Immobilization of Salicylic Acid on Ni-Zn Layered Hydroxide Salts

Ni-Zn Layered hydroxide salt (Ni-Zn LHS) has been synthesized from equimolar Ni(NO3)2 and Zn(NO3)2 by co-precipitation method using NaOH. The formation of layered assembly is confirmed in X-ray diffractogram, i.e. by the appearance of peaks at 2θ: 9.60°, 19.40°, 33.48°, and 59.76° which corresponds to diffraction plane (001), (003), (020), and (040), respectively. The synthesized Ni-Zn LHSs possessed the point of zero charge (pHpzc) at pH 8 and nitrate as the interlamellar ion. The incorporation of salicylic acid into LHS can extend the property of LHS as a reductive adsorbent in the application of metal recovery. The immobilization of salicylic acid on the Ni-Zn-LHS was successfully done and indicated the strong pH-dependent property. The immobilization of salicylic acid on Ni-Zn LHSs was optimum at pH 7 and followed better the Langmuir than Freundlich isotherm models with immobilization capacity 64.93 mg/g. After the immobilization of salicylic acid, the basal spacing of Ni-Zn LHSs did not enlarge indicating that the immobilized salicylic acid was on the outer layer without entering the interlayer and this immobilized salicylic acid was stable at medium pH range 3 to 9.

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Synthesis of Magnetic Modified Organobentonite as Adsorbent for Degradation of Orange II

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.838-841.2306 ◽

2013 ◽

Vol 838-841 ◽

pp. 2306-2309

Author(s):

Guang Hua Wang ◽

Kun Chen ◽

Wen Bing Li ◽

Dong Wan ◽

Qin Hu ◽

...

Keyword(s):

Magnetic Field ◽

Reaction Medium ◽

Precipitation Method ◽

Basal Spacing ◽

Orange Ii ◽

X Ray Diffraction ◽

X Ray ◽

Ft Ir ◽

Co Precipitation ◽

Scanning Electron

Magnetic modified organobentonite (Fe3O4/CTAB–Bent) was synthesized by chemical co-precipitation method in which CTAB–Bent was firstly achieved via ion–exchange.The composite materials have been characterized by powder X–ray diffraction (XRD), Fourier transform infrared spectroscopy (FT–IR) and Scanning electron microscopy (SEM) . The results revealed that basal spacing of bentonite was increased through organic modification and the Fe3O4 particles synthesized which covering the surfaces of bentonite .Compared with natural bentonite, the adsorption capacity of Fe3O4/CTAB–Bent for Orange II was greatly enhanced and can be easily separated from the reaction medium by an external magnetic field after the treatment.

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Novel nanostructured Fe–Cu–Al trimetal oxide for enhanced antimony(V) removal: synthesis, characterization and performance

Water Science & Technology ◽

10.2166/wst.2019.198 ◽

2019 ◽

Vol 79 (10) ◽

pp. 1995-2004

Author(s):

Jianyan Wang ◽

Jing Chen ◽

Qiumei Li ◽

Gaosheng Zhang

Keyword(s):

Toxic Metal ◽

Point Of Zero Charge ◽

Precipitation Method ◽

Hydroxyl Groups ◽

Adverse Health Effects ◽

Ion Exchange Reaction ◽

Wide Ph Range ◽

And Performance ◽

Ph Range ◽

Co Precipitation

Abstract Given the adverse health effects of antimony (Sb), there is an increased focus on developing methods to remove this toxic metal from contaminated water bodies. To effectively remove Sb(V), a new nanostructured Fe–Cu–Al trimetal oxide was fabricated using co-precipitation method at ambient temperature. The Fe–Cu–Al trimetal oxide was very effective at removing Sb(V) from water; it had a maximal adsorption capacity of 169.1 mg/g at pH 7.0, a capacity that was competitive with most other reported adsorbents. The obtained amorphous oxide had a high pH point of zero charge (pHpzc = 8.8) and good adsorption Sb(V) efficiency over a wide pH range (4.0–8.0). Sb(V) uptake was achieved mainly through an ion-exchange reaction between Sb(V) ions and hydroxyl groups on the surface of the oxide. Given its good removal performance, high selectivity, and simple synthesis, this novel Fe–Cu–Al trimetal oxide offers a promising alternate for removing antimony contamination from aquatic environments.

