Optimizing Fe-Based Metal-Organic Frameworks through Ligand Conformation Regulation for Efficient Dye Adsorption and C2H2/CO2 Separation

Article abstract of DOI:10.1002/chem.202101053

Regulating the structure of metal-organic frameworks (MOFs) by adjusting the ligands reasonably is expected to enhance the interaction of MOFs on special molecules/ions, which has significant application value for the selective adsorption of guest molecul

Full text of DOI:10.1002/chem.202101053

Accepted Article
Accepted Article
Title: Optimizing Fe-based Metal-Organic Frameworks through Ligand
Conformation Regulation for Efficient Dye Adsorption and C2H2/
CO2 Separation
Authors: Xiurong Zhang, Weidong Fan, Weifeng Jiang, Yue Li, Yutong
Wang, Mingyue Fu, and Daofeng Sun
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To be cited as: Chem. Eur. J. 10.1002/chem.202101053
Link to VoR: https://doi.org/10.1002/chem.202101053
01/2020

10.1002/chem.202101053
Chemistry - A European Journal
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Optimizing Fe-based Metal-Organic Frameworks through Ligand
Conformation Regulation for Efficient Dye Adsorption and
C2H2/CO2 Separation
Xiurong Zhang,+ Weidong Fan,+* Weifeng Jiang, Yue Li, Yutong Wang, Mingyue Fu and Daofeng Sun*
X. Zhang, W. Fan, W. Jiang, Y. Li, Y. Wang, M. Fu, Prof. D. Sun.
School of Materials Science and Engineering, College of Science, China University of Petroleum (East China), Qingdao, Shandong 266580, People’s Republic of
China.
NO. 66, Changjiang Road West, Qingdao, 266580 (PR China)
E-mail: weidongfan@163.com; dfsun@upc.edu.cn
+ Xiurong Zhang and Weidong Fan contributed equally.
Abstract: Regulating the structure of metal-organic frameworks
(MOFs) by adjusting the ligands reasonably is expected to enhance
the interaction of MOFs on special molecules/ions, which has
significant application value for the selective adsorption of guest
molecules. In this work, two tricarboxylic ligands H3L-Cl and H3L-NH2
were designed and synthesized based on the ligand H3TTCA by
replacing part of the benzene rings with C=C bonds and modifying the
chlorine and amino groups on the 4-position of the benzene ring. Two
3D Fe-MOFs (UPC-60-Cl and UPC-60-NH2) with the novel topology
types were constructed. As the C=C bonds of the ligands have flexible
torsion angles, UPC-60-Cl features three types of irregular 2D
channels, while UPC-60-NH2 has a cage with two types of windows
on the surface. The synergistic effect of unique channels and
modification of functional groups endows UPC-60-Cl and UPC-60-
NH2 with high adsorption capacity for organic dyes. UPC-60-Cl shows
high adsorption capacity for CV (147.2 mg g-1), RHB (100.3 mg g-1),
and MO (220.9 mg g-1), while UPC-60-NH2 exhibits selective
adsorption of MO (158.7 mg g-1). Meanwhile, based on the diverse
pore structure and modification of active sites, UPC-60-Cl and UPC-
60-NH2 show the selective separation of equimolar C2H2/CO2.
Therefore, reasonable regulation of organic ligands plays a significant
role in guiding the structure diversification and performance
improvement of MOFs.
the torsion angle of the central benzene ring in the ligand was
changed, and then the topologies of UPC-48-50 were
successfully adjusted to optimize the separation of specific
molecules/ions.[19]
Introduction
As a new porous material in the recent two decades, metal-
organic frameworks (MOFs) have a wide range of potential
applications in many fields (such as gas adsorption/separation,
catalysis, and fluorescence recognition) due to their various
structures and high specific surface area.[1-8] Compared with
traditional porous materials, one of the most attractive features of
MOFs is the tunability of their structure and pore environment. For
the specific molecules/ions like organic dyes and gases, the
structure and channel of MOFs can be precisely regulated by
controlling the shape and length of organic ligands to achieve the
selective adsorption of molecules with different sizes.[9-14] In
addition, by modifying flexible functional groups or introducing
groups with steric hindrance effects in specific positions of rigid
ligands, various conformations are expected to form during the
self-assembly process, which provides opportunities for obtaining
MOFs with novel structures.[15-18] In our previous work, by
modifying tetracarboxylic ligand H4DCBA with –CH3/–CF3 groups,
Figure 1. (a) The ligands H3L-Cl and H3L-NH2 which synthesized by
modification of H3TTCA with C=C bond, -Cl and -NH2 group. (b-e)
Conformations of the ligands in MOFs. (Blue plane: the relative plane of the
central phenyl rings. The atom C, O, N, and Cl are represented by gray, red,
blue, and green, respectively.)
