The Fluoride-adsorption Capacity and Influencing Factors Study of Zeolite

2010 ◽  
Author(s):  
Sun Xingbin ◽  
Xi Chengju ◽  
Hou Zhaochao
Keyword(s):  
Adsorption Capacity ◽  
Influencing Factors ◽  
Fluoride Adsorption

Performance and characteristics of fluoride adsorption using nanomagnetite graphite–La adsorbent

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89594-89602 ◽  
Author(s):  
Shuangxi Wen ◽  
Yili Wang ◽  
Shuoxun Dong
Keyword(s):  
Adsorption Capacity ◽  
High Adsorption ◽  
Fluoride Adsorption ◽  
High Adsorption Capacity

Nanomagnetite graphite–La was a promising adsorbent for effective F− removal with high adsorption capacity and stable reuse ability.

scholarly journals Mg-Al Mixed Oxide Adsorbent Synthesized Using FCT Template for Fluoride Removal from Drinking Water

2019 ◽  
Vol 2019 ◽  
pp. 1-11 ◽  
Author(s):  
Jifa Liu ◽  
Ping Zhao ◽  
Yue Xu ◽  
Xibin Jia
Keyword(s):  
Drinking Water ◽  
Adsorption Capacity ◽  
Mixed Oxide ◽  
Photoelectron Spectroscopy ◽  
Raw Materials ◽  
Molar Ratio ◽  
Fluoride Removal ◽  
Hydroxyl Groups ◽  
X Ray ◽  
Fluoride Adsorption

To make full use of natural waste, a novel Mg-Al mixed oxide adsorbent was synthesized by the dip-calcination method using the fluff of the chinar tree (FCT) and an Mg(II) and Al(III) chloride solution as raw materials. The adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The effects of the Mg/Al molar ratio and calcination temperature on the performance of the novel Mg-Al mixed oxide adsorbent were investigated. The optimized Mg-Al mixed oxide adsorbent had a Langmuir adsorption capacity of 53 mg/g. This adsorption capacity was higher than that of the separate Mg oxide and Al oxide. The synergy between Mg and Al is beneficial to the adsorption performance of the material. The fluoride adsorption capacity of the optimized Mg-Al mixed oxide adsorbent is only slightly affected by ions such as Cl−, NO3−, SO42−, Na+, and K+and is excellent for use in recycling and real water. The hydroxyl groups on the surface of the Mg-Al mixed oxide adsorbent play a key role in the adsorption of fluorine. The as-obtained novel Mg-Al mixed oxide adsorbent is an efficient and environmentally friendly agent for fluoride removal from drinking water.

scholarly journals Repeated Heat Regeneration of Bone Char for Sustainable Use in Fluoride Removal from Drinking Water

Healthcare ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 143 ◽  
Author(s):  
H. Herath ◽  
Tomonori Kawakami ◽  
Masamoto Tafu
Keyword(s):  
Adsorption Capacity ◽  
Low Cost ◽  
Sustainable Use ◽  
Chemical Precipitation ◽  
Fluoride Removal ◽  
Bone Char ◽  
Fluoride Adsorption ◽  
Heat Regeneration ◽  
Recovery Percentage ◽  
Regeneration Of Bone

The effectiveness of regenerated chicken bone char (CBC) in fluoride removal was investigated in the present study. Heat treatment was studied as the regeneration method. Results revealed that the CBC regenerated at 673 K yielded the highest fluoride adsorption capacity, hence, 673 K was the best regenerating temperature. The study continued up to five regeneration cycles at the best regenerating temperature; 673 K. The CBC accounted to 16.1 mg F/g CBC as the total adsorption capacity after five regeneration cycles. The recovery percentage of CBC reduced from 79% at the first regeneration to 4% after five regeneration cycles. The hydroxyapatite structure of CBC was not changed during the fluoride adsorption by five regeneration cycles. The ion exchange incorporated with the chemical precipitation occurred during the fluoride adsorption. The repeated regeneration of CBC is possible and it could be used as a low cost defluoridation technique to minimize the wastage of bone char.

Adsorption Removal of Fluoride from Aqueous Solution by Hydroxy-Iron Pillared Montmorillonite

2013 ◽  
Vol 781-784 ◽  
pp. 2273-2276
Author(s):  
Shi Yong Wei ◽  
Xu Hong Deng
Keyword(s):  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Interlayer Spacing ◽  
Multilayer Adsorption ◽  
Pillared Montmorillonite ◽  
Fluoride Adsorption ◽  
Adsorption Behaviors ◽  
Adsorption Removal ◽  
Adsorption Data ◽  
Adsorption Processes

Hydroxy-iron pillared montmorillonite (Fe-Mont) was prepared and characterized, and the fluoride adsorption capacity of Fe-Mont was investigated. Compared to pure montmorillonite (Mont), the interlayer spacing, specific surface area (SSA), surface fractal dimension and isoelectric point (IEP) of Fe-Mont increased. At pH 4.5, the Langmuir adsorption capacity (qmax) for fluoride of Mont and Fe-Mont was 4.23 and 6.92 mg/g, respectively. The adsorption data for fluoride by Fe-Mont could be fitted by Langmuir model (R2 =0.986) and also by Freundlich isotherm (R2 =0.948), and indicating that the monolayer and multilayer adsorption behaviors are simultaneously involved in the fluoride adsorption processes of Fe-Mont.

