Ambient aqueous-phase synthesis of covalent organic frameworks for degradation of organic pollutants

Article abstract of DOI:10.1039/c9sc03725j

The development of a mild, low cost and green synthetic route for covalent organic frameworks (COFs) is highly desirable in order to open the door for practical uses of this new family of crystalline porous solids. Herein, we report a general and facile strategy to prepare a series of microporous or mesoporous COFs by a β-ketoenamine based Michael addition-elimination reaction in aqueous systems at ambient temperature and pressure. This synthesis method not only produces highly crystalline and porous COFs, but also can be carried out with a high reaction rate (only 30 min), high yields (as high as 93%) and large-scale preparation (up to 5.0 g). Furthermore, an Fe(ii)-doped COF shows impressive performance in the oxidative degradation of organic pollutants in aqueous medium. This research thus provides a promising pathway to large-scale green preparation of COFs and their potential application in environmental remediation.

Full text of DOI:10.1039/c9sc03725j

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Ambient aqueous-phase synthesis of covalent
organic frameworks for degradation of organic
pollutants†
Cite this: Chem. Sci., 2019, 10, 10815
All publication charges for this article
have been paid for by the Royal Society
of Chemistry
Yaozu Liu,‡a Yujie Wang,‡a Hui Li,a Xinyu Guan,a Liangkui Zhu,a Ming Xue,a
b
a
*
Yushan Yan,
Valentin Valtchev,ac Shilun Qiua and Qianrong Fang
The development of a mild, low cost and green synthetic route for covalent organic frameworks (COFs) is
highly desirable in order to open the door for practical uses of this new family of crystalline porous solids.
Herein, we report a general and facile strategy to prepare a series of microporous or mesoporous COFs by
a
b-ketoenamine based Michael addition–elimination reaction in aqueous systems at ambient
temperature and pressure. This synthesis method not only produces highly crystalline and porous
COFs, but also can be carried out with a high reaction rate (only 30 min), high yields (as high as 93%)
and large-scale preparation (up to 5.0 g). Furthermore, an Fe(II)-doped COF shows impressive
performance in the oxidative degradation of organic pollutants in aqueous medium. This research thus
provides a promising pathway to large-scale green preparation of COFs and their potential application
in environmental remediation.
Received 29th July 2019
Accepted 15th October 2019
DOI: 10.1039/c9sc03725j
rsc.li/chemical-science
solvothermal synthesis, which is implemented in sealed tubes
with raising temperatures and pressures, and needs compli-
Introduction
cated operations and high energy expenditure. Green synthesis
using mild reaction conditions and nontoxic precursors, as
a reliable, sustainable and eco-friendly protocol, has attracted
extensive attention for reducing destructive effects related to
traditional methods in the laboratory and industry.13 We have
exploited a fast, ambient temperature and pressure ion-
othermal synthesis of COFs;14 however, the high cost of ionic
liquids hinders the application of this method for large-scale
preparation of COFs. Therefore, the development of a simple,
low cost and green synthetic strategy for COFs is still highly
benecial.15
Taking these considerations in mind, we herein report
a general and environmentally benign approach to construct
microporous and mesoporous COFs by a b-ketoenamine based
Michael addition–elimination reaction in aqueous systems
under ambient conditions. On the basis of this method, a series
of highly crystalline COFs with pore sizes from 1.59 to 2.92 nm,
denoted as JUC-520 (JUC ¼ Jilin University China), JUC-521,
JUC-522 and JUC-523, were successfully prepared. Notably,
JUC-521 can be obtained in a short period of time (about 30
min) with a high yield (>93%) and by large-scale preparation (up
to 5.0 g). Moreover, a metal-doped COF, JUC-521-Fe, shows
impressive performance in the degradation of toxic organic
pollutants in aqueous solution. To the best of our knowledge,
this study is the rst case of a b-ketoenamine based Michael
addition–elimination reaction as well as ambient aqueous-
phase synthesis of highly crystalline COF materials.
