scholarly journals Synthesis, Characterization of Immobilized Thiosalicylic-Mercaptoethanol Bi-Ligand System and Its Application in Detoxification of Chromium III and Iron III Ions from Tannery Wastewater

2019 ◽  
Author(s):  
Bulus Habila ◽  
Pius Onyeoziri Ukoha ◽  
Stanley I.R. Okoduwa ◽  
Ahmed Salim ◽  
Muazu B. Babangida ◽  
...  
Keyword(s):  
Metal Ion ◽  
Microwave Plasma ◽  
Binding Capacity ◽  
Atomic Emission ◽  
Tannery Wastewater ◽  
Competitive Sorption ◽  
Metal Ion Binding ◽  
Ligand System ◽  
Endothermic Reactions ◽  
High Degree

<div>Background: Effective wastewater treatments are paramount to modern-day Scientists. The available methods are ineffective in detoxifying tannery wastewater. </div><div>Aim: This study synthesize and characterized polysiloxane-Immobilized thiosalicylic-mercaptoethanol ligand system (PITSMCBLS) and used in detoxification of Cr3+ and Fe3+ from tannery wastewater.</div><div>Method: Porous solid PITSMCBLS was prepared by hydrolytic polycondensation of tetraethylorthosilicate with mixture of 3-chloropropyltrimethoxysilane, methanol and sodium hydroxide as catalyst. The gelation formed (3-CPP) after 40 min, was functionalized (F-3CPP) with excess ethylchloroacetate, triethylamine and grafted with thiosalicylic-mercaptoethanol bi-ligand. The PITSMCBLS was characterized using FTIR and SEM-EDX. The competitive sorption characteristics of metal ions (Cr3+ and Fe3+) were studied using Microwave Plasma Atomic-Emission Spectrophotometer.</div><div>Result: The FTIR spectrum of PITSMCBLS showed vibrational frequencies (cm-1) at: 3339, (O-H); 2928, (C-H); 2685, (SH); 2497, (Si-H); 1587–1707, (C=O) and 1028, (Si-O). The SEM-EDX showed irregular particle sizes (4.4294 ± 1.7187 nm) and elemental composition (wt %): 3-CPP, Si (50.45); O (25.02) and Cl (24.57). The F-3CPP showed, O (58.68) and Si (41.32), while PITSMCBLS showed 11.94 of S. Gibbs free energy yielded negative range values for ΔGo (Cr3+ -14.187 to -14.832 and Fe3+ - 14.369 to -14.843 kJmol-1), positive values for: ΔHo (Cr3+ 5.345 and Fe3+ 0.000 kJmol-1) and ΔSo (Cr3+ 64.459 and Fe3+ 47.421 Jmol1K1) respectively.</div><div>Conclusion: PITSMCBLS exhibits high potential for extraction of Cr3+ and Fe3+ in tannery wastewater. The Thermodynamic values indicate spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system. This development would improve tannery wastewater treatment.</div>

scholarly journals Synthesis, Characterization of Immobilized Thiosalicylic-Mercaptoethanol Bi-Ligand System and its Application in Detoxification of Chromium III and Iron III ions from Tannery Wastewater

2019 ◽  
Author(s):  
Bulus Habila ◽  
Pius Onyeoziri Ukoha ◽  
Stanley I.R. Okoduwa ◽  
Ahmed Salim ◽  
Muazu B. Babangida ◽  
...  
Keyword(s):  
Metal Ion ◽  
Microwave Plasma ◽  
Binding Capacity ◽  
Atomic Emission ◽  
Tannery Wastewater ◽  
Competitive Sorption ◽  
Metal Ion Binding ◽  
Ligand System ◽  
Endothermic Reactions ◽  
High Degree

