scholarly journals Non-Supported Nickel-Based Coral Sponge-Like Porous Magnetic Alloys for Catalytic Production of Syngas and Carbon Bio-Nanofilaments via a Biogas Decomposition Approach

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1053 ◽  
Author(s):  
Buthainah Ali ◽  
Siti Tasirin ◽  
Payam Aminayi ◽  
Zahira Yaakob ◽  
Nur Ali ◽  
...  
Keyword(s):  
Hydrogen Reduction ◽  
Process Efficiency ◽  
Low Carbon ◽  
Magnetic Alloys ◽  
Decomposition Approach ◽  
Carbon Efficiency ◽  
Industry Standards ◽  
Precipitation Procedure ◽  
Co Precipitation ◽  
Barrel Sponge

Porous Ni, Ni-Co, Ni-Fe, and Ni-Cu magnetic alloys with a morphology similar to a giant barrel sponge were synthesized via a facile co-precipitation procedure and then by hydrogen reduction treatment. For the first time, the non-supported alloys with their unique morphology were employed in catalytic biogas decomposition (CBD) at a reaction temperature of 700 °C and 100 mL min−1 to produce syngas and carbon bio-nanofilaments, and the catalysts’ behavior, CH4 and CO2 conversion, and the carbon produced during the reaction were investigated. All of the equimolar alloy catalysts showed good activity and stability for the catalytic biogas decomposition. The highest sustainability factor (0.66) and carbon yield (424%) were accomplished with the Ni-Co alloy without any significant inactivation for six hours, while the highest carbon efficiency of 36.43 was obtained with the Ni-Co catalyst, which is considered relatively low in comparison with industry standards, indicating a low carbon production process efficiency, possibly due to the relatively high biogas flow rate. The higher activity of the Ni-Co alloy catalyst was associated with the synergistic impact between nickel and cobalt, allowing the catalyst to maintain a high stability throughout the reaction period. Moreover, highly uniform, interwoven carbon bio-nanofilaments with a parallel and fishbone structure were achieved.

scholarly journals Comparative Study on the Adsorption of [AuCl4]– onto Salicylic Acid and Gallic Acid Modified Magnetite Particles

2018 ◽  
Vol 16 (3) ◽  
pp. 329 ◽  
Author(s):  
Maya Rahmayanti ◽  
Sri Juari Santosa ◽  
Sutarno Sutarno
Keyword(s):  
Salicylic Acid ◽  
Gallic Acid ◽  
Adsorption Process ◽  
Freundlich Isotherms ◽  
Precipitation Procedure ◽  
Initial Ph ◽  
Isotherm Adsorption ◽  
Pseudo Second Order ◽  
Magnetite Particles ◽  
Co Precipitation

Salicylic acid-modified magnetite (Mag-SA) and gallic acid-modified magnetite (Mag-GA) particles were prepared by co-precipitation procedure. Characterization results showed the interaction that occurs between the surface of magnetite with salicylic acid (Mag-SA) and gallic acid (Mag-GA) was through hydrogen bonding. Adsorption of [AuCl4]– onto Mag-SA and Mag-GA surfaces as a function of initial pH, contact time, and initial concentration of the [AuCl4]– solution were comparatively investigated. Result showed that the optimum adsorption of [AuCl4]– onto Mag-SA or Mag-GA was found at pH 3. The adsorption process were found to allow the pseudo-second order equation, both for Mag-SA and Mag-GA. The parameters in isotherm adsorption equations conformed to the Langmuir and Freundlich isotherms very well for Mag-GA, but for Mag-SA, only conformed to the Langmuir isotherm very well. The result of this study demonstrate that the ability Mag-GA to adsorb [AuCl4]– higher than Mag-SA.

Co-precipitation of Ni, Cr, Mn, Pb and Zn in industrial wastewater and sediment samples with copper(II) cyclo-hexylmethyldithiocarbamate for their flame atomic absorption spectrometric determination

2012 ◽  
Vol 66 (1) ◽  
pp. 105-112 ◽  
Author(s):  
Ayodele Rotimi Ipeaiyeda ◽  
Adekunle Johnson Odola
Keyword(s):  
Heavy Metals ◽  
Atomic Absorption ◽  
Industrial Wastewater ◽  
Atomic Absorption Spectrophotometry ◽  
Sample Volume ◽  
Sediment Samples ◽  
Flame Atomic Absorption ◽  
Precipitation Procedure ◽  
Co Precipitation

A co-precipitation technique for nickel(II), chromium(II), manganese(II), lead(II) and zinc(II) with the aid of copper(II) cyclo-hexylmethyldithiocarbamate was established. The influences of some analytical parameters such as pH, sample volume, amounts of cyclo-hexylmethyldithiocarbamate and copper(II) on the recovery of metal ions were investigated. The heavy metals in the precipitate were determined by flame atomic absorption spectrophotometry. The range of detection limits for the heavy metals was 0.003–0.005 mg/L. The atomic spectrometric technique with co-precipitation procedure was successfully applied for the determination of Ni, Cr, Mn, Pb and Zn in industrial wastewater and sediment samples from Ladipo stream in Lagos, Nigeria. The mean concentrations for these metals using co-precipitation procedure were not significantly different from corresponding concentrations obtained using spectrometric techniques without co-precipitation procedure.