Covalent organic frameworks (COFs) as a new class of fasci-
nating crystalline porous materials are composed of light
elements, such as C, H, N, B and O, and connected by covalent
bonds.1 Due to their well-dened pore geometry, high surface
area, and tunable framework composition, COFs hold great
promise in a variety of potential applications, including gas
adsorption and separation,2 heterogeneous catalysis,3 opto-
electronic and electrical energy storage devices,4 and several
others.5 Over the past decade, COFs have been obtained by
limited reversible chemical reactions, typically the formation of
boroxine,1a boronate-ester,6 imine,7 imide,8 triazine,9 alkene10
and dioxin linkage.11 Recently, Perepichka and co-workers re-
ported novel 2D p-conjugated COFs as crystalline powders and
exfoliated micron-size sheets by using a new dynamic poly-
merization based on Michael addition–elimination reaction of
structurally diverse b-ketoenols with amines.12 Furthermore, the
classical synthesis of COFs so far is restricted to the
aState Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin
University, Changchun 130012, China. E-mail: qrfang@jlu.edu.cn
bDepartment of Chemical and Biomolecular Engineering, Center for Catalytic Science
and Technology, University of Delaware, Newark, DE 19716, USA
cNormandie Univ, ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et
Spectrochimie, 6 Marechal Juin, 14050 Caen, France
† Electronic supplementary information (ESI) available: Procedure for the
preparation of COFs, SEM images, FT-IR spectra, solid-state 13C NMR spectra,
TGA analysis, stability test, PXRD patterns and structures, unit cell parameters
and fractional atomic coordinates, and BET plots. See DOI: 10.1039/c9sc03725j
‡ These authors contributed equally.
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Typically, the syntheses were carried out by suspending
TDOEB and TAPT, TCTAB, DMB or DMOB in aqueous solution
with acetic acid as the catalyst, followed by keeping at ambient
temperature and pressure to produce crystalline solids. All COFs
can be synthesized within 8 h, which is substantially shorter than
those from the traditional solvothermal method (3–7 days). To
further explore the aqueous-phase synthesis of COFs, JUC-521
was selected as an example to study the inuence of different
reaction conditions including temperature, concentration of
catalysts, and reaction time (Fig. S1–S3, ESI†). Remarkably, highly
crystalline JUC-521 can be obtained at room temperature in 6 M
acetic acid aqueous solution within only 30 min, accompanied by
a high yield (93%). Moreover, scale-up synthesis of JUC-521 (ꢀ5.0
g) can be successfully performed by increasing the amount of
reactants and solvents (Fig. S4, ESI†). Thus, this simple, low cost
and scale-up green process suggests that mass production of
COFs can be achieved based on this reaction strategy.
The structural features of the new COFs were determined by
complementary methods. The crystal morphology was observed
by scanning electron microscopy (SEM). Relatively small
building complex aggregates (ca. 0.2 mm) are characteristic of all
samples (Fig. S5–S8, ESI†). Fourier transform infrared (FT-IR)
spectra displayed the disappearance of N–H stretching of the
primary amines (ꢀ3450 cmꢁ1) and N–CH3 stretching of TDOEB
(1438 cmꢁ1), which conrms that the reaction has taken place
Results and discussion
Our strategy for preparing COFs in ambient aqueous systems
involves the Michael addition–elimination reaction of b-
ketoenamines and aromatic amines. Scheme 1a shows the
mechanistic pathway of this reaction. The by-products of this
reversible process are organic amines, which can react with
acetic acid to form dimethylamine acetate and a small amount
of dimethylacetamide (DMAC, Section S1.11, ESI†). Thus, these
by-products can accelerate the reaction to generate high quality
COF materials. Based on this strategy, the model reaction is
implemented between 3-(dimethylamino)-1-phenyl-2-propen-1-
one (DPPO) and benzenamine (BA) to form 3-anilino-1-phenyl-
2-propen-1-one (APPO) and
a by-product, dimethylamine
(DMA, Scheme 1b). In pursuit of COFs, 1,3,5-tris(3-
dimethylamino-1-oxoprop-2-en-yl)benzene (TDOEB) is chosen
as a C3-symmetric b-ketoenamine-based node. Thus, the
condensation of TDOEB and two other C3-symmetric knots,
1,3,5-tris(4-aminophenyl)triazine (TAPT) and 1,3,5-tricarboxylic
acid-tris(4-amino-phenyl-amide)benzene (TCTAB), or two C2-
symmetric linkers, 2,5-dimethyl-1,4-benzenediamine (DMB)
and 3,30-dimethoxybenzidine (DMOB), will give hexagonal
microporous JUC-520 (1.59 nm), JUC-521 (1.92 nm) and JUC-522
(1.98 nm) as well as mesoporous JUC-523 (2.92 nm), respectively
(Scheme 1c).
