scholarly journals Adsorption Studies of Nitrate by Geo-Physical Environment (Laterite Soil) of the Study Area Bidar Urban & its Industrial Area, Karnataka State, India

2013 ◽  
Vol 11 ◽  
pp. 66-76
Author(s):  
Shivasharanappa ◽  
Padaki Srinivas ◽  
Srinivas Kushtagi
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Nitrate Removal ◽  
Industrial Area ◽  
Sorption Kinetics ◽  
Batch Adsorption ◽  
Laterite Soil ◽  
Optimum Dosage ◽  
Karnataka State ◽  
Optimum Ph

In the present work, adsorption of Nitrate on Laterite soil has been studied using batch adsorption techniques. Main objectives of this study is to study the physical properties of Laterite soil, detection of Nitrate removal by adsorbent Laterite soil as a function of contact time, adsorbent dosage, pH, to study sorption kinetics, and to study isothermal pattern. The results of this study showed that the Optimum contact time, Optimum dosage and Optimum pH for adsorption of Nitrate on Laterite soil reached to equilibrium after 130 minutes, with removal efficiency of 68 %, 1400 mg as optimum dosage and at optimum pH of 6. The rate of adsorption of Nitrate obeys first order rate equation. The obtained results of the batch experiments are best fitted to Langmuir and Freundlich adsorption isotherms. From the experimental analysis it is concluded that Laterite soil shows good removal efficiency and hence can be used as adsorbent.

Utilisation of Biomass and Hybrid Biochar from Elephant Grass and Low Density Polyethylene for the Competitive Adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) from Aqueous Media

2020 ◽  
Vol 13 ◽  
Author(s):  
Joshua O. Ighalo ◽  
Lois T. Arowoyele ◽  
Samuel Ogunniyi ◽  
Comfort A. Adeyanju ◽  
Folasade M. Oladipo-Emmanuel ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Removal Efficiency ◽  
Contact Time ◽  
Competitive Adsorption ◽  
Adsorption Process ◽  
Aqueous Media ◽  
Polluted Water ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Elephant Grass

Background: The presence of pollutants in polluted water is not singularized hence pollutant species are constantly in competition for active sites during the adsorption process. A key advantage of competitive adsorption studies is that it informs on the adsorbent performance in real water treatment applications. Objective: This study aims to investigate the competitive adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) using elephant grass (Pennisetum purpureum) biochar and hybrid biochar from LDPE. Method: The produced biochar was characterised by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The effect of adsorption parameters, equilibrium isotherm modelling and parametric studies were conducted based on data from the batch adsorption experiments. Results: For both adsorbents, the removal efficiency was >99% over the domain of the entire investigation for dosage and contact time suggesting that they are very efficient for removing multiple heavy metals from aqueous media. It was observed that removal efficiency was optimal at 2 g/l dosage and contact time of 20 minutes for both adsorbent types. The Elovich isotherm and the pseudo-second order kinetic models were best-fit for the competitive adsorption process. Conclusion: The study was able to successfully reveal that biomass biochar from elephant grass and hybrid biochar from LDPE can be used as effective adsorbent material for the removal of heavy metals from aqueous media. This study bears a positive implication for environmental protection and solid waste management.

scholarly journals Removal of cadmium from aqueous solutions using excised leaves of Quetta pine (Pinus halepensis Mill.)

2015 ◽  
Vol 43 (3) ◽  
pp. 277-281 ◽  
Author(s):  
M Rahman ◽  
S Gul ◽  
M Ajmal ◽  
A Iqbal ◽  
Akk Achakzai
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Pinus Halepensis ◽  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Adsorption Efficiency ◽  
Cadmium Removal ◽  
Optimum Ph ◽  
Maximum Contact ◽  
Adsorbent Dose

Removal of cadmium from aqueous solution was studied by using Quetta pine (Pinus halepensis Mill.) leaves. Batch adsorption experiments were performed as a function of appropriate equilibrium time, pH, concentration of adsorbate and amount of adsorbent. The optimum pH required for maximum adsorption was found to be 7.0 and the maximum contact time for the equilibrium was 30 minutes at adsorbent dose of 10 g. The maximum adsorption efficiency of cadmium removal was 98.50%. The results were better fitted by Langmuir than Freundlich isotherm. The separation factor of equilibrium 0.12 and 0.67 showed that Quetta pine leaves are good adsorbent of cadmium from aqueous solution DOI: http://dx.doi.org/10.3329/bjb.v43i3.21598 Bangladesh J. Bot. 43(3): 277-281, 2014 (December)

scholarly journals Synthesis of Fe3O4 nanoparticles @Trioctylmethylammonium thiosalicylat (TOMATS) as a new magnetic nanoadsorbent for adsorption of ciprofloxacin in aqueous solution