Moreover, the pore environment can be optimized through
functional modification of metal nodes or organic ligands, thereby
enhancing the host-guest interaction and achieving the
separation of different molecules/ions with specific chemical
properties.[20-25] The modification of clusters or ligands has great
potential in removing pollutants such as dyes in wastewater. The
amount of textile dyes discharged globally each year far exceeds
the natural purification capacity, so there is an urgent to develop
1
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Figure 2. (a) The structure and simplified form of SBU and ligands. (b,c) The structure of UPC-60-Cl (b) and the three kinds of channels (c). (d,e) The structure of
UPC-60-NH2 (d) and the cage (e) which formed by 12 SBUs and 12 ligands. (H atoms are omitted for clarity.)
effective organic dye adsorbents.[26-28] In addition to the higher
specific surface area and porosity, the active sites such as –NH2
and -SH in the channel of MOFs also increase the interaction
(such as hydrogen bonding interaction, π–π interaction, etc.)
between the framework and the dye molecule.[29-32] With the
Results and Discussion
discovery of a series of water-stable MOFs, they are gradually
used to remove toxic organic dyes in water.[33-35] At the same time,
Crystal structures of UPC-60-Cl and UPC-60-NH2
the optimized pore environment is also of great application value
Single crystal X-ray diffraction (SCXRD) revealed that UPC-60-Cl
to the separation and purification of light hydrocarbon gas in the
crystallizes in the tetragonal space group P43212. Each Fe3+ is
petrochemical industry.[36,37] For instance, C2H2 produced from
connected to a μ3-O atom, a water molecule, and four O atoms
from different L-Cl3- ligands. Three Fe3+ are connected through μ3-
O atom and coordinate with six different ligands to form a classic
[Fe3O(COO)6(H2O)3] cluster. The asymmetric unit of UPC-60-Cl
contains one and a half crystallographically independent Fe(III)
atoms, a deprotonated L-Cl3- ligand, a half μ3-O atom, and one
and a half H2O molecules. Compared with UPC-200(Fe)-H-H2O
hydrocarbon pyrolysis is usually mixed with impurity gases such
as CO2, but their similar physical properties make it difficult to
separate by conventional separation techniques (such as
cryogenic distillation, liquid adsorption, etc.) with large energy
consumption and low efficiency. MOFs are used as adsorbents
for gas separation represents an energy-efficient and
environmentally friendly separation technology due to their
constructed by the rigid ligand H3TTCA and [Fe3O(COO)6(H2O)3]
tunable pore apertures to enforce functionalized pore
cluster,[41] the C=C bonds of UPC-60-Cl are distorted by 10.513°
and 35.573° during the self-assembly process, resulting in the
change of crystal structure (Figure 2b). From the a,b-axis, there
are three types of irregular channels in UPC-60-Cl, the apertures
environments to selectively accommodate specific gas
molecules.[38-40]
Herein, based on rigid tricarboxylic ligand H3TTCA ([1,1':3',1''-
terphenyl]-4,4'',5'-tricarboxylic acid), we increased the flexibility of
of large (A), middle (B), and small (C) channels are 7 × 7 Å2, 4.5
the ligand by replacing part of the benzene rings with C=C bonds,
× 8 Å2, and 4 × 4.5 Å2, respectively, and the -Cl group is modified
thus presenting multiple conformations for the ligand and
in the channel A and B (Figure 2c). From a topological point of
increasing the structural diversity of MOFs (Figure 1). Moreover,
view, the SBUs and ligands are simplified to 6-connected nodes
the ligands were modified with -Cl and -NH2 to increase their
functionality. Finally, two tricarboxylic ligands H3L-Cl (4-chlorine-
3,5-bis(2-carboxyethenyl)benzoic acid) and H3L-NH2 (4-amino-
3,5-bis(2-carboxyethenyl)benzoic acid) were successfully
{611.84}{63}2 (Figure S3d). Using the SQUEEZE program in the
designed and synthesized, and two 3D Fe-MOFs (UPC-60-Cl and
and 3-connected nodes, respectively. The topological analysis
shows that the structure of UPC-60-Cl can be simplified to a novel
2-nodal (3,6-c)-connected topology with the point symbol of
PLATON software, the solvent availability of UPC-60-Cl is
calculated to be 60.70% (3696.5 Å of 6091.8 Å unit cell volume),
and the density is 0.8994 g cm-3.