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Facile Synthesis of g-C3N4/MoO3 Nanohybrid for Efficient Removal of Aqueous Diclofenac Sodium

Nanomaterials ◽

10.3390/nano11061564 ◽

2021 ◽

Vol 11 (6) ◽

pp. 1564

Author(s):

Jamshaid Rashid ◽

Faryal Saleemi ◽

Bilal Akram ◽

Lin Wang ◽

Naveed Hussain ◽

...

Keyword(s):

Adsorption Capacity ◽

Molybdenum Trioxide ◽

Diclofenac Sodium ◽

Freundlich Isotherm ◽

Precipitation Method ◽

Isotherm Models ◽

Aromatic Rings ◽

Facile Fabrication ◽

Co Precipitation ◽

First Time

Graphitic carbon nitride modified by molybdenum trioxide (g-C3N4/MoO3) as a nanohybrid was synthesized by co-precipitation method. Here, g-C3N4/MoO3 nanohybrid was used for the first time as an adsorbent for the pharmaceutical drug, diclofenac, (an aqueous micropollutant) from water to mitigate its possible environmental toxic effects. Compared to pristine components, the nanohybrid exhibited better adsorptive removal of diclofenac. Adsorption was enhanced with increment in MoO3 content from 1 to 3 wt %; however further increment in MoO3 content resulted in lower adsorption capacity due to agglomeration of MoO3 particles over g-C3N4. 162 mg g−1 adsorption capacity was achieved for 300 mg L−1 diclofenac in solution with 1 g L−1 adsorbent at pH = 6. Adsorption of diclofenac over g-C3N4 /MoO3 followed pseudo 2nd order kinetics. Temkin, Langmuir, Dubinin Radushkevich and Freundlich isotherm models were applied on the experimental results concluding that diclofenac adsorption over g-C3N4/MoO3 followed the Langmuir isotherm. The adsorption mechanism could be explained by the π–π interaction between aromatic rings of diclofenac and g-C3N4/MoO3 (3%) nanohybrid, which is also evident by the FTIR results. This study presents the facile fabrication of a 2nd generation adsorbent for the treatment of diclofenac contaminated water that may as well help achieve the removal of other micropollutants form water.

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Preparation and sorption property study of Fe3O4/Al2O3/ZrO2 composite for the removal of cadmium, lead and chromium ions from aqueous solutions

Bulletin of the Chemical Society of Ethiopia ◽

10.4314/bcse.v34i1.10 ◽

2020 ◽

Vol 34 (1) ◽

pp. 105-121

Author(s):

Fekadu Tsegaye ◽

Abi M. Taddesse ◽

Endale Teju ◽

Minbale Aschalew

Keyword(s):

Aqueous Solutions ◽

Mixed Oxides ◽

Sorption Property ◽

Freundlich Isotherm ◽

Experimental Results ◽

Point Of Zero Charge ◽

Precipitation Method ◽

Order Kinetic ◽

X Ray Diffraction ◽

X Ray

Fe-Al-Zr ternary mixed oxides composite was synthesized via co-precipitation method for the removal Pb(II), Cd(II) and Cr(VI) ions from aqueous solutions. The as-synthesized materials were characterized by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscope hyphenated with energy dispersive X-ray diffraction (SEM-EDX) and Fourier transform infrared (FTIR) techniques. The pH at the point of zero charge (pHpzc) of the sorbent and effect of ionic strength on sorption were also determined. The batch tests were conducted to optimize the various sorption parameters such as pH, adsorbent dose, contact time, speed of agitation and initial metal concentration. The experimental results showed that the adsorbed amounts of Pb(II), Cd(II) and Cr(VI) tend to decrease with increase in pH. Freundlich isotherm model fits better the equilibrium data for the adsorbent. Kinetic data correlated better with both pseudo first order and pseudo second order kinetic models. The spontaneous nature of the adsorption process was also confirmed from thermodynamic grounds. The nanosized adsorbent exhibited an adsorption efficiency of 96.65%, 96.55% and 97.2% for Cd(II), Cr(VI) and Pb(II), respectively, at optimum condition. Experimental results showed that the nanocomposite was effective for the removal of the title heavy metals from aqueous solution. Bull. Chem. Soc. Ethiop. 2020, 34(1), 105-121. DOI: https://dx.doi.org/10.4314/bcse.v34i1.10

