Chlorate Removal by Calcined Mg/Fe/Ce Layered Double Hydroxides

2015 ◽  
Vol 737 ◽  
pp. 537-540
Author(s):  
Yan Wei Guo ◽  
Hua Zhang ◽  
Zhi Liang Zhu
Keyword(s):  
Polluted Water ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Solution Ph ◽  
Langmuir Adsorption ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Double Hydroxide ◽  
Double Hydroxides ◽  
Kinetics Of

A novel Mg/Fe/Ce layered double hydroxide (LDHs) and its calcined product (CLDH) were synthesized and CLDH was used as adsorbents for the removal of chlorate ions. Results showed that the initial solution pH was an important factor influencing the chlorate adsorption. The adsorption behavior of chlorate followed the Langmuir adsorption isotherm with a maximum adsorption capacity of 18.2 mg/g. The adsorption kinetics of chlorate on CLDH can be described by the pseudo-second-order kinetic model. It was concluded that the CLDH material is a potential adsorbent for the purification of polluted water with chlorate.

Adsorption of Phosphate on Mg/Fe Layered Double Hydroxides with Different Anions Intercalation

2015 ◽  
Vol 737 ◽  
pp. 524-527
Author(s):  
Yan Wei Guo ◽  
Hua Zhang ◽  
Zhi Liang Zhu
Keyword(s):  
Layered Double Hydroxides ◽  
Phosphate Removal ◽  
Order Kinetic ◽  
Solution Ph ◽  
Adsorption Ability ◽  
Freundlich Adsorption Isotherm ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Double Hydroxides ◽  
Kinetics Of

Three kinds of Mg/Fe layered double hydroxides (LDHs) with different intercalation anions (NO3-, Cl- and CO32-) were synthesized and used as adsorbents for the removal of phosphate in aqueous solutions. Results showed that the phosphate removal decreased with the increase of solution pH from 3.0 to 11.0. The adsorption behavior of phosphate followed the Freundlich adsorption isotherm. LDHs-NO3- had the highest adsorption ability for phosphate, the followed order was LDHs-Cl- and LDHs-CO32-. The adsorption kinetics of phosphate onto the three kinds of LDHs fit the pseudo-second-order kinetic model.

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 Removal of Pb2+ in Wastewater via Adsorption onto an Activated Carbon Produced from Winemaking Waste

Metals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 697 ◽  
Author(s):  
Francisco Alguacil ◽  
Lorena Alcaraz ◽  
Irene García-Díaz ◽  
Félix López
Keyword(s):  
Activated Carbon ◽  
Polluted Water ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Physico Chemical ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Chemical Factors ◽  
Pseudo Second Order ◽  
Kinetic And Thermodynamic Studies

This work describes the adsorption of Pb2+ in aqueous solution onto an activated carbon (AC) produced from winemaking waste (cluster stalks). After characterizing the AC using Fourier transform infrared spectroscopy (FTIR) and micro-Raman spectroscopy, the influence of different physico-chemical factors (stirring rate, temperature, pH, adsorbent concentration, etc.) on its capacity to adsorb Pb2+ was examined. Kinetic and thermodynamic studies showed that the adsorption of the Pb2+ follows a pseudo-second-order kinetic model and fits the Langmuir isotherm model, respectively. The maximum adsorption capacity of the AC was 58 mg/g at 288 K temperature and pH of 4. In conclusion, ACs made from waste cluster stalks could be successfully used to remove Pb2+ from polluted water.

scholarly journals Adsorption of Lead(II) Ions from Aqueous Solution onto Lignin

2009 ◽  
Vol 27 (4) ◽  
pp. 435-445 ◽  
Author(s):  
Laura Bulgariu ◽  
Dumitru Bulgariu ◽  
Theodor Malutan ◽  
Matei Macoveanu
Keyword(s):  
Aqueous Solution ◽  
Ion Concentration ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Solution Ph ◽  
Batch System ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

The adsorption of lead(II) ions from aqueous solution onto lignin was investigated in this study. Thus, the influence of the initial solution pH, the lignin dosage, the initial Pb(II) ion concentration and the contact time were investigated at room temperature (19 ± 0.5 °C) in a batch system. Adsorption equilibrium was approached within 30 min. The adsorption kinetic data could be well described by the pseudo-second-order kinetic model, while the equilibrium data were well fitted using the Langmuir isotherm model. A maximum adsorption capacity of 32.36 mg/g was observed. The results of this study indicate that lignin has the potential to become an effective and economical adsorbent for the removal of Pb(II) ions from industrial wastewaters.

