scholarly journals Product Characteristics of Sludge Pyrolysis and Adsorption Performance of Metals by Char

2021 ◽  
Vol 13 (21) ◽  
pp. 12125
Author(s):  
Kuo-Hsiung Lin ◽  
Jiun-Horng Tsai ◽  
Zhi-Wei Chou ◽  
Hung-Lung Chiang
Keyword(s):  
Adsorption Mechanism ◽  
Heating System ◽  
Koh Activation ◽  
Chemical Affinity ◽  
Product Characteristics ◽  
Pyrolysis Products ◽  
Gaseous Products ◽  
Adsorption Performance ◽  
Mesopore Structure ◽  
Porosity Development

The microwave heating system was used for sludge pyrolysis. The raw sludge and KOH-immersed sludge were pyrolyzed and their product characteristics were determined. The research results are advantageous to understand the influence of KOH activation on characteristics of pyrolysis products and the adsorption performance of metals in char. In the case of a high temperature and high KOH dose, most of the lost mass from sludge pyrolysis was converted into gaseous products instead of oil. The heat values of liquid oils were 40.86–41.39 MJ kg−1, which has the potential for use as fuels. The use of a higher KOH dose for sludge pyrolysis is beneficial to the porosity development and generates a mesopore structure. The results from adsorption tests indicate that precipitation could be the dominant adsorption mechanism due to the binding between alkaline anion and carbonate and metal ions with a strong chemical affinity. The high KOH dose sludge adsorbent has a remarkable adsorption performance and can be used as adsorbent for the removal of the studied metals.

Study of adsorption performance and adsorption mechanism for U(VI) ion on modified polyacrylonitrile fibers

2019 ◽  
Vol 323 (1) ◽  
pp. 365-377 ◽  
Author(s):  
Fan Wang ◽  
Xinglei Wang ◽  
Yunjie Jiang ◽  
Zhiwei Niu ◽  
Wangsuo Wu ◽  
...  
Keyword(s):  
Adsorption Mechanism ◽  
Adsorption Performance

Fabrication of three bio-adsorbents from different parts of rape straw

2021 ◽  
Author(s):  
Juan Xie ◽  
Biao Liu ◽  
Hu Wang
Keyword(s):  
Rapeseed Oil ◽  
Adsorption Mechanism ◽  
Dibutyl Phthalate ◽  
Adsorption Properties ◽  
Adsorption Volume ◽  
Rape Straw ◽  
Adsorption Performance ◽  
Effect Of Treatment ◽  
Adsorption Quantity ◽  
Different Parts

In this paper, three kinds of bio-adsorbents are fabricated from the different parts of rape straw, which are adsorbent-core, adsorbent-hull, and adsorbent-stalk, respectively. As the adsorbates, kerosene, paraffin, rapeseed oil and dibutyl phthalate are employed to evaluate the adsorption performance of the three kinds of bio-adsorbents. The results suggest that the three bio-adsorbents exhibit very different adsorption properties. The bio-adsorbent of adsorbent-core has much higher adsorption quantity to all of the four adsorbates than the other two bio-adsorbents. The adsorption mechanism of the three bio-adsorbents is investigated. The results illustrate that different bio-adsorbents own different micro-morphologies. The special micro-chamber structure is found in bio-adsorbent of adsorbent-core, which is seen as the main reason of owning excellent adsorption performance. The adsorption volume of unit mass (Va) was proposed to evaluate the intrinsic adsorption properties of the bio-adsorbents. The recovery performance of the bio-adsorbents by using of two different treatment methods is investigated. The effect of treatment on recovery rate is discussed.

scholarly journals Solid-Phase Thermal Decomposition of 2,4-Dinitroimidazole (2,4-DNI)

1995 ◽  
Vol 418 ◽  
Author(s):  
Leanna Minier ◽  
Richard Behrens ◽  
Suryanarayana Bulusu
Keyword(s):  
Thermal Decomposition ◽  
Induction Period ◽  
Solid Phase ◽  
Low Molecular Weight ◽  
Ftir Analysis ◽  
Pyrolysis Products ◽  
Gaseous Products ◽  
Elemental Formula ◽  
Gas Formation ◽  
Primary Products

AbstractThe solid-phase thermal decomposition of the insensitive energetic aromatic heterocycle 2,4- dinitroimidazole (2,4-DNI: mp 265–274°C) is studied utilizing simultaneous thermogravimetric modulated beam mass spectrometry (STMBMS) between 200° and 247°C. The pyrolysis products have been identified using perdeuterated and N-labeled isotopomers. The products consist of low molecular-weight gases and a thermally stable solid residue. The major gaseous products are NO, CO2, CO, N2, HNCO and H2O. Minor gaseous products are HCN, C2N2, NO2, C3H4N2, C3H3N3O and NH3. The elemental formula of the residue is C2HN2O and FTIR analysis suggests that it is polyurea- and polycarbamate-like in nature. The rates of formation of the gaseous products and their respective quantities have been determined for a typical isothermal decomposition experiment at 235°C. The temporal behaviors of the gas formation rates indicate that the overall decomposition is characterized by a sequence of four events; 1) an early decomposition period induced by impurities and H2O, 2) an induction period where CO2 and NO are the primary products formed at relatively constant rates, 3) an autoacceleratory period that peaks when the sample is depleted and 4) a final period in which the residue decomposes. Arrhenius parameters for the induction period are Ea = 46.9 ± 0.7 kcal/mol and Log(A) = 16.3 ± 0.3. Decomposition pathways that are consistent with the data are presented.

