Bio-adsorbent derived from papaya peel waste and magnetic nanoparticles fabricated for lead determination

2018 ◽  
Vol 90 (1) ◽  
pp. 79-92 ◽  
Author(s):  
Sahar Abbaszadeh ◽  
Hamid Rashidi Nodeh ◽  
Sharifah Rafidah Wan Alwi
Keyword(s):  
Waste Water ◽  
Magnetic Nanoparticles ◽  
Solid Phase ◽  
Tap Water ◽  
Lead Ions ◽  
Coefficient Of Determination ◽  
One Pot ◽  
X Ray ◽  
Lead Determination ◽  
Flame Atomic Absorption

AbstractDetermination of toxic lead ions at trace level using solid-based adsorbents has become of interest in recent years. In this work, a novel bio-adsorbent originating from papaya peel waste (PPw) and magnetic nanoparticles (Fe3O4) was developed (Fe3O4/PPw). The new adsorbent was prepared using a one-pot green method and characterized by Fourier transform infrared, X-ray diffractometer, energy-dispersive X-ray spectroscopy and field emission scanning electron microscopy. The synthesized Fe3O4/PPw was used as a magnetic solid-phase extraction (MSPE) sorbent for extraction of lead ions from waste water prior to assessing by flame atomic absorption spectroscopy. The parameters influencing extraction recovery, including desorption solvent, solvent volume, sample volume, extraction time, desorption time, adsorbent dosage, salt effect and pH were optimized. A linear response for the MSPE method was achieved at concentrations from 10 to 100 ng mL−1 with a good coefficient of determination (R2=0.9987). Detection limits and quantitation limit of the MSPE method were observed around 2 ng mL−1 and 6.6 ng mL−1, respectively. The intraday and interday precision (%RSD) was in the range 1.6%–4.5% and 2.3%–7.4%, respectively. The recovery amounts obtained were 91% for tap water, 85.9% for river water and 86% for waste water. The synthesized adsorbent showed a minimum reusability of eight cycles without significant change in the lead determination. The results proved that the new bio-adsorbent (Fe3O4/PPw) is potentially capable to extract the Pb(II) from aqueous media under optimum conditions with a high extraction efficiency.

scholarly journals Carbon and Tin-Based Polyacrylonitrile Hybrid Architecture Solid Phase Microextraction Fiber for the Detection and Quantification of Antibiotic Compounds in Aqueous Environmental Systems

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1670 ◽  
Author(s):  
Sandip Mondal ◽  
Jialing Jiang ◽  
Yin Li ◽  
Gangfeng Ouyang
Keyword(s):  
Solid Phase Microextraction ◽  
Tin Dioxide ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Tap Water ◽  
Coefficient Of Determination ◽  
Lower Amount ◽  
Custom Made ◽  
Relative Standard ◽  
Detection And Quantification

In this study, the detection and quantification of multiple classes of antibiotics in water matrices are proposed using a lab-made solid phase microextraction (SPME) fiber coupled with high-performance liquid chromatography-tandem mass spectrometry (LC-MS/MS). The lab-made fiber was prepared using a graphene oxide (G), carbon nanotubes (C), and tin dioxide (T) composite, namely GCT, with polyacrylonitrile (PAN) as supporting material. The detected antibiotics were enrofloxacin, sulfathiazole, erythromycin, and trimethoprim. The custom-made fiber was found to be superior compared with a commercial C18 fiber. The excellent reproducibility and lower intra-fiber relative standard deviations (RSDs 1.8% to 6.8%) and inter-fiber RSDs (4.5% to 8.8%) made it an ideal candidate for the detection of traces of antibiotics in real environmental samples. The proposed validated method provides a satisfactory limit of detection and good linear ranges with higher (>0.99) coefficient of determination in the aqueous system. Application of the method was made in different real water systems such as river, pond and tap water using the standard spiking method. Excellent sensitivity, reproducibility, lower amount of sample detection and higher recovery was found in a real water sample. Therefore, the extraction method was successfully applied to the detection and quantification of multiple classes of antibiotics in different aqueous systems with satisfactory results.

scholarly journals Magnetic γFe2O3@Sh@Cu2O: an efficient solid-phase catalyst for reducing agent and base-free click synthesis of 1,4-disubstituted-1,2,3-triazoles

BMC Chemistry ◽  
2020 ◽  
Vol 14 (1) ◽  
Author(s):  
Fereshteh Norouzi ◽  
Shahrzad Javanshir
Keyword(s):  
Photoelectron Spectroscopy ◽  
Inductively Coupled Plasma ◽  
Solid Phase ◽  
Click Reaction ◽  
Copper Acetate ◽  
Reducing Agent ◽  
Gravimetric Analysis ◽  
High Turnover ◽  
One Pot ◽  
X Ray

AbstractA hybrid magnetic material γFe2O3@Sh@cu2O was easily prepared from Shilajit (Sh) decorated Fe3O4 and copper acetate. The prepared magnetic hybrid material was fully characterized using different analysis, including Fourier transform infrared (FT-IR), X-ray diffraction (XRD), inductively coupled plasma (ICP), scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM) thermal gravimetric analysis (TGA) and Brunauer–Emmett–Teller (BET). All these analysis revealed that during coating of Fe3O4@Sh using copper salt (II), synchronized redox sorption of CuII to CuI occurs at the same time as the oxidation of Fe3O4 to γFe2O3. This magnetic catalyst exhibited excellent catalytic activity for regioselective synthesis of 1,4-disubstituted-1,2,3-triazoles via one pot three-component click reaction of sodium azide, terminal alkynes and benzyl halides in the absence of any reducing agent. High yields, short reaction time, high turnover number and frequency (TON = 3.5 * 105 and TOF = 1.0 * 106 h−1 respectively), easy separation, and efficient recycling of the catalyst are the strengths of the present method.

