Arsenate Removal from Water by Simultaneous Green Tea Nano-Zerovalent Iron and Ultrasonic Wave

Nano-zerovalent iron (NZVI) was synthesized using green tea (GT) extract and it was used as an adsorbent in arsenate removal from water. FESEM, PSD, and XRD employed in the examination of particles and their characterizations. Results showed that the particles were spherical lumped together in a texture structure with sizes ranging from 20 to 70 nanometers. All experiments were accomplished in a batch mode. Adsorption isotherm, adsorption kinetics, and the effects of pH, GT-NZVI dosage, and ultrasonic wave power on arsenate separation capabilities were explored. The results suggested that the arsenate removal efficiency enhanced with increasing GT-NZVI dosage. Increase in pH from 3 to approximately 6 leads to increase in the removal efficiency; however, increasing the pH further decreased the removal efficiency. The effect of ultrasonic power on As(V) removal was dependent on pH and NZVI dosages. The positive effect was more pronounced at low adsorbent dosages and acidic solution in which the As(V) removal efficiency improved with increasing ultrasonic power. However, in highly alkali solutions As(V) removal efficiency reduced with increasing ultrasonic power. The adsorption kinetics followed second order, while the adsorption isotherm was fitted best with Langmuir equation at a maximum capacity of 34.2 mg g−1.

Download Full-text

The reduction of chromite ore processing residues by green tea synthesized nano zerovalent iron and its solidification/stabilization in composite geopolymer

Journal of Cleaner Production ◽

10.1016/j.jclepro.2019.06.004 ◽

2019 ◽

Vol 234 ◽

pp. 381-391 ◽

Cited By ~ 5

Author(s):

Faheem Muhammad ◽

Ming Xia ◽

Shan Li ◽

Xu Yu ◽

Yanhong Mao ◽

...

Keyword(s):

Green Tea ◽

Zerovalent Iron ◽

Chromite Ore ◽

Ore Processing ◽

Nano Zerovalent Iron

Download Full-text

The Adsorption on Nano-Fe3O4 of Malachite Green from Aqueous Solution

Nano LIFE ◽

10.1142/s1793984415420052 ◽

2015 ◽

Vol 05 (03) ◽

pp. 1542005 ◽

Cited By ~ 1

Author(s):

Lu Fan ◽

Ling Li ◽

Keke Sun ◽

Lebao Mao ◽

Keke Liang ◽

...

Keyword(s):

Experimental Data ◽

Aqueous Solution ◽

Adsorption Isotherm ◽

Malachite Green ◽

Adsorption Kinetics ◽

Langmuir Isotherm ◽

High Adsorption ◽

Isotherm Adsorption ◽

High Adsorption Capacity ◽

Nano Fe3o4

The adsorption of malachite green from an aqueous solution of magnetic Fe 3 O 4 was studied in view of the adsorption isotherm, kinetics and regeneration of the sorbent. The adsorption isotherm of MG on nano- Fe 3 O 4 composite followed the Langmuir isotherm. Adsorption kinetics was determined from the experimental data. The nano- Fe 3 O 4 can be recycled for reuse after regeneration through acetonitrile. The high adsorption capacity and excellent reusability made Fe 3 O 4 attractive for the removal of MG from aqueous solution.

Download Full-text

A twilight for the complete nitrogen removal via synergistic partial-denitrification, anammox, and DNRA process

npj Clean Water ◽

10.1038/s41545-021-00122-5 ◽

2021 ◽

Vol 4 (1) ◽

Author(s):

Hafiz Adeel Ahmad ◽

Beibei Guo ◽

Xuming Zhuang ◽

Yiyi Zhao ◽

Shakeel Ahmad ◽

...

Keyword(s):

