scholarly journals Purification of Colored Aqueous Solutions in the Adsorption Process on Magnetite Modified with Polymers

Proceedings ◽  
2019 ◽  
Vol 16 (1) ◽  
pp. 56
Author(s):  
Jędrys-Wolska ◽  
Korus
Keyword(s):  
Aqueous Solutions ◽  
Industrial Wastewater ◽  
Adsorption Process ◽  
Ph Value ◽  
Purification Process ◽  
Environmental Aspects ◽  
Chemical Structures ◽  
Different Types ◽  
The Subject ◽  
Dye Solutions

Colored industrial wastewater is a threat in many environmental aspects. As such, there is a need to find more effective methods for its purification. This article presents a brief overview of available methods for removing dyes from aqueous solutions, among them the adsorption process, which is the subject of this study. The course of preliminary tests on the process of cleaning dye solutions in the adsorption process is presented. Unmodified magnetite and magnetite modified with polymers were used as adsorbents. The synthesis of particular types of magnetite, the adsorption process, as well as the methods of further analyzes are described. As part of the work, the focus was put on a comparison of the effectiveness of the purification process for different types of adsorbents in relation to selected dyes. The varied conditions of the process were also analyzed. It has been shown that magnetite is an adsorbent that is easy to use, allowing effective separation of dyes of various chemical structures from aqueous solutions. The effectiveness of the process depends on the type of dye and on the pH value and can be increased in relation to some dyes by using magnetite modification with selected polymers.

scholarly journals A study of adsorption isotherms for the removal of herbicide Atlantis WG from aqueous solutions by using Bentonite clay

2015 ◽  
Vol 12 (1) ◽  
pp. 148-156
Author(s):  
Baghdad Science Journal
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Process ◽  
Equilibrium Concentration ◽  
Bentonite Clay ◽  
Langmuir Model ◽  
Effect Of Temperature ◽  
Isotherm Models ◽  
Sorption Data ◽  
Freundlich Model ◽  
The Subject

The subject of this research involves studying adsorption to removal herbicide Atlantis WG from aqueous solutions by bentonite clay. The equilibrium concentration have been determined spectra photometry by using UV-Vis spectrophotometer. The experimental equilibrium sorption data were analyzed by two widely, Langmuir and Freundlish isotherm models. The Langmuir model gave a better fit than Freundlich model The adsorption amount of (Atlantis WG) increased when the temperature and pH decreased. The thermodynamic parameters like ?G, ?H, and ?S have been calculated from the effect of temperature on adsorption process, is exothermic. The kinetic of adsorption process was studied depending on Lagergren ,Morris ? Weber and Rauschenberg equations.

scholarly journals Zeolites as alcohol adsorbents from aqueous solutions

2006 ◽  
pp. 83-87 ◽  
Author(s):  
Blagica Cekova ◽  
Dragi Kocev ◽  
Elena Kolcakovska ◽  
Daniela Stojanova
Keyword(s):  
Heat Treatment ◽  
Aqueous Solutions ◽  
Pore Volume ◽  
Industrial Wastewater ◽  
Organic Molecules ◽  
Adsorption Process ◽  
Aqueous Acetone ◽  
Heats Of Adsorption ◽  
Series Of Experiments ◽  
Low Costs

The potential usage of zeolites as adsorbents for the removal of organic molecules from water was investigated in a series of experiments with aqueous solutions of lower alcohols. This could represent a simple solution to the problem of cleaning up industrial wastewater as well as recovering valuable chemicals at relatively low costs. Adsorption isotherms of the Langmuir type were applied, and calculations showed that the amount of propanol adsorbed on silicalite corresponded to approximately 70% of the pore volume. The adsorption process is simple, and recovery of the more concentrated products is easily done by heat treatment and/or at lowered pressures. Adsorption experiments with aqueous acetone showed that silicalite had approximately the same adsorption capacity for acetone as for n-propanol. Heats of adsorption were determined calorimetrically.