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Ruhollah Kasraei ◽  
Mohammad Malakootian ◽  
Maryam Mohamadi
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Physical Adsorption ◽  
Sorption Kinetics ◽  
Order Model ◽  
Solution Ph ◽  
Langmuir Adsorption ◽  
Ft Ir ◽  
Real Wastewater ◽  
Adsorbent Dose

AbstractThe aim of this research was to investigate ciprofloxacin (CIP) removal efficiency from aqueous solutions by using Fe3O4 nanoparticles @Trioctylmethylammonium thiosalicylat Ionic liquid (Fe3O4 NP@ TOMATS IL) as a new magnetic nanoadsorbent. The adsorbent was characterized by field emission scanning electron microscope-energy dispersive spectroscopy (FESEM-EDS), mapping, Fourier transform infrared spectroscopy (FT-IR), the Brunauer–Emmett–Teller (BET), X-ray powder diffraction (XRD). The effects of solution pH, adsorbent dose, contact time, initial CIP concentration, and temperature on CIP removal were also investigated. In optimal conditions such as pH = 5.6, CIP concentration = 30 mg/L, adsorbent dose = 0.15 g, temperature = 30 °C, contact time = 90 min, the removal efficiency in synthetic and real wastewater were obtained 87 and 73%, respectively. Batch experiments were carried out to study the sorption Kinetics, thermodynamics, and equilibrium isotherms of CIP with magnetic nanoadsorbent. The results show that all of the above factors influence CIP removal. The Langmuir adsorption isotherm fits the adsorption process well, with the pseudo second-order model describing the adsorption kinetics accurately. The thermodynamic parameters indicate that adsorption is mainly physical adsorption. Recycling experiments revealed that the behavior of adsorbent is maintained after recycling for four times.

scholarly journals Adsorption characteristics of ammonium onto biochar from an aqueous solution

2020 ◽  
Author(s):  
Shamim A. Begum ◽  
A. H. M. Golam Hyder ◽  
Qwanikwia Hicklen ◽  
Taylor Crocker ◽  
Ben Oni
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Wood Chips ◽  
Ammonium Concentration ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Ammonium Removal ◽  
Adsorption Characteristics ◽  
A Value ◽  
Optimum Ph

Abstract Ammonium contamination in water is a major concern worldwide. This study focuses on the removal of ammonium from aqueous solution by batch adsorption experiments using biochar derived from a combination of various wood chips (spruce, pine, and fir). Adsorption characteristics of ammonium onto biochar were evaluated as a function of biochar dosages, initial concentrations of ammonium, contact time and pH. Results demonstrated that ammonium removal increased with the increase of biochar dosage. The percentage of ammonium removal reached a value of 80% at a biochar dosage of 100 g/L. Ammonium removal decreased by 15% with the increase of initial ammonium concentration by 50 mg/L. The optimum pH for ammonium removal was considered in the range from 6 to 8. Ammonium removal reached its stable value within 3 days. The maximum adsorption capacity of ammonium was 0.96 mg/g for 80 mg/L of initial ammonium concentration. The adsorption isotherm followed both the Langmuir and Freundich models for ammonium adsorption onto biochar. Fourier Transform Infrared (FTIR) spectroscopy results indicated the presence of amine, amide and nitrile functional groups on the surface of biochar which could contribute to the adsorption of ammonium onto biochar. Thus, biochar derived from various wood chips showed the potential to remove ammonium from aqueous solution.

scholarly journals Evaluate the effectiveness of the UV/ persulfate process to remove catechol from solution aqueous

2021 ◽  
Keyword(s):  
Data Analysis ◽  
Aqueous Solutions ◽  
Uv Radiation ◽  
Removal Efficiency ◽  
Design Of Experiment ◽  
Contact Time ◽  
Batch Reactor ◽  
Acidic Ph ◽  
Optimum Conditions ◽  
Optimum Ph