Scheme 1 Strategy for ambient aqueous-phase synthesis of COFs. (a) Mechanistic pathway of the Michael addition–elimination reaction of b-
ketoenamines and aromatic amines. (b) Model reaction between DPPO and BA to form APPO and DMA. (c) Condensation of TDOEB and TAPT,
TCTAB, DMB or DMOB to give JUC-520, JUC-521, JUC-522 or JUC-523 with different pores.
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(Fig. S9–S13, ESI†). The solid state 13C cross-polarization magic- the space group P6 (no. 168). The renement results show unit
angle-spinning (CP/MAS) NMR spectra further demonstrated cell parameters very close to the predictions with ideal agree-
that all COFs showed a characteristic signal at ꢀ145 ppm, cor- ment factors (uRp ¼ 3.63% and Rp ¼ 2.52% for JUC-520; uRp ¼
responding to the a-carbon of enamine (Fig. S14–S17, ESI†). 5.34% and Rp ¼ 3.92% for JUC-521; uRp ¼ 3.77% and Rp
¼
According to the thermogravimetric analysis (TGA, Fig. S18–S21, 2.45% for JUC-522; and uRp ¼ 3.91% and Rp ¼ 2.55% for JUC-
ESI†), these COFs are thermally stable up to 350 ꢂC. Their crys- 523). In contrast, simulated PXRD data of alternative stag-
talline structures can be preserved in a variety of organic solvents gered 2D arrangements (AB stacking) showed signicant devi-
as well as acidic (1.0 M HCl) and basic (1.0 M NaOH) aqueous ations compared with the experimental ones (Fig. S26–S37 and
solutions for 3 days (Fig. S22–S25, ESI†). In addition, a partial Tables S1–S8, ESI†). On the basis of these results, the obtained
loss of the PXRD signal intensity was also observed aer soaking COFs were proposed to have the expected frameworks with
in acidic and basic aqueous solutions, which could be attributed hexagonal micropores for JUC-520, JUC-521 and JUC-522 as well
to structural rearrangement induced by partial hydrolysis.
The unit cell parameters of COFs were resolved by using the
as mesopores for JUC-523 (Fig. 2).
The porosity and textural characteristics of the synthesized
powder X-ray diffraction (PXRD) patterns combined with series of COFs were determined by using nitrogen (N2)
structural simulations. Aer a geometrical energy minimization adsorption–desorption isotherms at 77 K. As shown in Fig. 3a–c,
by using the Materials Studio soware package,16 their unit cell a sharp gas uptake can be observed at low pressure (below
parameters based on the AA stacking boron nitride net (bnn) 0.05P/P0) for JUC-520, JUC-521 and JUC-522, which reveals their
ꢂ
˚
˚
were obtained (a ¼ b ¼ 22.4795 A, c ¼ 3.5114 A, a ¼ b ¼ 90 and microporous nature. JUC-523 showed a rapid uptake at a low
ꢂ
˚
˚
g ¼ 120 for JUC-520; a ¼ b ¼ 26.4476 A, c ¼ 3.5064 A, a ¼ b ¼ pressure of P/P0 < 0.05, followed by a second step between P/P0
ꢂ
ꢂ
˚
˚
90 and g ¼ 120 for JUC-521; a ¼ b ¼ 30.0949 A, c ¼ 3.5075 A, ¼ 0.1 and 0.2 (Fig. 3d), which is characteristic of mesoporous
ꢂ
ꢂ
˚
a ¼ b ¼ 90 and g ¼ 120 for JUC-522; and a ¼ b ¼ 36.9035 A, c ¼ materials. The Brunauer–Emmett–Teller (BET) surface areas of
3.5605 A, a ¼ b ¼ 90 and g ¼ 120 for JUC-523, respectively). these COFs are 976 m2 gꢁ1 for JUC-520, 1127 m2 gꢁ1 for JUC-521,
