A Comparative Study on Co-Sorption of Zn(II) and As(V) by Mixed Fe/Al-PILCs Prepared at Different Calcination Temperatures

2011 ◽  
Vol 391-392 ◽  
pp. 783-788 ◽  
Author(s):  
Si Yuan Wu ◽  
Hong Zheng ◽  
Peter G. Weidler ◽  
Peng Cai
Keyword(s):  
Comparative Study ◽  
Calcination Temperature ◽  
Contact Time ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Synthetic Wastewater ◽  
Maximum Sorption Capacity ◽  
Calcination Temperatures ◽  
Maximum Sorption ◽  
Experiment Technique

With synthetic wastewater, a comparative study on co-sorption of Zn(II) and As(V) by Fe/Al-PILCs prepared at different calcination temperatures was investigated using a lab-scale batch experiment technique. The effects of relevant parameters, such as pH value of solution, adsorbent dosage and contact time were examined, respectively. The results show that sorption efficiencies of Zn(II) and As(V) by Fe/Al-PILC prepared at calcination temperatures of 300 °C are higher than those at 350 and 400 °C and the higher calcination temperature is, the lower sorption efficiencies of Zn(II) and As(V) are. Co-sorption isotherm data of Zn(II) and As(V) by Fe/Al-PILCs were fitted well to Langmuir isotherm and the maximum sorption capacities of Zn(II) and As(V) on Fe/Al-PILC (Q0) prepared at 300 °C are 13.95 and 15.87 mg/g, respectively, which are higher than those at calcination temperatures of 350 °C and 400 °C. The maximum sorption capacity of As(V) decreases more obviously with increasing calcination temperature than Zn(II) does. n>1 from Freundlich isotherm indicate that the sorption of Zn(II) and As(V) by Fe/Al-PILCs is favorable. E values from D-R model indicate that the type of sorption of Zn(II) and As(V) by Fe/Al-PILCs is physical. There is significant potential for Fe/Al-PILC prepared at calcination temperature of 300 °C as an adsorbent material for Zn(II) and As(V) removal from aqueous solutions.

Co-Sorption Characteristics of Zn(II) and As(V) on Mixed Fe/Al-PILCs

2013 ◽  
Vol 681 ◽  
pp. 26-30
Author(s):  
Su Yuan Wu ◽  
Hong Zheng ◽  
Peter G. Weidler ◽  
Peng Cai
Keyword(s):  
Aqueous Solutions ◽  
Langmuir Isotherm ◽  
Contact Time ◽  
Room Temperature ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Single System ◽  
Batch System ◽  
Maximum Sorption ◽  
Sorption Characteristics

Co-sorption characteristics of Zn(II) and As(V) on the mixed Fe/Al-PILCs was investigated in a batch system at room temperature. The effects of relevant parameters, such as pH value of solution, adsorbent dosage, initial Zn(II) and As(V) concentrations and contact time were examined, respectively. The results show that co-sorption capacities and co-sorption rates of Zn(II) and As(V) by Fe/Al-PILC are higher and faster than those of single Zn(II) or single As(V) by Fe/Al-PILC. Co-sorption isotherm data of Zn(II) and As(V) by Fe-Al-PILC were fitted well to Langmuir isotherm and the maximum sorption capacities of Zn(II) and As(V) on mixed Fe-Al-PILCs (Q0) are 16.98 mg/g and 16.29 mg/g, respectively, which are higher than those in single system. n>1 from Freundlich isotherm indicate that the sorption of Zn(II) and As(V) by Fe-Al-PILC is favorable. E values from D-R model indicate that the type of sorption of Zn(II) and As(V) by Fe-Al-PILC is physical. The results indicate that there is significant potential for Fe/Al-PILCs as an adsorbent material for Zn(II) and As(V) removal from aqueous solutions.

scholarly journals Use of aminated hulls of sunflower seeds for the removal of anionic dyes from aqueous solutions

2019 ◽  
Vol 17 (3) ◽  
pp. 1211-1224 ◽  
Author(s):  
T. Jóźwiak ◽  
U. Filipkowska ◽  
S. Brym ◽  
L. Kopeć
Keyword(s):  
Sorption Capacity ◽  
Textile Industry ◽  
Sunflower Seed ◽  
Freundlich Isotherm ◽  
Sorption Kinetics ◽  
Reactive Black 5 ◽  
Anionic Dyes ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption

