CN114988515A - Method for removing Cr (VI) and g-C adopted by same 3 N 4 Composite foam/cellulose/GO - Google Patents
Method for removing Cr (VI) and g-C adopted by same 3 N 4 Composite foam/cellulose/GO Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
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- B01J35/39—Photocatalytic properties
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/10—Photocatalysts
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The invention relates to a method for removing Cr (VI) and g-C adopted by the method 3 N 4 a/cellulose/GO syntactic foam. In the invention, g-C 3 N 4 The powder is integrated into a cellulose/GO matrix, and g-C is obtained by a freeze-drying method 3 N 4 a/cellulose/GO composite three dimensional foam. g-C prepared by the invention 3 N 4 Composite foam of/cellulose/GO, g-C 3 N 4 Form crosslinks with carboxyl cellulose, g-C 3 N 4 The particles adhere tightly to the foamAnd GO is uniformly dispersed on the framework, so that the light absorption is promoted and the stability of the composite film is improved. Reduction of Cr (VI), best sample (g-C) with visible light 3 N 4 CG-3) loading of 60 wt% can remove 98% of Cr (VI) within 3 hours. In addition, syntactic foams are easy to recycle, without the need for complex separation procedures, and CG-3 has no significant loss of its original reducing properties after 9 cycles, demonstrating its high reusability.
Description
Technical Field
The invention belongs to the technical field of photocatalysts, and particularly relates to a method for removing Cr (VI) and g-C adopted by the same 3 N 4 a/cellulose/GO syntactic foam.
Background
Graphite phase carbon nitride (g-C) 3 N 4 ) Is an emerging visible light responsive photocatalyst that is of interest due to its attractive electronic band structure, excellent physicochemical stability, and metal-free nature. g-C 3 N 4 The base photocatalyst shows great potential in the fields of selective organic synthesis, bacterial disinfection, carbon dioxide emission reduction and environmental remediation. Efforts are made to increase g-C 3 N 4 The photocatalytic efficiency of the base material, such as nanostructure design, heteroatom doping, recombination with other semiconductors, and monoatomic modification. However, g-C 3 N 4 Base catalysts are typically used in powder form, which makes their recyclability and processability a significant challenge. In contrast, g-C 3 N 4 Integration into suitable substrates to produce easy to handle and cost effective photocatalysts is currently of great interest.
More recently, cellulose has become a loading and fixing powderIdeal candidate materials for the final semiconductor photocatalyst. Cellulose, the most abundant polymer in nature, has adjustable surface groups, low density and can be easily processed into a variety of shapes. In particular, aerogels or foams made from nanocellulose have attracted extensive research interest due to their high flexibility and recyclability. G to C 3 N 4 Embedded in a cellulose skeleton and used for photocatalytic degradation of organic pollutants. Cellulose and g-C are established 3 N 4 The chemical bond between them, the hybrid aerogel shows high structural stability.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the invention is to provide a method for removing Cr (VI), which is used for photocatalytic reduction of Cr (VI) to Cr (III) under visible light.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for removing Cr (VI) by using g-C under visible light condition 3 N 4 the/cellulose/GO composite foam catalyzes the removal of Cr (VI).
The method for removing Cr (VI), g-C 3 N 4 The preparation method of the/cellulose/GO composite foam comprises the following steps: firstly, using urea as precursor, thermal polymerization to obtain g-C 3 N 4 Powder; then the prepared g-C is added 3 N 4 Uniformly dispersing the powder into mixed suspension of GO and CNF, freezing and molding, and freeze-drying to obtain g-C 3 N 4 a/cellulose/GO syntactic foam.
The g to C 3 N 4 Preparation method of/cellulose/GO composite foam: weighing 5-10g of urea, adding the urea into a 50-100mL ceramic crucible, and heating the mixture in a muffle furnace for reaction at the reaction temperature of 400-600 ℃ for 6-12 h.
The g to C 3 N 4 Preparation method of/cellulose/GO composite foam: g-C in mixed suspension 3 N 4 The mass ratio of GO to GO is 0.2-0.8, g-C 3 N 4 And CNF in a mass ratio of 0.1-0.4.