UPC-60-NH2 crystallizes in the cubic space group Im-3. The
asymmetric unit of UPC-60-NH2 contains one and a half
crystallographically independent Fe(III) atoms, a deprotonated L-
UPC-60-NH2)
were
successfully
constructed
through
solvothermal reaction. Diverse channels and functionalized active
sites make UPC-60-Cl and UPC-60-NH2 show high adsorption
capacity for dyes and good selectivity for C2H2/CO2.
2
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NH23- ligand, a half μ3-O atom, and one and a half H2O molecules.
Fe3+ is connected with H3L-NH2 ligand to form the same
[Fe3O(COO)6(H2O)3] cluster as UPC-60-Cl. During the crystal
formation process, H3L-NH2 has two different conformations with
two torsion angles of 14.700° and 28.515° for the C=C bond,
respectively, and finally a 3D framework is obtained (Figure 2d).
It is worth noting that the framework of UPC-60-NH2 encloses a
cage composed of 12 SBUs and 12 ligands with a volume of 18
Å3 (Figure 2e). Interestingly, there are two types of windows on
the surface of the cage, and the sizes of windows are 2.6 × 7.0 Å2
and 6.0 × 6.0 Å2, respectively. The former is modified with -NH2
which points to the inside of the window. The topological analysis
shows that the structure of UPC-60-NH2 can be simplified to a
novel 3-nodal (3,3,6-c)-connected topology with the point symbol
of {4.62}2{42.67.86} (Figure S3f). Using the SQUEEZE program in
the PLATON software, the solvent availability of UPC-60-NH2 is
calculated to be 61.20% (24915.1 Å of 40687.4 Å unit cell volume)
and the density is 0.7719 g cm-3.
Figure 4. (a) The maximum adsorption capacity of dye molecules by UPC-60-
Cl and UPC-60-NH2. (b) The effect of time on the dye molecules adsorption by
UPC-60-Cl and UPC-60-NH2.
Dye adsorption
In recent years, water-stable MOFs have been widely used to
remove organic dyes from water based on their unique pore
structure, electrostatic adsorption, hydrogen bonding interaction,
etc.[42-47] To explore the adsorption capacity of UPC-60-Cl and
UPC-60-NH2 for different dyes, five organic dyes include
Rhodamine B (RHB, 6.53 × 11.89 × 15.55 Å3), Crystal violet (CV,
4.77 × 12.43 × 13.09 Å3), Xylenol orange (XO, 8.86 × 10.02 ×
14.17 Å3), Methyl orange (MO, 4.14 × 5.65 × 13.65 Å3), and
Chrome Blue K (CBK, 4.48 × 8.60 × 14.82 Å3) is selected for
adsorption tests. Among them, RHB and CV exhibit positive
charges, XO exhibit neutral charges, MO, and CBK exhibit
negative charges, respectively. The molecular structures of the
five dyes are shown in Figure S8.
