scholarly journals Preparation of Carbon Aerogel Electrode for Electrosorption of Copper Ions in Aqueous Solution

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1864 ◽  
Author(s):  
Ziling Cao ◽  
Chen Zhang ◽  
Zhuoxin Yang ◽  
Qing Qin ◽  
Zhihua Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Copper Ions ◽  
Sol Gel ◽  
Copper Ion ◽  
Carbon Aerogel ◽  
Double Layers ◽  
Molar Ratio ◽  
Adsorption Effect ◽  
Control Variate

Carbon aerogel (CA) has a rich porous structure, in which micropores and mesopores provide a huge specific surface area to form electric double layers. This property can be applied to the application of capacitive deionization (CDI). The adsorption effect of CA electrode on Cu2+ in an aqueous solution was explored for solving heavy metal water pollution. The CAs were synthesized by a sol-gel process using an atmospheric drying method. The structure of CAs was characterized by scanning in an electron microscope (SEM) and nitrogen adsorption/desorption techniques. The adsorption system was built using Cu2+ solution as the simulation of heavy metal pollution solution. The control variate method was used to investigate the effect of the anion species in copper solution, the molar ratio of resorcinol to catalyst (R/C) of CA, and the applied voltage and concentration of copper ion on the adsorption results.

Synthesis, Characterization and Photocatalytic Activity of Nb-Doped TiO2 Nanoparticles

2012 ◽  
Vol 455-456 ◽  
pp. 110-114 ◽  
Author(s):  
Xuan Dong Li ◽  
Xi Jiang Han ◽  
Wen Ying Wang ◽  
Xiao Hong Liu ◽  
Yan Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Doped Tio2 ◽  
X Ray ◽  
Vis Spectroscopy

Nb-doped TiO2 powders with different concentrations of Nb have been synthesized by a sol-gel method and characterized by a series of technologies including X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-vis spectroscopy. The photocatalytic activity of Nb-doped TiO2 is evaluated by degradation efficiency of methyl orange in aqueous solution. The results indicate that the photocatalytic activity of Nb-doped TiO2 synthesized with a Nb/Ti molar ratio of 5% is higher than that of TiO2 under the visible light.

Studies on the synthesis and properties of bischelating dioxotetraamine macrocycle, its metal complexes and thermodynamic stability in aqueous solution

2001 ◽  
Vol 79 (2) ◽  
pp. 221-225
Author(s):  
Xun-Cheng Su ◽  
Zhi-Fen Zhou ◽  
Hua-Kuan Lin ◽  
Shou-Rong Zhu ◽  
Hong-Wei Sun ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Metal Complexes ◽  
Copper Ions ◽  
Copper Ion ◽  
Uv Spectra ◽  
Titration Method ◽  
Potentiometric Titration Method ◽  
Ion Stability ◽  
The Difference ◽  
Chelating Groups

A new route to obtain C-functionalized dioxotetraamine, in which two independent chelating groups 8-quinolinol and dioxotetraamine are included, is described. In addition, two trinuclear metal complexes are synthesized and fully characterized. The thermodynamic properties of the ligand and its respective metal complex were investigated by a potentiometric titration method. Coupled with UV spectra, the difference in affinities for copper ion between dioxotetraamine and 8-quinolinol in the new ligand are investigated and the results show that 8-quinolinol is a stronger donor group than the dioxotetraamine macrocycle in an aqueous solution. Over pH 3~11, 8-quinolinol interacts 100% with the copper ions while dioxotetraamine is only partially coordinated.Key words: macrocycle, dioxotetraamine, 8-quinolinol, copper ion, stability constants.

scholarly journals The green, ultrafine cellulose-based porous nanofibrous membranes for efficient heavy metal ion removal through incorporation of chitosan by various electrospinning ways

2022 ◽  
Author(s):  
Qiushi Li ◽  
Ganmao Su ◽  
Ronggang Luo ◽  
Guanben Du ◽  
Linkun Xie ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Active Sites ◽  
Metal Removal ◽  
Copper Ions ◽  
Core Shell ◽  
Adsorption Effect ◽  
Adsorption Sites ◽  
Adsorption Performance ◽  
The Core ◽  
Nanofibrous Membranes

