Biopolymer-induced calcium phosphate scaling in membrane-based water treatment systems: Langmuir model films studies

2016 ◽  
Vol 143 ◽  
pp. 233-242 ◽  
Author(s):  
Yara N. Dahdal ◽  
Yoram Oren ◽  
Dietmar Schwahn ◽  
Vitaliy Pipich ◽  
Moshe Herzberg ◽  
...  
Keyword(s):  
Water Treatment ◽  
Calcium Phosphate ◽  
Langmuir Model

A protocol to develop crack-free biomimetic coatings on Ti6Al4V substrates

2007 ◽  
Vol 22 (6) ◽  
pp. 1593-1600 ◽  
Author(s):  
Sahil Jalota ◽  
Sutapa Bhaduri ◽  
Sarit B. Bhaduri ◽  
A. Cuneyt Tas
Keyword(s):  
Water Treatment ◽  
Calcium Phosphate ◽  
Alkali Treatment ◽  
Sodium Titanate ◽  
Calcium Phosphate Coating ◽  
First Case ◽  
Phosphate Coatings ◽  
Biomimetic Coating ◽  
One Step ◽  
Calcium Phosphate Coatings

Biomimetic coating of titanium and related alloys with carbonated apatitic calcium phosphate is an important area of research in implantology. While this paper specifically refers to coating Ti6Al4V, the results are valid with other related alloys as well. One step in the protocol involves an intermediate alkali treatment of Ti6Al4V to form a sodium titanate layer on the alloy surface. This pretreatment enhances the formation of the coating from simulated body fluid (SBF) solutions. Many papers in the biomimetic coating literature demonstrate the presence of cracks in coatings, irrespective of the SBF compositions and placement of the substrates. The presence of cracks may result in degradation and delamination of coatings. To the best of our knowledge, this issue remains unresolved. Therefore, the aim of this study was: (i) to examine and understand the reasons for cracking and (ii) based on the results, to develop a protocol for producing crack-free apatitic calcium phosphate coatings on Ti6Al4V substrates. In this study, the authors focused their attention on the alkali treatment procedure and the final drying step. It is hypothesized that these two steps of the process affect the crack formation the most. In the first case, the surfaces of alkali-treated substrates were examined with/without water-soaking treatment before immersing in SBF. This water treatment modifies the sodium titanate surface layer. In the second case, two different drying techniques (after soaking in SBF) were used. In one procedure, the coated substrates were dried rapidly, and in the other they were dried slowly. It was observed that the water treatment, irrespective of the drying method, provides a surface, which on subsequent soaking in SBF forms a crack-free apatitic calcium phosphate coating. Based on these results, the authors suggest a protocol incorporating a water-soaking treatment after the alkali treatment and prior to the SBF soaking treatment to obtain crack-free coatings.

Amorphous calcium phosphate nanowires prepared using beta-glycerophosphate disodium salt as an organic phosphate source by a microwave-assisted hydrothermal method and adsorption of heavy metals in water treatment

RSC Advances ◽  
2015 ◽  
Vol 5 (50) ◽  
pp. 40154-40162 ◽  
Author(s):  
Guan-Jun Ding ◽  
Ying-Jie Zhu ◽  
Chao Qi ◽  
Tuan-Wei Sun ◽  
Jin Wu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Water Treatment ◽  
Calcium Phosphate ◽  
Hydrothermal Method ◽  
Amorphous Calcium Phosphate ◽  
Disodium Salt ◽  
Organic Phosphate ◽  
Microwave Assisted ◽  
Phosphate Source

Amorphous calcium phosphate nanowires were prepared using β-glycerophosphate disodium salt as the phosphate source by a microwave-assisted hydrothermal method.