The g to C 3 N 4 cellulose/GO complexThe preparation method of the synthetic foam comprises the following steps: freeze drying in a freeze drier at-50 deg.c to-60 deg.c for 1-24 hr.
The method for removing Cr (VI), g-C 3 N 4 g-C in/cellulose/GO syntactic foams 3 N 4 The loading is not less than 50 wt%.
The method for removing Cr (VI), g-C 3 N 4 g-C in/cellulose/GO syntactic foams 3 N 4 The loading was 60 wt%.
g-C 3 N 4 The preparation method of the/cellulose/GO composite foam is characterized by comprising the following steps: firstly, using urea as precursor, thermal polymerization to obtain g-C 3 N 4 Powder; then the prepared g-C is added 3 N 4 Uniformly dispersing the powder into mixed suspension of GO and CNF, freezing and molding, and freeze-drying to obtain g-C 3 N 4 a/cellulose/GO syntactic foam.
The g to C 3 N 4 g-C obtained by preparation method of/cellulose/GO composite foam 3 N 4 a/cellulose/GO syntactic foam.
The g to C 3 N 4 Application of/cellulose/GO composite foam in reduction of Cr (VI).
The invention prepares flexible g-C with visible light photocatalytic activity 3 N 4 a/cellulose/GO syntactic foam. Due to g-C 3 N 4 The presence of the upper amino group, which can be tightly attached to the foam matrix by hydrogen bonding with the hydroxyl/carboxyl groups on cellulose and GO. A light and water stable foam is obtained and ultra high g-C can be achieved 3 N 4 And (4) loading. Photocatalytic activity was assessed by visible light driven cr (vi) reduction. The syntactic foam has high Cr (VI) removal rate, easy recovery and good reusability. Such foams may be attractive candidates in many environmental remediation applications.
Has the advantages that: compared with the prior art, the invention has the advantages that:
1) invention g-C 3 N 4 /cellulose/GO compositesThe preparation process of the foam photocatalyst is simple and easy to control, the operation is convenient and the price is low.
2) g-C prepared by the invention 3 N 4 Composite foam of/cellulose/GO, g-C 3 N 4 Form crosslinks with carboxyl cellulose, g-C 3 N 4 The particles are tightly attached to the foam skeleton and uniformly dispersed, the presence of GO promotes light absorption and improves the stability of the composite film, and visible light is used to drive the reduction of Cr (VI) to Cr (III), the best sample (g-C) 3 N 4 CG-3) loading of 60 wt% can remove 98% of Cr (VI) within 3 hours.
3) Invention g-C 3 N 4 the/cellulose/GO composite foam has simple use mode. The catalyst can be used only by being put into sewage and then irradiated by natural light under normal temperature and pressure; and has the advantages of easy recovery and no secondary pollution.
Drawings
FIG. 1 is a SEM topography profile of various composites, wherein: (a) is C 3 N 4 SEM image of/CNF composite material; (b) is a SEM image of the GO/CNF composite; (c) and (d) are SEM images of CG-3 foam at different resolutions;
FIGS. 2(a) and 2(b) are syntactic foam, CNF foam and g-C, respectively 3 N 4 An XRD pattern and FT-IR pattern of (1);
figure 3 is an XPS spectrum of a sample wherein: (a) is CG-3 foam, CNF foam and g-C 3 N 4 XPS survey of (a); (b) is a C1 s high resolution spectrum; (c) is an N1 s high resolution spectrogram; (d) is an O1 s high resolution spectrum;
FIG. 4 is a reaction mechanism diagram of CG-3 photocatalytic reduction Cr (VI);
FIG. 5 is a CG-3 foam and original g-C 3 N 4 Cycle test pattern of the powder.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1 preparation of composite photocatalyst
1、g-C 3 N 4 /CNF composite material lightPreparation of the catalyst
1)g-C 3 N 4 Preparation of powder: weighing 5-10g of urea, adding into a 50-100mL ceramic crucible, and heating in a muffle furnace at 10 deg.C for min -1 The temperature rise speed is 400-600 ℃ for 6-12 h.
