scholarly journals Amorphous mesoporous calcium carbonate and magnesium carbonate as effective sorbents for the removal of phosphate in aqueous solutions

2021 ◽  
Author(s):  
Eveline Croket ◽  
Michelle Åhlén ◽  
Maria Strømme ◽  
Ocean Cheung
Keyword(s):  
Calcium Carbonate ◽  
High Surface ◽  
High Surface Area ◽  
Real Life ◽  
Magnesium Carbonate ◽  
Amorphous Calcium Carbonate ◽  
Uptake Capacity ◽  
Low Concentration ◽  
Low Concentrations ◽  
Highly Porous

In this work, highly porous amorphous calcium carbonate (HPACC) and mesoporous magnesium carbonate (MMC) were tested as potential phosphate (PO43-) sorbents in water. The performance of these sorbents at a PO43- initial concentration between 0 – 1000 mg/L was evaluated. These highly porous materials were found to have enhanced PO43- uptake at low concentrations (<100 mg/L) when compared with commercial CaCO3 and MgCO3. The enhanced uptake on HPACC and MMC at low concentration was due to the high surface area and the porosity of these sorbents. The presence of NaCl salt of up to 1000 mg/L had very little effect on the performance of HPACC (<10% decreased uptake capacity), but the PO43- uptake on MMC reduced to close to zero. HPACC with its high PO43- uptake at low concentration could be relevant for real life application of PO43- ions removal from water.

scholarly journals Highly Porous Carbon Materials from Biomass by Chemical and Carbonization Method: A Comparison Study

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Wan Nor Roslam Wan Isahak ◽  
Mohamed Wahab Mahamed Hisham ◽  
Mohd Ambar Yarmo
Keyword(s):  
Sulfuric Acid ◽  
Thermal Behavior ◽  
Surface Area ◽  
Porous Carbon ◽  
High Surface ◽  
High Surface Area ◽  
Empty Fruit Bunches ◽  
Heating Treatment ◽  
Concentrated Sulfuric Acid ◽  
Highly Porous

Porous carbon obtained by dehydrating agent, concentrated sulfuric acid (H2SO4), from biomass containing high cellulose (filter paper (FP), bamboo waste, and empty fruit bunches (EFB)) shows very high surface area and better thermal behavior. At room temperature (without heating), treatment of H2SO4removed all the water molecules in the biomass and left the porous carbon without emitting any gaseous byproducts. Brunauer-Emmett-Teller (BET) surface analysis has shown that bamboo-based carbon has good properties with higher surface area (507.8 m2/g), micropore area (393.3 m2/g), and better thermal behavior (compared to FP and EFB) without any activation or treatment process. By acid treatment of biomass, it was shown that higher carbon composition obtained from FP (85.30%), bamboo (77.72%), and EFB (76.55%) is compared to carbon from carbonization process. Under optimal sulfuric acid (20 wt.%) uses, high carbon yield has been achieved for FP (47.85 wt.%), bamboo (62.4 wt.%), and EFB (55.4 wt.%).

scholarly journals A review on advanced nanofiber technology for membrane distillation

2019 ◽  
Vol 14 ◽  
pp. 155892501882490 ◽  
Author(s):  
Fatma Yalcinkaya
Keyword(s):  
Tissue Engineering ◽  
Surface Area ◽  
Wound Dressing ◽  
High Surface ◽  
High Surface Area ◽  
Membrane Distillation ◽  
Operating Parameters ◽  
Polymeric Nanofibers ◽  
Highly Porous ◽  
Comprehensive Study

The importance of the nanofiber webs increases rapidly due to their highly porous structure, narrow pore size, and distribution; specific surface area and compatibility with inorganics. Electrospinning has been introduced as one of the most efficient technique for the fabrication of polymeric nanofibers due to its ability to fabricate nanostructures with unique properties such as a high surface area and porosity. The process and the operating parameters affect the nanofiber fabrication and the application of nanofibers in various fields, such as sensors, tissue engineering, wound dressing, protective clothes, filtration, desalination, and distillation. In this review, a comprehensive study is presented on the parameters of electrospinning system including applications. More emphasis is given to the application of nanofibers in membrane distillation (MD). The research developments and the current situation of the nanofiber webs in MD are also discussed.

scholarly journals Cigarette butt-derived carbons have ultra-high surface area and unprecedented hydrogen storage capacity

2017 ◽  
Vol 10 (12) ◽  
pp. 2552-2562 ◽  
Author(s):  
Troy Scott Blankenship ◽  
Robert Mokaya
Keyword(s):  
Hydrogen Storage ◽  
Surface Area ◽  
Storage Capacity ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Storage Capacity ◽  
Cigarette Butt ◽  
Highly Porous