Assessment of the adsorption kinetics, equilibrium and thermodynamic for Pb(II) removal using a hybrid adsorbent, eggshell and sericite, in aqueous solution

2019 ◽  
Vol 79 (10) ◽  
pp. 1922-1933 ◽  
Author(s):  
Hee-Jeong Choi
Keyword(s):  
Heavy Metal ◽  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Industrial Wastewater ◽  
Adsorption Process ◽  
Negative Charge ◽  
Freundlich Isotherm ◽  
Oh Groups ◽  
Strong Adsorption ◽  
Mine Wastewater

Abstract Hybrid adsorbents (ES) were prepared with mixing of eggshell and sericite as binders, and Pb(II) was removed from aqueous solutions. Sericite has the advantage of not only serving as a binder for hybrid adsorbent but also having a negative charge on the surface to improve the removal efficiency of heavy metals. Various parameters affecting the removal of Pb(II) from aqueous solutions were investigated using the optimal conditions derived. In addition, adsorption kinetics, adsorption isotherms and thermodynamic analyses were performed using the experimental results of each parameter. The ES had a more specific surface area and porosity than sericite or eggshell and contained a large number of OH groups favoring heavy metal adsorption. As a result of the adsorption of Pb(II) using the ES, the adsorption process was physical and suitable for the Freundlich isotherm. In addition, the adsorption process of Pb(II) by the ES was a spontaneous endothermic reaction. The ES can quickly reach the adsorption equilibrium and strong adsorption strength. In addition, the CaOH contained in the ES can neutralize the pH of wastewater, and it is possible to treat heavy metal ions in industrial wastewater and acid mine wastewater without controlling the pH. ES adsorbents using waste eggshells are very economic because they recycle what would otherwise be waste and have great significance in terms of resource reuse.

scholarly journals The Application of Ozone to Reduce the Coloring Intensity of Aqueous Solutions of Dyes Used in the Textile Industry

2020 ◽  
Vol 212 ◽  
pp. 01001
Author(s):  
Sergey Belov ◽  
Grigoriy Naumchik
Keyword(s):  
Aqueous Solutions ◽  
Textile Industry ◽  
Azo Dye ◽  
Organic Dyes ◽  
Experimental Studies ◽  
Color Intensity ◽  
Different Types ◽  
Standard Values ◽  
Thiazine Dye ◽  
Dye Solutions

The article discusses the mechanisms of interaction of ozone with aqueous solutions of organic dyes. Two different dyes with different types of chromophore systemwere investigated: azo dye and thiazine dye. A detailed methodology for performing experimental studies makes it possible to accurately dose ozone into the reaction mixture. The data of experimental studies are presented indicating the effectiveness of the use of ozone for the destruction of dyes in aqueous solutions. The specific doses of ozone were established to reduce the color intensity of the studied dye solutions to standard values.

scholarly journals Decolorization of Remazol Brilliant Violet 5R and Procion Red MX-5B by Trichoderma Species

2021 ◽  
Vol 1 (2) ◽  
pp. 108-117
Author(s):  
Vanessa Jane Zainip ◽  
Liyana Amalina Adnan ◽  
Mohamed Soliman Elshikh
Keyword(s):  
Ammonium Nitrate ◽  
Industrial Wastewater ◽  
Ph Value ◽  
Nitrogen Sources ◽  
Synthetic Dyes ◽  
Trichoderma Species ◽  
Carbon And Nitrogen ◽  
Different Types ◽  
Initial Ph ◽  
Remazol Brilliant Violet 5R

Industrial wastewater including dye waste disposal, has been released in a massive amount and is difficult to degrade, especially synthetic dyes. In this study, 10 different types of fungi were isolated from a decayed wood in UTM forest and were labelled as S1-S10. Two dyes were chosen for this study, which were Procion Red MX-5B (PRMX5B) and Remazol Brilliant Violet 5R (RBV5R). These fungi were screened for their ability to decolor both dyes and further tested for their ability to decolor the dyes in liquid medium under several parameters; carbon and nitrogen sources, initial pH value, temperature, and agitation. S1 decolorized PRMX5B efficiently with the addition of glucose (45%), ammonium nitrate (61%), pH 3 (69%), temperature 37°C (49%), and agitation 100 rpm (69%), whereas S2 decolorized efficiently with the addition of glucose (60%), ammonium nitrate (49%), pH 3 (70%), temperature 37°C (46%), and agitation 100 rpm (74%). S1 demonstrated efficient decolorization of RBV5R with the addition of glucose (80%), ammonium nitrate (62%), pH 3, temperature 37°C (75%), and agitation 100 rpm (90%), whereas S2 demonstrated efficient decolorization with the addition of glucose (52%), ammonium nitrate (67%), pH 3, temperature 37°C (75%), and agitation 100 rpm (71%).The percentage of decolorization of dyes was measured by using a UV-Vis spectrophotometer. These fungi were then identified using the 18sr RNA method. Based on macroscopic and microscopic characteristics and a polygenetic tree, fungi S1 belong to Trichoderma koningiopsis and fungi S2 belong to Trichoderma atroviride. 