Abstract In this study, we analyzed the effectiveness of sorption of dyes popular in the textile industry (Reactive Black 5, Reactive Yellow 84, Acid Yellow 23, and Acid Red 18) on aminated and non-aminated seed hulls of common sunflower (Helianthus annuus L.). The scope of the study included: determination of the effect of pH on dye sorption effectiveness, sorption kinetics analyses (sorption equilibrium time, pseudo-first-order/pseudo-second-order model, intramolecular diffusion model), and determination of the maximum sorption capacity against dyes (Langmuir/Freundlich isotherm). The sorbent was subjected to the FTIR analysis. The sorption capacity of the aminated sunflower seed hulls against reactive dyes RB5 and RY84 accounted for 51.02 mg/g and 63.27 mg/g, respectively, and was higher by 1665% (17.6 times higher) and 1425% (15.3 times higher) compared to that of non-modified hulls. In the case of acidic dyes, Acid Yellow 23 and Acid Red 18, the sorption capacity of the aminated sunflower seed hulls reached 44.78 mg/g and 42.19 mg/g, respectively, and was higher by 1881% (19.8 times higher) and 2284% (23.8 times higher), respectively, compared to the non-modified hulls.

Effect of Doped Iron on Fluoride Sorption by Calcined MgAlFe-CO3 Layered Double Hydroxides

2013 ◽  
Vol 681 ◽  
pp. 21-25
Author(s):  
Yu Bing Pu ◽  
Jia Rui Wang ◽  
Hong Zheng ◽  
Peng Cai ◽  
Si Yuan Wu
Keyword(s):  
Layered Double Hydroxides ◽  
Synthetic Wastewater ◽  
Precipitation Method ◽  
Molar Ratio ◽  
Fluoride Removal ◽  
Maximum Sorption Capacity ◽  
Fluoride Adsorption ◽  
Maximum Sorption ◽  
Co Precipitation ◽  
Double Hydroxides

A series of MgAlFe-CO3 layered double hydroxides (LDHs) were successfully prepared by co-precipitation method. With synthetic wastewater, the effect of doped iron on fluoride sorption by calcined MgAlFe-CO3 layered double hydroxides (CLDH) under different pH and contact time conditions was investigated. The sorption isotherm data were fitted well to Langmuir isotherm at 25 °C. The maximum sorption capacity of fluoride on CLDH increases first and then decreases with the increase of Fe/Al molar ratio and attains maximum of 71.94 mg/g when Fe/Al molar ratio is 1:2, although doped iron is unfavorable to the regeneration of original layered structure for CLDH after fluoride adsorption. No aluminium in the solution after fluoride adsorption was detected when Fe/Al molar ratio is equal to or larger than 1:2. The results indicate that CLDH with proper Fe/Al molar ratio is a promising candidate as an adsorbent material for fluoride removal from aqueous solutions.

Adsorption of CuCl2 on Mg-Al HTlc: Effect of EDTA and Addition Sequences

2012 ◽  
Vol 573-574 ◽  
pp. 150-154
Author(s):  
Yun Bo Zang ◽  
Nai Ying Wu
Keyword(s):  
Aqueous Solutions ◽  
Sorption Capacity ◽  
Contact Time ◽  
Room Temperature ◽  
Copper Ions ◽  
Sorption Process ◽  
Langmuir Model ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Pseudo Second Order

In this study, removal of copper ions from aqueous solutions by synthetic Mg-Al-HTlc was investigated as a function of contact time, EDTA and addition sequences at room temperature. It is found that HTlc could reduced copper ions concentration effectively. The kinetics closely fit pseudo-second order kinetics with necessary time 9 h to reach equilibrium. The sorption process followed langmuir model. The maximum sorption capacity calculated was found to be 39.4 mg/g. The presence of EDTA and addition sequences could affect sorption of Cu(II) onto HTlc.

scholarly journals Equilibrium and kinetics study on removal of arsenate ions from aqueous solution by CTAB/TiO2 and starch/CTAB/TiO2 nanoparticles: a comparative study

2016 ◽  
Vol 15 (1) ◽  
pp. 58-71
Author(s):  
Pankaj Gogoi ◽  
Debasish Dutta ◽  
Tarun Kr. Maji
Keyword(s):  
Comparative Study ◽  
Tio2 Nanoparticles ◽  
Removal Rate ◽  
Ammonium Bromide ◽  
X Ray ◽  
Maximum Sorption Capacity ◽  
Ion Removal ◽  
Maximum Sorption ◽  
Equilibrium And Kinetics ◽  
Sorption Mechanisms

