Removal of Fluoride on Chitosan Coated Alumina (CAL) from Aqueous Solution

2012 ◽  
Vol 518-523 ◽  
pp. 797-800 ◽  
Author(s):  
Xuan Lin Tang ◽  
Huan Zhen Zhang ◽  
Shuang Zhao ◽  
Shu Fen Gong
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Adsorption Rate ◽  
Fluoride Removal ◽  
Batch Experiments ◽  
Solution Ph ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Naoh Solution

CAL beads were made by dropping wise mixture of chitosan and alumina into NaOH solution. Effects of contact time, adsorbent dosage, initial concentration and pH on fluoride removal were carried out by batch experiments. Results show that adsorption rate was relatively rapid in the first 6 h, thereafter distinctly decreased until adsorption reached the equilibrium within 48 h, at this time, adsorption capacity was up to 0.67 mg/g, which was much higher than raw chitosan (0.052 mg/g). Fluoride removal increased significantly with an increase of adsorbent dosage, however, it rose slowly when the adsorbent dosage was above 16 g/L. Adsorption capacity reduced from 0.75 mg/g to 0.64mg/g when solution pH rose from 4 to 7, nevertheless, adsorption was relatively independent on solution pH between 7 and 10.

Study of the Sorption of Cu(II) from Aqueous Solution Using Amusium pleuronectes Shell

2016 ◽  
Vol 675-676 ◽  
pp. 631-634
Author(s):  
Preeyawal Kuha ◽  
Kanyakorn Teanchai ◽  
Wichian Siriprom
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Physical Adsorption ◽  
Batch Experiments ◽  
Optimum Conditions ◽  
Solution Ph ◽  
Xrd Pattern ◽  
Initial Concentration ◽  
X Ray ◽  
Batch Biosorption

In the present study batch biosorption studies were carried out for the adsorption of Cu (II) from aqueous solution with Amusium Pleuronectes shell. Variables of the batch experiments include initial concentration of Cu (II), solution pH, contact time, were investigated. The experimental results explored that the maximum pH for efficient sorption of Cu (II) was 9. The optimum conditions of sorption were found to be contact time of 200 min, initial Cu concentration 250 mg/L. Another that, the X-Ray Driffraction (XRD) was used to confirmed the binding site between the bio sorbent and the Cu (II) ions. From XRD pattern the result suggests that the mechanism of bio sorption is rather chemisorption than physical adsorption.

scholarly journals Paraquat dichloride adsorption from aqueous solution using Carbonized Bambara Groundnut (Vigna subterranean) Shells

2020 ◽  
Vol 12 (1) ◽  
pp. 167-177
Author(s):  
Ayuba Abdullahi Muhammad ◽  
Nyijime Thomas Aondofa
Keyword(s):  
Aqueous Solution ◽  
Water Treatment ◽  
Contact Time ◽  
Adsorption Process ◽  
Bambara Groundnut ◽  
Experimental Result ◽  
Isotherm Model ◽  
Batch Adsorption ◽  
Solution Ph ◽  
Adsorbent Dosage

Carbonized Bambara GroundNut Shell (CBGNS) was used as adsorbent for the adsorption of paraquat dichloride (PQ) from aqueous solution. The prepared adsorbent was characterized using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy methods. Several parameters that might affect the adsorption process including pH, contact time, adsorbent dosage, temperature and initial concentration were investigated and optimized using batch adsorption technique. Results of the study revealed that maximum removal efficiency (98%) was achieved using 0.05g adsorbent dosage, solution pH of 5 and 60 min of contact time. The equilibrium experimental result revealed that Langmuir model best described the adsorption process with R2 value of 0.956.The heat of adsorption process was estimated from Temkin Isotherm model to be 19.99J/mol and the mean free energy was estimated from Duninin-Radushkevich (DRK) isotherm model to be 0.289KJ/mol indicating chemisorptions process. The kinetic and thermodynamic studies revealed that the adsorption processes followed pseudo-second-order kinetics with R2 value of 0.999 and the value of ∆G (- 27.74 kJ mol-1), ∆H (13.145 kJ mol-1) indicate the spontaneous and endothermic nature of PQ adsorption on CBGNS. The results suggested that CBGNS had the potential to become a promising material for PQ contaminated water treatment. Keywords: Adsorption, Paraquat dichloride, Carbonized Bambara Ground nut shell, Water treatment.