Abstract The rapid global industrialization worsens the contamination of heavy metals in aquatic ecosystems on the earth. In this study, the green, ultrafine cellulose-based porous nanofibrous membranes for efficient heavy metal removal through incorporation of chitosan by the conventional and core-shell electrospinning ways were firstly obtained. The relations among parameters of electrospun solution, micro-morphology and porosity for nanofibers, the variation of chemical active sites and adsorption performance of biocomposite nanofibrous membranes for conventional and core-shell electrospinning as well as the adsorption effect factors of copper ions including initial concentration, pH of solution and interaction time were comprehensively investigated. The results show that the average diameter for conventional and core-shell ultrafine nanofibers at 50% chitosan and 30% chitosan loading can achieve 56.22 nm and 37.28 nm, respectively. The core-shell cellulose acetate/chitosan (CA/CS) biocomposite nanofibrous membranes induced the surface aggregation of copper ions to impede the further adsorption. The more uniform distribution for chemical adsorption sites can be obtained by the conventional single-nozzle electrospinning than by the core-shell one, which promotes the adsorption performance of copper ions and decreases the surface shrinkage of nanofibrous membranes during adsorption. The 30% CS conventional nanofibrous membranes at the pH=5 aqueous solution showed the optimum adsorption capacity of copper ions (86.4 mg/g). The smart combination of renewable biomass with effective chemical adsorptive sites, the electrospinning technology with interwoven porous structure and the adsorption method with low cost and facile operation shows a promising prospect for water treatment.

Preparation and characterization of Ca-doped zinc oxide nanoparticles for heavy metal removal from aqueous solution

MRS Advances ◽  
2016 ◽  
Vol 1 (53) ◽  
pp. 3607-3612 ◽  
Author(s):  
Imed Ghiloufi ◽  
Jaber El Ghoul ◽  
Abueliz Modwi ◽  
Lassaad El Mir
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Heavy Metal ◽  
Zinc Oxide ◽  
Metal Removal ◽  
Sol Gel ◽  
Heavy Metal Removal ◽  
Nano Zinc Oxide ◽  
Calcium Doped ◽  
Nano Zinc

ABSTRACTNano zinc oxide (ZnO) and Calcium doped zinc oxide (CZ) nanopowders were synthesized by sol–gel method from zinc acetate di-hydrate and an adequate quantity of calcium chloride hexa-hydrate. Calcium doped zinc oxide (CZ) were prepared at different Ca concentrations from 1 wt% (CZ1) to 5 wt% (CZ5). The obtained nanopowders were characterized by transmission electron microscopy and X-ray diffraction. The objective of this work is to find a new and highly efficient nanomaterial for the adsorption of heavy metals from waste water. For this reason, the nanopowders were used to uptake heavy metals (Cr, Cd, and Ni) from aqueous solution. The obtained results show that the incorporation of Ca in nanoparticles zinc oxide (ZnO) increases the capacity adsorption of nanopowders and CZ3 is more efficient than the other Ca-doped samples. In this work we studied also the effect of pH and the pyrolysis temperature of the nanopowders on the removal of heavy metal ions from aqueous solution by CZ3.

scholarly journals Kinetic studies of adsorption of Cu (II) from aqueous solution by coriander seeds (Coriandrum Sativum)

2018 ◽  
Vol 37 ◽  
pp. 02005
Author(s):  
L. Kadiri ◽  
A. Lebkiri ◽  
E.H. Rifi ◽  
A. Ouass ◽  
Y. Essaadaoui ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Contact Time ◽  
Copper Ions ◽  
Copper Ion ◽  
Kinetic Studies ◽  
Spectroscopic Technique ◽  
Coriandrum Sativum ◽  
Ion Concentration ◽  
Potential Tool

The adsorption of copper ions Cu2+ by Coriandrum Sativum seeds (CSS) from aqueous solution was studied in order to highlight the importance of coriander seeds as a potential tool in the treatment of wastewaters containing heavy metals. The kinetic studies of adsorption of Cu (II) were discussed using the spectroscopic technique “Inducting Coupled Plasma” (ICP). The effects of initial copper ion concentration and contact time were determined. All results show that coriander seeds have, over their culinary and medicinal benefits, a significant adsorbent power of copper ions.

Sustainable Removal of Heavy Metal Using Extracted Pandanus amaryllifolius Roxb.