We present a comparative study on the efficacy of TiO2 nanoparticles for arsenate ion removal after modification with CTAB (N-cetyl-N,N,N-trimethyl ammonium bromide) followed by coating with starch biopolymer. The prepared nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), thermogravimetry, scanning electron microscopy (SEM) and electron dispersive X-ray analysis (EDX). The removal efficiency was studied as a function of contact time, material dose and initial As(V) concentration. CTAB-modified TiO2 showed the highest arsenate ion removal rate (∼99% from 400 μg/L). Starch-coated CTAB-modified TiO2 was found to be best for regeneration. For a targeted solution of 400 μg/L, a material dose of 2 g/L was found to be sufficient to reduce the As(V) concentration below 10 μg/L. Equilibrium was established within 90 minutes of treatment. The sorption pattern followed a Langmuir monolayer pattern, and the maximum sorption capacity was found to be 1.024 mg/g and 1.423 mg/g after starch coating and after CTAB modification, respectively. The sorption mechanisms were governed by pseudo second order kinetics.

scholarly journals Analysis of efficiency of phosphates sorption by different granulation of selected reactive material

2018 ◽  
Vol 26 ◽  
pp. 00002 ◽  
Author(s):  
Magda Kasprzyk ◽  
Jarosław Węgler ◽  
Magdalena Gajewska
Keyword(s):  
Sorption Capacity ◽  
Model Solution ◽  
Phosphorus Compounds ◽  
Synthetic Wastewater ◽  
Reactive Material ◽  
Maximum Sorption Capacity ◽  
Fine Grained ◽  
Maximum Sorption ◽  
Potential Benefits ◽  
Fine Grained Material

In the light of the need to find an effective way to remove phosphorus from wastewater, studies on the suitability of sorption materials in this process should be conducted. The aim of the study was to examine the potential benefits of using selected adsorbents to reduce orthophosphates from the model solution under steady conditions. The study was conducted on a laboratory scale using synthetic wastewater with concentration of P-PO4 in the range of 5-100 mg/dm3. Experiment has shown that fine-grained material M1 (0-2 mm) is highly effective at removal of phosphorus compounds at the level of 97.8% at the highest concentration of P-PO4. The sorption capacity achieved during the investigation was 9.6 mg/g, while the maximum sorption capacity from the Langmuir model could reach up to 256 mg/g. Material M2 (2-8 mm) did not show satisfactory sorption capacity (maximum calculated sorption capacity: 0.36 mg/g) and the effectiveness of phosphate reduction did not exceeded 6% at the lowest concentration of P-PO4.

scholarly journals Boron Removal by Sorption on Modified Chitosan Hydrogel Beads

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5646
Author(s):  
Joanna Kluczka ◽  
Gabriela Dudek ◽  
Wojciech Pudło ◽  
Alicja Kazek-Kęsik ◽  
Roman Turczyn
Keyword(s):  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Sorption Kinetics ◽  
Isotherm Models ◽  
Isotherm Equation ◽  
Hydrogel Beads ◽  
Maximum Sorption Capacity ◽  
Modified Chitosan ◽  
Maximum Sorption ◽  
Naoh Solution

An excess concentration of boron in irrigation and drinking water can negatively affect the yield of plants and the human nervous system, respectively. To meet the recommended levels, hybrid biosorbent hydrogel beads based on chitosan and manganese (II-IV) were employed for the removal of boron from aqueous media. The results showed that the biosorbent effectively removed boric acid from the aqueous medium at neutral pH over a sorption time of 2 h and the liquid/hydrogel ratio of 20 mL/g, achieving a maximum sorption capacity near 190 mg/g. The modeling of the sorption equilibrium data indicated that the Freundlich isotherm equation gave the best fit out of the isotherm models examined. A pseudo-second-order model was found to best describe the sorption kinetics. The favorable attachment of manganese to the chitosan structure enabled the sorption of boron and was confirmed by FTIR, RS, XRD, SEM and ICP-OES methods. Boron desorption from the spent biosorbent was successfully achieved in three cycles using a NaOH solution. In general, the results of this research indicate that this method is one of the possibilities for improving water quality and may contribute to reducing pollution of the aquatic environment.

scholarly journals PARAMETER EFFECTS OF PH, DOSAGE AND CONTACT TIME ON BORON REMOVAL FROM SYNTHETIC SEA WATER USING MORINGA OLEIFERA SEEDS

