Kinetics and Adsorption Studies of Mercury and Lead by Ceria Nanoparticles Entrapped in Tamarind Powder

Abstract

In this study, novel adsorbent ceria nanoparticles (CeNPs) entrapped in tamarind powder (Tm@CeNPs) were efficiently utilized for the simultaneous adsorption of aqueous mercury [Hg(II)] and aqueous lead [Pb(II)]. Surface interactions between the adsorbent and heavy metal ions play an important role in the adsorption process, and the surface morphology can significantly improve the adsorption capacity of the adsorbent. The Langmuir adsorption capacity of Tm@CeNPs for Hg(II) and Pb(II) was found to be 200 and 142.85 mg/g, respectively. The surface area of utilized adsorbent was found to be very high, that is, 412 m2/g. The adsorption kinetics of Tm@CeNPs for both ions follow pseudo-second-order, and the adsorption process is also thermodynamically feasible. Column study favors multilayer adsorption of the heavy metal ion. The spectral analysis of the adsorbent revealed that hydroxyl, carboxylic, and ester groups, as well as CeNPs, are responsible for Hg(II) and Pb(II) adsorption. The cost-benefit analysis confirms the economic viability of the synthesized Tm@CeNPs composite for heavy metal removal. The adsorbent is best suited for Hg(II) adsorption as compared to Pb(II). This is a novel study on the utilization of tamarind leaf powder with CeNPs for heavy metal ion adsorption and its adsorption mechanism, which has not been reported to date.

In Vitro Hepatotoxic and Neurotoxic Effects of Titanium and Cerium Dioxide Nanoparticles, Arsenic and Mercury Co-Exposure

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Simultaneous adsorption of heavy metals from aqueous matrices by nanocomposites: A first systematic review of the evidence

“…As HMs have long half-life and are non-biodegradable in the environment, they have been considered as toxic substances for the public health and environment even at ppb levels (4,6,7). These toxic metals affect cardiovascular systems, immune, digestive system, and the normal functioning of neurological via accumulation in the soft tissues and living organisms (8,9). In fact, some of them like Cu and Zn are proposed as carcinogens by the United States Environmental Protection Agency (USEPA) (7,10).…”

NASICON Electrodes for Sodium-Ion Batteries

“…Likewise, sodium ion surpasses Li-ion conductivities having very high conductivities and in the Na-super ionic electrode in the NASICON family. Previously, various metal oxide materials have been synthesized by using chemical precipitation, hydrothermal, and sol-gel method which has been used for the detoxification of water [20][21][22][23][24][25][26][27][28], but these nanomaterials were not utilized for the conduction of electricity. Hence, some other metal oxides have been synthesized and applied, such as NASICON based materials which were used as conductor materials.…”