Powdered and beaded lemon peels-doped iron (III) oxide-hydroxide materials for lead removal applications: synthesis, characterizations, and lead adsorption studies

Lead adsorption by green Enteromorpha algae was studied. Adsorption capacity was 83.8 mg/g at pH 3.0 with algae (E) and 1433.5 mg/g for silicates modified algae (EM). FTIR and thermal analysis of algae materials were studied. Thomas and Yoon-Nelson column model were best for adsorbent (E) and algae after reflux (ER) and Yan model for (EM) with capacity 76.2, 71.1, and 982.5 mg/g, respectively. (ER) and (EM) show less swelling and better flow rate control than (E). Nonlinear methods are more appropriate technique. Error function calculations proved valuable for predicting the best adsorption isotherms, kinetics, and column models.

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Mespilus germanica (MG) and Tribulus terrestris (TT) Used as Biosorbents for Lead Removal from Aqueous Solutions: Adsorption Kinetics and Mechanisms

Advances in Materials Science and Engineering ◽

10.1155/2021/8436632 ◽

2021 ◽

Vol 2021 ◽

pp. 1-13

Author(s):

Majid Ehteshami ◽

Hamidreza Zolfaghari ◽

Marjan Salari ◽

Ehsan Teymouri

Keyword(s):

Aqueous Solutions ◽

Correlation Coefficient ◽

Lead Removal ◽

Tribulus Terrestris ◽

Optimum Conditions ◽

Effective Parameters ◽

Lead Adsorption ◽

Proposed Model ◽

Central Composite ◽

Solution Volume

Today, most countries around the globe are facing water resources restrictions, and it is predicted freshwater resources will be more valuable than oil wells in the next century. In the present study, the ability of lead removal using both powders of Mespilus germanica (MG) and Tribulus terrestris (TT) seeds and optimization of the adsorption process have been investigated. Four main parameters were selected for experimental design, namely, pH, time of contact, the ratio of adsorbent to solution volume, and initial concentration of lead in solution, and the optimization of effective parameters on lead adsorption was performed based on central composite design (CCD) under response surface methodology (RSM). According to the statistical results, the proposed model for MG and TT is confirmed with 0.95 and 0.96 correlation coefficient and 0.92 and 0.94 adjusted correlation coefficient, respectively. The results of parameter optimization also showed that both adsorbents have the acceptable ability to adsorb lead from aqueous solutions. Under the optimum conditions with the initial lead concentration of 10 mg/l, MG powder had better performance in lead adsorption of 96.04%, and TT powder also had an acceptive performance of 93.20%. Moreover, the MG and TT adsorbents have the most accordance with the Freundlich and D-R isotherms, respectively.

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Removal of Lead Ions from Water Using Pellet Generated from Bacillus subtilis Isolated from Gold Mining Site in Niger State

UMYU Journal of Microbiology Research (UJMR) ◽

10.47430/ujmr.2161.014 ◽

2021 ◽

Vol 6 (1) ◽

pp. 105-112

Author(s):

A. J. Gana ◽

◽

M. B. Tijjani ◽

Y. Ocholi ◽

E. O. Akinyelure

Keyword(s):

Bacillus Subtilis ◽

Removal Efficiency ◽

Gold Mining ◽

Lead Ions ◽

Lead Removal ◽

Dead Cell ◽

Mining Site ◽

Lead Adsorption ◽

Physical Conditions ◽

Adsorption Removal

This work concentrated on the isolation of lead tolerant strains of bacteria, identification of the isolated strain with the highest lead tolerance capacity using microgen identification kit. Also, the efficacy of the generated pellet (dead cell) in the bioremoval of lead from aqueous solutions was determined. A total of nine bacteria were isolated from soil collected from gold mining site in Kontagora metropolis, Niger State. Of the nine isolates, only Bacillus subtilis (KO1) possess high tolerance capacity for high levels of lead ions. The pellet generated from the Bacillus subtilis (KO1) strain was then used to adsorb lead ions from synthetic ion solutions. The isolate's removal efficiency was enhanced by optimizing several physical conditions (pH, temperature, initial lead concentration and contact time). The best optimized adsorption removal efficiency (>90%) was found at pH 3, temperature 40oC with 100 mg/L of initial concentration of lead after 3 hours of treatment. The use of the pellet generated from eco-friendly Bacillus subtilis (KO1) has great potential and additional benefits in terms of lead removal. Keywords: Bacillus subtilis; lead; adsorption; pellet; optimization

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Graphene oxide and thiol functionalized natural zeolite for the removal of lead from water

Water Science & Technology Water Supply ◽

10.2166/ws.2020.156 ◽

2020 ◽

Vol 20 (7) ◽

pp. 2577-2588

Author(s):

Mohsen Manjili ◽

Marcia R. Silva ◽

David Garman ◽

Hai-Feng Zhang

Keyword(s):

