Reduction and Biosorption of Cr from Aqueous Solution Using Banana Skin

2012 ◽  
Vol 518-523 ◽  
pp. 2708-2711 ◽  
Author(s):  
Ming Zhou ◽  
Hang Xu ◽  
Shu Fa Zhu ◽  
Ya Na Liu
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Low Cost ◽  
Experimental Results ◽  
Initial Concentration ◽  
Effects Of Ph

The possible use of biowaste-banana skin as an alternative, low-cost biosorbent and reductant for removal of Cr from aqueous solutions was investigated. Effects of pH, contact time, Cr(VI) initial concentration and temperature on the reduction and biosorption of Cr by banana skin were studied. Experimental results showed that 1 g of dried banana skin could reduce about 230 mg of Cr(VI) to Cr(III), at the condition of 30°C, pH 2 and 300 rpm. The maximum Qeq of Cr(III) by banana skin was 6.3mg g-1 at the Cr(VI) initial concentration of 200mg L-1, 30°C , pH 2 and 300 rpm.

scholarly journals ADSORPTION OF FLUORIDE USING SIO2 NANOPARTICLES AS ADSORBENT

2020 ◽  
Vol 2 (2) ◽  
pp. 1-9
Author(s):  
Davoud Balarak ◽  
Yousef Mahdavi ◽  
Ali Joghatayi
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Sio2 Nanoparticles ◽  
Second Order ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Initial Concentration ◽  
High Doses

Presence of Fluoride in water is safe and effective when used as directed, but it can be harmful at high doses. In the present paper SiO2 nanoparticles as a adsorbent is used for removal of fluoride from aqueous solution. The effect of various operating parameters such as initial concentration of F-, Contact time, adsorbent dosage and pH were investigated. Equilibrium isotherms were used to identify the possible mechanism of the adsorption process. Maximum adsorption capacity of the SiO2 nanoparticles was 49.95 mg/g at PH=6, contact time 20 min, initial concentration of 25 mg/L, and 25±2 ◦C temperatures, when 99.4% of Fwere removed. The adsorption equilibriums were analyzed by Langmuir and Freundlich isotherm models. It was found that the data fitted to Langmuir (R2=0.992) better than Freundlich (R2=0.943) model. Kinetic analyses were conducted using pseudo first-and second-order models. The regression results showed that the adsorption kinetics was more accurately represented by a pseudo second-order model. These results indicate that SiO2 nanoparticles can be used as an effective, low-cost adsorbent to remove fluoride from aqueous solution.

scholarly journals The Kinetics and Thermodynamics studies of the biosorption of Chromium (III) ions from aqueous solution using groundnut husk

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Olaniyi K Yusuff ◽  
Abdulrahman A. Mukadam ◽  
Adenike M.o Abdulraheem ◽  
Aanuoluwapo Akerele
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Contact Time ◽  
Low Cost ◽  
Ion Concentration ◽  
Biosorption Process ◽  
Adsorption Analysis ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Physical And Chemical

The biosorption of Cr (III) ions from aqueous solutions by groundnut husk, a low-cost biosorbent was studied on a laboratory scale batch experiments. The effects of pH, contact time, particle size, biosorbent dosage and temperature on the adsorption of Cr (III) ions were investigated. Determination of Chromium ion concentration in solution was done using Atomic Absorption Spectrophotometer (AAS). The results show that the removal mechanism is predominantly by chemisorption and it is dependent on the physical and chemical characteristics of the biosorbent material. From the initial concentration of 0.5 mM, optimum Cr (III) ions removal was obtained at pH of 4, particle size of 0.15 nm, contact time of 180 minutes and biosorbent dosage of 50 mg, with the highest biosorption efficiency of 81.15 %. The biosorption process was best described by the BET adsorption isotherm with R2 value 0.9814 indicating multiplayer adsorption. Analysis of the experimental data revealed that the biosorption of Cr (III) ions from aqueous solution by groundnut husk is a spontaneous process with a ?Go value of -24.38 kJmol-1 at 298 K and follow the pseudo second order kinetics with a rate constant of 0.0151 min-1. The results indicate that groundnut husk can be employed as a low cost alternative to commercial adsorbents in the removal of Cr (III) ions from wastewater.

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.

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>

Adsorption of Cr (VI) from Aqueous Solution by Purified Attapulgite

2014 ◽  
Vol 1051 ◽  
pp. 583-587
Author(s):  
Ling Tao ◽  
Xiao Wei Song ◽  
Jian Li Yuan ◽  
Jun Ren ◽  
Yan Zhuo Zhang
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Order Equation ◽  
Langmuir Model ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Equilibrium Adsorption Isotherm ◽  
Good Agreement

Adsorption of Cr6+ onto purified attapulgite was investigated with respect to temperature, initial concentration and contact time. The kinetics data related to the adsorption of chromium from aqueous solutions are in good agreement with the pseudo-second order equation in ranges of initial concentration of 20~200 mg/L, and temperature of 298~328K. The thermodynamic experiment results show that the equilibrium adsorption isotherm was closely fitted with the Langmuir model.