scholarly journals PENURUNAN KONSENTRASI WARNA LIMBAH CAIR SASIRANGAN MENGGUNAKAN ADSORBENlLIMBAH PADAT. LUMPUR-AKTIF TERAKTIVASI INDUSTRI KARET

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Riza Miftahul Khair ◽  
Nopi Stiyati Prihatini ◽  
Apriani Apriani ◽  
Vita Pramaningsih
Keyword(s):  
Activated Sludge ◽  
Industrial Wastewater ◽  
Adsorption Process ◽  
Ph Value ◽  
Aquatic Organisms ◽  
Textile Wastewater ◽  
Operating Conditions ◽  
Waste Activated Sludge ◽  
High Concentration ◽  
Industrial Sludge

Limbah cair sasirangan memiliki tingkat pencemaran yangktinggi dan belummmemenuhi standar untuk dibuang ke lingkungan, sehingga harus dilakukan pengolahan terlebih dahulu. Pembuangan air limbah industri tekstilkke lingkungan tanpa adanya proses pengolahan dapat merusak ekosistem dan menjadi racun bagi organisme air, bahkan beberapa jenis pewarnaadiduga bersifat karsinogen dan membahayakankkesehatan manusia. Metode yang dapat digunakan untuk menurunkankkonsentrasi warna pada airllimbah, salah satunya adalah proses adsorpsi. Salah satu jenis adsorben yang sering digunakan dalam pengolahan air limbah serta dinilai sangattcocok untuk mengurangi zat organik dan warna yaitu karbon aktif. Pada penelitian ini dilakukan analisis penurunan konsentrasi warna limbah cair industri sasirangan menggunakan adsorben yang terbuat dari limbah padat lumpur-aktif.industri karet berbentuk bubuk (powder), denganaaktivasi adsorben menggunakan KOH. Hasil karakteristik limbah cair sasirangan Kampung Sasirangan Banjarmasin yaitu memiliki konsentrasi warna, BOD dan COD yang tinggi, memiliki nilai pH basa yaitu 11 serta konsentrasi logam Cr, Cu dan Cd yang sesuai dengan baku mutu. Sedangkan untuk kondisi operasi terbaik dalam proses adsorpsi warna menggunakan adsorben limbah lumpur–aktif karet adalah pada pH 3, dosis 9 g/L dan waktukkontak 150 menit (2,5 jam) dengannkapasitas adsorpsi 675,7 Pt.Co/g. Kata Kunci: Adsorpsi, limbah lumpur aktif, sasirangan, warna. ABSTRACT  Sasirangan textile wastewater has high pollutant power and has not met the requirements to be disposed of into the environment, so it must be treated first. The disposal of textile industrial wastewater to the environment without going through the processing process can damage the ecosystem and become toxic to aquatic organisms, even some types of dyes are thought to be carcinogens and endanger human health. One of the methods that can be used to reduce the color concentration in wastewater is the adsorption process. One type of adsorbent that is commonly used in wastewater treatment and is considered very suitable for reducing organic matter and color is activated carbon. In this study, an analysis of the decrease in the color concentration of the sasirangan industrial wastewater was carried out using an adsorbent made of powdered solid waste of activated rubber industrial sludge with adsorbent activation using KOH. The results of the characteristics of the Sasirangan wastewater in Sasirangan Village, Banjarmasin, namely having a high concentration of color, BOD and COD, having an alkaline pH value of 11 and concentrations of Cr, Cu and Cd metals in accordance with quality standards. As for the best operating conditions in the color adsorption process using waste activated sludge rubber adsorbent is at a pH of 3, a dose of 9 g / L and a contact time of 150 minutes (2.5 hours) with an adsorption capacity of 675.7 Pt.Co/g.  Keywords: Adsorption, colour, sasirangan, waste activated sludge.