Facile synthesis of a polythiophene/TiO2 particle composite in aqueous medium and its adsorption performance for Pb(ii)

RSC Advances ◽  
2015 ◽  
Vol 5 (106) ◽  
pp. 86945-86953 ◽  
Author(s):  
Jie Chen ◽  
Jiangtao Feng ◽  
Wei Yan
Keyword(s):  
Aqueous Solution ◽  
Aqueous Medium ◽  
Adsorption Mechanism ◽  
Tio2 Particle ◽  
Facile Synthesis ◽  
Green Method ◽  
Particle Composite ◽  
Adsorption Performance

A polythiophene/TiO2 particle composite was synthesized by a facile and green method in aqueous medium to adsorb Pb2+ ions from aqueous solution, and both of synthesis and adsorption mechanism were proposed.

scholarly journals Gaseous Products from Scrap Tires Pyrolisis

2012 ◽  
Vol 19 (3) ◽  
pp. 451-460 ◽  
Author(s):  
Katarzyna Januszewicz ◽  
Marek Klein ◽  
Ewa Klugmann-Radziemska
Keyword(s):  
European Union ◽  
Gas Chromatography ◽  
Common Method ◽  
Pyrolysis Process ◽  
Pyrolysis Products ◽  
Scrap Tires ◽  
Gaseous Products ◽  
Oil Fractions ◽  
Light Oil ◽  
Pyrolysis Gases

Gaseous Products from Scrap Tires Pyrolisis In European Union 75% of used tires should be recycled. The most common method of used tires disposal, is burning in cement kilns, which does not solve the problem. Pyrolysis process can be an alternative way of utilization of tires. The aim of the researches was to check the influence of pyrolysis products (gas and oil fractions) on environment. Samples from pyrolysis process, like light oil fractions or pyrolysis gases were analyzed using gas chromatography. The pyrolysis installation should be hermetical, because of the PAHs which were detected in a light fraction of oil. In exhaust gases BTEX and PAHs were not detected.

scholarly journals Adsorption, viscosity and thermal behaviour of nanosized proteins with different internal stability immobilised on the surface of mesoporous activated biocarbon obtained from the horsetail herb precursor

2021 ◽  
Author(s):  
Małgorzata Wiśniewska ◽  
Dariusz Sternik ◽  
Piotr Nowicki ◽  
Stanisław Chibowski ◽  
Magdalena Medykowska ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Adsorption Mechanism ◽  
Hydrodynamic Radius ◽  
Ph Value ◽  
Carbon Surface ◽  
Internal Stability ◽  
Surface Groups ◽  
Adsorption Behaviour ◽  
Gaseous Products

AbstractThe thermal analysis methods were used for the description of the adsorption behaviour of selected proteins differing in internal stability (ovalbumin (OVA) and lysozyme (LSZ)). These proteins were immobilised on the surface of activated biocarbon obtained from the horsetail herb precursor. The values of the hydrodynamic radius of both biopolymer macromolecules in the solution were determined by the use of the viscosimetry method. This parameter is important for the specification of the possibility of proteins nano-molecules to penetrate the nano-pores of the adsorbent which leads to the increase of biopolymers adsorption. Such behaviour is observed at the pH value which is very close to the pI value of specific biopolymer (the greatest adsorption of proteins on the activated carbon surface occurs- at pH 5 for OVA being 323 mg/g, as well as at pH 11 for LSZ which is 464 mg/g). Under such conditions, the proteins macromolecules assume conformations characterized by the lowest values of hydrodynamic radius, i.e. 2.76 nm for OVA and 1.07 nm for LSZ. The data obtained from the analysis of gaseous products of thermal decomposition of the samples indicated the types of biocarbon surface groups as well as the enabled specification of the protein macromolecules adsorption mechanism.

scholarly journals Thermo-chemical analysis and modeling of combustion of waste pyrolysis gaseous products

2021 ◽  
Vol 247 ◽  
pp. 01056
Author(s):  
Alexey Demin ◽  
Grigorii Pavlov ◽  
Mansur Khasiyatullov
Keyword(s):  
Thermal Destruction ◽  
Raw Materials ◽  
Solid Carbon ◽  
Mass Ratio ◽  
Temperature Level ◽  
Pyrolysis Products ◽  
Gaseous Products ◽  
Liquid Products ◽  
Joint Pyrolysis ◽  
Pyrolysis Gases

The results of the study of joint pyrolysis of various types of waste (municipal solid waste, plastic waste, etc.) are presented. Preliminarily crushed and dried wastes were fed into the pyrolysis chamber of the model experimental setup. Thermal energy required for heating raw materials and carrying out their thermal destruction was obtained by burning a part of the pyrolysis gases. The rest of these gases were removed from the pyrolysis chamber and cooled. The temperature in the pyrolysis zone was about 650 °C. Plant productivity was up to 500 kg/h. The target product was the liquid phase, which is a mixture of hydrocarbon compounds. When organizing the processes, the yield of solid carbon residue was minimized. The obtained mass ratio of the final gas/liquid products was approximately equal to 1/6. Experimental results of the analysis of the chemical composition of the gas and liquid fractions are presented. The results of modeling the combustion of pyrolysis products at different amounts of supplied air are also shown. The operating parameters at which the optimum temperature level in the pyrolysis zone is maintained are numerically determined and recommended.

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