A Study on Dynamic Change of Liaoning Agricultural Carbon Footprint

2014 ◽  
Vol 962-965 ◽  
pp. 2289-2295
Author(s):  
Fa Wang Ma ◽  
Ke Chen ◽  
Feng Li Dong ◽  
Tian Kuang ◽  
Zhi Zhang ◽  
...  
Keyword(s):  
Carbon Footprint ◽  
Dynamic Change ◽  
Diesel Oil ◽  
Total Carbon ◽  
Liaoning Province ◽  
Carbon Intensity ◽  
Small Range ◽  
Low Carbon ◽  
Low Carbon Economy ◽  
Carbon Efficiency

Agricultural producing activity is one of the emission sources of greenhouse gases, and carbon footprint is a new concept emerging in the context of developing low-carbon economy. In this paper, the agricultural carbon footprint in Liaoning Province was calculated and analyzed with carbon footprint method. According to the results, carbon cost caused by the application of chemical fertilizer and land irrigation, as well as the application of diesel oil in agricultural machinery takes up a high percentage in the input carbon footprint, and the total carbon footprint increases year by year. The carbon intensity calculated in unit output occurs in a declining trend, while the carbon intensity calculated in unit cultivated area fluctuates constantly in a small range, and the carbon efficiency occurs in evident increasing trend. Finally, deficiencies of the study and problems that should be further discussed were proposed.

Co-Precipitation Behavior of MnS and AlN in a Low-Carbon Steel

2017 ◽  
Vol 89 (3) ◽  
pp. 1700342 ◽  
Author(s):  
Martin Lückl ◽  
Tomasz Wojcik ◽  
Erwin Povoden-Karadeniz ◽  
Sabine Zamberger ◽  
Ernst Kozeschnik
Keyword(s):  
Carbon Steel ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Precipitation Behavior ◽  
Co Precipitation

Multi-Element Preconcentration/Separation of Some Metal Ions in Environmental Samples by Using Co-precipitation

2016 ◽  
Vol 99 (1) ◽  
pp. 273-278 ◽  
Author(s):  
Mustafa Soylak ◽  
Ayse Aydin ◽  
Nebiye Kizil
Keyword(s):  
Atomic Absorption ◽  
Certified Reference Materials ◽  
Environmental Water ◽  
Sample Volume ◽  
Flame Atomic Absorption ◽  
Precipitation Procedure ◽  
Flame Atomic Absorption Spectrometer ◽  
Co Precipitation ◽  
Atomic Absorption Spectrometric

Abstract A preconcentration/separation system for cadmium(II), nickel(II), copper(II), lead(II), iron(II), cobalt(II), and manganese(II) ions has been established prior to their atomic absorption spectrometric determinations. The procedure is based on the co-precipitation of these ions by the aid of a praseodymium hydroxide (Pr(OH)3) precipitate. The precipitate was dissolved in 0.5 mL of concentrated HNO3, and made up to 10.0 mL with water. The analytes were determined by a flame atomic absorption spectrometer. The effects of analytical parameters including pH, amounts of praseodymium as carrier element, sample volume, etc. on the recoveries of heavy metals were investigated. The effects of matrix ions were also examined. The limits of detection for analyte ions were found in the range between 0.7–5.2 μg/L. The validation of this present procedure was verified by the analysis of certified reference materials, TMDA-54.4 (fortified water) and NIST 1570a (spinach leaves). The proposed co-precipitation procedure was applied for the determination of cadmium(II), nickel(II), copper(II), lead(II), iron(II), cobalt(II), and manganese(II) ions in various environmental water samples.

scholarly journals A new magnetic bio-sorbent for arsenate removal from the contaminated water: Characterization, isotherms, and kinetics

2020 ◽  
Vol 7 (1) ◽  
pp. 49-58 ◽  
Author(s):  
Laleh Adlnasab ◽  
Nader Djafarzadeh ◽  
Akram Maghsodi
Keyword(s):  
Sorption Process ◽  
Polluted Water ◽  
Effective Parameters ◽  
X Ray Diffraction ◽  
Removal Time ◽  
Optimization Study ◽  
Precipitation Procedure ◽  
Calcined Layered Double Hydroxide ◽  
Co Precipitation ◽  
Double Hydroxide

Background: Arsenic (AS) is a heavy metal pollutant in water that has been known as one of the most important environmental contaminants due to its serious effects on both human health and the environment. This study was conducted to investigate the efficiency of calcined Co/Fe/Al LDH@Fe3 O4 @ PA as a new magnetic bio-sorbent for AS removal from the polluted water. Methods: At first, magnetic ternary calcined layered double hydroxide (Co/Fe/Al LDH) was synthesized through co-precipitation procedure. The synthesized CLDH was modified with phenylalanine amino acid, named CLDH@Fe3 O4 @PA. Infrared spectroscopy, X-ray diffraction, transmission, and field emission scanning electron microscopy (FESEM) were used to confirm the synthesis of the sorbent. The removal time, pH, and the sorbent dose were studied and optimized as the effective parameters on the As (V) removal. Results: The XRD, FTIR, TEM, SEM, EDS, and VSM techniques confirmed the properties of the synthesized magnetic bio-sorbent. Based on the optimization study, pH=6, the sorbent concentration of 30 mg, and the removal time of 5 minutes were considered as the optimum conditions with about 91% AS removal. The Langmuir isotherm with higher R2 value was matched well with the obtained results, and values obtained for qm and RL were 167 mg g–1 and 0.976 to 0.993, respectively. The kinetics studies were fitted well with the linear pseudo-first-order model with higher R2 at sorption process. Conclusion: The real samples results confirmed the excellent As (V) sorption capacity of the synthesized magnetic bio-sorbent in comparison with other sorbents. Therefore, CLDH@Fe3 O4 @PA sorbent is introduced as a new suitable sorbent for removal of As (V) from the polluted water.

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