<div>Background: Effective wastewater treatments are paramount to modern-day Scientists. The available methods are ineffective in detoxifying tannery wastewater. </div><div>Aim: This study synthesize and characterized polysiloxane-Immobilized thiosalicylic-mercaptoethanol ligand system (PITSMCBLS) and used in detoxification of Cr3+ and Fe3+ from tannery wastewater.</div><div>Method: Porous solid PITSMCBLS was prepared by hydrolytic polycondensation of tetraethylorthosilicate with mixture of 3-chloropropyltrimethoxysilane, methanol and sodium hydroxide as catalyst. The gelation formed (3-CPP) after 40 min, was functionalized (F-3CPP) with excess ethylchloroacetate, triethylamine and grafted with thiosalicylic-mercaptoethanol bi-ligand. The PITSMCBLS was characterized using FTIR and SEM-EDX. The competitive sorption characteristics of metal ions (Cr3+ and Fe3+) were studied using Microwave Plasma Atomic-Emission Spectrophotometer.</div><div>Result: The FTIR spectrum of PITSMCBLS showed vibrational frequencies (cm-1) at: 3339, (O-H); 2928, (C-H); 2685, (SH); 2497, (Si-H); 1587–1707, (C=O) and 1028, (Si-O). The SEM-EDX showed irregular particle sizes (4.4294 ± 1.7187 nm) and elemental composition (wt %): 3-CPP, Si (50.45); O (25.02) and Cl (24.57). The F-3CPP showed, O (58.68) and Si (41.32), while PITSMCBLS showed 11.94 of S. Gibbs free energy yielded negative range values for ΔGo (Cr3+ -14.187 to -14.832 and Fe3+ - 14.369 to -14.843 kJmol-1), positive values for: ΔHo (Cr3+ 5.345 and Fe3+ 0.000 kJmol-1) and ΔSo (Cr3+ 64.459 and Fe3+ 47.421 Jmol1K1) respectively.</div><div>Conclusion: PITSMCBLS exhibits high potential for extraction of Cr3+ and Fe3+ in tannery wastewater. The Thermodynamic values indicate spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system. This development would improve tannery wastewater treatment.</div>

scholarly journals Synthesis, Characterization of Immobilized Thiosalicylic-Mercaptoethanol Bi-Ligand System and its Application in Detoxification of Chromium III and Iron III ions from Tannery Wastewater

2019 ◽  
Author(s):  
Bulus Habila ◽  
Pius Onyeoziri Ukoha ◽  
Stanley I.R. Okoduwa ◽  
Ahmed Salim ◽  
Muazu B. Babangida ◽  
...  
Keyword(s):  
Metal Ion ◽  
Microwave Plasma ◽  
Binding Capacity ◽  
Atomic Emission ◽  
Tannery Wastewater ◽  
Competitive Sorption ◽  
Metal Ion Binding ◽  
Ligand System ◽  
Endothermic Reactions ◽  
High Degree

<div>Background: Effective wastewater treatments are paramount to modern-day Scientists. The available methods are ineffective in detoxifying tannery wastewater. </div><div>Aim: This study synthesize and characterized polysiloxane-Immobilized thiosalicylic-mercaptoethanol ligand system (PITSMCBLS) and used in detoxification of Cr3+ and Fe3+ from tannery wastewater.</div><div>Method: Porous solid PITSMCBLS was prepared by hydrolytic polycondensation of tetraethylorthosilicate with mixture of 3-chloropropyltrimethoxysilane, methanol and sodium hydroxide as catalyst. The gelation formed (3-CPP) after 40 min, was functionalized (F-3CPP) with excess ethylchloroacetate, triethylamine and grafted with thiosalicylic-mercaptoethanol bi-ligand. The PITSMCBLS was characterized using FTIR and SEM-EDX. The competitive sorption characteristics of metal ions (Cr3+ and Fe3+) were studied using Microwave Plasma Atomic-Emission Spectrophotometer.</div><div>Result: The FTIR spectrum of PITSMCBLS showed vibrational frequencies (cm-1) at: 3339, (O-H); 2928, (C-H); 2685, (SH); 2497, (Si-H); 1587–1707, (C=O) and 1028, (Si-O). The SEM-EDX showed irregular particle sizes (4.4294 ± 1.7187 nm) and elemental composition (wt %): 3-CPP, Si (50.45); O (25.02) and Cl (24.57). The F-3CPP showed, O (58.68) and Si (41.32), while PITSMCBLS showed 11.94 of S. Gibbs free energy yielded negative range values for ΔGo (Cr3+ -14.187 to -14.832 and Fe3+ - 14.369 to -14.843 kJmol-1), positive values for: ΔHo (Cr3+ 5.345 and Fe3+ 0.000 kJmol-1) and ΔSo (Cr3+ 64.459 and Fe3+ 47.421 Jmol1K1) respectively.</div><div>Conclusion: PITSMCBLS exhibits high potential for extraction of Cr3+ and Fe3+ in tannery wastewater. The Thermodynamic values indicate spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system. This development would improve tannery wastewater treatment.</div>

Synthesis and Characterization of Immobilized Thiolactic Ligand System for the Detoxification of Tannery Wastewater

2020 ◽  
Vol 8 (5) ◽  
Author(s):  
Bulus Habila ◽  
Ukoha Pius O. ◽  
Ezeh Emmanuel C. ◽  
Ujam Oguejiofo ◽  
Attah John C ◽  
...  
Keyword(s):  
Metal Ion ◽  
Microwave Plasma ◽  
Binding Capacity ◽  
Low Cost ◽  
Atomic Emission ◽  
Tannery Wastewater ◽  
Competitive Sorption ◽  
Metal Ion Binding ◽  
Ligand System ◽  
Thiosalicylic Acid

