Controlled Synthesis of Visible Light Active CuxS Photocatalyst: The Effect of Heat Treatment on Their Adsorption Capacity and Photoactivity

The effects of different precursor salts, stabilizing agents, and heat treatment parameters are already known to have an influence on the synthesis of nano-sized semiconductors in heterogenous photocatalysis. In the present work, CuxS materials were prepared by using different precursors (copper (II) chloride dihydrate or copper (II) acetate monohydrate) and shape tailoring/stabilizing agents, such as ethylenediaminetetraacetic acid/polyvinylpyrrolidone, and thiourea as the sulfur source. The polyvinylpyrrolidone (PVP) kinetically controlled the growth rate of the nanoplates, while ethylenediaminetetraacetic acid (EDTA) adjusted the nucleation process through the complexation of copper. A one-step hydrothermal method was used for the synthesis, and the materials were characterized by means of morphological and structural complementary investigation methods. Furthermore, the adsorption capacity and photocatalytic activity were also measured for these materials. It was found that the vacancy sites formed by changing the precursor salt, as confirmed by Raman measurements, affect the photocatalytic activity. The rise of the specific surface area was achieved by heat treatment, and concomitantly, the adsorption capacity of the treated samples was found to increase likewise.

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Effects of Heat Treatment Temperature on Photocatalytic Activity of TiO2/SiO2 Composite Aerogels

Journal of Inorganic Materials ◽

10.3724/sp.j.1077.2012.11781 ◽

2013 ◽

Vol 27 (10) ◽

pp. 1079-1083

Author(s):

Zhao-Hui LIU ◽

Gen-Liang HOU ◽

Xun-Jia SU ◽

Feng GUO ◽

Zhou XIAO ◽

...

Keyword(s):

Heat Treatment ◽

Photocatalytic Activity ◽

Heat Treatment Temperature ◽

Treatment Temperature ◽

Composite Aerogels

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Heat Treatment-Based One-Step Preparation of Highly Concentrated, Well-Stable Silver Colloids that Can Form Stable Films on Bare Electrodes for H2O2 Detection

Current Nanoscience ◽

10.2174/157341312800620223 ◽

2012 ◽

Vol 8 (3) ◽

pp. 335-342 ◽

Cited By ~ 2

Author(s):

Xuping Sun ◽

Xiaoyun Qin ◽

Jianming Hu ◽

Yonglan Luo ◽

Wenbo Lu ◽

...

Keyword(s):

Heat Treatment ◽

Silver Colloids ◽

H2o2 Detection ◽

One Step

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One-step synthesis of nitrogen-grafted copper-gallic acid for enhanced methylene blue removal

Scientific Reports ◽

10.1038/s41598-021-91484-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Shella Permatasari Santoso ◽

Vania Bundjaja ◽

Artik Elisa Angkawijaya ◽

Chintya Gunarto ◽

Alchris Woo Go ◽

...

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Gallic Acid ◽

Synthesis Method ◽

Molar Ratio ◽

X Ray Diffraction ◽

Temperature Dependent ◽

One Step ◽

Detailed Assessment ◽

Higher Temperature

AbstractNitrogen-grafting through the addition of glycine (Gly) was performed on a metal- phenolic network (MPN) of copper (Cu2+) and gallic acid (GA) to increase its adsorption capacity. Herein, we reported a one-step synthesis method of MPN, which was developed according to the metal–ligand complexation principle. The nitrogen grafted CuGA (Ng-CuGA) MPN was obtained by reacting Cu2+, GA, and Gly in an aqueous solution at a molar ratio of 1:1:1 and a pH of 8. Several physicochemical measurements, such as Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), N2 sorption, X-ray diffraction (XRD), and thermal gravimetry analysis (TGA), were done on Ng-CuGA to elucidate its characteristics. The analysis revealed that the Ng-CuGA has non-uniform spherical shaped morphology with a pore volume of 0.56 cc/g, a pore size of 23.25 nm, and thermal stability up to 205 °C. The applicational potential of the Ng-CuGA was determined based on its adsorption capacity against methylene blue (MB). The Ng-CuGA was able to adsorb 190.81 mg MB per g adsorbent at a pH of 6 and temperature of 30 °C, which is 1.53 times higher than the non-grafted CuGA. Detailed assessment of Ng-CuGA adsorption properties revealed their pH- and temperature-dependent nature. The adsorption capacity and affinity were found to decrease at a higher temperature, demonstrating the exothermic adsorption behavior.