2)g-C 3 N 4 Preparation of/CNF composite: according to g-C 3 N 4 The mass ratio of the prepared g-C to CNF is 0.1, and the prepared g-C is weighed 3 N 4 The powder was added to the CNF suspension and stirred to give a homogeneous suspension. The mixture was poured into a mold having a size of 1X 1cm 3 Placing in square mold, transferring the mixture into refrigerator, freezing, and freeze drying in a freeze drier to obtain g-C 3 N 4 a/CNF composite material.
2. Preparing a GO/CNF composite material photocatalyst: weighing the two substances according to the mass ratio of GO to CNF of 0.5 to prepare a mixed suspension, and stirring to obtain a uniform suspension. The mixture is poured into a size of 1X 1em 3 And (3) transferring the mixture into a square mold, freezing and molding the mixture in a refrigerator, and performing freeze drying treatment in a freeze dryer to obtain the GO/CNF composite material.
3、g-C 3 N 4 Preparation of/cellulose/GO composite foam photocatalyst
1)g-C 3 N 4 Preparation of powder: weighing 5-10g of urea, adding into a 50-100mL ceramic crucible, and heating in a muffle furnace at 10 deg.C for min -1 The temperature rise speed is 400-600 ℃ for 6-12 h.
2)g-C 3 N 4 Preparation of/cellulose/GO syntactic foam: according to g-C 3 N 4 And GO is 0.2 in mass ratio of g-C 3 N 4 The mass ratio of the prepared g-C to CNF is 0.1, and the prepared g-C is weighed 3 N 4 The powder was added to the mixed suspension of GO and CNF, and a homogeneous suspension was obtained after stirring. The mixture was poured into a mold having a size of 1X 1cm 3 And (4) transferring the mixture into a refrigerator for freezing and forming after the mixture is placed in a square mold, and performing freeze drying treatment in a freeze dryer. The resulting foam is designated CG-1.
4、g-C 3 N 4 Preparation of/cellulose/GO composite foam photocatalyst
1)g-C 3 N 4 Preparation of powder: weighing 5-10g of urea, adding into a 50-100mL ceramic crucible, and heating in a muffle furnace at 10 deg.C for min -1 The temperature rise speed is 400-600 ℃ for 6-12 h.
2)g-C 3 N 4 Preparation of/cellulose/GO syntactic foam: according to g-C 3 N 4 And GO is 0.4 in mass ratio of g-C 3 N 4 The mass ratio of the C to CNF is 0.2, and the prepared g-C is weighed 3 N 4 The powder was added to the mixed suspension of GO and CNF, and a homogeneous suspension was obtained after stirring. The mixture was poured into a mold having a size of 1X 1cm 3 And (4) transferring the mixture into a refrigerator for freezing and forming after the mixture is placed in a square mold, and performing freeze drying treatment in a freeze dryer. The resulting foam is designated CG-2.
5、g-C 3 N 4 Preparation of/cellulose/GO composite foam photocatalyst
1)g-C 3 N 4 Preparation of powder: weighing 5-10g of urea, adding into a 50-100mL ceramic crucible, and heating in a muffle furnace at 10 deg.C for min -1 The temperature rise speed is heated for 6-12h at 400-600 ℃.
2)g-C 3 N 4 Preparation of/cellulose/GO syntactic foam: according to g-C 3 N 4 And GO is 0.6 in mass ratio of g-C 3 N 4 The mass ratio of the prepared g-C to CNF is 0.3, and the prepared g-C is weighed 3 N 4 The powder was added to the mixed suspension of GO and CNF, and a homogeneous suspension was obtained after stirring. The mixture was poured into a mold having dimensions of 1X 1cm 3 And (4) transferring the mixture into a refrigerator for freezing and forming after the mixture is placed in a square mold, and performing freeze drying treatment in a freeze dryer. The resulting foam is designated CG-3.
