scholarly journals The preparation of a novel iron/manganese binary oxide for the efficient removal of hexavalent chromium [Cr(vi)] from aqueous solutions

RSC Advances ◽  
2020 ◽  
Vol 10 (18) ◽  
pp. 10612-10623 ◽  
Author(s):  
Chuanxi Yang ◽  
Tiantian Ju ◽  
Xiaoning Wang ◽  
Yujia Ji ◽  
Cheng Yang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Hydrothermal Method ◽  
Hexavalent Chromium ◽  
Binary Oxide ◽  
Efficient Removal ◽  
Co Precipitation ◽  
Iron Manganese ◽  
Fast Removal

A novel Fe–Mn binary oxide adsorbent prepared via “co-precipitation and hydrothermal” method, for the efficient and fast removal of Cr(vi).

Adsorption behavior and removal mechanism of arsenic on graphene modified by iron–manganese binary oxide (FeMnOx/RGO) from aqueous solutions

RSC Advances ◽  
2015 ◽  
Vol 5 (83) ◽  
pp. 67951-67961 ◽  
Author(s):  
Jin Zhu ◽  
Zimo Lou ◽  
Yu Liu ◽  
Ruiqi Fu ◽  
Shams Ali Baig ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Arsenic Removal ◽  
Binary Oxide ◽  
Adsorption Behavior ◽  
Removal Mechanism ◽  
Composite Adsorbent ◽  
Iron Manganese

Graphene has been used as a supporting matrix to disperse FeMnOx due to its huge specific surface area, and the synthesized novel composite adsorbent (FeMnOx/RGO) was employed for arsenic removal.

scholarly journals Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3081
Author(s):  
Mpho Cynthia Qhubu ◽  
Philiswa Nosizo Nomngongo ◽  
Vusumzi Emmanuel Pakade
Keyword(s):  
Iron Oxide ◽  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Adsorption Model ◽  
Langmuir Adsorption ◽  
Langmuir Adsorption Model ◽  
Spectral Bands ◽  
Pseudo Second Order ◽  
Dilute Aqueous Solutions ◽  
Co Precipitation

The contamination of water resources by toxic hexavalent chromium remains a challenge. In this study, amino-functionalized iron oxide biobased carbon-silica composites were prepared through co-precipitation of Fe(II) and Fe(III) over Macadamia activated carbon and explored as feasible adsorbents for the removal of Cr(VI) from dilute aqueous solutions. The energy dispersive spectroscopy (EDS) elemental analysis confirmed the existence of Fe, Si, O, and C atoms, which form the backbone of the composite. The FTIR also showed the presence of Fe-O and Si-O-Si and Si-OH spectral bands, affirming the backbone of the adsorbents. Cr(VI) adsorption efficiency (5.76 mg/g) was achieved at pH 1 when an initial concentration of 2.5 mg/L, contact time of 90 min, and dosage concentration of 1.7 g/L were used. The data were best described by the Langmuir adsorption model and pseudo-second-order rate model. ΔG° (−3 to −12 kJ/mol) and ΔH° (46, 12 and 5 kJ/mol) values affirmed that the adsorption of Cr(VI) was spontaneous and endothermic and dominated by chemical interactions.

scholarly journals Recyclable functionalized polymer films for the efficient removal of hexavalent chromium from aqueous solutions

RSC Advances ◽  
2019 ◽  
Vol 9 (63) ◽  
pp. 36751-36757 ◽  
Author(s):  
Weikang Liu ◽  
Mei Wang ◽  
Zhigang Wen ◽  
Zhong Li ◽  
Liang Yang ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Composite Film ◽  
Hexavalent Chromium ◽  
Polymer Films ◽  
Reduction Mechanism ◽  
Efficient Removal ◽  
Chromium Ion ◽  
Adsorption Reduction

A PEI-PVA functionalized composite film has been developed to remove hexavalent chromium ion Cr(vi) from water by an adsorption–reduction mechanism.

Magnetic iron–manganese binary oxide supported on carbon nanofiber (Fe3−xMnxO4/CNF) for efficient removal of Hg0 from coal combustion flue gas

2018 ◽  
Vol 334 ◽  
pp. 216-224 ◽  
Author(s):  
Jianping Yang ◽  
Yongchun Zhao ◽  
Shaofeng Liang ◽  
Shibo Zhang ◽  
Siming Ma ◽  
...  
Keyword(s):  
Flue Gas ◽  
Coal Combustion ◽  
Carbon Nanofiber ◽  
Binary Oxide ◽  
Efficient Removal ◽  
Iron Manganese

scholarly journals The Recovery of Phosphate and Ammonium from Biogas Slurry as Value-Added Fertilizer by Biochar and Struvite Co-Precipitation

2021 ◽  
Vol 13 (7) ◽  
pp. 3827
Author(s):  
Aftab Ali Kubar ◽  
Qing Huang ◽  
Muhammad Sajjad ◽  
Yang Chen ◽  
Faqin Lian ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Value Added ◽  
Precipitation Method ◽  
Biogas Slurry ◽  
Efficient Removal ◽  
Renewable Source ◽  
Molar Ratios ◽  
Struvite Precipitation ◽  
Co Precipitation ◽  
High Level

Biowaste materials could be considered a renewable source of fertilizer if methods for recovering P from waste can be developed. Over the last few decades, there has been a high level of interest in using biochar to remove contaminants from aqueous solutions. This study was conducted using a range of salts that are commonly found in biogas slurry (ZnCl2, FeCl3, FeCl2, CuCl2, Na2CO3, and NaHCO3). Experiments with a biogas digester and aqueous solution were conducted at pH nine integration with NH4+, Mg2+, and PO43− molar ratios of 1.0, 1.2, and 1.8, respectively. The chemical analysis was measured to find out the composition of the precipitate, and struvite was employed to remove the aqueous solutions. The study found that the most efficient removal of phosphate and ammonium occurred at pH nine in Tongan sludge urban biochar and rice biochar, respectively. Increasing the concentration of phosphate and ammonium increased the phosphate and ammonium content. Moreover, increasing the biochar temperature and increasing the concentration of phosphate and ammonium increased the efficiency of the removal of ammonium and phosphate. The removal efficiency of ammonium and phosphate increased from 15.0% to 71.0% and 18.0% to 99.0%, respectively, by increasing the dose of respective ions K+, Zn2+, Fe3+, Fe2+, Cu2+, and CO32.The elements were increased from 58.0 to 71.0 for HCO3− with the increasing concentration from 30 mg L−1 to 240 mg L−1.This study concluded that phosphate and ammonium can be recovered from mushroom soil biochar and rice biochar, and phosphate can be effectively recovered via the struvite precipitation method.

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