Figure 3. The N2 adsorption diagram of UPC-60-Cl (a) and UPC-60-NH2 (b) at
As shown in Figure 4a, due to the differences in channels and
functional groups, UPC-60-Cl and UPC-60-NH2 show specific dye
adsorption effects. Among them, UPC-60-Cl has an excellent
adsorption effect on CV, RHB, and MO, with the maximum
adsorption capacity reaching 147.2, 100.3, and 220.9 mg g-1,
respectively, which is comparable to the Fe@Cu-MOF-2COOH
(MO: 225.1 mg g-1)[48] and higher than Cd-based MOF (MO: 166.7
mg g-1)[49], but lower than PCN-222 (MO: 589 mg g-1) [50]. This
adsorption performance may be due to the multiple channel
structures and environments having different adsorption effects
on the dye molecules of different sizes. However, UPC-60-NH2
exhibits selective adsorption of MO with a maximum adsorption
capacity of 158.7 mg g-1, while other larger organic dyes have
extremely low or no adsorption capacity, which may be attributed
to the synergy of appropriate cage size, hydrogen bond
interactions between -NH2 and MO, and the π-π stacking
77 K (inside: aperture distribution).
Permanent porosity
Powder X-ray diffraction (PXRD) and thermogravimetric (TG)
analysis confirmed the phase purity and thermal stability of UPC-
60-Cl and UPC-60-NH2 (Figure S4,5). The multiple channels and
cages in the frameworks prompted us to test the porosity of UPC-
60-Cl and UPC-60-NH2. Figure 3 shows that UPC-60-Cl and
UPC-60-NH2 exhibited type I N2 adsorption isotherms, and their
maximum adsorption capacities are 341.8 cm3 g-1 and 405.3 cm3
g-1, respectively. The Brunauer-Emmett-Teller (BET) and pore
distribution are 1067.9 m2 g-1 and 5.8, 6.8, 11 Å for UPC-60-Cl,
and 1692.4 m2 g-1 and 8, 10 Å for UPC-60-NH2, respectively.
3
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Figure 5. (a) Single component C2H2 and CO2 adsorption data at 298 K for UPC-60-Cl; (b) Single component C2H2 and CO2 adsorption data at 298 K for UPC-60-
NH2; (c,d) Breakthrough curves for C2H2/CO2 (50:50) separations with UPC-60-Cl (c) and UPC-60-NH2 (d) at 1 atm and 298 K.
interaction. The high adsorption capacities are comparable to
some reported MOFs (Table S4). In addition, the adsorption of
UPC-60-Cl and UPC-60-NH2 on dyes can reach adsorption
equilibrium quickly. After adding the sample, the characteristic
peak of dye molecules decreased rapidly (Figure S7). Within 12
hours, the adsorption capacity of UPC-60-Cl for CV, RHB, and
MO reached 88.95%, 97.29%, and 99.93%, respectively, and the
adsorption capacity of UPC-60-NH2 for MO reached 99.02%
(Figure 4b). The solution turns colorless, indicating that UPC-60-
Cl and UPC-60-NH2 can quickly absorb organic dye molecules
and reach saturation. PXRD analysis of UPC-60-Cl and UPC-60-
NH2 samples after dye adsorption proved that the framework
maintains high stability (Figure S9), which is expected to be
further applied to the treatment of industrial dye wastewater.
According to the calculation, UPC-60-Cl and UPC-60-NH2 has
excellent separation capacity, which better than PCN-207-FA
(C2H2: 68.90 cm3 g−1 and 32.47 kJ mol−1)[51], ZJNU-55a (C2H2:
56.3 cm3 g−1 and 42.40 kJ mol−1)[52], and PCN-307 (CO2: 73.3 cm3
g−1 and 22.84 kJ mol−1)[53]. To further evaluate the practical
C2H2/CO2 separation performance of UPC-60-Cl and UPC-60-
NH2, we tested the breakthrough of equimolar C2H2/CO2 gas
mixtures upon UPC-60-Cl and UPC-60-NH2 at 298 K and 1 bar.
As shown in Figure 5c,d, C2H2/CO2 is effectively separated
through the fixed bed. CO2 was first detected from the outlet gas
with high purity, and no C2H2 was detected in this process. This
adsorption property may be attributed to the different interaction
forces of appropriate channel structure and environment on guest
molecules. After 14 minutes, C2H2 reached saturation and
breakthrough in the adsorbent, indicating that UPC-60-Cl has
good potential to separate C2H2/CO2 in practical application. For
UPC-60-NH2, the effective separation time of C2H2/CO2 is up to
20 min g-1. The separation time of C2H2/CO2 is comparable to
some reported MOFs such as UTSA-300 (12.4 min g-1)[21] and
UTSA-74 (27 min g-1)[54] (Table S5). After four cycles of
experiments, the UPC-60-Cl and UPC-60-NH2 still maintain
excellent separation ability, which indicates that it has good
cycling stability and is expected to be used in the actual industrial
separation process.
Breakthrough experiments
Owing to the high porosity and tunable pore environment, UPC-
60-Cl and UPC-60-NH2 demonstrated remarkable light
hydrocarbons uptake (Figure S12). It is worth noting that there is
a large difference in the adsorption capacity of C2H2 and CO2. As
shown in Figure 5a,b, the maximum adsorption capacity of C2H2
and CO2 are 100.3 and 51.6 cm3 g-1 for UPC-60-Cl and 116.4 and
60.0 cm3 g-1 for UPC-60-NH2 at 298 K and 1 bar, respectively.