Cigarette butt derived carbons are highly porous (4310 m2 g−1 and 2.09 cm3 g−1) with record levels of hydrogen storage.

scholarly journals Preparation and Characterization of Activated Alumina

2018 ◽  
Vol 34 ◽  
pp. 02052
Author(s):  
A R. Rabia ◽  
A.H. Ibrahim ◽  
N.N. Zulkepli
Keyword(s):  
Pure Aluminum ◽  
High Surface ◽  
High Surface Area ◽  
Sodium Aluminate ◽  
Chemical Mechanism ◽  
Activated Alumina ◽  
Sulfate Ions ◽  
Highly Porous ◽  
Mesh Sieve

Activated alumina is a high surface area and highly porous form of aluminum oxide that can be employed for contaminant species adsorb from ether gases or liquids without changing its form. The research in getting this material has generated huge interested. Thus, this paper presented preparation of activated alumina from chemical process. Pure aluminum (99.9% pure) reacted at room temperature with an aqueous NaOH in a reactor to produce a solution of sodium aluminate (NaAlO2). This solution was passed through filter paper and the clear filtrate was neutralized with H2SO4, to pH 6, 7 or 8, resulting in the precipitation of a white gel, Al(OH)3·XH2O. The washed gel for sulfate ions were dried at 80 °C for 6 h, a 60 mesh sieve was to separate and sort them into different sizes. The samples were then calcined (burn) for 3h in a muffle furnace, in air, at a heating rate of 2 °C min–1. The prepared activated alumina was further characterized for better understanding of its physical properties in order to predict its chemical mechanism.

scholarly journals Highly porous conjugated polymers for selective oxidation of organic sulfides under visible light

2014 ◽  
Vol 50 (60) ◽  
pp. 8177-8180 ◽  
Author(s):  
Zi Jun Wang ◽  
Saman Ghasimi ◽  
Katharina Landfester ◽  
Kai A. I. Zhang
Keyword(s):  
Visible Light ◽  
Conjugated Polymers ◽  
Emulsion Polymerization ◽  
Surface Area ◽  
Selective Oxidation ◽  
High Surface ◽  
High Surface Area ◽  
Organic Sulfides ◽  
Internal Phase ◽  
Highly Porous

High surface area porous conjugated polymers were synthesized via the high internal phase emulsion polymerization technique and micropore engineering as efficient heterogeneous photocatalysts for highly selective oxidation of organic sulfides to sulfoxides under visible light.

Is Mg-stabilized amorphous calcium carbonate a homogeneous mixture of amorphous magnesium carbonate and amorphous calcium carbonate?

2016 ◽  
Vol 52 (77) ◽  
pp. 11527-11530 ◽  
Author(s):  
Sheng-Yu Yang ◽  
Hsun-Hui Chang ◽  
Cang-Jie Lin ◽  
Shing-Jong Huang ◽  
Jerry C. C. Chan
Keyword(s):  
Calcium Carbonate ◽  
Solid State ◽  
Solid State Nmr ◽  
Magnesium Carbonate ◽  
Homogeneous Mixture ◽  
Amorphous Calcium Carbonate ◽  
Nmr Data

13C solid-state NMR data reveal that Mg stabilized amorphous calcium carbonate might be a homogeneous mixture of nanoclusters of amorphous calcium carbonate (ACC) and amorphous magnesium carbonate (AMC).

scholarly journals Applications of electrospun nanofibers in the biomedical field

SURG Journal ◽  
2012 ◽  
Vol 5 (2) ◽  
pp. 63-73 ◽  
Author(s):  
Nishath Khan
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
Volume Ratio ◽  
Electrospun Nanofibers ◽  
Ease Of Use ◽  
The Past ◽  
Wide Range ◽  
Novel Method ◽  
Biomedical Field ◽  
Highly Porous

Electrospinning is a technology that has been widely used as a novel method for the generation of nano scale fibres. Electrospun fibres are used in a wide range of applications from electronics to textile. The viability and popularity of this technology can be evidenced by its ease of use and the simplicity of the science behind building the electrospinning machine. The generated fibres have a high surface area- to- volume ratio, the fibrous mats are highly porous and display excellent mechanical properties when compared to other materials of the same scale. In the past decade, this technology has taken off with the use of biocompatible and biodegradable polymers. This review is a summary of the different ways in which electrospinning can be used in the biomedical field. This article analyzes the recent advances of this technology in tissue engineering, drug delivery and in enzyme immobilisation, which once again showcases the versatility of the electrospinning procedure.

Sign in / Sign up

Export Citation Format

Share Document