Environmentally Friendly and Cheap Removal of Lead (II) and Zinc (II) from Wastewater with Fish Scales Waste Remains

In this article, the physical and chemical properties of pulverized, vinegar treated waste from fish scale remains of fish from Lake Ngami in Sehitwa near Maun, Botswana, were investigated for a possibility of being employed as an environmentally friendly and cheap sorbent material for reducing or removing excess, toxic, heavy metal ions from wastewater before different uses. Lead (II) and Zinc (II) ions were selected as model ions to demonstrate the potential of fish scale waste remains in removing excess toxic heavy metal ions. The pulverized size of the waste was found to be 60 µm, with round and smooth morphology, which are excellent characteristics usually associated with superior sorbents. Furthermore, the fourier transform infrared spectrometer spectrum showed multiple functional groups such as amines, carboxylic, hydroxyl, and carbonyls which are well known to bond well with metals through hydrogen and oxygen bonding. The X-ray diffractogram of the fish scales showed the presence of hydroxyapatite, which has an excellent ion-exchange performance, which exchanges calcium ion site with metals. Multivariate methodologies statistical software, Minitab, were employed for the simultaneous optimization factors that affect sorption studies; initial ions concentration which was found to be 24.45 mg/L, the sorbents dose which was found to be 76.99 mg/L, contact time, which were found to be 62.37 min and solution pH 7.52. The fish scales waste also exhibited high percentage removal efficiencies toward Lead (II) and Zinc (II) removal from real wastewater samples at 81.97% and 80.37% with percentage relative standard deviation of 1.34% and 1.02% respectively.

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Efficient Removal of Cu 2+ with Environmentally Friendly Cellulosic Resin

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.356-360.1315 ◽

2011 ◽

Vol 356-360 ◽

pp. 1315-1318 ◽

Cited By ~ 2

Author(s):

Bao Xiu Zhao ◽

Yuan Wei ◽

Li Na Zheng ◽

Jie Shu ◽

Fan Yang

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Heavy Metal Ions ◽

Environmentally Friendly ◽

Efficient Removal ◽

Solution Ph ◽

Isothermal Model ◽

Langmuir Adsorption ◽

Adsorption Resin ◽

Adsorption Capability

Because of the environmental danger of heavy metal ions, how to safely and efficiently remove them has became a research hot point. Compared with common methods, adsorption is a better treatment for heavy metal ions. In this paper, Cu 2+ was removed from aqueous solution by a kind of environmentally friendly cellulosic adsorption resin and adsorption performance was investigated. The effects of factors, such as adsorbent dosage and solution pH, on adsorption were investigated. Experimental results displayed that adsorption performed well in neutral solution, and removal was about 94% when used dosage of resin was 0.6 g/L and initial concentration of Cu 2+ was 25 mg/L. Cellulosic resin owned powerful adsorption capability for other heavy metal ions, also. Adsorption behavior abided by Langmuir adsorption isothermal model, and maximum adsorption capability and equilibrium constant was 71.43 mg/g and 1.22 L/g, respectively. Resin could be regenerated by 8% ammonia and regeneration ratio was 74% after 2.5 h.

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Hybrid capacitive deionization of NaCl and toxic heavy metal ions using faradic electrodes of silver nanospheres decorated pomegranate peel-derived activated carbon

Environmental Research ◽

10.1016/j.envres.2021.111110 ◽

2021 ◽

Vol 197 ◽

pp. 111110

Author(s):

G. Bharath ◽

Abdul Hai ◽

K. Rambabu ◽

Faheem Ahmed ◽

Ahmed S. Haidyrah ◽

...

Keyword(s):

Heavy Metal ◽

Activated Carbon ◽

Metal Ions ◽

Heavy Metal Ions ◽

Capacitive Deionization ◽

Pomegranate Peel ◽

Toxic Heavy Metal ◽

Silver Nanospheres

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A Short Review on Recent Advances of Hydrogel-Based Adsorbents for Heavy Metal Ions

Metals ◽

10.3390/met11060864 ◽

2021 ◽

Vol 11 (6) ◽

pp. 864

Author(s):

Suguna Perumal ◽

Raji Atchudan ◽

Thomas Nesakumar Jebakumar Immanuel Edison ◽

Rajendran Suresh Babu ◽

Petchimuthu Karpagavinayagam ◽

...

Keyword(s):

Heavy Metal ◽

Metal Ions ◽

Heavy Metal Ions ◽

Large Scale ◽

Water Bodies ◽

Dimensional Structure ◽

High Porosity ◽

Adsorption Method ◽

Toxic Heavy Metal ◽

Practical Applications

The growth of industry fulfills our necessity and promotes economic development. However, pollutants from such industries pollute water bodies which pose a high risk for living organisms. Thus, researchers have been urged to develop an efficient method to remove toxic heavy metal ions from water bodies. The adsorption method shows promising results for the removal of heavy metal ions and is easy to operate on a large scale, thus can be applied to practical applications. Numerous adsorbents were developed and reported, among them hydrogels, which attract great attention because of the reusability, ease of preparation, and handling. Hydrogels are generally prepared by the cross-linking of polymers that result in a three-dimensional structure, showing high porosity and high functionality. They are hydrophilic in nature because of the functional groups, and are non-toxic. Thus, this review provides various methods of hydrogel adsorbents preparation and summarizes recent progress in the use of hydrogel adsorbents for the removal of heavy metal ions. Further, the mechanism involved in the removal of heavy metal ions is briefly discussed. The most recent studies about the adsorption method for the treatment of heavy metal ions contaminated water are presented.

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