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Adsorption of UO2 2+ by AlBaNi-layered double hydroxide nano-particles: kinetic, isothermal, and thermodynamic studies

Radiochimica Acta ◽

10.1515/ract-2021-1113 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Olivea Abd Al-Azim Elhefnawy ◽

Amira Abd ElFattah Elabd

Keyword(s):

Electron Microscope ◽

Nano Particles ◽

Precipitation Method ◽

Isotherm Models ◽

X Ray ◽

Atomic Force ◽

Transmission Electron ◽

Pseudo Second Order ◽

Co Precipitation ◽

Double Hydroxide

Abstract AlBaNi-LDH nanoparticles have been synthesized by the co-precipitation method. A series of characterization analyses (Scanning Electron Microscope, Energy Dispersive X-ray, Transmission Electron Microscope, X-ray Diffraction, Atomic Force Microscope, and Infrared spectroscopy) proved that the surface structure of AlBaNi-LDH nano-particles was the key mechanism for UO2 2+ adsorption. The synthesized product showed good performance in UO2 2+ adsorption efficiency in neutral pH with a maximal adsorption capacity of 137 mg/g. The results demonstrated the adsorption process fitted well with pseudo-second-order and Langmuir isotherm models. Also, the effects of coexisting ions and different eluents are briefly described. These results confirm that AlBaNi-LDH is an effective material for the adsorption of UO2 2+ from an aqueous solution with reusable availability.

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Synthesis and Application of Layered Double Hydroxide for the removal of Copper in Wastewater

International Journal of Chemistry ◽

10.5539/ijc.v7n1p122 ◽

2015 ◽

Vol 7 (1) ◽

pp. 122 ◽

Cited By ~ 9

Author(s):

Ayawei N. ◽

Ekubo A. T. ◽

Wankasi D. ◽

Dikio E. D.

Keyword(s):

Layered Double Hydroxide ◽

Freundlich Isotherm ◽

Isosteric Heat ◽

Entropy Change ◽

Precipitation Method ◽

Isotherm Models ◽

X Ray Diffraction ◽

Phase Contact Time ◽

Co Precipitation ◽

Double Hydroxide

Ni-Al Layered double hydroxide (Ni-Al LDHs) with M2+: M3+ (4:1) ratio was synthesized by co-precipitation method from nitrate salt solutions. The layered double hydroxide was characterized by Fourier transform infrared spectroscopy, X-Ray Diffraction, Energy Dispersive Spectroscopy/Scanning Electronic Microscopy. The influences of phase contact time, temperature and initial concentrations were investigated to optimize the conditions for maximum adsorption. The experimental data were analyzed by Langmuir and Freundlich isotherm models and fitted well with correlation coefficient values of 0.9996 and 0.9995 respectively. The thermodynamic parameters of Isosteric heat of adsorption (DHx), Activation energy (Ea), Enthalpy change (DHo) and Entropy change (DSo) were calculated to be 18.1KJ/mol, 1.447KJ/mol, -7.135J/mol and 24J/molK respectively. The results shows that the adsorption process was spontaneous and exothermic.

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Photoluminescent Properties of Hydroxyapatite and Hydroxyapatite/Multi-Walled Carbon Nanotube Composites

Crystals ◽

10.3390/cryst11070832 ◽

2021 ◽

Vol 11 (7) ◽

pp. 832

Author(s):

Edna X. Figueroa-Rosales ◽

Javier Martínez-Juárez ◽

Esmeralda García-Díaz ◽

Daniel Hernández-Cruz ◽

Sergio A. Sabinas-Hernández ◽

...

