One-step hydrothermal synthesis of Cu-doped MnO2 coated diatomite for degradation of methylene blue in Fenton-like system

Yu, Xiao; Huo, Wangchen; Yin, Shi; Jiang, Dagang; Zhang, Yuxin; Zhang, Zhiqiang; Liu, Xiao Ying; Dong, Fan; Wang, Jinshu; Li, Gang; Hu, Xiaoyun; Yuan, Xiaoya; Yao, Hong-Chang

doi:10.1016/j.jcis.2019.08.082

Cited by 44 publications

(22 citation statements)

References 60 publications

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“…Although the MnO 2 pattern did not change, the addition of Cu caused a decrease in the MnO 2 peak intensity. When doping some transition metals (including Cu) into MnO 2 , Cu ions could enter the MnO 2 lattice and cause distortion of the MnO 2 lattice; this corresponded to the results of previous studies [24,44–48] …”

Section: Resultssupporting

confidence: 88%

“…The MnO 2 crystallite sizes were 72.3, 75.7, 73.4, and 75.9 Å and the CuO crystallite sizes were 180.3, 158.5, 182.5, and 208.9 Å from 0.10 CuMn x O y _I, 0.15 CuMn x O y _I, 0.20 CuMn x O y _I, and 0.25 CuMn x O y _I, respectively. After adding Cu, the peak position (2θ) at the third peak of MnO 2 was slightly shifted from 56.3039° to 56.4635°, because the ionic radius of Cu is larger than Mn, revealing that the Cu ions were intercalated into MnO 2 [43–44] . Although the MnO 2 pattern did not change, the addition of Cu caused a decrease in the MnO 2 peak intensity.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

et al. 2022

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Improving manganese oxides as cathodic catalysts in direct methanol/hydrogen peroxide fuel cells by incorporation of Cu and Fe to promote oxygen reduction (OR) and hydrogen peroxide reduction (HPR) is reported. The Cu‐incorporated and Fe‐incorporated MnxOy were prepared by impregnation and solvothermal processes. From XRD, XPS, and XAS analyses, the obtained MnxOy consisted of MnO2 and mixed phases of Mn3O4 and Mn2O3 from impregnation and solvothermal methods, respectively. The Cu‐incorporated and Fe‐incorporated MnxOy included CuO and Fe2O3, respectively, through both methods. Addition of Cu and Fe decreased the BET surface area and increased the pore sizes as compared to the pristine MnO2. With the Fe : Mn molar ratio of 0.20 : 1, the Fe‐incorporated MnxOy from the solvothermal method presented the highest cathodic peaks under the cyclic voltammogram of HPR and OR at around 0.59 V of 11.59 mA cm−2 and −0.59 V of −12.33 mA cm−2, respectively. Compared to the Cu‐incorporated ones, the highest HPR peak at 0.68 V of 9.20 mA cm−2 and the highest OR peak at −0.59 V of −6.99 mA cm−2 were obtained from the Cu‐incorporated MnxOy prepared through the solvothermal method at the Cu : Mn molar ratio of 0.15 : 1. Incorporating Cu or Fe into MnO2 brought the improvement of electrocatalytic activity for HPR and OR. The Cu‐incorporated and Fe‐incorporated MnxOy from both methods showed a higher power density of μ‐DMFC than the pristine MnO2.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

et al. 2022

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“…In homogeneous Fenton processes, drawbacks of the secondary contamination caused by the iron‐containing sludge were encountered due to the less implement of separation 4 . Presently, great efforts have been devoted to seeking efficient heterogeneous Fenton or Fenton‐like catalysts, for example, iron sulfides, 5 iron oxides, 6 manganese oxides, 7 and such similar composites 8–11 . However, the synthesis of these catalysts always required complicated procedures with chemical/energy consumption, whereas natural iron‐bearing clays, 12–15 for example, sediments of minerals as montmorillonite, nontronite from oceans, rivers, and groundwater are of great abundance, and ought to have great potential in Fenton reactions or AOPs.…”

Section: Introductionmentioning

confidence: 99%

“…4 Presently, great efforts have been devoted to seeking efficient heterogeneous Fenton or Fenton-like catalysts, for example, iron sulfides, 5 iron oxides, 6 manganese oxides, 7 and such similar composites. [8][9][10][11] However, the synthesis of these catalysts always required complicated procedures with chemical/energy consumption, whereas natural iron-bearing clays, [12][13][14][15] for example, sediments of minerals as montmorillonite, nontronite from oceans, rivers, and groundwater are of great abundance, and ought to have great potential in Fenton reactions or AOPs. Ausavasukhi et al 13 prepared Fenton catalysts containing Fe-species by the simple thermal treatment and re-swelling of natural Fe-containing clays for the degradation of methylene blue (MB) and phenol.…”

