An azo-phenol derivative probe: colorimetric and “turn-on” fluorescent detection of copper(ii) ions and pH value in aqueous solution

Magnesium hydroxide (Mg(OH)2) thin films were deposited by the drop-dry deposition (DDD) method using an aqueous solution containing Mg(NO3)2 and NaOH. DDD was performed by dropping the solution on a substrate, heating-drying, and rinsing in water. Effects of different deposition conditions on the surface morphology and optical properties of Mg(OH)2 thin films were researched. Films with a thickness of 1−2 μm were successfully deposited, and the Raman peaks of Mg(OH)2 were observed for them. Their transmittance in the visible range was 95% or more, and the bandgap was about 5.8 eV. It was found that the thin films have resistivity of the order of 105 Ωcm. Thus, the transparent and semiconducting Mg(OH)2 thin films were successfully prepared by DDD.

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Selenium in wastewater can be adsorbed by modified natural zeolite and reused in vegetable growth

Science Progress ◽

10.1177/00368504211019845 ◽

2021 ◽

Vol 104 (2) ◽

pp. 003685042110198

Author(s):

Xiao Zhang ◽

Xinyuan Li ◽

Zihao Jin ◽

Sadam Hussain Tumrani ◽

Xiaodong Ji

Keyword(s):

Aqueous Solution ◽

Ph Value ◽

Soil Improvement ◽

Pollutant Removal ◽

Maximum Adsorption Capacity ◽

Selenium Content ◽

Water Release ◽

Soil Release ◽

Release Ratio ◽

Water Pollutant

Modified natural zeolites (MNZ) are widely used in pollutant removal, but how to address these MNZ that have adsorbed pollutants must be considered. Selenium is an essential trace element for metabolism and is also a water pollutant. Selenium is adsorbed in the water by MNZ in this study first. Then the Brassica chinensis L. was planted in the soil which contains the MNZ loaded with selenium (MNZ-Se) to explore selenium uptake. MNZ-Se release tests in water and soil were also considered. The results showed the following: (1) The maximum adsorption capacity of MNZ for selenium is 46.90 mg/g. (2) Water release experiments of MNZ-Se showed that regardless of how the pH of the aqueous solution changes, the trend of the release of selenium from MNZ-Se in aqueous solution is not affected and first decreases before stabilizing. (3) Soil release experiments of MNZ-Se showed that the selenium content in the soil increased and reached the concentration in the standard of selenium-rich soil. Addition amount and soil pH value will affect the release ratio. The release ratio of MNZ-Se in the water was higher than that in the soil. (4) With an increase in the soil MNZ-Se content, the selenium content in the soil and B. c increases. Above all, MZN can be a good medium for water pollutant removal and soil improvement.

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Removal of Phenol from Aqueous Solution Using Internal Microelectrolysis with Fe-Cu: Optimization and Application on Real Coking Wastewater

Processes ◽

10.3390/pr9040720 ◽

2021 ◽

Vol 9 (4) ◽

pp. 720

Author(s):

Do Tra Huong ◽

Nguyen Van Tu ◽

Duong Thi Tu Anh ◽

Nguyen Anh Tien ◽

Tran Thi Kim Ngan ◽

...

Keyword(s):

Aqueous Solution ◽

Ph Value ◽

Reaction Rate Constant ◽

Phenol Concentration ◽

Treated Wastewater ◽

Coking Wastewater ◽

X Ray ◽

Chemical Plating ◽

Internal Electrolysis ◽

Phenol Decomposition

Fe-Cu materials were synthesized using the chemical plating method from Fe powder and CuSO4 5% solution and then characterized for surface morphology, composition and structure by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD), respectively. The as-synthesized Fe-Cu material was used for removal of phenol from aqueous solution by internal microelectrolysis. The internal electrolysis-induced phenol decomposition was then studied with respect to various parameters such as pH, time, Fe-Cu material weight, phenol concentration and shaking speed. The optimal phenol decomposition (92.7%) was achieved under the conditions of (1) a pH value of phenol solution of 3, (2) 12 h of shaking at the speed of 200 rpm, (3) Fe-Cu material weight of 10 g/L, (4) initial phenol concentration of 100.98 mg/L and (5) at room temperature (25 ± 0.5 °C). The degradation of phenol using Fe-Cu materials obeyed the second-order apparent kinetics equation with a reaction rate constant of k of 0.009 h−1L mg−1. The optimal process was then tested against real coking wastewater samples, resulting in treated wastewater with favorable water indicators. Current findings justify the use of Fe-Cu materials in practical internal electrolysis processes.