6、g-C 3 N 4 Preparation of/cellulose/GO composite foam photocatalyst
1)g-C 3 N 4 Preparation of powder: weighing 5-10g of urea, adding into a 50-100mL ceramic crucible, and heating in a muffle furnace at 10 deg.C for min -1 The temperature rise speed is 400-600 ℃ for 6-12 h.
2)g-C 3 N 4 Preparation of/cellulose/GO syntactic foam: according to g-C 3 N 4 The mass ratio of the GO to the GO is 0.8, g-C 3 N 4 The mass ratio of the C to CNF is 0.4, and the prepared g-C is weighed 3 N 4 The powder was added to the mixed suspension of GO and CNF, and a homogeneous suspension was obtained after stirring. The mixture was poured into a mold having a size of 1X 1cm 3 And (4) transferring the mixture into a refrigerator for freezing and forming after the mixture is placed in a square mold, and performing freeze drying treatment in a freeze dryer. The resulting foam is designated CG-4.
The samples obtained above were characterized and tested as follows:
1. SEM analysis
SEM is used to observe the microscopic morphology, particle size and surface distribution of the components of a sample, which is typically prepared for testing on a silicon wafer. A field emission scanning electron microscope (JSM-7600F) was used, with an operating voltage of 30 kV.
FIG. 1 is a SEM topography representation of various composite materials, as shown in FIGS. 1a and 1b, C 3 N 4 the/CNF composite and GO/CNF composite have interconnected highly porous structures, with sublimation of ice crystals giving them a rich micro-scale porosity, in contrast to the morphology of CG-3 shown in fig. 1c with a denser porous structure and more disordered porosity. GO and g-C 3 N 4 The introduction of (a) compresses the voids between the cellulose fibers to form a layered stack structure. At higher resolution in FIG. 1d, g-C can be observed 3 N 4 Uniformly attached to the foam skeleton, some g-C 3 N 4 The particles are tightly packed with a cellulose/GO matrix, forming a layered porous, layered porous and high surface area that facilitates the mass transfer process and improves the accessibility of the photoactive sites.
2. XRD analysis
XRD was used to analyze the crystal phase structure and composition of each sample using an X-ray diffractometer (UltimaIV) under conditions of copper target (Cu ka) radiation (K: 0.1542nm) and an operating voltage of 40 kV.
Figure 2 is an XRD pattern of different samples. As shown in FIG. 2, pure g-C 3 N 4 The powder had two peaks at 12.9 ℃ and 27.1 ℃ corresponding to g-C, respectively 3 N 4 (100) and (002) crystal planes (JCPDS 87-1526). (100) The diffraction peak corresponds to the in-plane tris-triazine ring, while the (002) diffraction peak represents the stacking of the C-N aromatic conjugated interlayer structure. Nanocellulose has a peak at 22.4 °, which is consistent with type I cellulose. The peak appearing around 12.2 ° is attributed to the substance GO. G to C 3 N 4 After the composite foam is added, the materials can be clearly identified with cellulose, GO and g-C 3 N 4 The peak of the correlation. With g-C 3 N 4 The signal at 27.1 ° becomes more intense with increasing content. XRD results confirmed g-C 3 N 4 A foam network was successfully introduced.
3. FT-IR analysis
FT-IR is used to test the chemical structure, functional groups and bond state characteristics of a sample, and the chemical composition of the sample can be determined from the molecular level. A Fourier infrared spectrometer (Nicolet-360) is used, and a certain amount of KBr and a sample are uniformly ground to carry out testing by taking spectrally pure KBr as a background.
The chemical functional groups were analyzed by FT-IR spectroscopy, as shown in FIG. 2(b), from 1180 to 1650cm -1 The peak appearing is designated as g-C 3 N 4 C ═ N typical stretching mode of heterocycles; at 822cm -1 The peak is due to g-C 3 N 4 Respiratory oscillations of the medium triazine unit; wherein 1050cm -1 The pronounced peaks in (A) are related to the stretching vibration of the C-O-C group of CNF, these peaks are well inherited by syntactic foams, further demonstrating that g-C 3 N 4 Successfully integrated into the foam matrix. In the syntactic foam, the characteristic peaks of GO are not significant due to overlap and low strength, from another perspective, indicating a uniform dispersion of GO on the cellulose nanofibers. At 3300cm -1 The centered peak is due to vibrational stretching of the-NH and-OH groups, g-C 3 N 4 The peak is broadened and weakened by the intercalation of (b), which is due to the formation of cross-links.