Therefore, we calculated the separation selectivity of UPC-60-Cl
and UPC-60-NH2 for different component C2H2/CO2 gases by
using the Ideal Adsorption Solution Theory (IAST) method and
calculated the isosteric heat of adsorption (Qst) for different gases
according to the Clausius-Clapeyron equation (Figure S13).
Conclusion
In summary, two 3D Fe-based MOFs (UPC-60-Cl and UPC-60-
NH2) with novel topology were synthesized based on two
4
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by the joint Cambridge Crystallographic Data Centre and
Fachinformationszentrum Karlsruhe Access Structures service.
tricarboxylic ligands H3L-Cl and H3L-NH2 modified by C=C bond,
-Cl, and -NH2. The diversified structure and modification of
functional groups enable UPC-60-Cl and UPC-60-NH2 to show
high adsorption capacity and adsorption rate for organic dyes.
Meanwhile, the multiple channels and cages in the framework
endow UPC-60-Cl and UPC-60-NH2 with good separation ability
for equimolar C2H2/CO2 mixed gas. Through reasonable
regulation of ligands with functional groups, the channels can be
precisely regulated to achieve the adsorption and separation of
specific guest molecules.
Gas sorption measurements
The synthesized samples were washed with DMF three times, and then
solvent-exchanged with methanol and dichloromethane three times,
respectively. The activated samples were obtained by degassing at 120°C
for 12 h under high vacuum. Gas adsorption experiments of N2, CH4, C2H2,
C2H4, C2H6, C3H6, C3H8, and CO2 were carried out using an ASAP-2020
surface area analyzer. The pore distribution and Brunauer Emmett Teller
(BET) specific surface area were calculated by using the N2 adsorption
isotherm at 77 K. The temperature of 77 K, 273 K and 298 K during the
test were maintained by liquid nitrogen bath, ice water bath and normal
temperature water bath, respectively.
Experimental Section
Materials and measurement
Dye adsorption measurements
All the chemical reagents were purchased from chemical vendors and
were used without further purification. The crystal data of UPC-60-Cl and
UPC-60-NH2 were collected using a Bruker Apex 2 Smart CCD surface
detector at 150 K. The PXRD data were collected on a Panalytical X-Pert
PRO diffractometer with Cu-Kα radiation. Elemental analyses (C, H, N)
were performed using a CE instruments EA 1110 elemental analyzer. The
1H NMR spectrum was obtained using a 400 MHz Varian INOVA
spectrometer. Thermo-gravimetric analysis (TGA) measurements were
performed under N2 atmosphere with a heating rate of 10°C min-1 at the
range of 40–900°C on a Mettler Toledo TGA instrument. Infrared spectra
(IR) were obtained within the 400–4000 cm-1 region on a Nicolet 330 FTIR
Spectrometer. Gas adsorption experiments were carried out by using the
surface area analyzer ASAP-2020. The UV-vis absorption spectrum were
obtained on a 752 PC UV-vis spectrophotometer.
Five organic dyes (Rhodamine B (RHB), Crystal violet (CV), Xylenol
orange (XO), Methyl orange (MO), and Chrome Blue K (CBK)) with
different charges and sizes were used to test the adsorption capacity of
the UPC-60-Cl and UPC-60-NH2. Before the adsorption, the synthesized
samples were treated with activation as in the gas adsorption
measurements process. For the maximum adsorption capacity, 10 mg
samples were added to 10 mL different organic dye aqueous solutions with
a concentration of 10-500 ppm and stirred continuously for 24 h. Then the
liquid was centrifuged and the supernatant was taken and tested using the
UV-vis spectrophotometer. The maximum adsorption capacity was
calculated by the Langmuir model:
퐶푒
1
푄푒 =
+
푄푚푎푥 푄푚푎푥 ⋅ 푏
Synthesis of UPC-60-Cl [Fe3O(L-Cl)2(H2O)3].3H2O
(Ce (ppm): equilibrium concentration of dyes; Qe (mg g-1): the adsorption
amounts of dyes; Qmax: the maximum adsorption capacity of dyes; b: the
Langmuir constant). In addition, 10 mg samples were added to 10 mL 20
ppm different organic dye aqueous solutions, the adsorption rate were
obtained by testing the adsorption amount at different times.