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Adsorption Characteristics of Phenol in Aqueous Solution by Pinus massoniana Biochar

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.295-298.1154 ◽

2013 ◽

Vol 295-298 ◽

pp. 1154-1160 ◽

Cited By ~ 3

Author(s):

Guo Zhi Deng ◽

Xue Yuan Wang ◽

Xian Yang Shi ◽

Qian Qian Hong

Keyword(s):

Aqueous Solution ◽

Ph Value ◽

Pinus Massoniana ◽

Isotherm Models ◽

Order Kinetic ◽

Adsorbent Dosage ◽

Salt Ions ◽

Equilibrium Data ◽

Order Kinetic Model ◽

Pseudo Second Order

The objective of this paper is to investigate the feasibility of phenol adsorption from aqueous solution by Pinus massoniana biochar. Adsorption conditions, including contact time, initial phenol concentration, adsorbent dosage, strength of salt ions and pH, have been investigated by batch experiments. Equilibrium can be reached in 24 h for phenol from 50 to 250 mg• L-1. The optimum pH value for this kind of biochar is 5.0. The amount of phenol adsorbed per unit decreases with the increase in adsorbent dosage. The existence of salt ions makes negligible influence on the equilibrium adsorption capacity. The experimental data is analyzed by the Freundlich and Langmuir isotherm models. Equilibrium data fits well to the Freundlich model. Adsorption kinetics models are deduced and the pseudo-second-order kinetic model provides a good correlation for the adsorbent process. The results show that the Pinus massoniana biochar can be utilized as an effective adsorption material for the removal of phenol from aqueous solution.

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Microwave-assisted synthesis of BSA-stabilised gold nanoclusters for the sensitive and selective detection of lead(ii) and melamine in aqueous solution

RSC Advances ◽

10.1039/c6ra16043c ◽

2016 ◽

Vol 6 (82) ◽

pp. 79020-79027 ◽

Cited By ~ 9

Author(s):

Che-Yu Lee ◽

Nai-Yueh Hsu ◽

Mei-Yao Wu ◽

Yang-Wei Lin

Keyword(s):

Aqueous Solution ◽

Gold Nanoclusters ◽

Microwave Assisted Synthesis ◽

Selective Detection ◽

Microwave Assisted ◽

Turn On

MW-assisted synthesis of fluorescent BSA-AuNCs for the turn-off sensing of Pb(ii) and turn-on sensing of melamine.

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Phthalate degradation by glow discharge plasma enhanced with pyrite in aqueous solution

Water Science & Technology ◽

10.2166/wst.2016.316 ◽

2016 ◽

Vol 74 (6) ◽

pp. 1365-1375 ◽

Cited By ~ 3

Author(s):

Chensi Shen ◽

Shaoshuai Wu ◽

Hui Chen ◽

Sadia Rashid ◽

Yuezhong Wen

Keyword(s):

