scholarly journals STUDY OF SORPTION OF NICKEL ION WITH FIBROUS ADSORBENTS

2020 ◽  
pp. 12-20
Author(s):  
L. Smolenskaya ◽  
S. Rybina ◽  
V. Rybin ◽  
P. Litvin
Keyword(s):  
Polyvinyl Alcohol ◽  
Cellulose Fiber ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Ph Values ◽  
Purification Efficiency ◽  
High Speeds ◽  
Optimal Value ◽  
Galvanic Production ◽  
Metal Products

Technological processes of processing of metal products and galvanic production are characterized by large volumes of wastewater containing ions of heavy metals, in particular as a result of Nickel plating products in wastewater in the predominant amount fall ions Ni2+. To assess the possibility of removing pollution from this type of wastewater, the process of adsorption purification of model Nickel-containing wastewater was investigated. As adsorbents modified nitrogen-containing polyvinyl alcohol, polycaproamide, hydrocellulose fiber were used. Modification of this type of fibers allows fixing functionally active groups on the surface of adsorbent. It is established that the fibrous adsorbents have a high adsorption capacity towards Nickel ion(II), the magnitude of adsorption is in the range of 80-100 mg/g. The predominant mechanism is monomolecular chemisorption. Adsorption proceeds at high speeds, the balance is achieved in the first 20 minutes of the process. The effect of pH on complex formation in the phase of adsorbents is revealed. It is shown that in a strongly acidic medium the purification efficiency is small, the increase in pH leads to increased adsorption properties of fibers. The optimal value of the acidity of the solution are pH values above 5. A decrease in the amount of coordinated nitrogen with an increase in pH was determined. In assessing the selectivity of fibers with respect to Ni2+ in the presence of Zn2+ and Cu2+, the influence of matrix polymer effect was revealed. Adsorption on polyvinyl alcohol and polycaproamide fibers showed that the influence of zinc ions(II) on the adsorption of Nickel (II) increases with its concentration in the solution, and hydrate cellulose fiber has a higher selectivity with respect to Zn2+ion. The presence of Cu2+ leads to a significant decrease in the efficiency of model wastewater treatment from Nickel ions (II) on all types of adsorbents studied

Determination of Tin and Nickel Content in Pyrophosphate Tin-Nickel Alloy Plating Bath

2011 ◽  
Vol 233-235 ◽  
pp. 214-218
Author(s):  
Qiu Ju Geng ◽  
Xue Wei
Keyword(s):  
Standard Deviation ◽  
Nickel Alloy ◽  
Nickel Content ◽  
Plating Bath ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Alloy Plating ◽  
Total Measurement Error ◽  
Analytical Requirements

Tin and nickel ions are in stable complexing form in Pyrophosphate tin-nickel alloy plating bath, this paper uses back-titration of Zn2+ standard solution to determine total amount of tin and nickel ions, and spectrophotometry to determine content of nickel ions in the bath to study interference and elimination methods of co-existing components. The results show that: eliminate the interference of pyrophosphate by heating the solution to hydrolyse and mask Sn4+ and Fe3+ effectively with triethanolamine, the total measurement error is about 0.91%, standard deviation is 0.0141; The recovery of determination for nickel ion content is 99.13%, and standard deviation is 0.0180; The method i-s simple, fast and is able to meet the analytical requirements for controlling the plating quality.

scholarly journals Galvanic Production Waste Water Treatment with Electro/coagulation Sludge in Terms of Nickel and Copper Ions

2013 ◽  
Author(s):  
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Copper Ions ◽  
Waste Water Treatment ◽  
Waste Waters ◽  
Chemical Cleaning ◽  
Nickel Ions ◽  
Galvanic Production ◽  
Soluble Aluminum ◽  
Electro Coagulation

A possibility of nickel ions and copper ions recovery from galvanic waste waters with electro-coagulation sludge that is formed in the process of electro/chemical cleaning of galvanic drainage pipes with the use of soluble aluminum anodes has been demonstrated. Nickel ions recovery from the galvanic waste water in case of the optimal proportion of the sludge has reached at least 55 %.

scholarly journals Nickel Sorption onto Chitosan - Silica Hybrid Aerogel from Aqueous Solution

