Open Access Article – Removal of Formaldehyde from the Indoor Environment Using Porous Carbons and Silicas

Author(s):Junyi Wang and Yousheng Tao*

Volume 13, Issue 3, 2020

Page: [194 – 202]

Pages: 9

DOI: 10.2174/2405520413666200124110348


Formaldehyde, carcinogenic for humans, is a common indoor air pollutant emitting from furniture coatings and flooring materials. Porous carbon and silica materials have applications in the removal of formaldehyde because of their large specific surface areas, obedience to surface modification for enhanced adsorption of pollutants, high chemical and mechanical stabilities, and reusability. This work briefly summarized available porous carbon and silica materials for the removal of formaldehyde from the indoor environment. Read now:

Open Access Articles | Treatment of Methylene Blue and Methyl Orange Dyes in Wastewater by Grafted Titania Pillared Clay Membranes

Author(s): Nalini Neethu, Tanushree Choudhury*.





Background: Amphoteric membranes such as Titania Pillared Clay (TiPILC) membranes exhibit different charges at different pH ranges, subsequently show efficient separation for cationic and anionic organic pollutants in wastewater based on solution pH. The structural properties of such membranes determine their permeability and selectivity to a large extent. The present work is initiated to explore the possibility of enhancing the surface area of TiPILC membranes by grafting with 3- aminopropyltriethoxysilane.

Method: Grafted TiPILC membranes were fabricated by colloidal sol- gel route followed by dip coating, drying and sintering the membranes at 300oC. X-ray diffraction (XRD) spectra of the pillared photocatalyst membranes show the presence of only anatase phase, which exhibits better photocatalytic activity. Fourier Transform Infrared (FT-IR) spectra reveal the formation of delaminated TiPILC material. The specific surface area of TiPILC membrane obtained at pH3.5 is 183m2/g.

Results: Literature survey of 47 papers was carried out for the work. 10 papers were based on Patents being dealt on degradation of organic dyes in wastewater by conventional methods, though reports of membrane technology are limited in literature. The rest 37 papers outlined the importance of widespread use of titania photocatalyst powder for degradation studies.

Conclusion: The membrane material thus developed is efficient in complete decolouration of both Methylene Blue and Methyl Orange dyes on account of the high surface charge and high surface area in just one cycle of filtration.


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Meenal Gupta

Contributed Article: “Adsorption of Cu(II) by Low Cost Adsorbents: A Review

Highlighted Article – Adsorption of Cu(II) by Low Cost Adsorbents – Current Environmental Engineering

CEE-Articles_4-3-Meenal Gupta

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Major Article Contributions by some of the Chinese Authors of Bentham Science Publishers in; ‘Current Nanoscience’

Journal Name: Current Nanoscience

Article Title:Enhanced Luminescent Properties of Solution Combustion Synthesized Nanocrystalline Y3Al5O12:Eu3+ Phosphors

Author(s): Sumei Wang, Xurong Zhao, Shengming Zhou, Limin Zhou and Guodong Xia


Nanocrystalline Y3Al5O12:Eu3+ phosphors with particle size about 20-40 nm have been synthesized by a facile solution combustion method. XRD and TEM studies show that Y3Al5O12 nanocrystals can directly form at a low temperature of 825 °C and highly crystalline at 850 °C. With the increase of annealing temperature, the charge transfer band shows a blue shift due to the dielectric confinement effect. The color purity of Y3Al5O12:Eu3+ phosphors can be improved by decreasing the grain size of nanocrystals. Furthermore, the high concentration doping of Eu3+ can be realized in Y3Al5O12 nanocrystals, which will enhance the luminescent intensity. This work demonstrated that solution combustion is a feasible method to synthesize europium rare earth doped Y3Al5O12 nanocrystals with enhanced optical properties.
Article Title: Developing of A Novel Clinical Kit for Assaying of Alpha-fetoprotein Based on Luminescent and Magnetic Nanoparticles

Author(s): Shunan Shan, Xuhua Hu, Siyu Ni, Kai Li, Jing Li and Xingping Zhou


Alpha-fetoprotein ( α-FP, AFP) was the only serological marker currently available for the detection of hepatocellular carcinoma (HCC). As a novel biological luminescent label, the favorable properties of water-soluble CdTe quantum dots (QDs) have advantages over conventional fluorescent materials. Meantime, the magnetic separation technique has widely been applied to various aspects in biotechnology in recent years. In this paper, CdTe QDs and dextran–Fe3O4 magnetic nanoparticles were both applied on immunoassay for the determination of AFP concentration. Firstly, a mouse anti-human AFP antibody (primary antibody) was immobilized on magnetic nanoparticles, which were used as solid support. Secondly, another mouse anti-human AFP antibody (secondary antibody) was attached to the surface of the CdTe QDs via electrostatic interaction. It was found that when the pH value was 6.0, the volume ratio of CdTe (3 ×10-4 mol/L) to antibody (2 mg/mL) was 50:3, and the reaction time was more than 10 min, the complex of the secondary antibody and CdTe was formed and the strongest PL intensity was obtained. Thirdly, the above two complexes were conjugated with a serial of AFP concentrations. Then the relationship between the PL intensity and the AFP concentration was determined and the calibration equation— Y=k(X-9.31)/V—was obtained. Finally, ten samples of human serum were tested based on this equation. The results, to a large extent, were consistent with those obtained by Time-resolved Fluorescence. More importantly, the current method could be applied in many other antibody-antigen systems.

Article Title: Adsorption and Removal of Sudan I, II from Organic Solutions by Oxidized Multiwalled Carbon Nanotubes

Author(s): Fei-Peng Jiao, Lei Zhou, Wei-Jie Yang, Jin-Gang Yu and Xiao-Qing Chen


Sudan dyes are toxic or carcinogenic even at low concentrations, which are illegally used as additives in food products to maintain their red color and thus stimulate sales of these products in the market recently. A facile adsorption procedure for the removal of Sudan I and II in n-hexane using oxidized multi-walled carbon nanotubes (O-MWCNTs) is presented in this paper. The effect of absorption conditions including absorption time, amount of adsorbent, initial concentration of Sudan I and II was examined. Two isotherm models were used to describe the adsorption equilibrium, while three kinetic models were applied to evaluate the adsorption process. The adsorption process and equilibrium for Sudan I and II were all proved to be fitted by the Langmuir model and second-order kinetic model. The O-MWCNTs possessed fast kinetics for Sudan I and II from n-hexane solvent with each saturation time of <30 min, and correspondingly the maximum adsorption capacities for Sudan I and II were 41.408 mg/g and 47.037 mg/g, respectively.

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