Removal of uranium(VI) from aqueous solution using graphene oxide functionalized with diethylenetriaminepentaacetic phenylenediamine

Figures & data

Figure 1. Synthesis of DTPAA.

Figure 2. FTIR spectra of GO, DTPAA, GO-DTPAA, and GO-DTPAA-U.

Figure 3. XPS spectra of (a) total survey scan, (b) C 1 s of GO-DTPAA, (c) O1s of GO-DTPAA, (d) N 1 s of GO-DTPAA, and (e) U 4f of GO-DTPAA-U.

Table 1. Composition of GO, GO-DTPAA, and GO-DTPAA-U

	Atomic percent(%)				Atomic ratio
Prepared materials	C	O	N	U	N/C	O/C
GO	66.71	33.29	0	0	0	0.499
GO-DTPAA	73.09	21.98	4.93	0	0.068	0.301
GO-DTPAA-U	65.28	29.06	3.43	2.24	0.053	0.445

Figure 4. XRD patterns of GO and GO-DTPAA.

Figure 5. SEM images of (a) GO-DTPAA adsorbed uranium and (b) the EDS image of GO-DTPAA adsorbed with U(VI).

Figure 6. Raman spectra of GO and GO-DTPAA.

Figure 7. Effects of pH on U(VI) adsorption onto GO and GO-DTPAA. (C[U(VI)] = 50 mg·L⁻¹ and T = 25 °C).

Figure 8. Effects of time on U(VI) adsorption onto GO and GO-DTPAA. (C[U(VI)] = 50 mg·L^−1, pH = 6.5 and T = 25 °C).

Figure 9. Effects of initial U(VI) concentration on U(VI) adsorption onto GO and GO-DTPAA. (pH = 6.5 and T = 25 °C).

Table 2. Adsorption kinetic parameters of uranium by GO and GO-DTPAA

		Value
Model	Parameter	GO	GO-DTPAA
	qe, exp (mg·g^−1)	97.31	439.42
Pseudo-first-order kinetic model	q1, cal (mg·g^−1)	84.35	298.65
	k1 (min^−1)	0.1562	0.016
	R^2	0.9303	0.9881
Pseudo-second-order kinetic model	q2, cal (mg·g^−1)	100.5	476.19
	k2 (g·mg^−1·min^−1)	1.00 × 10^−2	7.37 × 10^−4
	R^2	0.9907	0.9977

Table 3. Langmuir, Freundlich, and D–R isotherm parameters of pristine GO and GO-DTPAA

		Value
Model	Parameter	Pristine GO	GO-DTPAA
Langmuir	qm (mg·g^−1)	122.4	485.0
	KL (L·g^−1)	0.1172	0.9718
	R^2	0.9966	0.9950
Freundlich	Kf (mg·g^−1)	23.35	208.82
	n	2.49	4.02
	R^2	0.9225	0.9075
D–R	β (mol^2·KJ^−2)	0.00341	0.00302
	E (KJ·mol^−1)	12.11	12.87
	qm (mg·g^−1)	98.0	470.3
	R^2	0.9313	0.9809

Figure 10. Plot of lnK_d vs. 1/T for the adsorption of U(VI) onto GO and GO-DTPAA.

Table 4. Thermodynamic parameters for U(VI) adsorption onto GO and GO-DTPAA

			ΔG^0 (kJ·mol^−1)
Adsorbents	ΔH^0 (kJ·mol^−1)	ΔS^0 (J·mol^−1·K^−1)	303(K)	313(K)	323(K)
GO	7.91	36.93	−3.29	−3.66	−4.02
GO-DTPAA	56.8	222.70	−10.71	−12.94	−15.17

Table 5. Comparison of U(VI) adsorption capacity by different sorbents

Adsorbents	Experimental conditions	qmax(mg·g^−1)	Ref.
GO−NH2	pH = 5.5, T = 298 K	215.2	[16]
AMGO	pH = 5.9, T = 293 K	141.2	[18]
GO@LDH	pH = 4.5, T = 293 K	160	[50]
GONF	pH = 3.5, T = 293 K	135.13	[51]
GO−BSA	pH = 6.0, T = 298 K	389	[52]
HO−CB[6]/GO	pH = 5.0, T = 298 K	301.6	[53]
GO−DTPAA	pH = 6.5, T = 298 K	485.0	This work

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