Removal of β-Naphthalenesulfonic Acid from Aqueous Solution Using Modified Resin

2012 ◽  
Vol 518-523 ◽  
pp. 2740-2744
Author(s):  
Ying Li ◽  
Chang Hai Li ◽  
Dong Mei Jia ◽  
Yue Jin Li
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Acid Concentration ◽  
Ferric Oxide ◽  
Contact Time ◽  
Equilibrium Adsorption ◽  
Maximum Adsorption Capacity ◽  
Batch Experiments ◽  
Hydrated Ferric Oxide ◽  
Modified Resin

A newly modified resin can be impregnated with hydrated ferric oxide on the base of D301 resin. The article involved batch experiments to investigate the effect of concentration, contact time, pH and temperature. The results showed that the maximum adsorption was found at 6 h,3.0 pH and 298 K temperature. The maximum adsorption capacity was 961.95 mg/g at 1200 mg/L initial β-naphthalenesulfonic acid concentration. The equilibrium adsorption was fitted by Temkin isotherm.

Response Surface Methodology Approach for Optimization of Biosorption Process for Removal of Binary Metals by Immobilized Saccharomyces cerevisiae

2014 ◽  
Vol 661 ◽  
pp. 51-57
Author(s):  
Mohd Zawawi Mohamad Zulhelmi ◽  
Alrozi Rasyidah ◽  
Senusi Faraziehan ◽  
Mohamad Anuar Kamaruddin
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Aqueous Solution ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Contact Time ◽  
Optimization Procedure ◽  
Effective Parameters ◽  
Solution Ph ◽  
Initial Concentration ◽  
Biosorption Process

Biosorption process is considered as economical treatment to remove metal from the aqueous solution compared to other established methods. In this study, Saccharomyces cerevisiae was used as biosorbent and subject to immobilization process which consists of ethanol treatment for the removal of binary metals, lead (II) and nickel (II) from aqueous solution. Response surface methodology (RSM) was used to optimize effective parameters condition and the interaction of two or more parameters in order to obtain high removal of the binary metals. The parameters that have been studied were initial concentration of binary metals solution (10 - 60 mg/L), biosorbent dosage (0.2 - 1.0 g), pH (pH 2 - pH 6) and contact time (30 - 360 minutes) towards lead (II) and nickel (II) ions removal. Based on analysis of variance (ANOVA), biosorbent dosage, solution pH and contact time factor were found significant for both responses. Through optimization procedure, the optimum condition for lead (II) and nickel (II) ions removal were obtained at initial concentration of 10.0 mg/L, biosorbent dosage of 1.0 g, solution pH of pH 6, and contact time of 360.00 minutes, which resulted in 95.08 % and 21.09 % removal of lead (II) and nickel (II) ions respectively.

Determination of Adsorption Capacity of Agricultural-Based Carbon for Ni (II) Adsorption from Aqueous Solution

2014 ◽  
Vol 567 ◽  
pp. 20-25 ◽  
Author(s):  
Taimur Khan ◽  
Mohamed Hasnain Isa ◽  
Malay Chaudhuri ◽  
Raza Ul Mustafa Muhammad ◽  
Mohamed Osman Saeed
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Contact Time ◽  
Low Cost ◽  
Equilibrium Adsorption ◽  
Batch Adsorption ◽  
Average Pore ◽  
Initial Concentration ◽  
Rice Husk Carbon

