Adsorption and desorption properties of arsenate onto nano-sized iron-oxide-coated quartz

2010 ◽  
Vol 62 (2) ◽  
pp. 378-386 ◽  
Author(s):  
M. G. Mostafa ◽  
Yen-Hua Chen ◽  
Jiin-Shuh Jean ◽  
Chia-Chuan Liu ◽  
Hsisheng Teng
Keyword(s):  
Iron Oxide ◽  
Treatment Process ◽  
Adsorption And Desorption ◽  
Langmuir Adsorption ◽  
Surface Areas ◽  
Adsorbent Surface ◽  
Desorption Study ◽  
Filtration Properties ◽  
Environmental Sem ◽  
Sorption Characteristics

This study was conducted to investigate the adsorption and desorption properties of arsenate [As(V)] on nano-sized iron-oxide-coated quartz (IOCQ) through batch experiments. The coating of nano-sized iron oxide on the quartz surface was performed using the heat treatment process which aimed to utilize the adsorption properties of the nano-sized iron oxide and the filtration properties of the quartz. Environmental SEM-EDAX and BET techniques were used to analyze the surface morphology, elemental composition, surface area and the porosity of the adsorbent. SEM-EDAX analyses confirmed that arsenate was adsorbed on the IOCQ surface. BET results showed that the IOCQ adsorbent had higher pore volumes and high specific surface areas compared with the pure quartz. The study revealed that the adsorption rate of As(V) ion was very rapid and reached the equilibrium within 5 min. This study also revealed that almost 100% of As(V) removal was achieved within 5 minutes of adsorption reaction from the initial solution containing 1,000 μg-As(V)/L. The Langmuir adsorption isotherm model suitably explained the sorption characteristics of As(V) onto IOCQ. This desorption study showed that the adsorbent could be reused after reacting with mild HCl solution but the concentration of acid eluant or pH has a great impact on the coated adsorbent surface. The results indicate that the nano-sized iron oxide-coated adsorbent is potentially suitable for removal of arsenate from drinking water.

scholarly journals Karekterisasi, Kinetika, dan Isoterm Adsorpsi Limbah Ampas Kelapa sebagai Adsorben Ion Cu(II)

SAINTIFIK ◽  
2020 ◽  
Vol 6 (2) ◽  
pp. 104-115
Author(s):  
Agusriyadin Agusriyadin
Keyword(s):  
Adsorption Capacity ◽  
Ph Effect ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Optimum Conditions ◽  
Langmuir Adsorption ◽  
Adsorbent Surface ◽  
Adsorption Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Penelitian ini bertujuan untuk menguji kemampuan AK dan AKPM dalam mengadsorpsi ion Cu (II), pengaruh parameter adsorpsi dan mekanisme adsorpsi. AK dan AKP Madsorben dibuat dari residu ampas kelapa. Adsorben dikarakterisasi dengan FTIR, SEM dan EDS. Pengaruh parameter adsorpsi seperti pH awal, dosis adsorben, waktu kontak dan konsentrasi ion Cu (II) awal diperiksa untuk menentukan kondisi optimum serapan tembaga (II). Ion Cu (II) yang teradsorpsi diukur berdasarkan pada konsentrasi Ion Cu (II) sebelum dan sesudah adsorpsi menggunakan metode AAS. Hasil karakterisasi menunjukkan bahwa struktur pori dan gugus fungsi tersedia pada permukaan adsorben. Menurut percobaan efek pH, kapasitas adsorpsi maksimum dicapai pada pH 7. Waktu kontak optimal dan konsentrasi tembaga awal (II) ditemukan masing-masing pada 120 menit dan 100 mg L-1. Data eksperimental sesuai dengan model kinetik orde dua orde dua, dan Langmuir isoterm adsorpsi yang diperoleh paling sesuai dengan data adsorpsi. Kapasitas adsorpsi maksimum adsorben ditemukan menjadi 4,73 dan 6,46 mg g-1 pada kondisi optimal. The results of characterization showed that the pore structure and the functional groups were available on adsorbent surface. According to the pH effect experiments, the maximum adsorption capacity was achieved at pH 7. Optimum contact time and initial copper(II) concentration were found at 120 min and 100 mg L-1, respectively. The experimental data were comply with the pseudo-second-order kinetic model, and Langmuir adsorption isotherm obtained best fitted the adsorption data. The maximum adsorption capacity of the adsorbents was found to be 4.73 and 6.46 mg g-1 at optimum conditions.

scholarly journals Synthesis and Sorption Properties towards Sr-90 of Composite Sorbents Based on Magnetite and Hematite

Materials ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1189 ◽  
Author(s):  
Andrei Egorin ◽  
Eduard Tokar ◽  
Anastasia Kalashnikova ◽  
Tatiana Sokolnitskaya ◽  
Ivan Tkachenko ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Iron Oxide ◽  
Polymer Matrix ◽  
Iron Content ◽  
Alkaline Media ◽  
Composite Sorbent ◽  
Dynamic Sorption ◽  
Composite Sorbents ◽  
Sorption Characteristics

