scholarly journals Application of bimetallic Al-doped ZnO nano-assembly for heavy metal removal and decontamination of wastewater

2019 ◽  
Vol 80 (11) ◽  
pp. 2067-2078 ◽  
Author(s):  
Aquib Jawed ◽  
Lalit M. Pandey
Keyword(s):  
Heavy Metal ◽  
Colloidal Stability ◽  
Bimetallic Nanoparticles ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Physicochemical Process ◽  
Precipitation Method ◽  
Lead Removal ◽  
Wastewater Sample ◽  
X Ray

Abstract In the present study, bimetallic aluminium doped zinc oxide (AZO) nano-assemblies were synthesized for heavy metal removal and disinfection of wastewater. These bimetallic nanoparticles (NPs) were prepared by a simple co-precipitation method and characterized using field emission transmission electron microscopy (FETEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Brunauer–Emmett–Teller (BET), a Litesizer, and energy dispersive X-ray spectroscopy (EDS). The AZO NPs was tested for lead removal at various environmental conditions and optimized at pH 4 and 25 °C. The kinetic data were well fitted to the pseudo-second-order model and the process consisted of both surface adsorption and intraparticle diffusion. Al doping enhanced the surface charge of AZO NPs four fold as compared to ZnO, which improved colloidal stability and contributed towards its reusability. AZO NPs exhibited excellent removal efficiency of 86% over three adsorption-desorption cycles. The adsorption was found to be an exothermic and physicochemical process. The prepared AZO NPs were also used to treat a real wastewater sample and found to effectively remove Pb(II) and kill all the bacteria present.

scholarly journals Differentiating Nanomaghemite and Nanomagnetite and Discussing Their Importance in Arsenic and Lead Removal from Contaminated Effluents: A Critical Review

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2310
Author(s):  
Juan A. Ramos-Guivar ◽  
Diego A. Flores-Cano ◽  
Edson Caetano Passamani
Keyword(s):  
Heavy Metal ◽  
Iron Oxides ◽  
Photoelectron Spectroscopy ◽  
High Efficiency ◽  
Magnetic Circular Dichroism ◽  
Cost Evaluation ◽  
Precipitation Method ◽  
Lead Removal ◽  
X Ray ◽  
Co Precipitation

Arsenic and lead heavy metals are polluting agents still present in water bodies, including surface (lake, river) and underground waters; consequently, the development of new adsorbents is necessary to uptake these metals with high efficiency, quick and clean removal procedures. Magnetic nanoparticles, prepared with iron-oxides, are excellent candidates to achieve this goal due to their ecofriendly features, high catalytic response, specific surface area, and pulling magnetic response that favors an easy removal. In particular, nanomagnetite and maghemite are often found as the core and primary materials regarding magnetic nanoadsorbents. However, these phases show interesting distinct physical properties (especially in their surface magnetic properties) but are not often studied regarding correlations between the surface properties and adsorption applications, for instance. Thus, in this review, we summarize the main characteristics of the co-precipitation and thermal decomposition methods used to prepare the nano-iron-oxides, being the co-precipitation method most promising for scaling up processes. We specifically highlight the main differences between both nano-oxide species based on conventional techniques, such as X-ray diffraction, zero and in-field Mössbauer spectroscopy, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism, the latter two techniques performed with synchrotron light. Therefore, we classify the most recent magnetic nanoadsorbents found in the literature for arsenic and lead removal, discussing in detail their advantages and limitations based on various physicochemical parameters, such as temperature, competitive and coexisting ion effects, i.e., considering the simultaneous adsorption removal (heavy metal–heavy metal competition and heavy metal–organic removal), initial concentration, magnetic adsorbent dose, adsorption mechanism based on pH and zeta potential, and real water adsorption experiments. We also discuss the regeneration/recycling properties, after-adsorption physicochemical properties, and the cost evaluation of these magnetic nanoadsorbents, which are important issues, but less discussed in the literature.

scholarly journals Comparative Heavy Metal Removal Efficiencies of Biosurfactants Produced by Odoribacter Splanchnicus DSM 20712, Bacterium Clone JX981747 and Soil Washing Agents