The experimental PXRD peaks were in good agreement with the 1182 m2 gꢁ1 for JUC-522, and 1435 m2 gꢁ1 for JUC-523 (Fig. S38–
simulated ones (Fig. 1). Full prole pattern matching (Pawley) S41, ESI†). These values are much higher than those of previous
renements were also applied. Peaks at 4.66, 8.07, 9.31, 12.38 COFs obtained via Michael addition–elimination of b-ketoenols
and 16.64ꢂ 2q for JUC-520 correspond to the (100), (110), (200), with amines (ꢀ500 m2 gꢁ1),12 which can be attributed to their
(120) and (130) Bragg peaks of the space group P6 (no. 174); high crystallinity. The total pore volume was calculated at P/P0 ¼
peaks at 3.87, 6.76, 7.89, 10.36, 13.56, 14.19 and 17.21ꢂ 2q for 0.9 to be 0.56 cm3 gꢁ1 for JUC-520, 0.67 cm3 gꢁ1 for JUC-521,
JUC-521 correspond to the (100), (110), (200), (210), (220), (310) 0.69 cm3 gꢁ1 for JUC-522, and 0.88 cm3 gꢁ1 for JUC-523. Their
and (230) Bragg peaks of the space group P6 (no. 174); peaks at pore-size distributions were estimated by using nonlocal
3.41, 6.07, 7.05 and 9.21ꢂ 2q for JUC-522 correspond to the (100), density functional theory (NLDFT), and showed narrow pore
(110), (200) and (210) Bragg peaks of the space group P6 (no. widths (1.53 nm for JUC-520, 1.87 nm for JUC-521, 1.95 nm for
168); and peaks at 2.77, 4.79, 5.57 and 7.31ꢂ 2q for JUC-523 JUC-522, and 2.88 nm for JUC-523, Fig. S42–S45, ESI†), which
correspond to the (100), (110), (200) and (210) Bragg peaks of are in good agreement with those from their crystal structures.
ꢂ
ꢂ
˚
Fig. 1 PXRD patterns of JUC-520 (a), JUC-521 (b), JUC-522 (c) and Fig. 2 Structural representations of JUC-520 (a), JUC-521 (b), JUC-
JUC-523 (d).
522 (c), and JUC-523 (d). C, green; H, gray; N, blue; O, red.
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Fig. 3 N2 adsorption–desorption isotherms of JUC-520 (a), JUC-521
(b), JUC-522 (c), and JUC-523 (d).
Encouraged by the high surface area and abundant b-
ketoenamine units, Fe(II)-loaded JUC-521 (JUC-521-Fe) was
subsequently acquired by immersing the pristine material in an
ethanol solution of FeSO4. The ferrous complexation of JUC-521
could be easily observed by the color change (Fig. S46, ESI†).
The energy dispersive X-ray spectroscopy (EDS) mapping image
showed the uniform distribution of Fe species in the crystals
(Fig. S47, ESI†). FT-IR spectroscopy revealed the strong chela-
tion interaction between b-ketoenamine units and Fe(II) ions
based on the shi of the IR bands for the carbonyl groups from
1662 to 1653 cmꢁ1 and amine bonds of enamine from 1221 to
1212 cmꢁ1 (Fig. S48, ESI†). The ICP analysis showed that most
of the b-ketoenamine units were coordinated to metal ions (see
Section S1, ESI†). The porosity of JUC-521-Fe was also evaluated
by N2 adsorption analysis, which pointed out that the adsorp-
tion capacity and pore size were slightly less than those of the
parent material (Fig. S49 and S50, ESI†). In addition, the PXRD
pattern of JUC-521-Fe indicated that the pristine framework was
preserved aer the metal incorporation (Fig. S51, ESI†).