2014 ◽  
Vol 695 ◽  
pp. 28-31
Author(s):  
Norzita Ngadi ◽  
Noor Yahida Yahya ◽  
Roshanida Abd Rahman
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Heavy Metal ◽  
Copper Ions ◽  
Living Biomass ◽  
Solvent Extraction Method ◽  
Removal Of Heavy Metals ◽  
Atomic Adsorption Spectroscopy ◽  
Treatment Technologies ◽  
Chemical Sludge

Discharge of heavy metals from metal processing industries is known to have adverse effects to the environment. Conventional treatment technologies for removal of heavy metals from aqueous solution are not economical and generate huge quantity of toxic chemical sludge. Biosorption of heavy metals by metabolically inactive non-living biomass of microbial or plant origin is an innovative and alternative technology for removal of these pollutants from aqueous solution. Therefore, in this study, it is aimed to investigate the potential of pandan leaves as a biosorbent to remove heavy metal, copper. The pandan leaves were extracted via solvent extraction method. The effect of dosage of biosorbent, pH aqueous solution, and the biosorption contact time towards removal of copper (Cu2+) ions were studied. The concentration of copper ions was analyzed by using atomic adsorption spectroscopy (AAS). The maximum biosorption of Cu2+ ions was obtained up to 70 % for 5ppm of initial copper ions loading by 1 hour.

scholarly journals A Portable Sensor System with Ultramicro Electrode Chip for the Detection of Heavy-Metal Ions in Water

Micromachines ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1468
Author(s):  
Yuekun Wang ◽  
Yuhao Xu ◽  
Jinhua Jiang ◽  
Yang Li ◽  
Jianhua Tong ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Copper Ions ◽  
Detection System ◽  
Copper Ion ◽  
Electrode Array ◽  
Standard Addition ◽  
Detection Sensitivity ◽  
Mems Technology

In this study, an ultramicro interdigital electrode array chip (UIEA) was designed and fabricated by using Micro-Electro-Mechanical systems (MEMS) technology, and a portable detection system, using the chip for determination of heavy-metal ions in water, was developed. The working electrode of the UIEA was modified with gold nanoparticles by electrodeposition. The detection sensitivity of the UIEA chip for copper ions was 0.0138 μA·L·μg−1, with the linear range of 0–400 μg/L and the detection limit of 18.89 μg/L (3σ), which was better than that of the compared columnar glassy carbon electrode. The results of the interference experiment verified that the UIEA chip has a certain anti-interference ability against common heavy-metal ions in water, such as Pb2+, Zn2+, and Mg2+ ions. The standard addition method was used to investigate the performance of the developed s ystem for copper ion determination in real water. The recovery range from 87.5% to 94.7% was achieved.

Effect of Initial Concentration of Cu2+ on the Adsorption Performance of Hydroxyapatite

2014 ◽  
Vol 989-994 ◽  
pp. 312-315
Author(s):  
Yu Tong Guan ◽  
Shao Hong Wang ◽  
Mei Han Wang ◽  
Zhao Xia Hou ◽  
Xiao Dan Hu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Removal Efficiency ◽  
Heavy Metal Ions ◽  
Sol Gel ◽  
Initial Concentration ◽  
Adsorption Performance ◽  
Eds Analysis

Hydroxyapatite (HAP) is an effective adsorbent for removing heavy metal ions. In this study, HAP was prepared by sol-gel method and used for removing Cu2+ from aqueous solution. Initial concentration of Cu2+ in the aqueous solution was evaluated as an important parameter determining uptake. The removal efficiency and the adsorption capacity of HAP for Cu2+ were investigated. EDS analysis indicated the presence of Cu2+ on the HAP surface.

Spatial and temporal visualization of a pH-dependent complexation equilibrium by nuclear magnetic resonance imaging

1992 ◽  
Vol 70 (10) ◽  
pp. 2693-2697 ◽  
Author(s):  
B. J. Balcom ◽  
T. A. Carpenter ◽  
L. D. Hall
Keyword(s):  
Aqueous Solution ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Ethylenediaminetetraacetic Acid ◽  
Copper Ions ◽  
Copper Ion ◽  
Spin Lattice Relaxation ◽  
Complexing Agent ◽  
Complexation Equilibrium ◽  
Nuclear Magnetic

Alteration of a chemical equilibrium, ethylenediaminetetraacetic acid chelation of aqueous copper, in response to a pH gradient that protonates the complexing agent, has been observed spatially and temporally by 1H nuclear magnetic resonance. Protonation of the complexing agent shifted the complexation equilibrium towards free copper ion. Free and bound copper ions alter the spin lattice relaxation time (T1) of water in the host polyacrylamide gel to different extents. Based on this difference, a T1 weighted (fast repetition time, short echo time) two-dimensional spin-warp imaging sequence mapped out the distribution of the free and bound species. Addition of a pH 3 aqueous solution to the gel was insufficient to alter the equilibrium; a pH 1 aqueous solution liberated the complexed copper. Quantitative one-dimensional experiments gave a T1 weighted profile that showed the reaction front is displaced a distance proportional to the square root of time.

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