2020 ◽  
Author(s):  
TOOCHUKWU Ekwutosi Ogbulie ◽  
Chioma Chimezie Okore ◽  
Agunna Everest Ejele
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Soil Washing ◽  
Acid Methyl Ester ◽  
Lead Removal ◽  
Test Soil ◽  
Gas Chromatography Mass Spectroscopy ◽  
Set Up ◽  
The One

Abstract The application of two biosurfactants in the removal of copper, zinc, and lead from waste metal dumpsite soil with their efficiencies was compared to soil washing agents as KNO3, Ca(NO3)2 and NaOH. The test soil samples were also spiked separately with different concentrations (50 mg/L, 250 mg/L, 750 mg/L and 1500 mg/L ) of CuSO4, ZnSO4 and Pb(NO3)2. The biosurfactants used were produced by Odoribacter splanchnicus DSM 20712 (WBS1) and an unidentified bacterium clone JX981747 (CMS). Five different treatment set up comprising of different ratios (20:1, 15:1, 10:1, 5:1, and 1:1) with the soil solution constant was respectively used. The heavy metal contents were measured using Atomic Absorption Spectrophotometer and the percentage heavy metal removal efficiency was calculated. The highest concentrations of biosurfactant (20:1) at different spiked concentrations of metallic salts recorded the highest values of copper (95.47%, 95.73%, 91.69%, 78.82%); zinc (97.98%, 98.98%, 97.29%, 96.78%) and lead (97.68%, 93.09%, 88.12%, 84.98%) removal. The percentage metal removed in each treatment increased with increasing concentration of the biosurfactants and washing agents (1:1 to 20:1). The chemical structure of the two biosurfactants analyzed using Gas Chromatography Mass Spectroscopy (GC-MS) depict the major component of biosurfactants produced from Odoribacter splanchnicus DSM 20712 to be Di-n- amyl phthalate while 9, Octadecanoic acid, methyl ester was from unidentified bacterium clone JX981747. The one dimensional paper chromatography showed presence of galactose/glucose, mannose, ribose, rhamnose in the biosurfactants produced from Odoribacter splanchnicus DSM 20712 whereas the unidentified bacterium clone JX981747 produced biosurfactants that contained all sugars except mannose. The test biosurfactants studied showed high levels of copper and lead removal than zinc when compared with the test soil washing agents (KNO3), Ca(NO3)2 and NaOH used in this study. Biosurfactants have thus shown to have the ability to remove metals hence its use requires scaling up for environmental applications.

Hydroxyapatite-Based Materials for Heavy Metal Removal in Wastewater Treatment

2020 ◽  
Vol 4 (2) ◽  
pp. 1-5
Author(s):  
Al Bazedi GA
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Cost Effective ◽  
Precipitation Method ◽  
Efficient Removal ◽  
Hydroxyapatite Powder ◽  
Removal Of Heavy Metals ◽  
Treatment Technologies

Nowadays, undisputable environmental pollution requests endeavors to treat wastewater, particularly containing heavy metal, where wastewater treatment technologies are improving hastily. Hydroxyapatite with micro-porous structure and the large surface area turns into an intense research topic as of its high adsorption capacity. Environmentally friendly Hydroxyapatite powder with the large specific surface is a promising cost-effective precipitation method, for the removal of heavy metals (Al, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Zn) from wastewater. Different studies have revealed the efficient removal of all metals using hydroxyapatite or by modified HA using zeolite or chitosan. The increase of Ca2+ ions content in the treated water suggests an ion exchange mechanism

scholarly journals Removal of Zn(II), Mn(II) and Cu(II) by adsorption onto banana stalk biochar: adsorption process and mechanisms

2020 ◽  
Vol 82 (12) ◽  
pp. 2962-2974
Author(s):  
Hua Deng ◽  
Qiuyan Li ◽  
Meijia Huang ◽  
Anyu Li ◽  
Junyu Zhang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Photoelectron Spectroscopy ◽  
Heavy Metal Ions ◽  
Metal Removal ◽  
Low Cost ◽  
Heavy Metal Removal ◽  
Order Kinetic ◽  
Solution Ph ◽  
X Ray

