Metal-free catalysts of graphitic carbon nitride–covalent organic frameworks for efficient pollutant destruction in water

Yao, Yunjin; Hu, Yi; Hu, Huanhuan; Chen, Luwang; Yu, Maojing; Gao, Mengxue; Wang, Shaobin

doi:10.1016/j.jcis.2019.07.002

Cited by 79 publications

(25 citation statements)

References 51 publications

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“…Additionally, the produced CO 2 and K 2 O could further react with carbon over 700 °C to K. During physical and chemical activations, the carbon lattices expanded irreversibly and resulted in many micropores. Since these chemical reactions occurred at over 700 °C, the specific surface area was mainly related to the addition ratio of the K 2 FeO 4 [ 29 ]. More micropores are shown in Figure 1 d–f than Figure 1 b–d, so high dosage K 2 FeO 4 made the microporous structure more powerful.…”

Section: Resultsmentioning

confidence: 99%

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Efficient Removal 17-Estradiol by Graphene-Like Magnetic Sawdust Biochar: Preparation Condition and Adsorption Mechanism

Zhou

Liu

et al. 2020

IJERPH

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The occurrence of environmental endocrine disrupting chemicals (EDCs) in aquatic environments has caused extensive concern. Graphene-like magnetic sawdust biochar was synthesized using potassium ferrate (K2FeO4) to make activated sawdust biochar and applied for the removal of 17-estradiol (E2). The characterization showed that the surface morphology of five graphene-like magnetic sawdust biochars prepared with different preparation conditions were quite different. The specific surface area and pore structure increased with the increment of K2FeO4 addition. The results have shown that graphene-like magnetic sawdust biochar (1:1/900 °C) had the best removal on E2. The experimental results indicated that pseudo-first-order kinetic model and the Langmuir model could describe the adsorption process well, in which the equilibrium adsorption capacity (qe,1) of 1:1/900 °C were 59.18 mg·g−1 obtained from pseudo-first-order kinetic model and the maximum adsorption capacity (qmax) of 1:1/900 °C were 133.45 mg·g−1 obtained from Langmuir model at 298K. At the same time, lower temperatures, the presence of humic acid (HA), and the presence of NaCl could be regulated to change the adsorption reaction in order to remove E2. Adsorption capacity was decreased with the increase of solution pH because pH value not only changed the surface charge of graphene-like magnetic sawdust biochar, but also affected the E2 in the water. The possible adsorption mechanism for E2 adsorption on graphene-like magnetic sawdust biochar was multifaceted, involving chemical adsorption and physical absorption, such as H-bonding, π-π interactions, micropore filling effects, and electrostatic interaction. To sum up, graphene-like magnetic sawdust biochar was found to be a promising absorbent for E2 removal from water.

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Section: Resultsmentioning

confidence: 99%

“…Thus, the Raman spectra revealed the existence of graphitic structures on the samples after treated with K 2 FeO 4 and annealed with high temperature. Moreover, the higher graphitization temperature was also beneficial to graphitization [ 29 ].…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal 17-Estradiol by Graphene-Like Magnetic Sawdust Biochar: Preparation Condition and Adsorption Mechanism

Zhou

Liu

et al. 2020

IJERPH

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“…A key challenge is that most of these metal-free materials suffer from the limitations of intrinsic chemical structures which are difficult to be optimized targeting suitable band structures and desirable properties. Therefore, tedious modification processes such as chemical modifications, 9,13 elemental doping, 14 and formation of heterojunctions 15,16 are inevitable for tailoring band structures and enhancing catalytic activities. Besides, the amorphous nature and low accessible surface areas of these materials impede the charge transfer and reduce the possibility of the contact between pollutant molecules and ROSs, which have extremely short half-life times to diffuse, impairing the performance of photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Only a few COF-based catalysts for Fenton-like reactions have been reported hitherto. In these works, COFs merely served as substrates for catalysts including Fe ions, 39 single-atom Fe 40 , or g-C3N4 16 , and their intrinsically catalytic performances are yet to be explored. Additionally, the COF-based photocatalysts for Fenton-like reactions have not been presented so far.…”

Section: Introductionmentioning

confidence: 99%

Metal-free Fenton-like photocatalysts based on covalent organic frameworks

Liao

Wang

et al. 2021

Applied Catalysis B: Environmental

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“…In recent years, metal-free catalysts have aroused wide concern [ 31 , 32 ]. Carbon nanomaterials, such as carbon nanotubes (CNTs) and graphene, have surface chemical inertness, good electric conductivity, high specific surface area, large pore volume, and have been proven to be of good catalytic effect in different kinds of degradation [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

N-Doped Biochar as a New Metal-Free Activator of Peroxymonosulfate for Singlet Oxygen-Dominated Catalytic Degradation of Acid Orange 7

et al. 2021

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In this paper, using rice straw as a raw material and urea as a nitrogen precursor, a composite catalyst (a nitrogen-doped rice straw biochar at the pyrolysis temperature of 800 °C, recorded as NRSBC800) was synthesized by one-step pyrolysis. NRSBC800 was then characterized using XPS, BET, TEM and other technologies, and its catalytic performance as an activator for permonosulfate (PMS) to degrade acid orange 7 (AO7) was studied. The results show that the introduction of N-doping significantly improved the catalytic performance of NRSBC800. The NRSBC800/PMS oxidation system could fully degrade AO7 within 30 min, with the reaction rate constant (2.1 × 10 −1 min−1) being 38 times that of RSBC800 (5.5 × 10−3 min−1). Moreover, NRSBC800 not only had better catalytic performance than traditional metal oxides (Co3O4 and Fe3O4) and carbon nanomaterial (CNT) but also received less impact from environmental water factors (such as anions and humic acids) during the catalytic degradation process. In addition, a quenching test and electron paramagnetic resonance (EPR) research both indicated that AO7 degradation relied mainly on non-free radical oxidation (primarily singlet oxygen (1O2)). A recycling experiment further demonstrated NRSBC800’s high stability after recycling three times.

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Metal-free catalysts of graphitic carbon nitride–covalent organic frameworks for efficient pollutant destruction in water

Cited by 79 publications

References 51 publications

Efficient Removal 17-Estradiol by Graphene-Like Magnetic Sawdust Biochar: Preparation Condition and Adsorption Mechanism

Efficient Removal 17-Estradiol by Graphene-Like Magnetic Sawdust Biochar: Preparation Condition and Adsorption Mechanism

Metal-free Fenton-like photocatalysts based on covalent organic frameworks

N-Doped Biochar as a New Metal-Free Activator of Peroxymonosulfate for Singlet Oxygen-Dominated Catalytic Degradation of Acid Orange 7

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