A porous solid polysiloxane immobilized thiosalicylic acid ligand system has been prepared by hydrolytic polycondensation of tetraethylorthosilicate with a mixture of 3-chloropropyltrimethoxysilane, methanol and sodium hydroxide as a catalyst, gelation formed after 40 min. The product formed was functionalized with excess ethylchloroacetate, triethylamine and immobilized with thiosalicylic acid. The immobilized ligand was characterized using FTIR, the spectrum showed characteristic absorption regions (cm-1) at: 3384 (OH), 1587 to 1722 (C=C, C=O); 900 to 1038 (Si - O) respectively. SEM-EDX showed irregular particle sizes of the polysiloxane matrices with elemental composition (wt %): 3-CPPS; Si (50.45), O (25.02) and Cl (24.57). F - 3CPPS showed, O (58.68), Si (41.32); thiolactic (0.00 of S). The competitive sorption characteristic of the metal ions (Cr3+, Fe3+, Pb2+, Cu2+ and Zn2+) were studied using Microwave Plasma Atomic Emission Spectrophotometer (Agilent MPAES-4200). The immobilized thiolactic ligand exhibits high potential for the extraction of heavy metals in tannery wastewater at pH 6.0, this development would improve the treatment of tannery wastewater at a low cost; batch or column systems of extraction of metal could be employed. Thermodynamic range for the parameters with respect to Cr3+, Fe3+, Pb2+, Cu2+ and Zn2+ yielded negative values for ΔGo, (Cu2+ -(8.650 to 11.962) to Fe2+ -(14.368 to 14.842) KJmol-1; positive values for ΔHo: Zn2+ (0.000) to Cu2+ (21.047) KJmol-1 and ΔSo: Zn2+ (47.421) to Fe3+ (245.869) Jmol1K1 respectively, indicating spontaneous, endothermic reactions and high degree of disorderliness with respect to metal ion binding capacity to the ligand system.

A novel, mild and selective methylation of carboxyl groups in cellulosic pulps 10th EWLP, Stockholm, Sweden, August 25–28, 2008

Holzforschung ◽  
2009 ◽  
Vol 63 (6) ◽  
Author(s):  
Ivana Tot ◽  
Yvonne Müller ◽  
Carsten Werner ◽  
Thomas Rosenau ◽  
Antje Potthast
Keyword(s):  
Metal Ion ◽  
Binding Capacity ◽  
Heterogeneous Reactions ◽  
Fluorescence Labeling ◽  
Carboxyl Groups ◽  
Hydroxyl Groups ◽  
Metal Ion Binding ◽  
Icp Ms ◽  
Trimethylsilyl Diazomethane ◽  
Hexenuronic Acid

Abstract A method for selective, fast, and near-quantitative methylation of carboxyl groups in the presence of aliphatic hydroxyl groups of cellulose was developed. The main advantage of the method is the complete maintenance of cellulose integrity; no degradation of cellulose whatsoever during the methylation procedure was observed, making the protocol extremely useful in advanced cellulose analytics. Trimethylsilyl diazomethane (TMS-DAM) was used as the methylation agent. The methylation conditions were pre-optimized by means of carbohydrate model compounds with low-molecular weight, such as derivatives of glucuronic acid and hexenuronic acid, and then re-optimized for methylation of cellulose. The influence of reaction parameters, such as time, temperature, solvents, and concentration, was also determined. The reaction kinetics was monitored by fluorescence labeling of the remaining carboxyl groups according to the common FDAM protocol. A general protocol for the fast methylation of carboxyl groups in pulp samples is presented. The methylation with TMS-DAM is a very fast process, both in comparison to general heterogeneous reactions on cellulosic pulps, and especially in comparison to other methylation approaches. In dissolving and paper grade pulps, methylation of xylan carboxyls proceeded faster than methylation of cellulosic carboxyls. The methylation rate and kinetics are dependent on the pulp type. As application examples, electrokinetic measurements were used to demonstrate the “blocked” reactivity of carboxyl groups in spin-coated films of methylated pulp samples, and ICP-MS was used to demonstrate the drastically decreased metal ion binding capacity of pulp after such methylation.