Aqueous Solution ◽

Energy Efficiency ◽

Glow Discharge ◽

Discharge Plasma ◽

Ph Value ◽

Glow Discharge Plasma ◽

Methyl Tert Butyl Ether ◽

Butyl Ether ◽

Polymeric Compound ◽

X Ray

In order to prevent health risk from potential exposures to phthalates, a glow discharge plasma (GDP) process was applied for phthalate degradation in aqueous solution. The results revealed that the phthalate derivatives 4-hydroxyphthalic acid, 4-methylphthalic acid and 4-tert-butylphthalic anhydride could be degraded efficiently in GDP process (498 V, 0.2 A) with high removal efficiencies of over 99% in 60 minutes. Additionally, pyrite as a promising heterogeneous iron source in the Fenton reaction was found to be favorable for GDP process. The phthalate degradation reaction could be significantly enhanced by the continuous formation of •OH and the inhibition of the quenching reaction in the pyrite Fenton system due to the constant dissolution of Fe(II) from pyrite surface. Meanwhile, the initial pH value showed little impact on the degradation of phthalates and the energy efficiency of GDP system for phthalate degradation ranged between 0.280 × 10−9 and 1.210 × 10−9 mol/J, which is similar to the GDP system with phenol, bisphenol A and methyl tert-butyl ether as the substrates. Further, the X-ray diffraction and scanning electron microscopy with energy dispersive X-ray spectroscopy analyses indicated that the pyrite was relatively stable in GDP system and there was no obvious polymeric compound formed on the catalyst surface. Overall, this GDP process offers high removal efficiency, simple technology, considerable energy efficiency and the applicability to salt-containing phthalate wastewater.

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Preliminary Study on the Use of Ozonation for the Degradation of Dithiocarbamate Residues in the Fruit Drying Process: Mancozeb Residue in Blackcurrant is the Example Used

Journal of Plant Protection Research ◽

10.2478/jppr-2013-0007 ◽

2013 ◽

Vol 53 (1) ◽

pp. 48-52 ◽

Cited By ~ 8

Author(s):

Piotr Antos ◽

Anna Kurdziel ◽

Stanisław Sadło ◽

Maciej Balawejder

Keyword(s):

Aqueous Solution ◽

Ozone Concentration ◽

Gaseous Phase ◽

Plant Material ◽

Water Solution ◽

Ozone Treatment ◽

Drying Process ◽

Initial Concentration ◽

Preliminary Study ◽

Treatment Procedures

Abstract In order to reduce the level of dithiocarbamate fungicide mancozeb residues in blackcurrants, two different ozone treatment procedures were evaluated. The first one entailed washing the plant material with an aqueous solution of ozone. This ozone enriched water solution allowed for a 59% reduction of mancozeb residues, compared with the initial concentration. The latter method was based on the utilization of ozone in a gaseous phase combined with a drying process. In that procedure, samples of blackcurrant fruit were exposed to a 19 ppm ozone concentration, and then the blackcurrants were dried. The utilization of ozone in a gaseous phase permitted a 38% reduction of mancozeb residues, in comparison with the initial concentration. As a result of the combination of both processes; ozonation and drying, a 58% reduction of mancozeb residues was achieved.

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Demicellization of Polyethylene Oxide in Water Solution under Static Magnetic Field Exposure Studied by FTIR Spectroscopy

Advances in Physical Chemistry ◽

10.1155/2013/485865 ◽

2013 ◽

Vol 2013 ◽

pp. 1-8 ◽

Cited By ~ 17

Author(s):

Emanuele Calabrò ◽

Salvatore Magazù

Keyword(s):

Magnetic Field ◽

Aqueous Solution ◽

Ftir Spectroscopy ◽

Static Magnetic Field ◽

Polyethylene Oxide ◽

Water Solution ◽

Infrared Region ◽

Bending Vibrations ◽

Field Exposure ◽

Methylene Groups

FTIR spectroscopy was used to investigate the alterations of the vibration bands in the mid-infrared region of Polyethylene oxide in aqueous solution at 25 mg/mL concentration under exposure up to 4 h to a static magnetic field at 200 mT. FTIR spectroscopic analysis of PEO solution in the range 3500–1000 cm−1 evidenced the stretching vibrations of ether band, C–H symmetric-antisymmetric and bending vibrations of methylene groups, and the C–O–C stretching band. A significant decrease in intensity of symmetric and asymmetric stretching CH2 vibration bands occurred after 2 h and 4 h of exposure, followed by a significant decrease in intensity of scissoring bending in plane CH2 vibration around 1465 cm−1. Finally, the C–O–C stretching band around 1080 cm−1 increased in intensity after 4 h of exposure. This result can be attributed to the increase of formation of the intermolecular hydrogen bonding that occurred in PEO aqueous solution after SMF exposure, due to the reorientation of PEO chain after exposure to SMF. In this scenario, the observed decrease in intensity of CH2 vibration bands can be understood as well considering that the reorientation of PEO chain under the applied SMF induces PEO demicellization.

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