<p>Catechol is used as an antioxidant, fungicide, and polymerization inhibitors in a variety of industries such as petrochemical. Catechol must be removed from effluents before it enters to environment. This study aimed to investigate combined UV radiation and persulfate process in removal of catechol from aqueous solutions. All experiments were performed in a batch reactor. Data analysis were done with Design of Experiment (DoE) software. The effects of various variables such as pH, initial persulfate concentration, and initial Catechol concentration were investigated. The findings indicated with increases in persulfate concentration and decrease in catechol concentrations, the removal efficiency increased. Acidic pH and UV radiation were the leading factors in removal of catechol. The optimum pH, persulfate concentration, and catechol concentration were obtained 7, 0.04 M, and 100 mg l-1, respectively. More removes of catechol was achieved in optimum conditions within contact time of 60 min. The synergic effects of UV and persulfate radical were about 88%. Approximately 60% of catechol was mineralized within contact time of 60 min. Persulfate radicals resulting from UV/S2O82- were the main effective oxidants in removal and mineralization of catechol. Owing to high removal efficiency of persulfate compounds which are, also, abundant and inexpensive, these can be applied in removal of persistent organic pollutants from aqueous solutions.</p>

Isotherm and Kinetic Models for Bio-sorption of Cadmium Ions from Aqueous Solutions using Dry Peanut Shells and Hazelnut Shells

2018 ◽  
Vol 69 (10) ◽  
pp. 2603-2607
Author(s):  
Firas Hashim Kamar ◽  
Salman H. Abbas ◽  
Asem Hassan Mohammed ◽  
Mihaela Emanuela Craciun ◽  
Aurelia Cristina Nechifor
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Room Temperature ◽  
Sorption Kinetics ◽  
Initial Concentration ◽  
Several Variables ◽  
Peanut Shells ◽  
Before And After ◽  
Isotherm And Kinetic Models ◽  
Hazelnut Shells

This work is aiming to investigate the removal Cd(II) ions from the aqueous solution using two types of biosorbent materials: peanut shells (PS) and hazelnut shells (HS). The effect of several variables on the batch bio-sorption was studied. The process was carried out at room temperature, shacking speed 200 rpm and using fixed adsorbent diameters of 0.75 mm. The highest removal efficiency of Cd(II) ions onto PS was 91.45% in the best conditions (pH=3, initial concentration of Cd(II) ions 50 mg/ L, amount adsorbent was 0.75 g, contact time was 120 min), while the highest removal efficiency when using HS was 85.62% at pH= 4, and contact time of 160 minutes using the same initial concentration of Cd(II) ions as well as the same amount of absorbent material. Isotherm was studied for bio-sorption of Cd(II) ions using these two adsorbents, and the pseudo- first and second order models were used to study bio-sorption kinetics. The results of the infrared spectroscopy (FTIR) of (PS) and (HS) samples before and after loading for Cd(II) ions showed that hydroxyl and carboxyl groups play a major role in bio-sorption of these ions.

Cu2+ Removal by Hydroxyapatite Nanorods Prepared by Surfactant-Templated Method

2013 ◽  
Vol 807-809 ◽  
pp. 1258-1261
Author(s):  
Shao Hong Wang ◽  
Jian Guo Xia ◽  
Mei Han Wang ◽  
Zhao Xia Hou ◽  
Xiao Dan Hu ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Adsorption Process ◽  
Adsorption Property ◽  
Copper Ion ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Copper Adsorption ◽  
Initial Adsorption ◽  
Templated Method

Nanohydroxyapatite (HA) with rod-like shape was synthesized by a cationic surfactant-templated method. Batch adsorption experiments were conducted to investigate its copper adsorption property from aqueous solution. The effect of initial copper ion concentration and contact time were studied. Results showed that HA adsorption capacity increased from 25.6 mg/g to 81.4 mg/g with the increase of initial copper ion concentration from 20 mg/L to 200 mg/L. Meanwhile, the removal efficiency decreased from 64.1% to 20.3%. Moreover, it also revealed that the removal efficiency of Cu2+increased with the increasing contact time and the initial adsorption process is rapidly increased within 15 min and the equilibrium was attained after 15 min.

scholarly journals Development of Indigenous Iron-Coated Pottery Granules for Arsenic (V) Removal from Groundwater

2020 ◽  
Vol 18 (02) ◽  
pp. 127-132
Author(s):  
Khadija Qureshi ◽  
Kashif Hussain Mangi ◽  
Zulfiqar Ali Solangi ◽  
Zulfiqar Ali Bhatii ◽  
Mukhtiar Ali ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Contact Time ◽  
Arsenic Removal ◽  
Mixing Time ◽  
Underground Water ◽  
Batch Adsorption ◽  
Physical Parameters ◽  
Adsorbate Concentration ◽  
The Impact ◽  
Maximum Removal

