Removal of hazardous heavy metals from aqueous environment by low-cost adsorption materials

Keng, Pei Sin; Lee, Siew Ling; Ha, Sie‐Tiong; Hung, Yung Tse; Ong, Siew Teng

doi:10.1007/s10311-013-0427-1

Cited by 103 publications

(24 citation statements)

References 90 publications

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“…For a long time, adsorption has been considered an effective method for pollution control (Reddad et al 2002;Bradl 2004). Adsorption techniques have significant advantages, such as profitability, availability, low cost (for example, the price of adsorption by vermiculite is only 20% of osmotic membrane technology), high efficiency (for example, the adsorption efficiency of kyanite for Cu(II) can reach 100%), and ease of operation in comparison with other techniques (Ajmal et al 2001;Keng et al 2014). Moreover, it offers simple operation and high efficiency (the maximum efficiency can reach 100%) in the removal of toxic heavy metals, even at trace levels (Musyoka et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Clay mineral adsorbents for heavy metal removal from wastewater: a review

et al. 2018

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Heavy metal pollution such as water contamination by Pb, Hg, Cu, Cd and Cr ions is induced by rapid urbanization and industrialization and is a major threat to human health. One of the most efficient processes to clean contaminated water is adsorption. Adsorbents such as clay minerals and modified clays are efficient for the removal of metal ions from wastewater. This manuscript reviews current research in heavy metal adsorption by clay minerals such as halloysite, bentonite, montmorillonite, vermiculite and attapulgite, from 2013 to 2017, and highlights the main adsorption mechanisms. The structure, composition and synthesis of various clay minerals and modified clays are presented.

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Section: Introductionmentioning

confidence: 99%

Clay mineral adsorbents for heavy metal removal from wastewater: a review

et al. 2018

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“…Various conventional physiochemical processes are used for the removal of heavy metals from wastewater such as coagulation, flocculation [20], precipitation [21], adsorption [22], membrane filtration [23], electrolysis [24], photocatalytic degradation [25], ion exchange [26], oxidation, reduction [27] and solvent extraction [28]. Different researchers have indicated the strength and limitation of these techniques [1,[29][30][31]. Among these, adsorption method does not require a huge input of chemical reagents that create other environmental and health problems to deal with secondary pollutants.…”

Section: Introductionmentioning

confidence: 99%

Removal of cadmium (Cd-II) from aqueous solution using gas industry-based adsorbent

Kumar

2019

SN Appl. Sci.

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The present study is to determine the potential of gas industry sludge as a low-cost adsorbent for the removal of cadmium from aqueous solution. The batch experiments were conducted to optimize pH, contact time, adsorbent dose and initial metal ion concentration. The experiments were optimized at pH 5, contact time 60 min and an adsorbent dose of 0.75 g/100 ml with constant agitation at the room temperature. The result of batch experiment was further discussed for the removal of cadmium from adsorbent. The adsorption data were correlated with Freundlich and Langmuir isotherms to know the interaction of sludge adsorbent with cadmium. High value of regression coefficient (R 2 > 0.95) indicated that the adsorption data are fitted well with both Langmuir and Freundlich isotherms. The adsorption capacity of 25 mg/g was found to be quite good for removal of the cadmium from aqueous solution. Desorption efficiency showed highest removal with HCl (42.83%); followed by HNO 3 (38.26%), EDTA (37.73%) and H 2 SO 4 (36.83%). The removal and desorption efficiency of the gas industry-based adsorbent was found to be comparable and even more suitable than the chemically modified adsorbents. The present study provides a low-cost and environmentally friendly adsorbent, which can be used as an alternative for the treatment of wastewater.

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“…The ingestion of copper, zinc, cadmium, lead, mercury, iron and nickel in amounts exceeding guidelines damages severely human physiology [3]. Several treatment techniques for heavy metals removal from wastewater have been reported in literature [4]. Chemical precipitation, ion exchange and adsorption are among these methods are.…”

Section: Introductionmentioning

confidence: 99%