Magnetic Field ◽

Removal Efficiency ◽

Nitrogen Removal ◽

Gene Copy Number ◽

Nitrogen Loading ◽

Zerovalent Iron ◽

Gene Copy ◽

High Throughput Analysis ◽

Start Up ◽

Nano Zerovalent Iron

AbstractThe prolonged start-up time and low total nitrogen removal of anammox hinder its full-scale application. Herein, application of nano-zerovalent iron and low strength magnetic field in sole and in combination to abbreviate the start-up period and long-term process stability of anammox was carried out. The reactor’s anammox start-up with the only magnetic field (R3) was 34 days, saving 43.3% time compared with the control. The increase of nitrogen removal efficiency over the control was 43.7% during the start-up period. However, the reactor with the coupled treatment of nano-zerovalent iron and magnetic field (R4) was more stable with higher nitrogen removal efficiency (80%) at high nitrogen loading (5.28 kg/m3/d). Anammox gene copy number in R4 was highest after 180 days of culture, followed by nano-zerovalent iron (R2) and R3 reactor. The functional genes of denitrifying bacteria (nirK and nirS) were also identified in all reactors with higher copy numbers in R2, followed by R4 and R3. Furthermore, high throughput analysis showed that the Thauera performing partial denitrification, Ignavibacterium performing dissimilatory nitrate reduction to ammonium or nitrite were also present in all reactors, more abundant in R4, confirming that the higher nitrogen removal efficiency in R4 was attributed to the synergistic relationship of other nitrogenous genera with anammox. The higher abundance of PD and DNRA in the reactor with the coupled treatment of nano-zero valent iron and magnetic field, achieved in this research, opens the opportunity of complete nitrogen removal via synergistic partial-denitrification, anammox, and DNRA (SPDAD) process.

Download Full-text

Removal of hexavalent chromium from wastewater by Cu/Fe bimetallic nanoparticles

Scientific Reports ◽

10.1038/s41598-021-90414-0 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Jien Ye ◽

Yi Wang ◽

Qiao Xu ◽

Hanxin Wu ◽

Jianhao Tong ◽

...

Keyword(s):

Hexavalent Chromium ◽

Removal Efficiency ◽

Photoelectron Spectroscopy ◽

Bimetallic Nanoparticles ◽

Chemical Reduction ◽

Particle Surface ◽

Zerovalent Iron ◽

Order Model ◽

X Ray ◽

Nanoscale Zerovalent Iron

AbstractPassivation of nanoscale zerovalent iron hinders its efficiency in water treatment, and loading another catalytic metal has been found to improve the efficiency significantly. In this study, Cu/Fe bimetallic nanoparticles were prepared by liquid-phase chemical reduction for removal of hexavalent chromium (Cr(VI)) from wastewater. Synthesized bimetallic nanoparticles were characterized by transmission electron microscopy, Brunauer–Emmet–Teller isotherm, and X-ray diffraction. The results showed that Cu loading can significantly enhance the removal efficiency of Cr(VI) by 29.3% to 84.0%, and the optimal Cu loading rate was 3% (wt%). The removal efficiency decreased with increasing initial pH and Cr(VI) concentration. The removal of Cr(VI) was better fitted by pseudo-second-order model than pseudo-first-order model. Thermodynamic analysis revealed that the Cr(VI) removal was spontaneous and endothermic, and the increase of reaction temperature facilitated the process. X-ray photoelectron spectroscopy (XPS) analysis indicated that Cr(VI) was completely reduced to Cr(III) and precipitated on the particle surface as hydroxylated Cr(OH)3 and CrxFe1−x(OH)3 coprecipitation. Our work could be beneficial for the application of iron-based nanomaterials in remediation of wastewater.

Download Full-text

An Amberlite IRA-400 Cl− ion-exchange resin modified with Prosopis juliflora seeds as an efficient Pb2+ adsorbent: adsorption, kinetics, thermodynamics, and computational modeling studies by density functional theory

RSC Advances ◽

10.1039/d0ra10128a ◽

2021 ◽

Vol 11 (8) ◽

pp. 4478-4488

Author(s):

Sivaprakasam Anbazhagan ◽

Venugopal Thiruvengadam ◽

Anandhakumar Sukeri

Keyword(s):

Density Functional Theory ◽

Ion Exchange ◽

Computational Modeling ◽

Removal Efficiency ◽

Adsorption Kinetics ◽

Density Functional ◽

Exchange Resin ◽

Ion Exchange Resin ◽

Prosopis Juliflora ◽

Functional Theory

We have demonstrated a high Pb2+ removal efficiency (73.45%) from wastewater using a Prosopis juliflora-seed-modified Amberlite IRA-400 Cl− ion-exchange resin (SMA resin).

Download Full-text

The enhanced reduction of bromate by highly reactive and dispersive green nano-zerovalent iron (G-NZVI) synthesized with onion peel extract

RSC Advances ◽

10.1039/d0ra09897c ◽

2021 ◽

Vol 11 (9) ◽

pp. 5008-5018

Author(s):

Olga Lem ◽

Sunho Yoon ◽

Sungjun Bae ◽

Woojin Lee

Keyword(s):

Surface Oxidation ◽

Zerovalent Iron ◽

Onion Peel ◽

Nano Zerovalent Iron ◽

First Time ◽

Onion Peel Extract ◽

Peel Extract

In this study, novel green nano-zerovalent iron (G-NZVI) is synthesized for the first time using onion peel extract for the prevention of rapid surface oxidation and the enhancement of particle dispersibility with a high reductive capacity.

Download Full-text