Arsenate removal from aqueous solutions using magnetic mesoporous iron manganese bimetal oxides

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4058-4068 ◽  
Author(s):  
Zhipan Wen ◽  
Chaomeng Dai ◽  
Yan Zhu ◽  
Yalei Zhang
Keyword(s):  
Aqueous Solutions ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
High Specific Surface Area ◽  
Iron Manganese

A novel MMIM with high specific surface area and pore volume was synthesized, and presented excellent performances for As(v) removal.

Facile Preparation of Iron-Manganese Oxide@Diatomite Composite for Effective Removal of Vanadium from Wastewater

2019 ◽  
Vol 72 (9) ◽  
pp. 717
Author(s):  
Junying Song ◽  
Zhanbin Huang ◽  
Fengzhi Yang
Keyword(s):  
Specific Surface ◽  
Manganese Oxide ◽  
Surface Area ◽  
Specific Surface Area ◽  
Photoelectron Spectroscopy ◽  
Pore Volume ◽  
Low Cost ◽  
Order Kinetic ◽  
Environmental Friendliness ◽  
Iron Manganese

Excess pentavalent vanadium(v) has severely degraded water quality and posed a huge threat to human health over the past several decades. Hence, it’s urgent and significant to explore a novel adsorbent which is low cost and efficient to treat vanadium pollution. In this work, a novel iron-manganese oxide@diatomite (MnFe2O4@DE) adsorbent with superior removal performance for simulated vanadium(v) wastewater was synthesised via a facile hydrothermal method. The as-prepared MnFe2O4@DE composite was characterised through different characterisation techniques. The results indicated that the MnFe2O4 nanoparticles were uniformly deposited on the surface of diatomite, resulting in a larger specific surface area and pore volume of the composite. In addition, the MnFe2O4@DE adsorbent exhibited the highest adsorption capacity for vanadium(v) (18.37mgg−1±0.5%), which was up to around 13.24 and 1.33 times as much as that of pure diatomite and MnFe2O4, respectively. This is mainly attributed to the enhanced specific surface area and pore volume. Furthermore, X-ray photoelectron spectroscopy (XPS) analysis demonstrated vanadium(v) could be reduced to low valence vanadium with low toxicity by the MnFe2O4@DE composite which could exist as VO2+ and VO+ cations in solution. The adsorption process was better fitted with a pseudo-second-order kinetic model and Langmuir model, which is spontaneous and endothermic. Overall, the novel MnFe2O4@DE composite could be applied as a promising adsorbent in addressing vanadium pollution issues due to its properties of low cost, effectiveness, and environmental friendliness.

scholarly journals A large-surface-area TS-1 nanocatalyst: a combination of nanoscale particle sizes and hierarchical micro/mesoporous structures

RSC Advances ◽  
2019 ◽  
Vol 9 (17) ◽  
pp. 9694-9699 ◽  
Author(s):  
Changlin Du ◽  
Nan Cui ◽  
Linghao Li ◽  
Zile Hua ◽  
Jianlin Shi
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Total Pore Volume ◽  
High Specific Surface Area ◽  
Particle Sizes ◽  
Top Down ◽  
First Time ◽  
Mesoporous Structures

By dry-gel steam-assisted crystallization and top-down alkali-etching treatment, hierarchically structured TS-1 nanozeolites with abundant micro/mesopores were synthesized for the first time, with high specific surface area of 606 m2 g−1 and total pore volume of 0.86 cm3 g−1.

