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. 2019 May 29;9(6):814. doi: 10.3390/nano9060814

Table 5.

Recovery of REEs using Graphene oxide (GO) composites and the respectively experimental conditions used as reported in the literature.

Ref.,
Year		 Sorbent Type of Water Type of System REEs (III) [REEs]0
(µg/L)		 pH T (°C) Time of Contact (h) m(Sorbent)/
V(Solution) (mg/L)		 qm (mg/g) or
REEs Adsorption (%)
[94],
2017		 GO colloid Ultrapure Multi elements La, Nd, Gd, Y 5 × 103 6 r.t. 0.5 10 × 102 La = 85.7 mg/g
Nd = 189 mg/g
Gd = 226 mg/g
Y = 136 mg/g
[95],
2017		 GO colloid Ultrapure Multi elements La, Nd, Gd, Y (5–50)
103 		3-8 5–45 0.02–2 10 × 102
[91],
2015		 GO Ultrapure Mono element Eu 10 × 103
NaClO4 = 0.01 mol/L		 4.5,
7		 20 0–24 10 × 102 90%,
89.7 mg/g
[92],
2015		 MGO Ultrapure Mono element Eu 10 × 103
NaClO4 = 0.01 mol/L		 4.5,
7		 20 0–24 10 × 102 80%,
70.2 mg/g
[92],
2015		 GO e MGO Ultrapure Mono element Eu (1–50)
×103 		2–11 20, 40, 60 0–24 10 × 102
[101],
2012		 GONS Ultrapure Mono element Eu (1) 51 × 103
NaClO4 = 0.01 mol/L		 2
4.5
6
7		 25 48 2 × 102 65%, 167.16 mg/g
161.29 mg/g
175.44 mg/g
100%
[101],
2012		 GONS Ultrapure Mono element Eu 51 × 103
NaClO4 = 0.01 mol/L		 2–11 25, 45, 65 48 2 × 102
[100],
2016		 GO Ultrapure Mono element Eu 10 × 103
NaCl = 0.1, 0.01, 0.001 mol/L		 5.5 20 0–24 5 × 102 100%, 143 mg/g
[100],
2016		 GO-OSO3H Ultrapure Mono element Eu 10 × 103
NaCl = 0.1, 0.01, 0.001 mol/L		 5.5 20 0–24 5 × 102 90%, 125 mg/g
[100],
2016		 GO e GO-OSO3H Ultrapure Mono element Eu 10 × 103
NaCl = 0.1, 0.01, 0.001 mol/L		 1–11 20 0–24 5 × 102
[92],
2014		 GO colloid Ultrapure Mono element Gd 12 × 103 5.9
(2–11)		 30 0.5 0.4 × 102 287 mg/g
[93],
2014		 GO colloid Ultrapure Mono element Y 12 × 103 5.9 30, 40 0.42 0.4 × 102 190 mg/g
[99],
2016		 GO Ultrapure Mono element Eu 0.01 × 103
NaCl = 0.01M		 5.0,
2.7–7.3		 r.t. 48 1 × 102 78.0 mg/g,
97%
[99],
2016		 GO Ultrapure Mono element Eu (0.01–100) × 103 1–8
2,4,6		 r.t. 48 1 × 102
[98],
2017		 GO Ultrapure Mono element Sc 300 × 103 2
4		 r.t. 4 50 × 102 ~ 95%, 36.5 mg/g
39.7 mg/g
[98],
2017		 GO Ultrapure Mono element Sc (1–300) × 103 1–5.5 r.t. 0.02–0.5 50 × 102
[96],
2017		 30%Mo4W8@EDMG,
30%Mo2W10@EDMG		 Ultrapure Mono element Ce 10 × 103 6
(2–6)		 20 0.08–3 17 × 102 90.9 mg/g,
96.2 mg/g
[95],
2014		 MPANI-GO Ultrapure Multi elements Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu 0.01 × 103 4 r.t. 0.33 4 × 102 Y = 8.10, La = 15.5, Ce = 8.60, Pr = 11.1, Nd = 8.50, Sm = 7.70, Eu = 11.0, Gd = 16.3, Tb = 11.8, Dy = 16.0, Ho = 8.10, Er = 15.2, Tm = 10.4, Yb = 10.3, Lu = 14.9 mg/g
[96],
2014		 MPANI-GO Ultrapure Multi elements Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu (0.00025, 0.0005, 0.001, 0.002, 0.01)
× 103 		2–9 r.t. 0.02–0.25, 0.33 (0.25–20) × 102
[90],
2013		 PANI@GO HClO4 (aq) 0.01 mol/L Mono element Eu 15 × 103 3 25 48 2.5 × 102 251 mg/g
[97],
2017		 TGA/CdTeQDs/Fe3O4/rGONS Distilled Mono element Ce 0.05 × 103
(1–100) × 103 		5.0 35 0.17 7 × 102 95%
56.8 mg/g
[102],
2017		 TGA/CdTeQDs/Fe3O4/rGONS Distilled Mono element Ce (1–100) × 103 2-8 35 0.02–0.25 (2–9) × 102
[102],
2014		 GTiP-1 Ultrapure Mono element Eu 100 × 103 1
3.7
5.5
7.3		 25 2 10 × 102 ~ 3.0%
~ 32%
35%
~ 72%
[103],
2014		 GTiP-2 Ultrapure Mono element Eu 100 × 103 1
3.7
5.5
7.3		 25 2 10 × 102 ~ 10%
~ 45%
50%
~ 80%
[103],
2014		 GO Ultrapure Mono element Eu 100 × 103 1
3.7
5.5
7.3		 25 2 10 × 102 ~ 7.0%
~ 20%
20%
~ 28%
[103],
2014		 GO, GTiP-1, GTiP-2 Ultrapure Mono element Eu (5–200) × 103
Na+ = 1, 10, 100, 1000 mM		 1.7, 3.7, 5.5, 7.3 25 2, 4 10,000 × 102

(1) Adsorptions experiments were conducted under N2 conditions. r.t. means room temperature. The ultrapure water was provided by Milli-Q system. Note that the optimal experimental conditions are represented by shading and the other conditions tested and described in the papers are represented on a white background (without shading).