Graphene Oxide ◽

Theoretical Calculations ◽

Ph Effect ◽

Kinetic Mechanism ◽

Sorption Kinetics ◽

Lead Removal ◽

Solution Ph ◽

Lead Adsorption ◽

Removal Capacity ◽

Functionalized Materials

Abstract Materials with potentially enhanced adsorption properties were developed by functionalizing natural clean clinoptilolite zeolite (CZ) to fabricate graphene oxide coated zeolite (GOZ) and cystamine dihydrochloride zeolite (CDHZ). The functionalized materials were characterized with Fourier transform infrared spectroscopy (FTIR), Raman, thermogravimetric analysis (TGA), and a scanning electron microscope (SEM) equipped with X-ray spectroscopy (EDS) techniques. The solution pH effect on removal efficiency was investigated at acidic, neutral, and basic pH levels. All adsorbent materials showed the highest adsorption capacities at neutral pH. Experiments were used to assess efficacy for the removal of lead with the sorption kinetics and the adsorption isotherms being determined for the baseline material CZ and treated zeolites. The addition of graphene oxide and thiol functional groups increased the lead removal capacity of natural clean zeolite by 16.81% and 34.53%, respectively. Diffusion studies revealed that the overall lead adsorption process is a particle diffusion process. Theoretical calculations confirmed the pseudo-second-order model as the kinetic mechanism for lead adsorption for CZ, GOZ and CDHZ.

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Iron oxide/hydroxide (α,γ-FeOOH) nanoparticles as high potential adsorbents for lead removal from polluted aquatic media

Journal of Industrial and Engineering Chemistry ◽

10.1016/j.jiec.2014.07.039 ◽

2015 ◽

Vol 23 ◽

pp. 33-43 ◽

Cited By ~ 89

Author(s):

Safoora Rahimi ◽

Rozita M. Moattari ◽

Laleh Rajabi ◽

Ali Ashraf Derakhshan ◽

Mohammad Keyhani

Keyword(s):

Iron Oxide ◽

High Potential ◽

Lead Removal ◽

Oxide Hydroxide

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Lead adsorption and subsequent gasification with Pinus elliottii waste

Management of Environmental Quality An International Journal ◽

10.1108/meq-04-2016-0033 ◽

2017 ◽

Vol 28 (6) ◽

pp. 839-850

Author(s):

Jhonatas Antonelli ◽

Cleber Antonio Lindino ◽

Reinaldo Aparecido Bariccatti ◽

Samuel Nelson Melegari Souza ◽

Anderson Miguel Lenz

Keyword(s):

Aqueous Medium ◽

Synthesis Gas ◽

Removal Rate ◽

Fixed Bed ◽

Pinus Elliottii ◽

Average Concentration ◽

Gas Analysis ◽

Lead Removal ◽

Lead Adsorption ◽

Content Type

Purpose The purpose of this paper is to investigate the use of Pinus wood waste in lead adsorption as a remediation technique in aqueous medium and its subsequent use in obtaining synthesis gas. Design/methodology/approach The capacity of the timber in the lead adsorption was studied in aqueous medium at various pH, determining the amount adsorbed in equilibrium. Then, the same timber was added in a fixed bed, co-current flow of two stage gasifier type, working temperature of 900°C, for obtaining synthesis gas. The synthesis gas composition was evaluated by the spectrophotometry in the infrared region and the gas chromatography and lead content in the ash and gas was determined by the atomic absorption spectrophotometry. Findings In laboratory tests carried out, the optimal pH for lead removal was pH 4 with 96.15 percent removal rate, reaching equilibrium after 180 min. In pilot scale the lead removal after 72 hours was 96 percent. The average production of syngas was 11.09 m³h−1. For tests with the motor-generator, the best condition occurred with charge of 2.0 kW, wherein gas consumption per kW produced reached 4.86 m³ kW−1, resulting in a 14.81 percent efficiency rate. The gas analysis showed an average concentration of 14.85 percent H2, 30.1 percent CO2, and 50.49 percent of atmospheric air. The concentration of lead in the gas was below the limit established by law. Pinus elliottii waste proved to be an excellent adsorbent, with removing more than 96 percent of the Pb ion present in aqueous solution and a starting material in the gasifier to generate synthesis gas. Research limitations/implications This paper describes the waste wood application in the treatment of contaminated environments and for obtaining syngas providing a sustainable process. Originality/value This paper shows a process that combines the remediation of contaminated environmental with power generation systems, allowing efficient management of contaminated environments.