Optimization of Experimental Conditions for the Preparation of High Specific Surface Area Bamboo-Based Activated Carbon

2015 ◽  
Vol 1090 ◽  
pp. 154-159
Author(s):  
Sheng Zhou Zhang ◽  
Hong Ying Xia ◽  
Li Bo Zhang ◽  
Jin Hui Peng ◽  
Jian Wu ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Total Pore Volume ◽  
High Specific Surface Area ◽  
Raw Material ◽  
Experimental Conditions ◽  
Average Pore

Bamboo as the raw material is carbonized to prepare high specific surface area activated carbon by microwave heating under nitrogen atmosphere in our present work. Influences of activation agents on the preparation of activated carbon are studied. The results show that activation agents have a significant influence on the preparation of activated carbon. Under the heating time of 15 min, the adsorption capacity of the activated carbon prepared utilizing KOH as activation agent is the best. When the KOH/C ratio is 4, the iodine number and yield of activated carbon are 2298 mg/g and 39.82%, respectively. The BET specific surface area, total pore volume and average pore diameter of activated carbon are 3441 m2/g, 2.093 ml/g and 2.434 nm, respectively. The micropore volume of 1.304 ml/g is 62.30% of total pore volume, indicating that the activated carbon is microporous activated carbon.

scholarly journals Synthesis of dense porous layered double hydroxides from struvite

2021 ◽  
Vol 23 (4) ◽  
pp. 1616-1620
Author(s):  
W. L. Joyce Kwok ◽  
Hongri Suo ◽  
Chunping Chen ◽  
D. W. Justin Leung ◽  
Jean-Charles Buffet ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Layered Double Hydroxides ◽  
Pore Volume ◽  
Wastewater Treatment Plants ◽  
High Specific Surface Area ◽  
Large Pore Volume ◽  
Double Hydroxides

An atom economic synthesis of dense porous layered double hydroxides (SLDHs) using an undesirable waste in wastewater treatment plants (struvite) is reported. The obtained SLDHs show high specific surface area, large pore volume and high density.

scholarly journals Synthesis of micro-mesopores flowerlike γ-Al2O3 nano-architectures

2014 ◽  
Vol 79 (8) ◽  
pp. 1007-1017 ◽  
Author(s):  
Mozaffar Abdollahifar ◽  
Reza Zamani ◽  
Ehsan Beiygie ◽  
Hosain Nekouei
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Total Pore Volume ◽  
High Specific Surface Area ◽  
X Ray Diffraction ◽  
N2 Adsorption ◽  
X Ray ◽  
Adsorption Desorption

The micro-mesopores flowerlike ?-Al2O3 nano-architectures have been synthesized by thermal decomposition method using the synthesized AlOOH (boehmite) as precursor. After calcination at 500?C for 5 h, the obtained flowerlike ?-Al2O3 has similar structure like the AlOOH precursor. X-ray diffraction (XRD), FTIR, TG, FESEM and TEM techniques were used to characterize morphology and structure of the synthesized samples. The specific surface area (BET), pore volume and pore-size distribution of the products were determined by N2 adsorption-desorption measurements. The flowerlike ?-Al2O3 showed BET high specific surface area 148 m2 g-1 with total pore volume 0.59 cm3 g-1.

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.

Removing Lead Ions from Aqueous Solutions with Sulfur-Impregnated Adsorbents

2013 ◽  
Vol 684 ◽  
pp. 198-202 ◽  
Author(s):  
Takaaki Wajima
Keyword(s):  
Aqueous Solutions ◽  
Specific Surface ◽  
Surface Area ◽  
Sulfur Content ◽  
Specific Surface Area ◽  
Selective Adsorption ◽  
High Specific Surface Area ◽  
Lead Ions ◽  
Adsorption Ability ◽  
High Sulfur Content

The removal of lead ions from aqueous solutions was studied using a sulfur-impregnated adsorbent. Coal was mixed with K2S powder and then heated at 800°C for 30 min in nitrogen to produce a sulfur-impregnated adsorbent. The sulfur-impregnated adsorbent prepared had a high sulfur content and high specific surface area. The adsorbent showed a high removal ability for lead ions, and a high removal ratio for lead ions in binary Pb2+-Na+ and Pb2+-Mg2+ solutions. This characteristics were similar to unitary Pb2+ solutions. These results indicate that the sulfur-impregnated adsorbent has a high selective adsorption ability for lead ions in aqueous solutions.

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