scholarly journals Study of Complexation Behavior of Lignite Extracted Humic Acid With Some Divalent Cations

2021 ◽  
Author(s):  
Kiran Aftab ◽  
Pervaiz Iqbal ◽  
Muzammil Hussain
Keyword(s):  
Humic Acid ◽  
Metal Complexes ◽  
Divalent Cations ◽  
Environmental Pollutants ◽  
Mineral Fertilizer ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Gravimetric Analysis ◽  
Electron Shuttles ◽  
Essential Nutrient

Abstract In biogeochemical cycles,humic substances are natural electron shuttles in transforming the nutrients and environmental pollutants. The complexes of humic acid with macro and micro nutrient metals serve as ecofriendly organo-mineral fertilizer. In this study, lignite extracted humic acid-metal (Fe, Mg, Zn) complexes were prepared and characterized. The proximate analysis exhibited the moisture, volatile matter, ash and fixed carbon contents of extracted humic acid of 02.61%, 17.31%, 57.18% and 22.90% respectively. The% metal ions in humic acid complexes ranges from 3.5-7.25%. The FTIR analysis of coal extracted humic acids-metal complexes showed Zn, Mg and Fe ions complexed in bidentate manner predominantly with carboxylic acid moiety of humic acid. Thermal gravimetric analysis indicated the higher value of humic acid decomposition as compared to their metal complexes. The thermal stability observed order is HA- Zn >HA-Fe>HA- Mg. The X-ray diffraction pattern pointed toward the non-crystalline nature of humic acid and their respective complex’s due to having few intense and some small diffuse peaks in the 2θ range from 0 to 80°.Hence the humic acid-metals complexes increase the soil humic content along the availability of essential nutrient that enhance the loam biotic action.

scholarly journals Characteristics of Woody Cutting Waste Briquette with Paper Waste Pulp as Binder

2020 ◽  
Vol 190 ◽  
pp. 00030
Author(s):  
Qurrotin Ayunina Maulida Okta Arifianti ◽  
Azmi Alvian Gabriel ◽  
Syarif Hidayatulloh ◽  
Kuntum Khoiro Ummatin
Keyword(s):  
Moisture Content ◽  
Ignition Time ◽  
Combustion Process ◽  
Calorific Value ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Hydraulic Press ◽  
Combustion Characteristic ◽  
Paper Waste ◽  
Iron Mold

The current research aimed to increase the calorific value of woody cutting waste briquette with paper waste pulp as binder. There were three different binder variation used in this study, they are 5 %, 10 %, and 15 %. To create a briquette, a cylindrical iron mold with diameter of 3.5 cm and height of 3 cm and a hydraulic press with 2 t power were applied. The physical characteristics of the combination woody waste briquette and paper waste pulp, such as moisture content, ash content, volatile matter and carbon fix were examined using proximate analysis. The calorific value of briquetted fuel was tested by bomb calorimeter. The combustion test was performed to determine the combustion characteristic of briquettes, for example initial ignition time, temperature distribution, and combustion process duration. The general result shows that the calorific value of briquette stood in the range of 4 876 kCal kg–1 to 4 993 kCal kg–1. The maximum moisture content of briquette was 5.32 %. The longest burning time was 105 min.

scholarly journals Strength of Humic Acid Aggregates: Effects of Divalent Cations and Solution pH

ACS Omega ◽  
2019 ◽  
Vol 4 (5) ◽  
pp. 8559-8567 ◽  
Author(s):  
Azizul Hakim ◽  
Tomoharu Suzuki ◽  
Motoyoshi Kobayashi
Keyword(s):  
Humic Acid ◽  
Divalent Cations ◽  
Solution Ph

Uptake of Neutral Metal Complexes by a Green Alga: Influence of pH and Humic Substances

2004 ◽  
Vol 57 (10) ◽  
pp. 931 ◽  
Author(s):  
Amiel Boullemant ◽  
Bernard Vigneault ◽  
Claude Fortin ◽  
Peter G. C. Campbell
Keyword(s):  
Humic Acid ◽  
Metal Complex ◽  
Metal Complexes ◽  
Humic Substances ◽  
Low Ph ◽  
Pseudokirchneriella Subcapitata ◽  
Short Term ◽  
Experimental Conditions ◽  
Influence Of Ph ◽  
Neutral Metal