The aim of the study was to prepare potentially cheaper carbon for the adsorptive removal of Nickle [Ni (II)] from aqueous solution. The adsorption capacity of the prepared carbon to remove Ni (II) from aqueous solution was determined and adsorption mechanism was investigated. Rice husk carbon was prepared by incineration in a muffle furnace. The incinerated rice husk carbon (IRHC) was characterised in terms of surface area, micropore area, micropore volume, average pore diameter and surface morphology. Adsorption of Ni (II) by IRHC was examined. The influence of operating parameters, namely, pH, initial concentration and contact time on adsorption of Ni (II) by IRHC was evaluated. Batch adsorption tests showed that extent of Ni (II) adsorption depended on initial concentration, contact time and pH. Equilibrium adsorption was achieved in 120 min, while maximum Ni (II) adsorption occurred at pH 4. Langmuir and Freundlich isotherms were studied and the equilibrium adsorption data was found to fit well with the Langmuir isotherm model. Langmuir constants Q° and b were 14.45 and 0.10, and Freundlich constants Kf and 1/n were 4.0 and 0.26, respectively. Adsorption of Ni (II) by IRHC followed pseudo-second-order kinetics. Being a low-cost carbon, IRHC has potential to be used for the adsorption of Ni (II) from aqueous solution and wastewater in developing countries.

Adsorption of Two Heavy Metal Ions on Dry Garlic Stem

2011 ◽  
Vol 396-398 ◽  
pp. 2443-2446
Author(s):  
Neng Zhou ◽  
Zhen Zhou ◽  
Yuan Qin ◽  
Chu Jie Zeng ◽  
Zu Qiang Huang
Keyword(s):  
Adsorption Capacity ◽  
Contact Time ◽  
Heavy Metal Ions ◽  
Adsorption Rate ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Experimental Conditions ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Temperature

This study reported the feasibility of adsorption of heavy metals using dry garlic stem, an environmentally-friendly and natural adsorbent．Using batch adsorption technique, the efficiency of the adsorbent was studied under different experimental conditions by varying parameters such as pH, initial concentration and contact time. The results show that at pH 2.03, adsorption temperature 35°C, the adsorption time 90 min and the amount of garlic stem 1.0 g, Pb2+ have the maximum adsorption capacity. The maximum adsorption capacity of the Pb2+ on garlic stem is 28.42 mg/g and the adsorption rate is 94.74%. At pH 4.05, the adsorption time 120 min and the amount of garlic stem 1.0, Cu2+ have the maximum adsorption at the same temperature. The maximum adsorption of the Cu2+ is 20.90 mg/g and the adsorption rate is 69.75%. The dry garlic stem was found to be efficient in removing lead and copper from aqueous solution as compared to other adsorbents already used for the removal of these ions.

scholarly journals Study on cyclic crosslinked polyphosphazene microspheres and its adsorption behavior for uranium (VI)

2021 ◽  
Vol 290 ◽  
pp. 03021
Author(s):  
Meixue Xu ◽  
Kaifa Liao ◽  
Mouwu Liu ◽  
Yi Tan ◽  
Yanfei Wang
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Precipitation Polymerization ◽  
Adsorption Rate ◽  
Adsorption Behavior ◽  
Liquid Ratio ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Solid Liquid

Poly (cyclotriphosphazene-co-4,4 '- diaminodiphenylsulfone) (PZD) microspheres were synthesi zed by precipitation polymerization of Hexachlorocyclotriphosphazene (HCCP) and polyfunctional organic monomers. The products were characterized by FTIR, SEM-EDS, XPS and bet. The adsorption behavior of PZD microspheres for uranium (VI) in aqueous solution and the influence of adsorption behavior were disc ussed. The results show that the PZD microspheres have a certain adsorption capacity for uranium (VI) in a queous solution. When pH = 3.5, adsorption time is 6h, solid-liquid ratio is 2.0g • L-1 and initial concentration of uranium (VI) is 30mg • L-1, the adsorption rate of uranium reaches the maximum.

scholarly journals Efficient phenol removal from aqueous solution using iron-coated pumice and leca as an available adsorbents: evalution of kinetics and isotherm studies

2018 ◽  
Vol 21 (2) ◽  
pp. 91-97
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Low Cost ◽  
Phenol Removal ◽  
Phenol Adsorption ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Simple Implementation ◽  
Pseudo Second Order ◽  
Isotherm And Kinetic Models