Solid-Phase Extraction Method for Preconcentration/Separation of Zinc Ion in Tap Water and Human Urine Using Organo-Bentonite Modified by Dithizone

2011 ◽  
Vol 230-232 ◽  
pp. 892-895
Author(s):  
Dong Zhang ◽  
Yan Li Zhang
Keyword(s):  
Human Urine ◽  
Contact Time ◽  
Ph Value ◽  
Solid Phase ◽  
Tap Water ◽  
Absorption Spectrometry ◽  
Zinc Ion ◽  
Good Tolerance ◽  
Flame Atomic Absorption ◽  
Experimental Parameters

A new method was proposed for the preconcentration/separation of zinc at trace levels using a modified organo-bentonite with dithizone (D-O-bentonite) and determined by flame atomic absorption spectrometry (FAAS). The influences of some experimental parameters including pH of the sample solution, contact time, and volume of eluent have been investigated. The influences of some matrix elements were also examined. The results show that the zinc ion could be adsorbed on the D-O-bentonite. The adsorbed quantitively was affected by the pH value of medium and contact time. In the medium of pH 4-5, the contact time was 20 min, and capacity of adsorption was 32.0 mg·g-1. The zinc adsorbed on the sorbent could be completely eluated by using 0.5 mol·L-1 HNO3. The method has a good tolerance to matrix interference. The detection limit of the method for zinc ion was 0.013 µg·L-1. The method was successfully applied to the pre-concentration/separation of zinc ion in the tap water and human urine with satisfactory results.

A one-pot synthesis and X-ray crystallographic and computational analyses of methyl-2,4-dimethoxysalicylate — a potential anti-tumour agent

2004 ◽  
Vol 82 (7) ◽  
pp. 1179-1185 ◽  
Author(s):  
Hossein A Dabbagh ◽  
Nader Noroozi-Pesyan ◽  
Brian O Patrick ◽  
Brian R James
Keyword(s):  
Hydrogen Bonds ◽  
Solid Phase ◽  
Carbonyl Oxygen ◽  
One Pot ◽  
Oh Groups ◽  
X Ray ◽  
A Value ◽  
Intramolecular Hydrogen ◽  
Computational Analyses ◽  
Thermal Decarboxylation

The thermal decarboxylation of 2-methoxycarbonyl-5-(4′-nitrophen-oxy)tetrazole (1a) with the electron-rich, aromatic compounds (anisole, N,N-dimethylaniline, 1,4-dimethoxybenzene, and 1,3,5-trimethoxybenzene), neat or in polar solvents (DMSO, DMF, and CH3CN), is investigated. The solid phase thermal decomposition of a mixture of 1a, 1,3,5-trimethoxybenzene, and a Lewis acid (AlCl3) produces methyl-2,4-dimethoxysalicylate (8) in good yield, instead of the expected 2,4,6-trimethoxybenzoic acid. The X-ray structure of 8 shows intramolecular hydrogen bonds between the carbonyl oxygen and hydrogens of Me and OH groups. A measured pKa value of 6.8 compares well with a value of 6.4 estimated using the [C=O···H···O] hydrogen bond distances.Key words: anti–tumor, novel synthesis, X-ray structure, hydrogen bonds, computational analysis.

Separation and Enrichment of Gold in Water, Geological and Environmental Samples by Solid Phase Extraction on Multiwalled Carbon Nanotubes Prior to its Determination by Flame Atomic Absorption Spectrometry

2015 ◽  
Vol 98 (6) ◽  
pp. 1733-1738 ◽  
Author(s):  
Ali Duran ◽  
Mustafa Tuzen ◽  
Mustafa Soylak
Keyword(s):  
Carbon Nanotubes ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Solid Phase ◽  
Tap Water ◽  
Absorption Spectrometry ◽  
Solid Sorbent ◽  
Flame Atomic Absorption ◽  
Digestion Technique

Abstract This study proposes the application of multi-walled carbon nanotubes as a solid sorbent for the preconcentration of gold prior to its flame atomic absorption spectrometry determination. Extraction was achieved by using a glass column (15.0 cm in length and 1.0 cm in diameter). Quantitative recoveries were obtained in the pH range of 2.5–4.0; the elution step was carried out with 5.0 ml of 1.0 mol/L HNO3 in acetone. In the ligand-free study, variables such as pH, eluent type, sample volume, flow rates, and matrix effect were examined for the optimum recovery of gold ions. The gold ions were able to be pre-concentrated by a factor of 150 and their LOD was determined to be 1.71 μg/L. In order to evaluate the accuracy of the developed method, addition-recovery tests were applied for the tap water, mineral water, and sea water samples. Gold recovery studies were implemented using a wet digestion technique for mine and soil samples taken from various media, and this method was also applied for anodic slime samples taken from the factories located in the Kayseri Industrial Zone of Turkey.

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