H3L-Cl (7.0 mg, 0.023 mmol) and FeCl3 (31.0 mg, 0.19 mmol) were
ultrasonically dissolved in a mixed solvent of DMF (2 mL) and CH3COOH
(0.24 mL) in a 10 mL Teflon reactor. After slowly heated to 150°C in 1 h,
the mixture was kept at 150°C for 12 h. Then the mixture was slowly cooled
to 30°C at a rate of 0.1°C min-1, and the dark-red crystals were collected,
washed with DMF and then dried in air (yield: 65% based on H3L-Cl).
Elemental analysis calculated (%) for UPC-60-Cl: C, 37.82; H, 2.18.
Found: C, 36.53; H, 2.11.
Breakthrough experiments
Breakthrough experiments of equimolar C2H2/CO2 mixed gases were
completed employing a fixed bed. The UPC-60-Cl (365.7 mg) and UPC-
60-NH2 (362.2 mg) which solvent-exchanged with methanol and
dichloromethane were filled in a stainless steel column respectively and
then kept at 120°C for 12 h with the He flow (2 mL min-1 at 298 K) for
activation ahead of the experiment. After that, the column was filled with
He flow, and the equimolar C2H2/CO2 mixed gas was introduced to the
column (2 mL min-1 at 298 K).
Synthesis of UPC-60-NH2 [Fe3O(L-NH2)2(H2O)3].4H2O.
H3L-NH2 (15.0 mg, 0.054 mmol) and [Fe3(μ3-O)(CH3COO)6] cluster[55]
(10.0 mg, 0.019 mmol) were ultrasonically dissolved in a mixed solvent of
DMF (2 mL) and CH3COOH (0.38 mL) in a 10 mL Teflon reactor. After
slowly heated to 150°C in 1 h, the mixture was kept at 150°C for 12 h. Then
the mixture was slowly cooled to 30°C at a rate of 0.1°C min-1, and the
dark-red crystals were collected, washed with DMF and then dried in air
(yield: 67% based on H3L-NH2). Elemental analysis calculated (%) for
UPC-60-NH2: C, 39.60; H, 3.05; N, 3.55. Found: C, 39.52; H, 3.08; N, 3.56.
Acknowledgements
This work was supported by the National Natural Science
Foundation of China (NSFC, Grant No. 21875285), the
Fundamental Research Funds for the Central Universities
(20CX05010A), and the Key Research and Development Projects
of Shandong Province (2019JZZY010331).
Crystal structure determinations
Crystallographic data of UPC-60-Cl and UPC-60-NH2 were collected by
using Bruker Apex 2 Smart CCD surface detector at 150 K. Using an (Cu)
X-ray source (Cu Kα λ = 1.54184 Å) and a graphite monochromator were
with Multiscan program SADABS for absorption correction. Structural
analysis were performed by the Superflip method through the Olex 2
software package and the ShelXL method were used for structural
refinement. All nonhydrogen atoms were anisotropically refined. The
detailed crystallographic data for UPC-60-Cl and UPC-60-NH2 are listed
in Supporting Information, respectively. Deposition numbers 2050509 (for
UPC-60-Cl) and 2051471 (for UPC-60-NH2) contain the supplementary
crystallographic data for this paper. These data are provided free of charge
Keywords: Metal-Organic Frameworks • Ligand Conformation
Regulation • Dye Adsorption • C2H2/CO2 Separation
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This article is protected by copyright. All rights reserved.

10.1002/chem.202101053
Chemistry - A European Journal
FULL PAPER
Entry for the Table of Contents
FULL PAPER
Two 3D Fe-MOFs (UPC-60-Cl and
UPC-60-NH2) were constructed based
on UPC-200(Fe)-H-H2O by replacing
part of the benzene rings with C=C
bonds and modifying -Cl- and -NH2 on
the ligand. The synergistic effect of
diversified structure and modification
of functional groups endow UPC-60-Cl
and UPC-60-NH2 with high adsorption
capacity for dyes and good C2H2/CO2
separation ability. Through reasonable
regulation of ligands with functional
groups, the structure can be precisely
regulated to achieve the adsorption
and separation of specific guest
molecules.
Metal–Organic Frameworks
X. Zhang, W. Fan*, W. Jiang, Y. Li, Y.
Wang, M. Fu, and D. Sun*
Page No. – Page No.
Optimizing Fe-based Metal-Organic
Frameworks
Conformation Regulation for Efficient
Dye Adsorption and C2H2/CO2
Separation
through
Ligand
7
This article is protected by copyright. All rights reserved.