The article describes the synthesis of composite sorbents by immobilizing iron oxide in a polymer matrix with subsequent hydrothermal treatment at a temperature of 175 °C. The sorbents based on magnetite and hematite were synthesized, their magnetic properties and phase composition were evaluated, and the iron content was determined. Sorption characteristics of the composites towards microconcentrations of Sr-90 radionuclide in solutions with different mineralization and pH were investigated. It was shown that the sorbent based on magnetite was the most efficient. In alkaline media with pH above 11, the composite sorbent based on magnetite exhibited increased selectivity towards Sr-90 and proved to be suitable for application under dynamic sorption conditions with subsequent desorption of the radionuclide with a solution of HNO3.

Fabrication of Mesoporous ZrO2 by Using Rosin-Based Quaternary Ammonium Salt

2011 ◽  
Vol 239-242 ◽  
pp. 3257-3261 ◽  
Author(s):  
Peng Wang ◽  
Zhen Dong Zhao ◽  
Li Zhi He ◽  
Liang Wu Bi ◽  
Yu Xiang Chen
Keyword(s):  
Ammonium Salt ◽  
Significant Influence ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
High Surface ◽  
Textural Properties ◽  
Precipitation Method ◽  
Adsorption And Desorption ◽  
Surface Areas ◽  
Ft Ir

Mesoporous zirconias were prepared by precipitation method using rosin-based quaternary ammonium salt as a directing agent. The samples were characterized by means of XRD, FT-IR and N2-adsorption and desorption measurements. The phase of precursors was amorphous, and well crystallized tetragonal zirconias were obtained after the calcination at 450 °C. The synthesized mesoporous zirconias possessed high surface areas ranging from 183.56 to 203.87 m2g-1and big pore diameters varying from 6.27 to 7.58 nm. The content of the rosin-based quaternary ammonium salt had significant influence on the textural properties of the mesoporous zirconias. Surface areas, pore volumes and pore diameters of the mesoporous zirconias decreased when increasing the surfactant dosage.

Kinetics, adsorption and desorption of Cd(II) and Cu(II) on natural allophane: Effect of iron oxide coating

Geoderma ◽  
2018 ◽  
Vol 319 ◽  
pp. 70-79 ◽  
Author(s):  
Jorge Silva-Yumi ◽  
Mauricio Escudey ◽  
Manuel Gacitua ◽  
Carmen Pizarro
Keyword(s):  
Iron Oxide ◽  
Oxide Coating ◽  
Adsorption And Desorption

Effects of Heat Treatment on the Mechanical and Tribological Properties of Aluminium (LM6) Reinforced with Iron Oxide (Fe2O3)

2020 ◽  
Vol 12 (3) ◽  
Author(s):  
J. Arun Prakash ◽  
P. Shanmughasundaram ◽  
M. Vemburaj ◽  
P. Gowtham
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Iron Oxide ◽  
Treatment Process ◽  
Casting Process ◽  
Stir Casting ◽  
Heat Treatment Process ◽  
Treatment Results ◽  
Mechanical And Tribological Properties

This work deals with the examination of the mechanical properties of Aluminium (LM6) reinforced with iron oxide (Fe2O3). Stir casting process is used to formulate the composite sampling by varying iron oxide in 5% and 10% by weight. Three different heat treatment process of hardening, annealing and normalizing is carried out on samples of aluminium (LM6), aluminium (LM6) + 5% Fe2O3 and aluminium (LM6) + 10% Fe2O3. Composite specimens are tested to analyze the mechanical properties such as hardness, yield stress, tensile strength and elongation. Present reinforcement specks enabled the alloy to preserve higher hardness during the heat treatment. Results have shown substantial improvements in properties of the specimens with various compositions of reinforcement.

scholarly journals Effects of reactive filters based on modified zeolite in dairy industry wastewater treatment process

2013 ◽  
Vol 19 (4) ◽  
pp. 583-592 ◽  
Author(s):  
Srdjan Kolakovic ◽  
Dragoslav Stefanovic ◽  
Dragan Milicevic ◽  
Slavisa Trajkovic ◽  
Slobodan Milenkovic ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Food Industry ◽  
Treatment Process ◽  
Dairy Industry ◽  
Technological Parameters ◽  
Wastewater Treatment Process ◽  
High Level ◽  
Filtration Properties ◽  
Industry Wastewater

Application of adsorbents based on organo-zeolites has certain advantages over conventional methods applied in food industry wastewater treatment process. The case study presented in this paper examines the possibilities and effects of treatment of dairy industry wastewater by using adsorbents based on organo-zeolites. The obtained results indicate favorable filtration properties of organo-zeolite, their high level of adsorption of organic matter and nitrate nitrogen in the analyzed wastewater. This paper concludes with recommendations of optimal technical and technological parameters for the application of these filters in practice.