We further explored the application of JUC-521-Fe in the
degradation of organic pollutants in aqueous medium based on
the Fenton reaction. It is well known that the Fenton reaction,
one of the most popular advanced oxidation processes (AOP),
involves an in situ generation of hydroxyl or peroxyl radicals (cOH
or HO2c) from hydrogen peroxide (H2O2) activated by ferrous
ions, to degrade hazardous organic compounds.17 However, the
traditional Fenton reaction was carried out with homogeneous
catalysts, which is strongly limited because of poor recyclability
and high energy consumption. Herein, we used JUC-521-Fe as
a heterogeneous Fenton catalyst for effective degradation of
organic pollutants due to its high surface area, chemical stability
and abundant catalytic sites. In addition, due to the large
channels in JUC-521-Fe, we expect to use this material for
adsorption and degradation of large toxic dyes, such as rhoda-
mine 6G (Rh6G), a famous toxic dye as a model substrate. As
shown in Fig. 4a, JUC-521-Fe showed a high catalytic perfor-
mance in the degradation of Rh6G with a reaction rate constant
Fig. 4 UV-vis spectra of Rh6G aqueous solution in the presence of
JUC-521-Fe/H2O2 (a), H2O2 (b), FeSO4/H2O2 (c) and JUC-521/H2O2
(d). (e) Comparison of the degradation abilities of Rh6G for different
materials. (f) Recyclability study of JUC-521-Fe.
of 2.8 ꢃ 10ꢁ2 minꢁ1 and a degradation efficiency of 95% in
90 min, which can be compared with those of the state-of-the-art
TiO2-based composites, such as TiO2 (ref. 18) with a reaction rate
constant of 8.9 ꢃ 10ꢁ3 minꢁ1 and a degradation efficiency of
63% in 180 min as well as nanosize TiO2 (ref. 19) with a reaction
rate constant of 1.3 ꢃ 10ꢁ2 minꢁ1 and a degradation efficiency of
98% in 180 min, and those of iron-based materials using
different porous supports, such as Fe2O3/active carbon bers20
with a reaction rate constant of 1.0 ꢃ 10ꢁ2 minꢁ1 and a degra-
dation efficiency of 90% in 120 min as well as SiO2/Fe3O4 shelled
hollow spheres21 with a reaction rate constant of 2.6 ꢃ
10ꢁ2 minꢁ1 and a degradation efficiency of 95% in 120 min.
Furthermore, H2O2, metal-free pristine material (JUC-521/H2O2)
and FeSO4/H2O2 were also tested under the same conditions.
Much lower degradation abilities for Rh6G were observed
(Fig. 4b–e), such as only 4% for H2O2, 19% for JUC-521/H2O2 and
21% for FeSO4/H2O2 at the same time. The SEM image and
PXRD pattern conrmed the retained crystallinity of JUC-521-Fe
aer the catalytic reaction (Fig. S52 and S53, ESI†). Furthermore,
ICP analysis revealed that almost no ferrous ions leached during
the degradation (see Section 1, ESI†). As a heterogeneous cata-
lyst, JUC-521-Fe can be isolated by centrifugation and reused at
least three times almost without loss of activity (Fig. 4f).
Conclusions
In conclusion, we have achieved a mild, low cost and green
process to prepare a number of microporous or mesoporous
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COFs by a b-ketoenamine based Michael addition–elimination
reaction under ambient synthesis conditions employing
aqueous systems. This strategy not only yields highly crystalline
and porous COFs, but also offers the advantage of a high reac-
tion rate (30 min), impressive yield (93%) and scalability
potential (5.0 g). Moreover, the metal-doped COF, JUC-521-Fe,
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degradation of toxic organic pollutants based on Fenton's
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Conflicts of interest
There are no conicts to declare.
Acknowledgements
This work was supported by the National Natural Science
Foundation of China (21571079, 21621001, 21390394,
21571076, and 21571078), the “111” project (B07016 and
B17020), and the Program for JLU Science and Technology
Innovative Research Team. V. V. and Q. F. acknowledge the
Thousand Talents program (China). V. V., Q. F. and S. Q.
acknowledge the collaboration in the framework of China-
French joint laboratory “Zeolites”.
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