Section: Introductionmentioning

confidence: 99%

Deep‐sea clays using as active Fenton catalysts for self‐propelled motors

et al. 2022

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Raw deep-sea clays (i.e., pelagic clays) collected from the Indian Ocean were able to function as Fenton catalysts and self-propelled micromotors due to the high content of Fe-and Mn-. The pelagic clays were for the first time observed to be automatic in the H 2 O 2 solution. The pelagic clays existed in the form of poorly crystallized marine sedimentation. The major minerals were found as illite/montmorillonite (I/M) and amorphous ferromanganese nodules, and the minor minerals included kaolinite, quartz, feldspar, and calcite. Significant amounts of oxygen bubbles were generated when the clay particles were dispersed into the H 2 O 2 solution (0.1-10.0 wt.%), and the average velocity of the motors was observed as high as 183.0 μm s -1 in 10.0 wt.% H 2 O 2 . The selfpropulsion would induce vigorous mixing in local areas of the solution and was confirmed to benefit the catalytic performance. The clays were employed to remove Rhodamine B (RhB) for a proof-of-concept study. In the acid solution (pH = 1.0-5.0), the removal of RhB was controlled by the Fenton process accompanied by the adsorption of clay particles. In the alkaline solution (pH = 9.0), the removal of RhB was found to follow an adsorptive bubble separation pathway. Both processes were greatly influenced by the self-motion of MnO x motors contained in the pelagic clays.

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“…Diatomite, also named diatomaceous earth, consists of fossilized remains of diatoms, that are single-celled water plants having silica cell walls. Lightweight and high purity diatoms, due to their several well-arranged microscopic pores, have unmatched physical properties, like high permeability [34][35][36] . Diatomite is used as reinforcing fillers, filtering agents, abrasives, medicines, and insulating materials due to its low price and high abundance [37][38][39][40] .…”

mentioning

confidence: 99%

Preparation and characterization of diatomite and hydroxyapatite reinforced porous polyurethane foam biocomposites

Mustafov

Sen

Seydibeyoğlu

2020

Sci Rep

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Porous three-dimensional (3D) polyurethane-based biocomposites were produced utilizing diatomite and hydroxyapatite as fillers. Diatomite and Hydroxyapatite (HA) were utilized to reinforce the morphological, chemical, mechanical, and thermal properties of polyurethane foam (PUF). Diatomite and Hydroxyapatite were added into polyurethane at variable percentages 0, 1, 2, and 5. The mechanical properties of PUF were analyzed by the compression test. According to the compression test results, the compressive strength of the polyurethane foam is highest in the reinforced foam at 1% by weight hydroxyapatite compared to other reinforced PUFs. Scanning electron microscopy (SEM) images presented structural differences on foam by adding fillers. Functional groups of PUF were defined by Fourier Transform Infrared Spectroscopy (FTIR) and the thermal behavior of PUF was studied with Thermogravimetric Analysis (TGA). The obtained results revealed that PUF/HA biocomposites indicated higher thermal degradation than PUF/Diatomite biocomposites. The bone can be regarded as a composite substance composed of inorganic minerals mostly formed through hydroxyapatite (HA), which reinforces the bone structure and supplies mechanical strength and moreover an organic matrix consisting of type I collagen. Bone is good at self-regeneration, but the natural healing mechanism is difficult when significant bone loss, so medical implants are generally utilized to overcome the defect of bone. The temporary 3D scaffold, according to the bone tissue engineering approach, plays a significant role in controlling osteoblast functions as well as a fundamental role in guiding the new formation of bone into preferred forms 1. Scaffolds for bone regeneration serve primarily as substrates for binding and proliferation of osteogenic cells. Thus, like bone grafts, three-dimensional biodegradable materials with a porous structure were of big interest not only for their structural and composition similarities to the natural bone but also for their original functional properties, like greater surface area, and high mechanical strength 2. The most studied synthetic biodegradable polymers studied for bone tissue engineering include polylactic acid (PLA), polycaprolactones (PCL), polyglycolide (PGA), and polylactic-co-glycolic acid (PLGA) 3,4. However, when artificial biodegradable polymers are used, the right equilibrium among the rate of tissue regeneration and in vivo degradation is hard to accomplish. For this reason, other polymers, especially polyurethanes, can be utilized to produce scaffolds for the regeneration of bone tissue. The use of polyurethane for scaffolding is probable to achieve a much wider range of morphological and mechanical characteristics compared to mostly used biodegradable polymers 5. Polyurethanes (PU) are classically produced by polyaddition reactions of isocyanates with polyols (polyalcohols). Based on the formulation, a wide property spectrum from elastomer to rigid foams are readily designed and synthesized 6-8. Currently, they are...

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One-step hydrothermal synthesis of Cu-doped MnO2 coated diatomite for degradation of methylene blue in Fenton-like system

Cited by 44 publications

References 60 publications

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Deep‐sea clays using as active Fenton catalysts for self‐propelled motors

Preparation and characterization of diatomite and hydroxyapatite reinforced porous polyurethane foam biocomposites

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One-step hydrothermal synthesis of Cu-doped MnO2 coated diatomite for degradation of methylene blue in Fenton-like system

Cited by 44 publications

References 60 publications

Cu‐ and Fe‐Incorporated Manganese Oxides (MnxOy) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Cu‐ and Fe‐Incorporated Manganese Oxides (MnxOy) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Deep‐sea clays using as active Fenton catalysts for self‐propelled motors

Preparation and characterization of diatomite and hydroxyapatite reinforced porous polyurethane foam biocomposites

Contact Info

Product

Resources

About

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells

Cu‐ and Fe‐Incorporated Manganese Oxides (Mn_xO_y) as Cathodic Catalysts for Hydrogen Peroxide Reduction (HPR) and Oxygen Reduction (OR) in Micro‐direct Methanol Fuel Cells