Keyword(s):

Carbon Nanotube ◽

Hexagonal Phase ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Multi Walled Carbon Nanotube ◽

Nanotube Composites ◽

Carbon Nanotube Composites ◽

Co Precipitation ◽

Functionalized Mwcnts

Hydroxyapatite (HAp) and hydroxyapatite/multi-walled carbon nanotube (MWCNT) composites were obtained by the co-precipitation method, followed by ultrasound-assisted and microwave radiation and thermal treatment at 250 °C. X-ray diffraction (XRD) confirmed the presence of a hexagonal phase in all the samples, while Fourier-transform infrared (FTIR) spectroscopy elucidated the interaction between HAp and MWCNTs. The photoluminescent technique revealed that HAp and the composite with non-functionalized MWCNTs present a blue luminescence, while the composite with functionalized MWCNTs, under UV-vis radiation shows an intense white emission. These findings allowed presentation of a proposal for the use of HAp and HAp with functionalized MWCNTs as potential materials for optoelectronic and medical applications.

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Evaluation of Fe-Mg Binary Oxide for As (III) Adsorption—Synthesis, Characterization and Kinetic Modelling

Nanomaterials ◽

10.3390/nano11030805 ◽

2021 ◽

Vol 11 (3) ◽

pp. 805

Author(s):

Saif Ullah Khan ◽

Rumman Zaidi ◽

Feroz Shaik ◽

Izharul Haq Farooqi ◽

Ameer Azam ◽

...

Keyword(s):

Arsenic Removal ◽

Kinetic Modelling ◽

Arsenic Concentration ◽

Experimental Studies ◽

Precipitation Method ◽

Arsenic Adsorption ◽

Adsorbent Dosage ◽

X Ray ◽

Co Precipitation ◽

Contaminated Waters

Nanotechnology has received much attention in treating contaminated waters. In the present study, a facile co-precipitation method was employed to synthesize a novel iron and magnesium based binary metal oxide using a stoichiometrically fixed amount of FeNO3.9H2O and MgNO3.6H2O in a proportion of molar concentration 1:1 and was later evaluated in removing As (III) from contaminated waters. Characterization of the prepared nanomaterial was done using X-ray diffraction (XRD), scanning electron microscopy (SEM), Energy Dispersive X-Ray Analysis (EDAX) and ultraviolet–visible spectrophotometry (UV-VIS). Experimental studies on batch scale were carried out, examining the effect of varying initial concentrations of metal, adsorbent dosage, application time and initial pH on removal efficiency. Arsenic removal increased on increasing adsorbent dosage (0.1–1 g/L) but trend reversed on increasing initial arsenic concentration attaining qmax of 263.20 mg/g. Adsorption was quite efficient in pH range 4–8. Freundlich fitted better for adsorption isotherm along with following Pseudo-2nd order kinetics. The reusability and effect of co-existing ions on arsenic adsorption, namely SO42−, CO32− and PO43− were also explored with reusability in 1st and 2nd cycles attained adsorptive removal up to 77% and 64% respectively. The prepared nano-adsorbent showed promising results in terms of high arsenic uptake (qmax of 263.20 mg/g) along with facile and cost-effective synthesis. Thus, the co-precipitation technique used in this work is a simple one step procedure without any use of any precursor as compared to most of the other procedures used for synthesis.

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Photocatalytic Activity of Fe-Doped ZnO/Montmorillonite Nanocomposite for Degradation of Malachite Green

Materials Science Forum ◽

10.4028/www.scientific.net/msf.827.19 ◽

2015 ◽

Vol 827 ◽

pp. 19-24 ◽

Cited By ~ 4

Author(s):

Nur Afifah ◽

Nadia Febiana Djaja ◽

Rosari Saleh

Keyword(s):

Photocatalytic Activity ◽

Malachite Green ◽

Organic Dyes ◽

Uv Light ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Spin Resonance ◽

Doped Zno ◽

Co Precipitation

In this study, the photocatalytic activity of pure Fe- doped ZnO and Fe- doped ZnO/Montmorillonite nanocomposite has been investigated for the degradation of malachite green under UV light irradiation. Both photocatalysts were synthesized using co-precipitation method and characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, Fourier-transform infrared absorption, and electron spin resonance. The results showed that the photocatalytic efficiency is better in the presence of montmorillonite compared to pure Fe- doped ZnO. To detect the possible reactive species involved in degradation of organic dyes control experiments with introducing scavengers into the solution of organic dyes were carried out. It is found that electron plays an important role in the degradation of malachite green.

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