Adsorption of Mn2+ Ion in Groundwater with Modified Bentonite

2012 ◽  
Vol 550-553 ◽  
pp. 2174-2177
Author(s):  
Chun Hua Liu ◽  
Chang Bin Xia
Keyword(s):  
Ion Exchange ◽  
Aqueous Solutions ◽  
Adsorption Process ◽  
Ph Value ◽  
Surface Complex ◽  
Solution Ph ◽  
Modified Bentonite ◽  
Higher Temperature ◽  
Adsorption Capability ◽  
Main Factor

The adsorption of Mn2+ion on natural bentonite heated-treated at 110 °C or 200 °C and on acid-treated with H2SO4from aqueous solutions has been investigated under different conditions,such as intial solution pH and initial Mn2+ion concentration.The results show that modified bentonite has a better adsorption capability,and the pH value is the main factor affecting adsorption;bentonite modified at higher temperature has the largest adsorption capability.The adsorption process in solution exhibits Langmuir behaviour and ion exchange and surface complex are chief adsorption form.

Point and planar defects in the iron sulfide compounds Fe1-xS

1984 ◽  
Vol 42 ◽  
pp. 434-435
Author(s):  
Thao A. Nguyen
Keyword(s):  
Low Temperatures ◽  
Direct Evidence ◽  
Iron Sulfide ◽  
Planar Defects ◽  
Selective Area ◽  
Vacancy Ordering ◽  
Different Types ◽  
Lattice Images ◽  
The Subject ◽  
Beam Lattice

It is well known that the large deviations from stoichiometry in iron sulfide compounds, Fe1-xS (0≤x≤0.125), are accommodated by iron vacancies which order and form superstructures at low temperatures. Although the ordering of the iron vacancies has been well established, the modes of vacancy ordering, hence superstructures, as a function of composition and temperature are still the subject of much controversy. This investigation gives direct evidence from many-beam lattice images of Fe1-xS that the 4C superstructure transforms into the 3C superstructure (Fig. 1) rather than the MC phase as previously suggested. Also observed are an intrinsic stacking fault in the sulfur sublattice and two different types of vacancy-ordering antiphase boundaries. Evidence from selective area optical diffractograms suggests that these planar defects complicate the diffraction pattern greatly.

Sorption of Bisphenol A in Aqueous Solutions on Irradiated and as-Grown Multiwalled Carbon Nanotubes

2018 ◽  
Vol 69 (5) ◽  
pp. 1233-1239
Author(s):  
Raluca Madalina Senin ◽  
Ion Ion ◽  
Ovidiu Oprea ◽  
Rusandica Stoica ◽  
Rodica Ganea ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Bisphenol A ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Multiwalled Carbon Nanotubes ◽  
Adsorption Process ◽  
Sorption Process ◽  
Multiwalled Carbon ◽  
Before And After ◽  
Kinetic Sorption

In this study, non-irradiated and weathered multiwalled carbon nanotubes (MWCNTs) obtained through irradiation, were studied as adsorbents for BPA, both nanomaterials being characterized before and after the adsorption process. The objectives of our investigation were to compare the characteristics of non-irradiated and irradiated MWCNTs, to evaluate the adsorption capacity of BPA by pristine and irradiated MWCNTs and to determine the variation of the kinetic, sorption and thermodynamic parameters during sorption process using both sorbents.

Geological Field Sketches and Illustrations

2019 ◽  
Author(s):  
Matthew J. Genge
Keyword(s):  
Cross Sections ◽  
Earth Science ◽  
Three Dimensional ◽  
Worked Examples ◽  
Scientific Publications ◽  
Thin Sections ◽  
Geological Features ◽  
Different Types ◽  
The Subject

Drawings, illustrations, and field sketches play an important role in Earth Science since they are used to record field observations, develop interpretations, and communicate results in reports and scientific publications. Drawing geology in the field furthermore facilitates observation and maximizes the value of fieldwork. Every geologist, whether a student, academic, professional, or amateur enthusiast, will benefit from the ability to draw geological features accurately. This book describes how and what to draw in geology. Essential drawing techniques, together with practical advice in creating high quality diagrams, are described the opening chapters. How to draw different types of geology, including faults, folds, metamorphic rocks, sedimentary rocks, igneous rocks, and fossils, are the subjects of separate chapters, and include descriptions of what are the important features to draw and describe. Different types of sketch, such as drawings of three-dimensional outcrops, landscapes, thin-sections, and hand-specimens of rocks, crystals, and minerals, are discussed. The methods used to create technical diagrams such as geological maps and cross-sections are also covered. Finally, modern techniques in the acquisition and recording of field data, including photogrammetry and aerial surveys, and digital methods of illustration, are the subject of the final chapter of the book. Throughout, worked examples of field sketches and illustrations are provided as well as descriptions of the common mistakes to be avoided.

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