The para-caseinate-phosphate complex of washed rennet curd: its composition and its decomposition by water, sodium chloride solutions, and lactic acid solutions

1966 ◽  
Vol 33 (2) ◽  
pp. 151-160 ◽  
Author(s):  
E. R. Ling
Keyword(s):  
Aqueous Solution ◽  
Lactic Acid ◽  
Sodium Chloride ◽  
Water Treatment ◽  
Calcium Phosphate ◽  
Acid Solutions ◽  
Magnesium Citrate ◽  
Chloride Solutions ◽  
Sodium Chloride Solutions ◽  
Extensive Release

SummaryWashed rennet curd releases significant quantities of calcium phosphate and relatively small quantities of calcium para-caseinate when shaken with water. Treatment with small quantities of sodium chloride in aqueous solution similarly differentiates between these 2 components, but larger quantities attack both phosphate and para-caseinate with equal severity. A more extensive release of Ca and inorganic Poccurs when the curd is treated with lactic acid solutions; the comparative ease with which Mg is removed under these conditions suggests that Mg is present as magnesium citrate.

scholarly journals Facial Synthesis of Adsorbent from Hemicelluloses for Cr(VI) Adsorption

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1443
Author(s):  
Yi Wei ◽  
Wei Chen ◽  
Chuanfu Liu ◽  
Huihui Wang
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Adsorption Capacity ◽  
Low Cost ◽  
Waste Water Treatment ◽  
Ammonia Solution ◽  
Langmuir Model ◽  
Raw Material ◽  
Maximum Adsorption Capacity ◽  
Chemical Fiber

It is challenging work to develop a low-cost, efficient, and environmentally friendly Cr(VI) adsorbent for waste water treatment. In this paper, we used hemicelluloses from chemical fiber factory waste as the raw material, and prepared two kinds of carbon materials by the green hydrothermal method as adsorbent for Cr(VI). The results showed that hemicelluloses hydrothermally treated with citric acid (HTC) presented spherical shapes, and hemicelluloses hydrothermally treated with ammonia solution (HTC-NH2) provided spongy structures. The adsorption capacity of the samples can be obtained by the Langmuir model, and the adsorption kinetics could be described by the pseudo-second-order model at pH 1.0. The maximum adsorption capacity of HTC-NH2 in the Langmuir model is 74.60 mg/g, much higher than that of HTC (61.25 mg/g). The green hydrothermal treatment of biomass with ammonia solution will provide a simple and feasible way to prepare adsorbent for Cr(VI) in waste water treatment.

scholarly journals Calcium phosphate granules recovered from black water treatment: A sustainable substitute for mined phosphorus in soil fertilization

2020 ◽  
Vol 158 ◽  
pp. 104791 ◽  
Author(s):  
Jorge Ricardo Cunha ◽  
Chris Schott ◽  
Renata D. van der Weijden ◽  
Lucía Hernández Leal ◽  
Grietje Zeeman ◽  
...  
Keyword(s):  
Water Treatment ◽  
Calcium Phosphate ◽  
Soil Fertilization ◽  
Black Water

scholarly journals Quantification and Removal of Trichloromethane in Chlorinated Water Using Coconut Shell Activated Carbon

2020 ◽  
Vol 61 (1) ◽  
pp. 1-14
Author(s):  
A. A. Okoya ◽  
O. E. Akinola ◽  
O. S. Adegbaju ◽  
A. B. Akinyele ◽  
O. S. Amuda
Keyword(s):  
Activated Carbon ◽  
Water Treatment ◽  
Physicochemical Parameters ◽  
Elemental Carbon ◽  
Langmuir Model ◽  
Coconut Shell ◽  
Optimum Conditions ◽  
Carbon Yield ◽  
Percentage Removal ◽  
Coconut Shell Activated Carbon

Commercially, available activated carbon (CAC) and coconut shell activated carbon (CSAC) were used in the adsorption of Trichloromethane (TCM) from disinfected water using the optimum conditions (concentration, dosage, pH and time) obtained. Concentrations of TCM were determined using GC-MS. Physicochemical parameters of CSAC were investigated. The CSAC gave percentage carbon yield (86.72±1.41), surface area 1200 m2/g and CHNS/O Elemental Analyzer gave elemental Carbon of 60.08% as the highest of the elements in the char. A pore structure dispersed on the CSAC surface was observed. Best conditions for CSAC were: 1.4 × 104μg/l TCM, 5.0 pH, 0.8 g absorbent within 30 minutes. The data fitted Freundlich than Langmuir model (R2 of 0.9977 and 0.9232, respectively). Percentage removal of TCM for CAC and CSAC was 98.3±1.55 and 96.7±1.27, respectively for the water sample. Results indicated that CSAC was efficient for removal of TCM present in water and could be used as alternative for CAC in water treatment.

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