We have examined the influence of pH and a natural humic acid on the short-term uptake (<40 min) of a neutral, lipophilic metal complex by a unicellular freshwater alga, Pseudokirchneriella subcapitata. Cadmium diethyldithiocarbamate ([Cd(DDC)2]0) was used as a model lipophilic metal complex and Suwannee River Humic Acid (SRHA) was chosen as a representative aquatic humic acid (6.5 mg C L−1). Under the experimental conditions virtually all the Cd was expected to be present as the lipophilic complex ([Cd]T = 0.38 nM; [DDC] 1 μM; [Cd2+] <10−15 M; pH 7.0, 6.0, or 5.5). Uptake of [Cd(DDC)2]0 proved to be sensitive to pH changes. It was lower at pH 6.0 and 5.5 than at pH 7.0. To our knowledge, this is the first demonstration of reduced uptake of a lipophilic metal complex at low pH. The presence of SRHA also affected uptake, either by binding the lipophilic complex in solution and reducing its bioavailability (pH 7.0) or by increasing the permeability of the algal membrane (pH 5.5).

Effects of Porous Medium Geochemical Heterogeneity and Divalent Cations on the Transport of Humic Acid

2016 ◽  
Vol 5 (2) ◽  
pp. 165-172
Author(s):  
R. Ait Akbour ◽  
J. Douch ◽  
A. Jada ◽  
H. Ouachtak ◽  
A. Ait Addi ◽  
...  
Keyword(s):  
Porous Medium ◽  
Humic Acid ◽  
Divalent Cations ◽  
Geochemical Heterogeneity

Microstructure and Basic Properties of Domestic Butyl Rubber 1751

2014 ◽  
Vol 912-914 ◽  
pp. 235-242
Author(s):  
Nai Xiu Ding ◽  
Pei Yan Zuo ◽  
Yi Jia ◽  
Li Li Wang ◽  
Hai Tao Wang
Keyword(s):  
Molecular Mass ◽  
Gel Permeation Chromatography ◽  
Mechanical Analysis ◽  
Volatile Matter ◽  
Matter Content ◽  
Butyl Rubber ◽  
Gravimetric Analysis ◽  
Average Molecular Mass ◽  
Basic Properties

The characterization of microstructure and basic properties of domestic butyl rubber 1751 ( IIR 1751) was performed with different testing , such as 1H-NMR spectrum, gel permeation chromatography, dynamic mechanical analysis, thermal gravimetric analysis and differential scanning calorimeter. And the comparison with Butyl 268 and Butyl 301 was made. The results showed that IIR1751 had a narrower molecular mass distribution, lower number-average molecular mass and lower weight-average molecular mass. The unsaturation degree of IIR1751 was close to Butyl 268 and Butyl 301. Its thermal stability was higher than the other and its ash content and volatile matter content was lower. Its glass transition temperature was same to Butyl 268’s, which was slightly higher than the Butyl 301. Dispersion of carbon black in IIR1751 vulcanizates was poor, but IIR1751 vulcanizates had good processing property, had a longer scorch safety period and fast curing rate. Its fatigue performance was good and its mechanical properties can achieve a better balance.

Characterization of Various Types Coal Using Capacitance Measurement Technique

2015 ◽  
Vol 1112 ◽  
pp. 506-509 ◽  
Author(s):  
Didied Haryono ◽  
Desiani ◽  
Mahfudz Al Huda ◽  
Warsito P. Taruno ◽  
Marlin R. Baidillah ◽  
...  
Keyword(s):  
Moisture Content ◽  
Capacitive Sensor ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Capacitance Measurement ◽  
Rank One ◽  
The Difference ◽  
Signal Characterization

