High-efficiency degradation of p-arsanilic acid and arsenic immobilization with iron encapsulated B/N-doped carbon nanotubes at natural solution pH

Smart windows can dynamically and adaptively adjust the light transmittance in non-energy or low-energy ways to maintain a comfortable ambient temperature, which are conducive to efficient use of energy. This work proposes a liquid crystal (LC) smart window with highly efficient near-infrared (NIR) response using carbon nanotubes grafted by biphenyl LC polymer brush (CNT-PDB) as the orientation layer. The resultant CNT-PDB polymer brush can provide the vertical orientation of LC molecules to maintain the initial transparency. At the same time, the smart window shows a rapid response to NIR light, which can quickly adjust the light transmittance to prevent sunlight from entering the room. Different from common doping systems, this method avoids the problem of poor compatibility between the LC host and photothermal conversion materials, which is beneficial for improving the durability of the device.

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Red Mud-Based Polyaluminum Ferric Chloride Flocculant: Preparation, Characterization and Flocculation Performance

10.21203/rs.3.rs-159842/v1 ◽

2021 ◽

Author(s):

Yong Cheng ◽

Longjun Xu ◽

Chenglun Liu ◽

Zao Jiang ◽

Qiyuan Zhang ◽

...

Keyword(s):

Red Mud ◽

High Efficiency ◽

Low Cost ◽

Oxygen Demand ◽

Industrial Applications ◽

Iron Chloride ◽

Raw Material ◽

Molar Ratio ◽

Polymerization Temperature ◽

Solution Ph

Abstract In this work, red mud was used as raw material to extract Al and Fe with hydrochloric acid. The high-efficiency polyaluminum iron chloride (PAFC) flocculant was prepared via adjusting the pH of the leaching solution, the molar ratio of aluminum and iron, and the polymerization temperature. The effect of synthesis and flocculation conditions on the flocculation performance of aged landfill leachate was investigated. The results confirmed that the PAFC prepared at the polymerization pH of 2.5, the Al/Fe molar ratio of 8, and the polymerization temperature of 70 °C had the optimum flocculation effect. The flocculation consequences of PAFC and commercial polyaluminum iron chloride flocculant (CPAFC) under different flocculation conditions were compared. The chemical oxygen demand (COD), UV254, chroma and settlement height of PAFC at flocculant concentration of 60 g/L and solution pH of 6 were 72.2%, 79.2%, 82.9% and 9.5 cm (within 90 min), respectively. PAFC has excellent flocculation performance and can be used as a simple, potentially low-cost wastewater treatment agent in industrial applications.

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Manganese Deposition Content in Carbon Nanotubes Based Filters: Energy Dispersive X-ray and Rutherford Backscatter Spectrometry Investigations

Nanoarchitectonics ◽

10.37256/nat.222021961 ◽

2021 ◽

pp. 108-116

Author(s):

Emad M. Elsehly

Keyword(s):

Carbon Nanotubes ◽

Manganese Content ◽

Energy Dispersive ◽

Rutherford Backscatter Spectrometry ◽

Manganese Concentration ◽

Diameter Distribution ◽

Ambient Conditions ◽

Solution Ph ◽

X Ray ◽

Functionalized Mwcnts

Carbon nanotubes (CNTs) based filters have a prospective advantage compared to the commercial filters due to their lightweight and ability to work without electricity or heat. The manganese (Mn) removal from aqueous solutions by oxidized multi-walled carbon nanotubes (O-MWCNTs) was investigated. The filtration performance was studied under ambient conditions: the solution pH, the initial manganese concentration, and the MWCNT-filter mass. The samples of MWCNT-filters were investigated using energy dispersive X-ray spectroscopy (EDS) and rutherford backscatter spectrometry (RBS) to account for the manganese content within the MWCNT-filter. These techniques were conducted to study the oxidation effect on the morphology of MWCNTs and evaluate the oxygen functional groups and the average diameter distribution. Based on these examinations, the competence of Mn removal may exceed 91% for 50 ppm initial concentration of Mn, proposing that functionalized MWCNTs is a promising filter. The Mn removal was achieved at low pH with removal enhancement at the pH of 2. Functionalized MWCNTs based filters are promising candidate for heavy metal ions removal from industrial wastewater.