2021 ◽  
Vol 18 (9) ◽  
Author(s):  
Kelechi EBISIKE ◽  
Afamefuna Elvis OKORONKWO ◽  
Kenneth Kanayo ALANEME
Keyword(s):  
Aqueous Solution ◽  
Hydrochloric Acid ◽  
Agricultural Waste ◽  
Sorption Process ◽  
Ion Concentration ◽  
Nickel Ion ◽  
Nickel Ions ◽  
Sorption System ◽  
Silica Hybrid ◽  
Hybrid Aerogel

The utilization and efficiency of agricultural waste-derived chitosan-silica hybrid aerogel “(CS)hA” on nickel removal from aqueous solution was examined and optimum parameters for pH, contact time, and initial ion concentration were determined during batch sorption system studies. Metal recovery was performed on the adsorbent using separately dilute concentrations of hydrochloric acid, acetic acid, ammonia, and sodium hydroxide solutions as eluents. The results generated were analyzed from kinetic and isotherm studies. The maximum Ni2+ adsorption of 99.78 % was established at 60 min and pH 3 in this study. The batch studies revealed that the percentage of nickel ion removal by the adsorbent decreased along with an increase in the initial Ni2+ ions concentration. The pseudo-second-order, the best fit of the kinetic model, has the values of its correlation coefficient “R2” ranging from 0.9 to 1, whereas the Langmuir model which had the maximum monolayer adsorption capacity of 85.84 mg g-1, was the best isotherm in interpreting the sorption process and the calculated separation factor was higher than 0 but less than 1. Dilute hydrochloric acid (0.1 M) was the best eluent in removing bound nickel ions (55.63 %) from (CS)hA.

scholarly journals Structural insights into how GTP-dependent conformational changes in a metallochaperone UreG facilitate urease maturation

2017 ◽  
Vol 114 (51) ◽  
pp. E10890-E10898 ◽  
Author(s):  
Man Hon Yuen ◽  
Yu Hang Fong ◽  
Yap Shing Nim ◽  
Pak Ho Lau ◽  
Kam-Bo Wong
Keyword(s):  
Conformational Changes ◽  
Metal Binding ◽  
Sole Source ◽  
Planar Geometry ◽  
Binding Motif ◽  
Nickel Ion ◽  
Gtp Hydrolysis ◽  
Nickel Ions ◽  
Gtp Binding

The ability of metallochaperones to allosterically regulate the binding/release of metal ions and to switch protein-binding partners along the metal delivery pathway is essential to the metallation of the metalloenzymes. Urease, catalyzing the hydrolysis of urea into ammonia and carbon dioxide, contains two nickel ions bound by a carbamylated lysine in its active site. Delivery of nickel ions for urease maturation is dependent on GTP hydrolysis and is assisted by four urease accessory proteins UreE, UreF, UreG, and UreH(UreD). Here, we determined the crystal structure of the UreG dimer from Klebsiella pneumoniae in complex with nickel and GMPPNP, a nonhydrolyzable analog of GTP. Comparison with the structure of the GDP-bound Helicobacter pylori UreG (HpUreG) in the UreG2F2H2 complex reveals large conformational changes in the G2 region and residues near the 66CPH68 metal-binding motif. Upon GTP binding, the side chains of Cys66 and His68 from each of the UreG protomers rotate toward each other to coordinate a nickel ion in a square-planar geometry. Mutagenesis studies on HpUreG support the conformational changes induced by GTP binding as essential to dimerization of UreG, GTPase activity, in vitro urease activation, and the switching of UreG from the UreG2F2H2 complex to form the UreE2G2 complex with the UreE dimer. The nickel-charged UreE dimer, providing the sole source of nickel, and the UreG2F2H2 complex could activate urease in vitro in the presence of GTP. Based on our results, we propose a mechanism of how conformational changes of UreG during the GTP hydrolysis/binding cycle facilitate urease maturation.

Continuous biosorption of nickel from aqueous solution using Chrysanthemum indicum derived biochar in a fixed-bed column

2017 ◽  
Vol 76 (7) ◽  
pp. 1895-1906 ◽  
Author(s):  
Sowmya Vilvanathan ◽  
S. Shanthakumar
Keyword(s):  
Aqueous Solution ◽  
Metal Ion ◽  
Fixed Bed ◽  
Breakthrough Curves ◽  
Ion Concentration ◽  
Column Studies ◽  
Nickel Ion ◽  
Fixed Bed Column ◽  
Nickel Ions ◽  
Chrysanthemum Indicum