Each type of coal has different composition and properties, which determine the coal rank. One of the new methods for determining the quality of coal is by measuring its capacitance. It is formerly known that the difference in the moisture content of coal can be determined from the difference in its dielectric properties. The purpose of this paper is to characterize the various types of coal based on capacitance measurement. The samples used are Lignite, Sub-bituminous, Bituminous, and Anthracite. The proximate analysis testing was done to determine the content of moisture, volatile matter, ash, and fixed carbon. Capacitance value is measured using 2-channel data acquisition system (DAS) and parallel plate capacitive sensor at frequency 2.5 MHz. The results shows that the capacitance values of each type of coal are different. The capacitance value is affected by moisture content of coal since the moisture content and capacitance value have a linear correlation. And also, the signal characterization using frequency from 1 kHz to 5 MHz was performed to verify whether the frequency used in the DAS is able to characterize coal types.

scholarly journals Energy Potential Study of Some Tropical Wood Species from Nigeria

2019 ◽  
pp. 1-10 ◽  
Author(s):  
J. O. Asibor ◽  
E. P. Akhator ◽  
A. I. Obanor
Keyword(s):  
Wood Species ◽  
Energy Content ◽  
Thermal Conversion ◽  
Volatile Matter ◽  
Proximate Analysis ◽  
Sample Collection ◽  
Energy Potential ◽  
Tropical Wood ◽  
Benin City ◽  
Afzelia Africana

Aims: To carry out experimental study of the energy potential of some tropical wood species. Study Design: It involved sample collection, experimental analysis and numerical validation of the obtained calorific values. Place and Duration of Study: National Centre for Energy Research and Development (NCERD), University of Nigeria, Nsukka, Enugu State, Nigeria between November 2016 and September 2018. Methodology: Wood waste (saw dust) from ten (10) selected tropical wood species sourced from sawmills in Benin City, Nigeria were subjected to proximate analysis, ultimate analysis as well as energy content study. Results: Thermal conversion characteristics of low ash content (0.2 – 2.76%), very high volatile matter (87.51 – 90.94%), low moisture content (8.62 – 10.53%.), relatively high carbon, hydogen and oxygen contents as well as low nitrogen and sulphur contents were observed. Obtained calorific values were validated using three already existing correlations. Conclusion: Among the 10 species studied, Afzelia africana (Apa) was found to be best suited for energy generation while Triplocyton scleroxylon (Obeche) was found to be least suited.

scholarly journals Complexes of Transition Metals with Petroleum Porphyrin Ligands: Preparation and Evaluation of Catalytic Ability

Catalysts ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1506
Author(s):  
Damir Tazeev ◽  
Lenar Musin ◽  
Nikolay Mironov ◽  
Dmitry Milordov ◽  
Elvira Tazeeva ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Metal Complexes ◽  
Divalent Cations ◽  
Component Composition ◽  
Spectral Purity ◽  
Diluted Solution ◽  
Complexes Of Transition Metals ◽  
Ft Ir ◽  
Concentrated Sulfuric Acid ◽  
Preparation And Evaluation

In the present work, the first data on the catalytic activity of d-metal complexes of petroleum porphyrins obtained via two-stage re-metallization (acid demetallization with subsequent metalation) of high-purity petroleum vanadyl porphyrins are presented. During acid demetallization of petroleum vanadyl porphyrins, the highest yield (49%) and spectral purity of free petroporphyrin bases were achieved with concentrated sulfuric acid and a diluted solution of vanadyl porphyrins in chloroform. In the series of divalent cations of Mn, Fe, Co, Ni, Cu, and Zn, only the last four metals are complexed with demetallated petroporphyrins without significant changes in their component composition, whereas the interaction with Mn and Fe cations causes an evident structural transformation or even full degradation of petroporphyrin macrocycles, respectively. The composition and spectral purity of petroleum porphyrin-containing reactants and products were analyzed by FT-IR, UV-Vis, NMR, and MALDI-TOF mass spectroscopic methods. The obtained petroporphyrin-based d-metal complexes were assayed by the reaction of 2-mercaptoethanol oxidative dimerization, in which the copper porphyrins exhibited the highest catalytic activity.

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