4. XPS analysis
XPS is used to analyze the valence state, ratio and even the valence band potential of a single component of elements contained in a sample. An X-ray photoelectron spectrometer (AXIS UltraDLD) is used, and the binding energy of all elements takes the peak of C1 s of an external pollution carbon source at 284.8eV as a reference.
XPS testing characterized g-C 3 N 4 Chemical composition and chemical state of surface elements of/cellulose/GO composite foam. As shown in FIG. 3a, g-C 3 N 4 C, N, O element was detected in the CNF and CG-3 composites. In FIG. 3b, the characteristic peaks at 284.7eV, 286.3eV and 288.8eV in the C1 s high-resolution spectrum correspond to g-C 3 N 4 Sp of C-C, C-O and N-C ═ N in the molecular structure 2 . The peak signals appearing at 287.3eV and 288.4eV are due to C ═ O of the GO framework and CNF. In FIG. 3c, the peak at 398.1eV, 399.1eV and 400.4eV in the peak separation result of the N1 s high resolution spectrum are respectively represented by sp 2 Hybridized nitrogen C ═ N-C, tertiary nitrogen N- (C) 3 And C-N-H functional groups. In FIG. 3d, the high resolution spectrum of O1 s indicates the presence of-OH and-COOH functional groups in the syntactic foam.
Example 2 photocatalytic Performance testing
1. Photocatalytic performance
The light source of the reaction was a 300W xenon lamp with a UV filter (CEL-HXF300, lambda > 420nm, intensity 54mW/cm 2 ). With K 2 Cr 2 O 7 The cr (vi) solution was prepared as a hexavalent chromium simulant with normal reaction conditions at room temperature and pH of about 6. The method comprises the following specific steps: 40mg of syntactic foam was weighed into 40mL of 50mg/L Cr (VI) aqueous solution and stirred continuously. Before the light starts, the adsorption was equilibrated by stirring for 1h in the dark. After turning on the lamp, samples were taken at regular intervals by syringe (one sample of about 3mL) and the solution to be tested was obtained by filtering out the solid particles of the catalyst through a 0.22 μm frit. Finally, the absorbance is tested at 540nm by a diphenyl carbazide (DPC) coloring method, and the Cr (VI) concentration is calculated by standard curve conversion, so that the reduction performance of each material is obtained.
Table 1 shows the performance of the photocatalytic reduction of cr (vi) for the different samples. Visible light catalysis to reduce cr (vi) to cr (iii) can be used to evaluate the performance of the composite catalyst. As a control experiment, GO/CNF composites and g-C 3 N 4 the/CNF composite material is usedIn the photocatalytic reduction of Cr (VI), the results show that the two materials have poor reduction capability on Cr (VI), which is 10% and 52%, respectively. For pure g-C 3 N 4 The reduction capacity of Cr (VI) after 180min of light irradiation is about 90%. The CG-1 sample had a Cr (VI) reducing power of 73% due to the insufficient active site. The photocatalytic activity is dependent on the g-C content of the composite material 3 N 4 The content increases. However, the reducing power of CG-3 (98%) is higher than that of CG-4 (89%), because of g-C in CG-4 3 N 4 Are saturated with active sites, so the optimal syntactic foam is g-C 3 N 4 The load is 60 wt% of CG-3.