The biosorption capability of Chrysanthemum indicum to remove nickel ions from aqueous solution in a fixed-bed column was examined in this study. Native C. indicum flower waste was improved for its biosorptive potential by pyrolysis to obtain its biochar form and, thereby, both raw (CIF-R) and biochar (CIF-BC) forms of the flower were used for Ni(II) removal. Fixed bed column studies were conducted to examine the influence of bed height (1.0–3.0 cm), flow rate (1.0–5.0 mL min−1) and initial metal ion concentration (25–75 mg L−1). The breakthrough curves (Cout/Cin vs time) were modelled using different dynamic adsorption models, viz. Adams-Bohart, Thomas and Yoon-Nelson model. Interpretation of the data revealed a favorable correlation with the Thomas model with higher R2 values and closer model-predicted and experimental biosorption capacity values. The equilibrium uptake capacity of CIF-R and CIF-BC for Ni(II) were found to be 14.02 and 29.44 mg g−1, respectively. Further, the column was regenerated using HCl as eluent, to desorb the adsorbed Ni(II) ions. The experimental results implied and affirmed the suitability of the biosorbents for nickel ion biosorption with its nature being favorable, efficient, and environmentally friendly.

Preparation and Characterization of Modified Cellulose Fiber-Reinforced Polyvinyl Alcohol/Polypyrrolidone Hybrid Film Composites

2012 ◽  
Vol 49 (8) ◽  
pp. 639-647 ◽  
Author(s):  
Sandeep S. Laxmeshwar ◽  
S. Viveka ◽  
D. J. Madhu Kumar ◽  
Dinesha ◽  
R. F. Bhajanthri ◽  
...  
Keyword(s):  
Polyvinyl Alcohol ◽  
Hybrid Film ◽  
Cellulose Fiber ◽  
Fiber Reinforced ◽  
Modified Cellulose ◽  
Film Composites

EFFECT OF pH ON ZnS NANOCRYSTALLINE THIN FILM EMBEDDED IN A POLYVINYL ALCOHOL MATRIX

2010 ◽  
Vol 24 (29) ◽  
pp. 5663-5673 ◽  
Author(s):  
J. P. BORAH ◽  
J. BARMAN ◽  
K. C. SARMA
Keyword(s):  
Electron Microscopy ◽  
Polyvinyl Alcohol ◽  
Ph Value ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ph Values ◽  
Nanocrystalline Thin Film ◽  
Transmission Electron ◽  
Uv Visible ◽  
Compositional Characterization

Polyvinyl alcohol (PVA) has been used as a matrix to synthesize ZnS / PVA nanocomposite film on glass substrate by chemical method. Transmission electron microscopy (TEM), X-ray diffraction (XRD), Scanning electron microscopy (SEM) has been used for structural, morphological and compositional characterization. Optical properties have been studied by UV-Visible spectrophotometry and photoluminescence (PL) spectroscopy. Changing pH value from 4.8 to 0.8 decreases the particle size and correspondingly increases the band gap. The PL emission intensity also increases by decreasing the pH values.

Separation of Nickel in Manganese Sulfate Solution Soaked out from Low-Grade Pyrolusite with Pyrite and H2SO4

2013 ◽  
Vol 779-780 ◽  
pp. 255-258
Author(s):  
Xing Zou ◽  
Xiao Dan Qiu
Keyword(s):  
Binary Systems ◽  
Sulfate Solution ◽  
Manganese Sulfate ◽  
Low Grade ◽  
Nickel Ion ◽  
Original Solution ◽  
Nickel Ions ◽  
Equilibrium Time ◽  
Ion Concentrations ◽  
Analytical Reagents

The study on separation of nickel ions with S.D.D from six kinds of solutions or systems was conducted. One of six kinds of systems was prepared with the solution (called as original solution here) leached from pyrolusite with pyrite and H2SO4, and the other five kinds of systems were prepared with analytical reagents, they are respectively: a monophyletic system of NiSO4, two binary systems of MnSO4NiSO4 and (NH4)2SO4NiSO4, a ternary system of MnSO4(NH4)2SO4NiSO4, a pentanary system of MnSO4(NH4)2SO4NiSO4CoSO4ZnSO4. The experiments about reaction time and S.D.D dosage were conducted. Results showed that the equilibrium time of reactions for the prepared five systems were equally 10min at most, while 3h was needed at least for original solution under the conditions of low temperature and low stirring speed. The residual nickel ion concentrations of the six systems were different when the same multiples of S.D.D theory dosage of each system was used for separation of nickel ions, and the S.D.D dosages for the six systems needed to meet the requirement of electrolysis were also different.

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