<p>Searching for low cost, accessible, simple implementation, and environmentally friendly adsorbents has been one of the concern of researchers in recent years. Therefore, the aim of this study was to investigate the efficient phenol removal from a synthetic aqueous solution using iron-coated pumice and LECA as an available adsorbents. Bath adsorption experiments were carried out to evaluate the effects of the independent variables such as pH (3-5-7-9-11), initial concentration of phenol (10-50mg/L), contact time (10-60 min) and different concentrations of pumice and LECA (0.2-1 g/100 cc) on the phenol adsorption. The results of the experiments showed that there was a direct relationship between the phenol removal efficiency and increasing the contact time and the adsorbent dosage but it has reverse relationship with the increasing of pH and phenol initial concentration. The optimal condition of parameters for phenol removal were 200 rpm agitation speed, 0.6 g adsorbent dosage, 30 min contact time, and 20 mg/L initial phenol concentration. The study of isotherm and kinetic models showed that the experimental data of the phenol adsorption process were correlated with Freundlich (R2pumice=0.9749, R2LECA=0.9487) and Pseudo-second order (R2pumice=0.9745, R2LECA=0.9486) models. Based on this study’s results, the modified pumice and LECA have a high ability to remove the phenol compounds from aqueous solution.</p>

scholarly journals Functionalization of Synthesized Nanoporous Silica and Its Application in Malachite Green Removal from Contaminated Water

2021 ◽  
Author(s):  
Bahman Hassan-Zadeh ◽  
Reza Rahmanian ◽  
Mohammad Hossein Salmani ◽  
Mohammad Javad Salmani
Keyword(s):  
Adsorption Capacity ◽  
Malachite Green ◽  
Contact Time ◽  
Pollutant Removal ◽  
Nanoporous Silica ◽  
Maximum Adsorption Capacity ◽  
Effective Parameters ◽  
Solution Ph ◽  
Average Pore ◽  
Initial Concentration

Introduction: Nanoporous silica has received growing interest for its unique application potential in pollutant removal. Therefore, the development of a simple technique is required to synthesize and functionalize the nanoporous materials for industrial application. Materials and Methods: The synthesis of nanoporous silica was investigated by the template sol-gel method, and it functionalized as an adsorbent for adsorption of malachite green. The morphology and structure of the prepared and functionalized nanoporous silica were studied using X-ray diffraction, Fourier transform infrared spectroscopy (FT-IR), and nitrogen adsorption-desorption technique. Subsequently, the effective parameters such as solution pH, contact time, and initial concentration on the adsorption process were optimized by adsorption tests. Results: The results showed that high-order nanoporous silica had been produced with an average diameter of 20.12 nm and average pore volume of 1.04 cm3.g−1. It was found that the optimum parameters of pH, initial concentration and contact time for malachite green adsorption on nanoporous silica were 6.5, 10 mg.l-1, and 60 min, respectively. The experimental data confirmed the Freundlich model (R2 = 0.995) and the obtained kinetic data followed the pseudo-first-order equation. The maximum adsorption capacity calculated by Langmuir isotherm was found to be 116.3 mg.g-1. Conclusion: The high adsorption capacity showed that the acid-functionalized nanoporous silica adsorbent can be used as an adequate adsorbent to remove malachite green from aquatic environments. The large surface area can be suggested that the silica nanoporous will have potential application prospects as the adsorbent.

scholarly journals Biosorption Characteristics of Water Hyacinth (Eichhornia crassipes) in the Removal of Nickel (II) Ion under Isothermal Condition

2016 ◽  
Vol 59 (2) ◽  
pp. 118-120
Author(s):  
Chidi Obi ◽  
Sylvester Eigbiremonlen
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Water Hyacinth ◽  
Contact Time ◽  
Eichhornia Crassipes ◽  
Isothermal Condition ◽  
Initial Concentration ◽  
Monolayer Adsorption ◽  
Optimum Ph ◽  
Equilibrium Data

This study was taken to investigate the potentiality of water hyacinth (Eichhornia crassipes) as an alternative biosorbent for the removal of Ni (II) ion from aqueous solution. The optimum pH, contact time and concentration were found to be 6.0, 40 min and 1.0 mg/L under isothermal condition. The biosorption of Ni (II) ion was found to decrease with increasing pH, initial concentration and contact time. Results obtained were analysed with Langmuir and Freundlich biosorption models. The equilibrium data fitted well to the Langmuir biosorption model with correlation coefficient (R2) value of 0.98. The monolayer adsorption capacity was 0.29 mg/g. The removal of Ni (II) ion from aqueous solution using water hyacinth biomass followed a monolayer biosorption.

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