TABLE 1 photocatalytic Cr (VI) reduction Performance of different samples
| Composite material | g-C 3 N 4 | g-C 3 N 4 /CNF | GO/CNF | CG-1 | CG-2 | CG-3 | CG-4 |
| Reduction Property | 90％ | 52％ | 10％ | 73％ | 88％ | 98％ | 89％ |
2. Mechanism of photocatalytic reduction
FIG. 4 shows g-C under simulated solar radiation 3 N 4 Cr (VI) reduction mechanism diagram on/cellulose/GO composite foam. g-C attached to foam substrate under irradiation of light 3 N 4 Can be excited to produce photogenerated electrons and holes. Foams with graded porosity effectively reduce charge transport distance. The cellulose foam skeleton has hydrophilicity, and is favorable for the transfer of active substances in aqueous solution. The generated electrons rapidly reduce cr (vi) to inhibit recombination of electrons and holes. In addition, GO enhances the conductivity of the foam and further facilitates the separation of electrons and holes.
3. Cycle testing
To test the stability and recyclability of the catalyst, the CG-3 foam after reaction was easily recovered from the solution by tweezers, washed the used foam with deionized water and ethanol, and freeze dried for the next cycle. g-C after reaction 3 N 4 The powder is obtained by multiple centrifugations, washing with ethanol and deionized water, and drying, and a bench high speed centrifuge (CenLee 16K) is used.
FIG. 5 is a CG-3 foam and pristine g-C 3 N 4 Powder cycle test chart, concentration of 50mgL at 40mL -1 The Cr (VI) solution of (A) and (B) was added to 40mg of the above two catalysts, respectively, and the visible light lambda was > 420 nm. The CG-3 foam can be easily separated from the solution and regenerated by ethanol washing. After 9 cycles, the performance of the CG-3 for reducing Cr (VI) by photocatalysis is slightly reduced. And for powdery g-C 3 N 4 Repeated use is difficult and complicated and performance drops significantly during cycling experiments.
Claims (10)
1. A method for removing Cr (VI) is characterized in that g-C is used under visible light conditions 3 N 4 The composite foam of/cellulose/GO can remove Cr (VI) catalytically.
2. The method of claim 1 for removing cr (vi), wherein: g-C 3 N 4 The preparation method of the/cellulose/GO composite foam comprises the following steps: firstly, using urea as precursor, thermal polymerization to obtain g-C 3 N 4 A powder; then the prepared g-C is mixed 3 N 4 Uniformly dispersing the powder into mixed suspension of GO and CNF, freezing and molding, and freeze-drying to obtain g-C 3 N 4 a/cellulose/GO syntactic foam.
3. The method of claim 2 for removing cr (vi), wherein: weighing 5-10g of urea, adding the urea into a 50-100mL ceramic crucible, and heating the mixture in a muffle furnace for reaction at the reaction temperature of 400-600 ℃ for 6-12 h.
4. The method of claim 2 for removing cr (vi), wherein: g-C in mixed suspension 3 N 4 The mass ratio of the GO to the GO is 0.2-0.8, and g-C 3 N 4 And CNF in a mass ratio of 0.1-0.4.
5. Method for removing cr (vi) according to claim 1 or 2, characterized in that: freeze drying in a freeze drier at-50 deg.c to-60 deg.c for 1-24 hr.
6. Method for removing cr (vi) according to claim 1 or 2, characterized in that: g-C 3 N 4 g-C in/cellulose/GO syntactic foams 3 N 4 The loading is not less than 50 wt%.
7. Method for removing cr (vi) according to claim 1 or 2, characterized in that: g-C 3 N 4 In the/cellulose/GO composite foam, g-C 3 N 4 Load(s)The amount was 60 wt%.
8. g-C 3 N 4 The preparation method of the/cellulose/GO composite foam is characterized by comprising the following steps: firstly, using urea as precursor, thermal polymerization to obtain g-C 3 N 4 A powder; then the prepared g-C is mixed 3 N 4 Uniformly dispersing the powder into mixed suspension of GO and CNF, freezing and molding, and freeze-drying to obtain g-C 3 N 4 a/cellulose/GO syntactic foam.
9. g-C as claimed in claim 8 3 N 4 g-C obtained by preparation method of/cellulose/GO composite foam 3 N 4 a/cellulose/GO syntactic foam.
10. g-C as claimed in claim 9 3 N 4 Use of/cellulose/GO composite foams for reducing Cr (VI).
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