scholarly journals Comparative study on As(III) and As(V) adsorption by CO32--intercalated Fe/Mn-LDHs from aqueous solution

2021 ◽  
Author(s):  
Yan Tian ◽  
Guifeng Liu ◽  
Yingying Gao ◽  
Yaru Wang ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Correlation Coefficients ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Metal Mining ◽  
Mining Areas ◽  
The People ◽  
Order Kinetic Model ◽  
Lead Zinc ◽  
Pseudo Second Order ◽  
Double Hydroxide

Abstract Arsenic pollution prevails in rivers and reservoirs in nonferrous metal mining areas, especially in lead–zinc mining areas, which affects the health of the people residing in such areas. Arsenic usually exists as As(III) and As(V) in water, and the adsorption of As(III) and As(V) changes with the type of adsorbent used. In this work, we report a novel adsorbent Fe/Mn–CO3-layered double hydroxide (Fe/Mn–CO3-LDH) composite that can efficiently remove both As(III) and As(V) from water. When the initial concentrations of As(III) and As(V) were 5, 10 and 50 mg/L, the adsorption capacities were 10.12–53.90 and 10.82–48.24 mg/g in the temperature range of 25–45 °C, respectively. The adsorption kinetics conformed well to the pseudo-second-order kinetic model, with all of the fitted correlation coefficients being above 0.998 for all the three initial concentrations (5, 10 and 50 mg/L) tested, suggesting a chemisorption-dominated process. The adsorption isotherms of As(III) and As(V) by Fe/Mn–CO3-LDHs conformed better to the Freundlich model than to the Langmuir one, indicating a heterogeneous reversible adsorption process. The theoretical maximum adsorption capacity increased with the increase in temperature. During adsorption, As(III) was partially converted to As(V), which was further interacted with intralayer anions. While the electrostatic attraction played an important role in the adsorption of As(V).

scholarly journals Polymer-Functionalized Magnetic Nanoparticles: Synthesis, Characterization, and Methylene Blue Adsorption

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1312 ◽  
Author(s):  
Xinyu Zheng ◽  
Huaili Zheng ◽  
Rui Zhao ◽  
Yongjun Sun ◽  
Qiang Sun ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Magnetic Nanoparticles ◽  
Adsorption Capacity ◽  
Monomer Concentration ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Solution Ph ◽  
Functionalized Magnetic Nanoparticles ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The removal of methylene blue (MB) from wastewater has attracted global concerns. In this study, polymer-functionalized magnetic nanoparticles for MB removal, Fe3O4@SiO2-MPS-g-AA-AMPS (FSMAA), were successfully synthesized by grafting acrylic acid (AA) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) on the surface of vinyl-modified Fe3O4@SiO2. With various characterization techniques, it was confirmed that the obtained FSMAA had a core–shell structure, a good magnetic property, and plenty of functional groups on its surface. MB adsorption experiments showed that the adsorption capacity of FSMAA was notably enhanced as the grafted monomer concentration and solution pH were increased. The adsorption kinetic data and isothermal data were well described by the pseudo-second-order kinetic model and the Langmuir model, respectively. The maximum adsorption capacity of FSMAA was 421.9 mg g−1 with grafted monomer concentration at 2.0 mol L−1 and solution pH at 9, much higher than those of other adsorbents stated in previous literatures. Based on XPS analysis, surface adsorption mechanism between FSMAA and MB was electrostatic interaction, hydrogen bonding, and hydrophobic interaction. Furthermore, FSMAA was effectively regenerated by acid pickling, and the remaining adsorption capacity was more than 60% after eight adsorption–regeneration cycles. All the results demonstrated the self-made FSMAA was a desirable adsorbent to remove MB from wastewater.

scholarly journals Modification of Cu/Cr Layered Double Hydroxide by Keggin Type Polyoxometalate as Adsorbent of Malachite Green from Aqueous Solution

2021 ◽  
Vol 6 (3) ◽  
pp. 209-217
Author(s):  
Neza Rahayu Palapa ◽  
Tarmizi Taher ◽  
Alfan Wijaya ◽  
Aldes Lesbani
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Adsorption Process ◽  
Order Kinetic ◽  
Keggin Type ◽  
Isotherm Adsorption ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Double Hydroxide ◽  
Double Hydroxides