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Enhancing lead adsorption in waste lubricant oil with activated clay as bleaching earth

MATEC Web of Conferences ◽

10.1051/matecconf/201927606020 ◽

2019 ◽

Vol 276 ◽

pp. 06020

Author(s):

Dini Kemala ◽

Setyo Sarwanto Moersidik ◽

Sandyanto Adityosulindro ◽

Firsta Hilwa

Keyword(s):

Contact Time ◽

Adsorption Process ◽

Bleaching Earth ◽

Lead Removal ◽

Adsorption Efficiency ◽

Lead Adsorption ◽

Lubricant Oil ◽

Adsorption Condition ◽

Polycyclic Aromatic ◽

Waste Lubricant Oil

Waste lubricant oil is categorized as hazardous waste that contains several contaminants such as polycyclic aromatic hydrocarbon, chlorinated hydrocarbon, and heavy metals. Among these contaminants, lead has been known as one of the contributive contaminants in used lubricant oil in varied concentrations. To remove this contaminant, adsorption process was carried out by using clay as natural adsorbent (bleaching earth). In order to enhance the adsorption efficiency, the clay was activated by acidification with 1 M, 1.5M, 2 M H2SO4 or calcination in the temperature 300°C, 450°C, 600°C. The activated clay indicated the increase of montmorillonite percentage in clay up to 68% and clay’s surface area up to 67 m2/g from its origin characteristics. The adsorption process showed notable improvement of clay adsorption capacity in removing lead in shorter contact time. The lead removal curve showed that the optimum adsorption condition can be obtained by the use of activated clay with 1.5 M H2SO4 and calcined in temperature 450°C. The optimum adsorption contact time with acid and calcination activated clay was 30 minutes and 180 minutes respectively.

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Carbonaceous Adsorbent Derived from Sulfur-Impregnated Heavy Oil Ash and Its Lead Removal Ability from Aqueous Solution

Processes ◽

10.3390/pr8111484 ◽

2020 ◽

Vol 8 (11) ◽

pp. 1484

Author(s):

Takaaki Wajima

Keyword(s):

Heavy Oil ◽

Potassium Hydroxide ◽

Maximum Adsorption Capacity ◽

Lead Removal ◽

Lead Adsorption ◽

Freundlich Model ◽

N2 Atmosphere ◽

Potassium Sulfide ◽

Better Than ◽

Carbonaceous Adsorbent

A novel carbonaceous adsorbent was prepared from sulfur-impregnated heavy oil ash via pyrolysis using potassium sulfide (K2S) solution, and its ability to remove lead (Pb2+) from aqueous solutions was examined. It was compared with an adsorbent synthesized by conventional pyrolysis using potassium hydroxide (KOH) solution. Specifically, the raw ash was immersed in 1 M K2S solution or 1 M KOH solution for 1 day and subsequently heated at 100–1000 °C in a nitrogen (N2) atmosphere. After heating for 1 h, the solid was naturally cooled in N2 atmosphere, and subsequently washed and dried to yield the product. Regardless of the pyrolysis temperature, the product generated using K2S (Product-K2S) has a higher sulfur content than that obtained using KOH (Product-KOH). Moreover, Product-K2S has a higher lead removal ability than Product-KOH, whereas the specific surface area of the former is smaller than that of the latter. Product-K2S obtained at 300 °C (Product-K2S-300) achieves the highest lead adsorption and a high selective lead removal from a ternary Pb2+–Cu2+–Zn2+ solution. The equilibrium capacity of Product-K2S-300 was found to fit the Langmuir model better than the Freundlich model, and its calculated maximum adsorption capacity is 0.54 mmol/g. From the ternary Pb2+–Cu2+–Zn2+ solution, the order of adsorption by Product-K2S-300 is Pb2+ > Cu2+ > Zn2+, and the removal of Pb2+ and Cu2+ increases as the pH of the solution increases.

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Adsorption of Lead Ions from Aqueous Solutions Using Gamma Irradiated Minerals

Journal of Chemistry ◽

10.1155/2016/8782469 ◽

2016 ◽

Vol 2016 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

Julián Cruz-Olivares ◽

Gonzalo Martínez-Barrera ◽

César Pérez-Alonso ◽

Carlos Eduardo Barrera-Díaz ◽

María del Carmen Chaparro-Mercado ◽

...

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Magnesium Silicate ◽

Correlation Factor ◽

Lead Removal ◽

Order Kinetic ◽

Lead Adsorption ◽

Order Kinetic Model ◽

Calcium Magnesium ◽

Gamma Irradiated

For the first time, an irradiated mineral was used as a novel modified adsorbent for lead removal of aqueous solutions. The effects of gamma radiation doses and temperature on the lead adsorption capacity of an unknown mineral were evaluated. The results show that, in the chemisorption process, the highest adsorption capacity (9.91 mg/g) and the maximum percentage of lead removal (99.1%) were reached at 40°C when using an irradiated mineral at 150 kGy. The improvement on the lead adsorption speed was the most important feature of the irradiated mineral. The experimental results were successfully correlated with the pseudo second-order kinetic model. For all results, the average absolute relative deviations (AARD) were less than 13.20%, and the correlation factor (r2) was higher than 0.998. Moreover, the average values of the thermodynamic parameters (ΔG0=-10612 J/mol, ΔH0=-12360 J/mol, and ΔS0=171 J/mol K) suggest the feasibility of the proposed process, in terms of the endothermic and irreversible chemisorption results; moreover, ion exchange was evaluated through the EDS results. The X-ray diffraction analysis showed that the unknown irradiated mineral is mainly composed of quartz (SiO2), calcite (CaCO3), and calcium magnesium silicate (Ca0.15Mg0.85) Mg (SiO6).

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