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Fenton Degradation of Ofloxacin Using a Montmorillonite-Fe3O4 Composite

Chemistry Proceedings ◽

10.3390/eccs2020-07528 ◽

2020 ◽

Vol 2 (1) ◽

pp. 32

Author(s):

Alamri Rahmah Dhahawi Ahmad ◽

Saifullahi Shehu Imam ◽

Wen Da Oh ◽

Rohana Adnan

Keyword(s):

Electron Microscope ◽

Photoelectron Spectroscopy ◽

High Efficiency ◽

Solar Irradiation ◽

Precipitation Process ◽

Wastewater Remediation ◽

Solution Ph ◽

X Ray ◽

Subsequent Degradation ◽

Co Precipitation

In this work, FeM composites consisting of montmorillonite and variable amounts of Fe3O4 were successfully synthesized via a facile co-precipitation process. They were characterized using X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscope (FESEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), N2 adsorption-desorption, and Fourier transform infrared spectroscopy (FT-IR) techniques to explain the effect of Fe3O4 content on the physicochemical properties of the Fe3O4-montmorillonite (FeM) composites. The FeM composites were subsequently used as heterogeneous Fenton catalysts to activate green oxidant (H2O2) for the subsequent degradation of ofloxacin (OFL) antibiotic. The efficiency of the FeM composites was studied by varying various parameters of Fe3O4 loading on montmorillonite, catalyst dosage, initial solution pH, initial OFL concentration, different oxidants, H2O2 dosage, reaction temperature, inorganic salts, and solar irradiation. Under the conditions of 0.75 g/L FeM-10, 5 mL/L H2O2, and natural pH, almost 81% of 50 mg/L of OFL was removed within 120 min in the dark, while total organic carbon (TOC) reduction was about 56%. Moreover, the FeM-10 composite maintained high efficiency and was stable even after four continuous cycles, making it a promising candidate in real wastewater remediation.

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High efficiency Pt-CeO2/carbon nanotubes hybrid composite as an anode electrocatalyst for direct methanol fuel cells

Journal of Power Sources ◽

10.1016/j.jpowsour.2009.08.106 ◽

2010 ◽

Vol 195 (6) ◽

pp. 1605-1609 ◽

Cited By ~ 59

Author(s):

Yu Zhou ◽

Yanfang Gao ◽

Yuchen Liu ◽

Jinrong Liu

Keyword(s):

Carbon Nanotubes ◽

Fuel Cells ◽

Hybrid Composite ◽

High Efficiency ◽

Direct Methanol Fuel Cells ◽

Direct Methanol ◽

Methanol Fuel Cells

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Modification of Multilayer Carbon Nanotubes for the Removal of Arsenate

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2016.11897 ◽

2016 ◽

Vol 16 (4) ◽

pp. 3835-3840

Author(s):

Libing Liao ◽

Gin-Lung Liu ◽

Jiin-Shuh Jean ◽

Wei-Teh Jiang ◽

Zhaohui Li

Keyword(s):

Carbon Nanotubes ◽

Contact Time ◽

Carbon Adsorbent ◽

Superior Performance ◽

Solution Ph ◽

Nano Composite ◽

X Ray ◽

Multilayer Carbon Nanotubes ◽

Removal Of Arsenic ◽

Composite Carbon

The aim of this study was to explore a new nano-composite carbon adsorbent material for the removal of arsenic from water. The multilayer carbon nanotubes (MCNTs) were treated with different acids and/or modified with iron to create more surface COOH sites or Fe-impregnated MCNTs for the enhanced uptake of As(V). Tests were conducted as a function of initial As(V) concentrations, contact time, and solution pH. The coverage of ferric hydroxides on MCNTs and the uptake of As on Fe-MCNTs were independently confirmed by field emission scanning electron microscope and energy dispersive X-ray spectroscopy analyses. With an As(V) uptake capacities of 27 mg/g on Fe-MCNTs and 14 mg/g on acid-MCNTs, the material showed superior performance for As(V) removal.

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