Photophysical Characterisation, Metal Ion Binding and Enantiomeric Recognition of Chiral Ligands Containing Phenazine Fluorophore

2004 ◽  
Vol 69 (4) ◽  
pp. 885-896 ◽  
Author(s):  
Luisa Stella Dolci ◽  
Péter Huszthy ◽  
Erika Samu ◽  
Marco Montalti ◽  
Luca Prodi ◽  
...  
Keyword(s):  
Metal Ion ◽  
Photophysical Properties ◽  
Ion Binding ◽  
Metal Ion Binding ◽  
Ammonium Ions ◽  
Enantiomerically Pure ◽  
Binding Process ◽  
High Affinity ◽  
Enantiomeric Recognition ◽  
Chiral Species

Enantiomerically pure dimethyl- and diisobutyl-substituted phenazino-18-crown-6 ligands bind metal and ammonium ions and also primary aralkylammonium perchlorates in acetonitrile with high affinity, causing pronounced changes in their luminescence properties. In addition, they show enantioselectivity towards chiral primary aralkylammonium perchlorates. The possibility to monitor the binding process by photoluminescence spectroscopy can gain ground for the design of very efficient enantioselective chemosensors for chiral species. The observed changes in the photophysical properties are also an important tool for understanding the interactions present in the adduct.

scholarly journals Snapshots of a Non-Canonical RdRP in Action

Viruses ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1260
Author(s):  
Diego S. Ferrero ◽  
Michela Falqui ◽  
Nuria Verdaguer
Keyword(s):  
Metal Ion ◽  
Rna Viruses ◽  
Ion Binding ◽  
Genome Replication ◽  
Metal Ion Binding ◽  
Insect Virus ◽  
X Ray ◽  
Template Strand ◽  
Nucleotide Incorporation ◽  
Elongation Process

RNA viruses typically encode their own RNA-dependent RNA polymerase (RdRP) to ensure genome replication and transcription. The closed “right hand” architecture of RdRPs encircles seven conserved structural motifs (A to G) that regulate the polymerization activity. The four palm motifs, arranged in the sequential order A to D, are common to all known template dependent polynucleotide polymerases, with motifs A and C containing the catalytic aspartic acid residues. Exceptions to this design have been reported in members of the Permutotetraviridae and Birnaviridae families of positive single stranded (+ss) and double-stranded (ds) RNA viruses, respectively. In these enzymes, motif C is located upstream of motif A, displaying a permuted C–A–B–D connectivity. Here we study the details of the replication elongation process in the non-canonical RdRP of the Thosea asigna virus (TaV), an insect virus from the Permutatetraviridae family. We report the X-ray structures of three replicative complexes of the TaV polymerase obtained with an RNA template-primer in the absence and in the presence of incoming rNTPs. The structures captured different replication events and allowed to define the critical interactions involved in: (i) the positioning of the acceptor base of the template strand, (ii) the positioning of the 3’-OH group of the primer nucleotide during RNA replication and (iii) the recognition and positioning of the incoming nucleotide. Structural comparisons unveiled a closure of the active site on the RNA template-primer binding, before rNTP entry. This conformational rearrangement that also includes the repositioning of the motif A aspartate for the catalytic reaction to take place is maintained on rNTP and metal ion binding and after nucleotide incorporation, before translocation.

scholarly journals Chromatography-Independent Fractionation and Newly Identified Molecular Features of the Adzuki Bean (Vigna angularis Willd.) β-vignin Protein

2021 ◽  
Vol 22 (6) ◽  
pp. 3018
Author(s):  
Biane Philadelpho ◽  
Victória Souza ◽  
Fabiani Souza ◽  
Johnnie Santos ◽  
Fabiana Batista ◽  
...  
Keyword(s):  
Metal Binding ◽  
Cardiovascular Health ◽  
Binding Capacity ◽  
Biological Activities ◽  
Electrophoretic Analysis ◽  
Adzuki Bean ◽  
Molecular Features ◽  
Health Promoting ◽  
High Degree

Adzuki seed β-vignin, a vicilin-like globulin, has proven to exert various health-promoting biological activities, notably in cardiovascular health. A simple scalable enrichment procedure of this protein for further nutritional and functional studies is crucial. In this study, a simplified chromatography-independent protein fractionation procedure has been optimized and described. The electrophoretic analysis showed a high degree of homogeneity of β-vignin isolate. Furthermore, the molecular features of the purified protein were investigated. The adzuki bean β-vignin was found to have a native size of 146 kDa, and the molecular weight determined was consistent with a trimeric structure. These were identified in two main polypeptide chains (masses of 56–54 kDa) that are glycosylated polypeptides with metal binding capacity, and one minor polypeptide chain with a mass 37 kDa, wherein these features are absent. The in vitro analysis showed a high degree of digestibility of the protein (92%) and potential anti-inflammatory capacity. The results lay the basis not only for further investigation of the health-promoting properties of the adzuki bean β-vignin protein, but also for a possible application as nutraceutical molecule.

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