Adsorption of Lead and Cadmium Ions From Aqueous Solutions by Modified Oil Shale Ash

Zhu, Bolin; Xiu, Zongming; Liu, Na; Bi, Haitao; Lv, Chunxin

doi:10.3176/oil.2012.3.06

Cited by 12 publications

(5 citation statements)

References 14 publications

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“…So that, higher reaction time of 24 h is not recommended for shale. Similar trails have been done [21] using alkali-treated oil shale ash as adsorbent to remove lead and cadmium ions from aqueous solutions. They reported that adsorption of lead and cadmium ions by the modified oil shale ash depended on adsorbent concentration, ash particle size, contact time and pH of solution.…”

Section: Shalementioning

confidence: 72%

Removal of Lead and Cadmium from Polluted Water Using Environmentally Safe Materials

Helal

2014

IJPSS

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Heavy metals that exist in municipal wastewater can cause many problems for human hygiene and environment. Therefore, the metals need to be removed from wastewater before being used in irrigation. Materials of high surface reactivity; such as alginit, shale and iron oxide are used as potential sorbents to eliminate Pb and Cd from polluted water. In remediation studies, these materials were added to Pb and Cd polluted water at addition ratios of 1:10000, 1:1000 and 1:100 (remedy agents: polluted water). The mixtures were then gently agitated and submitted to different equilibrium periods of 1, 5 and 24 h. The results showed the efficiency of tested agents (shale, alginit, and iron oxide) in the removal of Pb and Cd from polluted water containing various concentrations of 5, 10 and 50 mg/l. Shale was able to reduce Pb and Cd concentration from 5 to 1.14 and 0.34 mg/l, respectively, in a reaction period of one hour. Shale, alginit and iron oxide, reduced the initial concentration of; 10 mg Pb/l to 0.98, 0.46 and 0.57 mg/l; and of 50 mg Pb/l to 0.21, 6.5 and 1.68 mg/l; respectively. Shale was the most effective material in decontamination of heavy metals polluted water and it could be recommended to be used to decontaminate wastewater. This research aims to use a non expensive, environmentally safe, and efficient technique to remove heavy metals from industrial wastewater to leave them free and suitable for discharging to sanitary sewer system.

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Section: Shalementioning

confidence: 72%

Removal of Lead and Cadmium from Polluted Water Using Environmentally Safe Materials

Helal

2014

IJPSS

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“…The empirical proposed model of the two-parameter Langmuir isotherm for gas-solid physical interaction is employed for different adsorbents [4][5][6]28]. The proposed model isotherm that can be written in its linear form which is amenable to linear kinetics analysis is:…”

Section: Langmuir Isothermmentioning

confidence: 99%

“…There are two types of adsorption isotherms most frequently used by researchers. The Langmuir and Freundlich adsorption isotherm models were employed to analyze the experimental data [5,28]. The Langmuir isotherm model, Equation (1), is the most widely used equation for modeling equilibrium data in solid-liquid adsorption systems.…”

Section: Adsorption Isothermsmentioning

confidence: 99%

“…Cadmium is extremely toxic and is classified as carcinogenic, impacting lungs, liver and kidney [1]. Researchers have developed methods to treat wastewater-containing heavy metal ions such as ion exchange [2], oil shale fly ash [3][4][5][6][7][8][9] membrane [10], coagulation [11], chemical precipitation [12], adsorption [13], including biosorption, that can remove heavy metals from very dilute aqueous contaminated solutions [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Treated oil shale ash and its capacity to remove Cd and Pb from aqueous solutions

Al-Ayed¹,

El-Hasan²,

Amro³

et al. 2022

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Cadmium (Cd) is the most highly toxic heavy metal even at a trace level. In this study, the oil shale ash treated material was used as an adsorbent to remove cadmium and lead (Pb) metals/ions from aqueous solutions. The absorbent treated oil shale material was characterized prior to experimental work using X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The effects of multiple factors on percent metal removal, including contact time, initial ions concentration and pH, are investigated. Results show that the adsorption capacities of Pb and Cd are 29.15 and 23.81 mgg -1 , whereas removal efficiencies are 56% and 48% in 10 minutes, respectively. Removal efficiency and time of equilibrium are affected by the metal atomic weight (Pb 207.2 u and Cd 112.4 u) and pH values. The equilibrium isotherms were analyzed using Freundlich and Langmuir isotherm models and described by the Freundlich isotherm model indicating a heterogeneous surface of the adsorbent. The calculated Langmuir adsorption constant and maximum adsorption capacity of adsorbent, K L and q max , are 1.313*10 -2 and 25.25, respectively. The Freundlich adsorption constant K F and the characteristic constant of the Freundlich isotherm n are 0.5234 and 1.39, respectively.

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“…Use of OSA-based adsorbents has also been extensively studied. An adsorbent made of OSA after alkali hydrothermal activation using sodium hydroxide had an adsorption capacity of 9 and 12 mg/g for the removal of lead and cadmium ions from aqueous solutions, respectively [10]. The maximum loading capacity of pesticides Deltamethrin and Lambda-Cyhalothrin from aqueous solutions by OSA was as high as 11.4 and 8.6 mg/g, respectively [11].…”

Section: Introductionmentioning

confidence: 99%

Removal of Methylene Blue From Aqueous Solution by Using Oil Shale Ash

Zhao¹,

Yuan²,

Fu³

et al. 2014

Oil Shale

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Oil shale ash (OSA) is a solid waste from the production process of shale oil. The large quantity of OSA generated in China yearly has led to serious, difficult-to-solve environmental problems. With a view to reducing OSA-induced environmental pressure, in this study, removal of methylene blue (MB) from aqueous solution by using OSA was investigated at different physical and chemical parameters, such as pH, temperature, initial MB concentration, and contact time. The experimental results showed that both the Langmuir and Freundlich models fitted the MB adsorption data well with an adsorption capacity as high as 250 mg/g. Removal of MB by OSA was relatively fast and equilibrium could be achieved in 2 h. Adsorption of MB by OSA was an endothermic reaction, and the change of free energy after MB adsorption indicated physical adsorption in nature. The results suggest a new potential utilization of OSA for the removal of color dye from wastewater.

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Adsorption of Lead and Cadmium Ions From Aqueous Solutions by Modified Oil Shale Ash

Cited by 12 publications

References 14 publications

Removal of Lead and Cadmium from Polluted Water Using Environmentally Safe Materials

Removal of Lead and Cadmium from Polluted Water Using Environmentally Safe Materials

Treated oil shale ash and its capacity to remove Cd and Pb from aqueous solutions

Removal of Methylene Blue From Aqueous Solution by Using Oil Shale Ash

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