Abstract Low-cost banana stalk (Musa nana Lour.) biochar was prepared using oxygen-limited pyrolysis (at 500 °C and used), to remove heavy metal ions (including Zn(II), Mn(II) and Cu(II)) from aqueous solution. Adsorption experiments showed that the initial solution pH affected the ability of the biochar to adsorb heavy metal ions in single- and polymetal systems. Compared to Mn(II) and Zn(II), the biochar exhibited highly selective Cu(II) adsorption. The adsorption kinetics of all three metal ions followed the pseudo-second-order kinetic equation. The isotherm data demonstrated the Langmuir model fit for Zn(II), Mn(II) and Cu(II). The results showed that the chemical adsorption of single molecules was the main heavy metal removal mechanism. The maximum adsorption capacities (mg·g−1) were ranked as Cu(II) (134.88) > Mn(II) (109.10) > Zn(II) (108.10)) by the single-metal adsorption isotherms at 298 K. Moreover, characterization analysis was performed using Fourier transform infrared spectroscopy, the Brunauer-Emmett-Teller method, scanning electron microscopy with energy-dispersive X-ray spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The results revealed that ion exchange was likely crucial in Mn(II) and Zn(II) removal, while C-O, O-H and C = O possibly were key to Cu(II) removal by complexing or other reactions.

Fabrication of 2 wt% NiFe2O4/HAp Composite Ceramic for Future Heavy Metal Removal Applications

2015 ◽  
Vol 804 ◽  
pp. 291-294
Author(s):  
Pattarinee Klumdoung ◽  
Salakchit Pukjaroon ◽  
Piyapong Pankaew
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Composite Ceramic ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Reaction Method ◽  
X Ray ◽  
Ft Ir ◽  
Scanning Electron

In this study, 2 wt% NiFe2O4/HAp composite ceramic was fabricated by the solid state reaction method to form a composite with the future potentiality to remove heavy metals. HAp powders were synthesized by precipitation using Ca (NO3)2 as Ca source, (NH4)2HPO4 as the P source and ammonia as a pH adjuster. NiFe2O4 powders were prepared by mixing and milling NiO and Fe2O3 powders (using stoichiometry ratio) in ethanol and sequent dehydration and then calcination. 2 wt% of NiFe2O4 powders were milled with 98 wt% of HAp powders for 10 minutes before uniaxial pressing and sintering at 1200 °C for 3 hours to form 2 wt% NiFe2O4/HAp composite ceramic. The prepared ceramic was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM). XRD result shown that 2 wt% NiFe2O4/HAp composite ceramic with only HAp and NiFe2O4 phases obtained. FT-IR results revealed vibration bands of standard HAp and indicated the interaction between ZnFe2O4 and HAp. For the SEM result, the morphology of the prepared ceramic revealed nanoand micro sized grains. These results could lead us to the development of a method for a NiFe2O4/HAp composite ceramic optimized for specific heavy metal removal applications.

Characterization of Philippine Natural Zeolite and its Application for Heavy Metal Removal from Acid Mine Drainage (AMD)

2017 ◽  
Vol 737 ◽  
pp. 407-411 ◽  
Author(s):  
Eleanor Olegario-Sanchez ◽  
Christian Mark Pelicano
Keyword(s):  
Heavy Metal ◽  
Acid Mine Drainage ◽  
Natural Zeolite ◽  
Mine Drainage ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Metal Species ◽  
X Ray Diffraction ◽  
X Ray ◽  
Acid Mine

In this study, the adsorption efficiency of Philippine natural zeolite for treating acid mine drainage is investigated. The metal ions considered were Cu2+, Ni2+, and Pb2+ ions. The natural zeolite was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with Energy Dispersive X-ray Spectroscopy (EDX). The XRD result revealed that the natural zeolite is mainly composed of heulandite (Ca,Na)2-3Al3(Al,Si)2Si13O36 • 12H2O. Plate-like structures having rough surface and micro-pores were observed. The natural zeolite exhibited adsorption efficiencies of 99.03%, 35.88% and 35.36% for Pb2+, Cu2+, and Ni2+ ions, respectively, which are higher than those of alumina adsorbent for the same ions. Based on these results, the Philippine natural zeolite has a great potential for removing cationic heavy metal species from acid mine drainage (AMD).

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