Arsenic is a carcinogenic element capable to get into water bodies and drinking water supplies from natural deposits and industrial practices. Its presence in drinking underground water is highly toxic to human health. The study is focused on the development of indigenous Iron-Coated Pottery Granules (ICPG) to remove As from groundwater of Hala City. The developed ICPG was agitated with local clay white flour and water. A low-cost adsorbent namely ICPG was synthesized for the expulsion of As from underground water. The ICGP was characterized with SEM and FTIR techniques. Furthermore, the impact of physical parameters including adsorbate concentration, dosage, mixing time, pH, and contact time on As removal efficiency was investigated in batch experiments. The maximum removal efficiency was achieved with an adsorbent dosage of 0.5 grams at pH =7 for a contact time of 90 minutes when agitated at a speed of 150 r/min. The arsenic removal efficiency was found highly dependent on contact time increase and optimum pH (maximum removal achieved at strong adsorption of As at pH 4–7), however, the rise of adsorbate concentration resulted in the decrement in the efficiency after certain range. Batch adsorption study of underground water sample collected from Hala, Sindh, Pakistan was performed with satisfactory results, i.e. 94 arsenic removal from water. All the water samples were analyzed through atomic absorption Spectrophotometer. The investigation has indicated that ICPG is an exceptionally favourable material for As removal from drinking underground water and can be applied to handle the arsenic issue in most of the regions of Sindh province.

scholarly journals Efficient Loading of Mano Mn Particles On Calcined Laterite Soil (Lt-nMn) For Higher Removal of As(III) Ions From Groundwater: Adsorption And Eco-Scale Analysis

2021 ◽  
Author(s):  
Roshan Prabhakar ◽  
Somaparna Ghosh ◽  
Ali Malik ◽  
Sukha Ranjan Samadder
Keyword(s):  
Removal Efficiency ◽  
Chemical Reduction ◽  
Base Material ◽  
Oxidation Mechanism ◽  
Sorption Isotherms ◽  
Sorption Kinetics ◽  
Order Kinetic ◽  
Laterite Soil ◽  
Nano Coating ◽  
Method Of Production

Abstract Occurrence of arsenic in the groundwater has become a cause for concern in many countries. The presence of As(III) species in the groundwater had been one of the biggest challenges for the water workers especially in the south east Asian countries. Nano based adsorption techniques are gaining attention among researchers for the removal of arsenic ions. However, synthesis of nano-adsorbents is a costly affair. Therefore, the present study utilized the cheap and readily available laterite soil as a base material for nano coating. Nano sized manganese (nMn) particles were synthesized by chemical reduction method and later coated on calcined laterite (Lt-nMn). Coating with 0.1 M nMn provided the best As(III) removal efficiency. The prepared material was characterised for its morphological and surface properties. Phase analysis using XRD (X-ray diffraction) showed the presence of zero valent manganese species, which assisted in adsorption. Adsorption studies were conceded by selecting the different affecting parameters such as contact time, concentration, dose, temperature, and pH. Very high removal in less time regime led to the investigation of the oxidation mechanism. Phosphate and sulphate anions insignificantly reduced the removal efficiency. Langmuir model for the sorption isotherms and pseudo-second order kinetic model for the sorption kinetics symbolized the experimental data. Sustainability studies in terms of eco-scaling and cost analysis were performed for the applied method of production of the nano materials. Adsorber design analysis was also conducted to estimate the required amount of Lt-nMn particles for achieving the desired equilibrium As(III) concentration.

scholarly journals Removal of Tartrazine Dye Using Kyllinga Brevifolia Extract And Silver Nanoparticles As Catalysts

2021 ◽  
Vol 2129 (1) ◽  
pp. 012033
Author(s):  
Azzam Saiful Azhar ◽  
Wan Zuraida Wan Kamis ◽  
Haslinda Abdul Hamid ◽  
Nur Fadzeelah Abu Kassim ◽  
Norain Isa
Keyword(s):  
Silver Nanoparticles ◽  
Removal Efficiency ◽  
Contact Time ◽  
Dye Removal ◽  
Batch Mode ◽  
Initial Concentration ◽  
Optimum Ph

Abstract The objective of this study was to determine the effectiveness of kyllinga brevifolia (KB) with silver nanoparticles (AgNPs) as catalysts in the removal of tartrazine dye. The experiment was carried out in batch mode. Different parameter such as temperature, initial concentration, contact time and pH were studied. It was found that the equilibrium was achieved in 20 min and the optimum pH was 2. The removal of dye highest at 80 °C, which is 64%. From an initial concentration of 60 ppm and onwards, the removal efficiency of dye was the most (62.34%) when compared to other intial concentrations. The use of a AgNPs as catalyst increases the removal efficiency 20.68% more effective than without a catalyst. Significant of this study is to show the effect of AgNPs as catalyst in tartrazine dye removal from wastewater.

Sign in / Sign up

Export Citation Format

Share Document