Modification of Cu/Cr layered double hydroxides (LDHs) has been conducted by intercalation using Keggin type polyoxometalate [a-SiW12O40]4- to form CuCr-[a-SiW12O40]. The materials were analyzed by XRD, FTIR, and surface area analyses. Furthermore, materials were used as selectivity adsorbents of cationic dyes such as malachite green, rhodamine-B and methylene blue. The malachite green is more selective than others from an aqueous solution. The adsorption of malachite green showed that the adsorption capacity of CuCr-[a-SiW12O40] was higher than pristine LDHs. The adsorption process was followed pseudo second order kinetic model and Langmuir isotherm adsorption. The Qmax value of CuCr-[a-SiW12O40] reached 55.322 mg/g at 323 K after 100 minutes adsorption time. Thermodynamic parameters such as ΔG, ΔH and ΔS confirm that the adsorption process was endothermic, spontaneous, and more favorable at high temperatures. The intercalated material was higher structural stability toward reusability adsorbent than pristine LDHs.

Removal of hexavalent chromium from aqueous solution by calcined Zn/Al-LDHs

2016 ◽  
Vol 74 (1) ◽  
pp. 229-235 ◽  
Author(s):  
Hui-Duo Yang ◽  
Yun-Peng Zhao ◽  
Shi-Feng Li ◽  
Xing Fan ◽  
Xian-Yong Wei ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Precipitation Method ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
X Ray Diffraction ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Co Precipitation ◽  
Double Hydroxides

In this study, Zn/Al-layered double hydroxides (Zn/Al-LDHs) were synthesized by a co-precipitation method and characterized with X-ray diffraction, Fourier transform infrared spectroscopy, and scanning electron microscopy. Then the hexavalent chromium Cr(VI) adsorption experiments on calcined Zn/Al-LDHs were carried out to analyze the effects of pH, temperature, adsorption time, initial Cr(VI) concentration and adsorbent dosage on the removal of Cr(VI) from aqueous solutions. The maximum adsorption capacity for Cr(VI) on calcined Zn/Al-LDHs under optimal conditions was found to be over 120 mg/g. The kinetic and isotherm of Cr(VI) adsorption on calcined Zn/Al-LDHs can be described with the pseudo-second-order kinetic model and Langmuir isotherm, respectively.

scholarly journals Adsorption Kinetics of Pb(II), Cd(II), Zn(II) and Fe(III) onto Saponified Apple Waste

1970 ◽  
Vol 23 ◽  
pp. 102-105 ◽  
Author(s):  
Puspa Lal Homagai ◽  
Hari Paudyal
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Chemical Society ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Order Kinetic Model ◽  
Wet Condition ◽  
Pseudo Second Order ◽  
Kinetics Of ◽  
Optimal Ph

Saponified apple waste gel was prepared in wet condition with calcium hydroxide at highly alkaline medium. The effect of initial concentration, contact time and pH of the solution was investigated. The maximum adsorption capacity onto this adsorbent was investigated for Fe(III), Cd(II), Zn(II) and Pb(II) at their optimal pH of 3, 6, 4.5 and 3.5 respectively. Langmuir isotherm and pseudo second-order kinetic model gave better explanation of the adsorption process. For binary mixture of Zn(II) and Cd(II), the separation factor and effect on adsorption capacity for both the metals were investigated.Keywords: adsorption, saponified apple waste, bioadsorption.DOI: 10.3126/jncs.v23i0.2103Journal of Nepal Chemical Society, Vol. 23, 2008/2009 Page: 102-105

Isothermal, Kinetic, and Thermodynamic Studies of Graphene Oxide Adsorption on Silk

2021 ◽  
Vol 8 (5) ◽  
pp. 18-29
Author(s):  
Arobindo Chatterjee ◽  
Vinit Kumar Jain
Keyword(s):  
Graphene Oxide ◽  
Freundlich Isotherm ◽  
Sorption Process ◽  
Order Kinetic ◽  
Solution Ph ◽  
Thermodynamic Studies ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Isothermal Kinetic ◽  
Kinetics Of

The properties of graphene enriched silk depend on the amount of graphene oxide (GO) adsorption on silk. GO dipping parameters include the GO solution pH, initial GO concentration, dipping time and temperature, and the type of substrate. The effects of GO dipping parameters on the sorption process are studied to achieve the maximum GO adsorption on the silk surface for the preparation of an economical graphene/silk-based textile product. In addition, equilibrium isotherms, kinetics, and thermodynamics of GO adsorption on the silk surface in a batch sorption process are examined to understand the adsorption mechanism. The Freundlich isotherm best describes the adsorption of GO onto the silk. A pseudo-second order kinetic model best describes the kinetics of GO adsorption. Thermodynamic studies reveal that GO adsorption is spontaneous and exothermic.

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