2020 ◽  
Vol 21 (2) ◽  
pp. 12-24
Author(s):  
Mohammed Saedi Jami ◽  
Nur Syahirah Zakaria ◽  
Moussa Ahmed ◽  
Nik Rashida Nik Abdul Ghani ◽  
Mohammed Ngabura ◽  
...  
Keyword(s):  
Contact Time ◽  
Moringa Oleifera ◽  
Sea Water ◽  
Ph Value ◽  
Saline Water ◽  
Human Life ◽  
Freundlich Isotherm ◽  
Human Beings ◽  
Adsorption Parameters ◽  
Effects Of Ph

Boron is one of the key elements required in flora, fauna, as well as human beings. However, human life and eco-systems could be seriously affected when exposed to excessive levels of boron, especially in seawater and groundwater. In this work Moringa oleifera was selected as a precursor adsorbent owing to its eco-friendliness characteristics and favourable removal efficiency of adsorbates. Besides, M. oleifera does not significantly affect the conductivity of water and pH value after the treatment. The main aim of this work was to investigate the potentiality of M. oleifera in the treatment of boron from contaminated saline water. The effect of adsorption parameters such as pH (7 - 9), adsorbent dose of 4000 – 8000 mg/L of solution and contact time of 60 – 180 min was thoroughly investigated. Face-centred Central Composite Design (FCCCD) was applied to optimize these parameters. Consequently, the highest percentage of removal (65%) was achieved at the pH of 8, 120 min of contact time and 6000 mg/L of adsorbent dosage. The adsorption studies stated that the adsorption fitted well with the Freundlich isotherm. Therefore, the outcome of this work revealed that boron could be significantly treated using a prepared adsorbent from M. oleifera. ABSTRAK: Boron merupakan salah satu elemen yang diperlukan oleh flora, fauna, juga manusia. Walau bagaimanapun, hidup manusia dan ekosistem pasti terkesan apabila di dedahkan secara berlebihan, terutama pada air di lautan dan daratan. Kajian ini menggunakan Moringa oleifera sebagai penjerap kerana ia mempunyai ciri-ciri mesra dan berkesan membuang bahan terjerap dengan berkesan. Selain itu, M. oleifera tidak langsung memberi kesan kepada konduktiviti air dan nilai pH selepas perawatan. Tujuan utama kajian ini adalah mengkaji potensi M. oleifera dalam larutan rawatan air garam boron yang tercemar. Kesan parameter penjerapan seperti pH (7-9), dos penjerapan 4000 – 8000 mg/L larutan dan masa interaksi 60 – 180 minit di kaji dengan teliti. Kaedah Komposisi Tumpuan Tengah Muka (FCCCD) digunakan bagi mengoptimumkan parameter-parameter ini. Hasilnya, peratus tertinggi penyingkiran adalah sebanyak (65%) pada pH 8, 120 min masa interaksi dan 6000 mg/L dos penjerapan. Kesimpulannya, kajian penjerapan ini menyokong kuat teori isoterma Freundlich. Oleh itu, hasil kajian ini menunjukkan boron dapat dirawat dengan menggunakan larutan penjerapan daripada M. oleifera.

Adsorption of Ammonium Nitrogen in Water by Rice Husk Charcoal: A Simulation Study

2013 ◽  
Vol 781-784 ◽  
pp. 2063-2066 ◽  
Author(s):  
Jian Gang Han ◽  
Gang Zhao ◽  
Long Shuai Dou ◽  
Yu Jing Jing ◽  
Yong Li Zhu
Keyword(s):  
Rice Husk ◽  
Freundlich Isotherm ◽  
Ammonium Nitrogen ◽  
Ammonium Ion ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Isotherm Adsorption ◽  
Polluted Sites

Rice husk charcoal, a kind of new environmentally friendly biomass materials, which is made from rice husk under anaerobic combustion at 300°C, has been increasingly applied to remedy some polluted sites. Rice husk charcoal was employed to investigate adsorption of ammonium in simulated waste water, using once balance method. It is found that ammonium nitrogen in water can be rapidly adsorbed by rice husk charcoal in 2 min with maximum sorption capacity of 2.6 mg/g (Langmuir isotherm adsorption model). The n value of 1.2 in Freundlich isotherm model indicates that the absorbent is very suitable for rapid removal of ammonium from water. In addition, quasi-second order kinetic equation is well suited to describe ammonium absorption with time (P<0.01). The adsorption mechanism is supposed that rice husk charcoal firstly imbibes in water and much swells, and then ammonium ion diffuses into the micro pore structure and redistributes upon a steady state.

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