Removal of Lead Ions from Aqueous Solutions by a Novel Ficus carica L.-Zeolite-Alginate Biocomposite

2018 ◽  
Author(s):  
Meruyert KAYGUSUZ ◽  
Cem GÖK
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Adsorption Process ◽  
Lead Concentration ◽  
Ficus Carica ◽  
Lead Ions ◽  
Adsorption Potential ◽  
Initial Concentration ◽  
Effects Of Ph ◽  
Potential Maximum

In this study, fig leaves, zeolite and alginate were used to prepare a biocomposite for the adsorption of Pb(II) ions. Effects of pH, temperature, initial lead concentration and contact time on the adsorption process have been investigated. The amount of adsorbed lead per gram of sorbent was found to be approximately 150.3 mg/g. The prepared biocomposite possesses promising adsorption potential. Maximum uptake of Pb(II) ions (85%) has been achieved at pH 6, with 25 mg/L of initial concentration and at a temperature of 288.15 K. The data correlated well with Freundlich and D-R models. The adsorption was physical in nature.

Biosorption of As(V) from aqueous solutions by living cells of Bacillus cereus

2012 ◽  
Vol 66 (8) ◽  
pp. 1699-1707 ◽  
Author(s):  
A. K. Giri ◽  
R. K. Patel ◽  
P. C. Mishra
Keyword(s):  
Aqueous Solutions ◽  
Bacillus Cereus ◽  
Contact Time ◽  
Living Cells ◽  
Optimum Conditions ◽  
Order Model ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Biomass Dosage ◽  
Batch Biosorption

In this work, the biosorption of As(V) from aqueous solutions by living cells of Bacillus cereus has been reported. The batch biosorption experiments were conducted with respect to biosorbent dosage 0.5 to 15 g/L, pH 2 to 9, contact time 5 to 90 min, initial concentration 1 to 10 mg/L and temperature 10 to 40 °C. The maximum biosorption capacity of B. cereus for As(V) was found to be 30.04 at pH 7.0, at optimum conditions of contact time of 30 min, biomass dosage of 6 g/L, and temperature of 30 ± 2 °C. Biosorption data were fitted to linearly transformed Langmuir isotherms with R2 (correlation coefficient) &gt;0.99. Bacillus cereus cell surface was characterized using AFM and FTIR. The metal ions were desorbed from B. cereus using both 1 M HCl and 1 M HNO3. The pseudo-second-order model was successfully applied to predict the rate constant of biosorption.

scholarly journals Organic Dyes Adsorption on the Almond Shell (Prunus dulcis) as Agricultural Solid Waste from Aqueous Solution in Single and Binary Mixture Systems

2021 ◽  
Vol 12 (2) ◽  
pp. 2022-2040
Keyword(s):  
Aqueous Solution ◽  
Binary Mixture ◽  
Contact Time ◽  
Binary Systems ◽  
Organic Dyes ◽  
Low Cost ◽  
Kinetic Studies ◽  
Prunus Dulcis ◽  
Order Kinetic ◽  
Almond Shell

Almond shell (AS) is a low-cost adsorbent used in this study for the removal of methylene blue (MB), crystal violet (CV), and Congo red (CR) from an aqueous solution in single and mixture binary systems. The low-cost adsorbent was characterized by FTIR and SEM analysis. The effects of AS dose, contact time, initial dye concentration, pH, and temperature on MB, CV, and CR adsorption were studied in a single system. In a binary system, the MB, CV, and CR were removed from the mixture of MB+CR, CV+MB, and CV+CR with a percentage in volume ranging from 0 to 100 % in MB and CV, and CR. Kinetic studies showed rapid sorption following a second-order kinetic model with of contact time of 10 min. The modulation of adsorption isotherms showed that retention follows the Langmuir model. The thermodynamic parameters proved that the MB, CV, and CR adsorption process was feasible, spontaneous, and exothermic. The synergy adsorption between dyes in a binary mixture of MB+CR and CV+CR, while the competition adsorption between dyes in a binary mixture of MB+ CV.

scholarly journals Adsorption of Cu(II) on maghnite from aqueous solution: Effects of pH, initial concentration, interaction time and temperature

2012 ◽  
Vol 04 (11) ◽  
pp. 856-868 ◽  
Author(s):  
Mohamed Amine Zenasni ◽  
Said Benfarhi ◽  
André Merlin ◽  
Stéphane Molina ◽  
Béatrice George ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Interaction Time ◽  
Initial Concentration ◽  
Effects Of Ph
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