Study on Adsorption and Desorption Performance of Reactive Dyes on Anionic Exchange Membrane

2011 ◽  
Vol 332-334 ◽  
pp. 168-172 ◽  
Author(s):  
Tie Ling Xing ◽  
Hu Kai ◽  
Guo Qiang Chen
Keyword(s):  
Water Solution ◽  
Adsorption Model ◽  
Dynamics Model ◽  
Adsorption And Desorption ◽  
Langmuir Adsorption ◽  
Anionic Exchange ◽  
Adsorption Processes ◽  
Adsorption And Desorption Performance ◽  
Exchange Membrane ◽  
Anionic Exchange Membrane

The adsorption and desorption performance of Reactive Brilliant Red K-2BP and Reactive Brilliant Red K-2G on anionic exchange membrane were studied. The adsorption and desorption performances of anionic exchange membrane under different conditions were compared. The results showed that the adsorption accords with the pseudo-second dynamics model. Langmuir adsorption model could well describe adsorption processes. The addition of inorganic salt Na2SO4 in the dye solution had certain influence on the adsorption. The desorption percentage could reach above 80% using the mixture of ethanol, sodium chloride and water solution as desorbent, and the anionic exchange membrane could be reused.

Adsorption and desorption of chromium with humic acid coated iron oxide nanoparticles

2019 ◽  
Vol 26 (29) ◽  
pp. 30044-30054 ◽  
Author(s):  
Shilpa Gnanamuthu Singaraj ◽  
Biswanath Mahanty ◽  
Darshan Balachandran ◽  
Anamika Padmaprabha
Keyword(s):  
Iron Oxide ◽  
Humic Acid ◽  
Iron Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Adsorption And Desorption

Effects of decalcification on the phosphate sorption characteristics of eight calcareous soils

Soil Research ◽  
1990 ◽  
Vol 28 (6) ◽  
pp. 919 ◽  
Author(s):  
ICR Holford ◽  
M Chater ◽  
GEG Mattingly
Keyword(s):  
Calcareous Soils ◽  
Sorption Isotherms ◽  
Phosphate Sorption ◽  
Surface Equation ◽  
P Sorption ◽  
Surface Areas ◽  
Freundlich Equation ◽  
Sorption Parameters ◽  
Parameter Values ◽  
Sorption Characteristics

Phosphate sorption isotherms and parameter values were determined on eight calcareous soils which were carefully decalcified using a procedure which minimized changes in cation saturation. Calcite content of the original soils varied from 0.8 to 24 2% and calcite surface areas from 4 . 0 to 8.5 m2 g-1. Sorption parameters were derived from the Langmuir 'two-surface' equation. Decalcification increased phosphate sorption at low residual P concentrations (<0.8 mg L-1) but decreased it at higher concentrations. The higher P sorption was associated with an increase in affinity because the calculated sorption capacities of high-affinity surfaces were not increased. These sorption capacities were well correlated with iron oxide contents of the soils, so the increase in phosphate affinity of these surfaces was consistent with the decrease in pH (0.5 to 1.5 units) of the decalcified soils. The lower P sorption at higher concentrations was associated with a substantial decrease in sorption capacity of the postulated low-affinity surfaces. These latter decreases were quantitatively correlated with the calcite surface areas of the original soils. These and other changes in phosphate sorption characteristics support the utility of the Langmuir 'two-surface' equation in providing information, compatible with what would be expected from more complex mechanistic models, and which exceeds what one would expect from other simpler models such as the Freundlich equation. They also support an hypothesis that an important component of low-affinity surfaces of these calcareous soils is calcite on which organic anions are co-adsorbed.

Ageing of synthetic and natural schwertmannites at pH 2—8

Clay Minerals ◽  
2008 ◽  
Vol 43 (3) ◽  
pp. 437-448 ◽  
Author(s):  
S. Kumpulainen ◽  
M.-L. Räisänen ◽  
F. Von Der Kammer ◽  
T. Hofmann
Keyword(s):  
Trace Elements ◽  
Phase Transformation ◽  
Organic Matter ◽  
Iron Oxide ◽  
Specific Surface ◽  
Room Temperature ◽  
Synthetic Sample ◽  
Surface Areas ◽  
Specific Surface Areas ◽  
One Year

AbstractThe transformation of schwertmannite to goethite was studied by ageing one synthetic and five natural schwertmannites in water at room temperature. Additionally, one synthetic and two natural schwertmannites were kept at variable pH (2, 4, 6 and 8). After one year, only the synthetic sample and one natural schwertmannite had transformed to goethite. However, the oxalate solubility of Fe and trace elements in all the samples decreased, whereas the total Fe/S ratios and specific surface areas of all samples increased. Arsenic and organic matter appeared to suppress the schwertmannite-to-goethite phase transformation. At pH 2, synthetic schwertmannite fully-transformed to goethite, but at pH 4–6 only minor transformation occurred. Depending on pH, many trace elements were released into solution during ageing of the natural schwertmannites. In general, Co, Mn, Zn and Si were released to solution, whereas As was enriched in the remaining iron oxide fraction. Al was dissolved at pH <4.

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