/g)

q max :

maximum adsorption capacity (mg/g)

q eq :

theoretical or calculated adsorption capacity at equilibrium (mg/g)

q t :

adsorbed amount of dye at time t (mg/g)

R :

universal gas constant (kJ/mol K)

R L :

separation factor

T :

absolute temperature (K)

V :

volume of solution (L)

W :

weight of the adsorbent (g)

ΔG°:

Gibbs free energy (kJ/mol)

ΔH°:

enthalpy (kJ/mol) of adsorption

ΔS°:

entropy (J/mol K) of adsorption

Θ :

contact angle (°)

γ l :

surface tension of liquid (mN/m)

APS:

ammonium persulfate

DB-53:

Direct Blue-53

GMA:

glycidyl methacrylate

HEMA:

2-hydroxylmethyl methacrylate

MBA:

N,N′-methylenebisacrylamide

RB-160:

Reactive Blue

SDS:

sodium dodecylsulfate

TEMED:

N,N,N′,N′-tetramethylene diamine

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Correspondence to Gulay Bayramoglu.

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Responsible editor: Angeles Blanco

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Bayramoglu, G., Arica, M.Y. Modification of epoxy groups of poly(hydroxylmethyl methacrylate-co-glycidyl methacrylate) cryogel with H3PO4 as adsorbent for removal of hazardous pollutants. Environ Sci Pollut Res 27, 43340–43358 (2020). https://doi.org/10.1007/s11356-020-10170-y

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  • DOI: https://doi.org/10.1007/s11356-020-10170-y

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