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Hydrothermal Synthesis of Sodalite-Type N-A-S-H from Fly Ash to Remove Ammonium and Phosphorus from Water

Materials ◽

10.3390/ma14112741 ◽

2021 ◽

Vol 14 (11) ◽

pp. 2741

Author(s):

Pengcheng Lv ◽

Ruihong Meng ◽

Zhongyang Mao ◽

Min Deng

Keyword(s):

Fly Ash ◽

Adsorption Capacity ◽

Removal Rate ◽

Kinetic Studies ◽

Solute Concentration ◽

Raw Material ◽

Sodium Aluminosilicate ◽

Equilibrium Data ◽

One Step ◽

Ft Ir

In this study, the hydrated sodium aluminosilicate material was synthesized by one-step hydrothermal alkaline desilication using fly ash (FA) as raw material. The synthesized materials were characterized by XRD, XRF, FT-IR and SEM. The characterization results showed that the alkali-soluble desilication successfully had synthesized the sodium aluminosilicate crystalline (N-A-S-H) phase of sodalite-type (SOD), and the modified material had good ionic affinity and adsorption capacity. In order to figure out the suitability of SOD as an adsorbent for the removal of ammonium and phosphorus from wastewater, the effects of material dosing, contact time, ambient pH and initial solute concentration on the simultaneous removal of ammonium and phosphorus are investigated by intermittent adsorption tests. Under the optimal adsorption conditions, the removal rate of ammonium was 73.3%, the removal rate of phosphate was 85.8% and the unit adsorption capacity reached 9.15 mg/L and 2.14 mg/L, respectively. Adsorption kinetic studies showed that the adsorption of ammonium and phosphorus by SOD was consistent with a quasi-secondary kinetic model. The adsorption isotherm analysis showed that the equilibrium data were in good agreement with the Langmuir and Freundlich model. According to thermodynamic calculations, the adsorption of ammonium and phosphorus was found to be a heat-absorbing and spontaneous process. Therefore, the preparation of SOD by modified FA has good adsorption properties as adsorbent and has excellent potential for application in the removal of contaminants from wastewater.

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One‐step ultrasonic production of the chitosan/lactose/ g‐C 3 N 4 nanocomposites with lactose as a biological capping agent: Photocatalytic activity study

Journal of the Chinese Chemical Society ◽

10.1002/jccs.202000496 ◽

2021 ◽

Author(s):

Mohammad Ali Karimi ◽

Mehdi Ranjbar ◽

Alireza Mohadesi

Keyword(s):

Photocatalytic Activity ◽

Capping Agent ◽

One Step

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Enhanced sunlight photocatalytic activity and biosafety of marine-driven synthesized cerium oxide nanoparticles

Scientific Reports ◽

10.1038/s41598-021-94327-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Somayeh Safat ◽

Foad Buazar ◽

Salim Albukhaty ◽

Soheila Matroodi

Keyword(s):

Photocatalytic Activity ◽

Band Gap ◽

Color Change ◽

Removal Rate ◽

Average Crystallite Size ◽

Face Centered Cubic ◽

One Pot ◽

Stabilizing Agents ◽

Face Centered ◽

Living Organisms

AbstractThis contribution presents the biosynthesis, physiochemical properties, toxicity and photocatalytic activity of biogenic CeO2 NPs using, for the first time, marine oyster extract as an effective and rich source of bioreducing and capping/stabilizing agents in a one-pot recipe. CeO2 NPs formation was initially confirmed through the color change from light green to pale yellow and subsequently, their corresponding absorption peak was spectroscopically determined at 310 nm with an optical band-gap of 4.67 eV using the DR-UV technique. Further, XRD and Raman analyses indicated that nanoceria possessed face-centered cubic arrangements without any impurities, having an average crystallite size of 10 nm. TEM and SEM results revealed that biogenic CeO2 NPs was approximately spherical in shape with a median particle size of 15 ± 1 nm. The presence of various bioorganic substances on the surface of nanoparticles was deduced by FTIR and TGA results. It is found that marine-based nanoceria shows no cytotoxic effect on the normal cell, thus indicating their enhanced biocompatibility and biosafety to living organisms. Environmentally, due to energy band gap, visible light-activated CeO2 nanocatalyst revealed superior photocatalytic performance on degradation of methylene blue pollutant with removal rate of 99%. Owing to the simplicity, cost-effectiveness, and environmentally friendly nature, this novel marine biosynthetic route paves the way for prospective applications of nanoparticles in various areas.

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