Defluoridation of water by chemical impregnated Artocarpus hirsutus sawdust

2016 ◽  
Vol 16 (5) ◽  
pp. 1297-1312 ◽  
Author(s):  
P. Dhanasekaran ◽  
P. M. Satya Sai ◽  
C. Anandbabu ◽  
K. K. Rajan
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Adsorption Capacity ◽  
Size Distribution ◽  
Surface Characterization ◽  
Ferric Hydroxide ◽  
Activated Alumina ◽  
Column Studies ◽  
Fluoride Adsorption ◽  
Defluoridation Of Water

Sawdust of Artocarpus hirsutus impregnated with ferric hydroxide and activated alumina (SFAA) has been studied for defluoridation of water. This paper presents a detailed surface characterization of the adsorbent by studying pore size distribution and surface morphology. By combining the constituents in the right proportion, an adsorbent with a well-developed pore size distribution could be synthesized. The effects of various parameters on fluoride adsorption by SFAA are investigated. The adsorption capacity of SFAA is considerably higher than that of many adsorbents including activated alumina. More importantly, the adsorption capacity remains unchanged for the pH range of 1 to 9, which also makes it attractive for wastewater treatment. Besides a higher efficiency supported by the results of column studies, this adsorbent is economic as the sawdust constitutes 40% by weight of the total adsorbent. Kinetic studies indicate that fluoride adsorption on SFAA follows pseudo second-order model. Breakthrough adsorption capacity of SFAA is 1.21 mg/g, as compared with 0.41 mg/g for activated alumina.

scholarly journals Univariate and Multivariate Analyses of Influencing Factors on Methane Adsorption Capacity of Semianthracite

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Shihui Hou ◽  
Xiaoming Wang ◽  
Yudong Yuan ◽  
Sidong Pan ◽  
Zheng Dang ◽  
...  
Keyword(s):  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Influencing Factors ◽  
Specific Surface Area ◽  
Multivariate Analyses ◽  
Methane Adsorption ◽  
Coal Rank ◽  
Strong Positive Correlation ◽  
Quantification Theory

Methane adsorption isotherm experiments on semianthracite (2.00-2.33% R o , max ) collected from the Xin’an coal mine, Henan Province, China, were conducted to investigate the effects of pore structure, coal quality, coal maceral, and coal rank on methane adsorption capacity with applications of univariate and multivariate analyses. Methane adsorption capacity varies significantly from 12.03 to 28.40 cm3/g. In univariate analysis, methane adsorption capacity has a strong positive correlation with pore specific surface area, weak positive correlations with pore volume and ash content, and weak negative correlations with moisture content and inertinite content. No correlation is observed between methane adsorption capacity and coal rank. In multivariate analysis, the mathematical model of methane adsorption capacity affected by the combined individual variables is established based on quantification theory I. There are similarities and differences between the two analyses. The similarities are that pore specific surface area has the greatest contribution to methane adsorption capacity, while coal rank has the least contribution. The differences are reflected in two aspects. Firstly, the other influencing factors contribute differently to methane adsorption capacity. Secondly, the positive or negative correlations of some influencing factors present the opposite. The mathematic model synthetically covers the combined effects of the influencing factors, which is more representative in evaluating methane adsorption capacity.

scholarly journals Adsorption of Fluoride Ion onto Zirconyl-Impregnated Activated Carbon Prepared from Lapsi Seed Stone

2013 ◽  
Vol 30 ◽  
pp. 13-23 ◽  
Author(s):  
Sahira Joshi ◽  
Mandira Adhikari ◽  
Raja Ram Pradhananga
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Zinc Chloride ◽  
Contact Time ◽  
Activated Carbons ◽  
Low Cost ◽  
Chemical Society ◽  
Nitrogen Atmosphere ◽  
Batch Mode ◽  
Fluoride Adsorption

The potentials of activated carbon derived from Lapsi (Choerospondias axillaries) seed stone after impregnation with zirconium for adsorptive removal of fluoride is presented. Activated carbons from Lapsi seed stone were prepared by three different techniques. Firstly by directly burning in limited supply of air, secondly by treating with a mixture of conc. H2SO4 and HNO3 (in the ratio of 1:1 by weight) and thirdly by activation with zinc chloride (in the ratio of 1:1 by weight) followed by carbonization at 400°C and 500°C under nitrogen atmosphere. Thus prepared carbons were impregnated with zirconyl oxychloride and effects of pH, adsorbent dose, and contact time and adsorbate concentration for the removal of fluoride were evaluated by batch mode. The optimum pH for adsorption of fluoride was observed at pH 3-4, and a minimum contact time for the maximum defluoridation was found to be 180 min. The Langmuir and Freundlich isotherms were used to describe adsorption equilibrium. Zirconium impregnation increased the fluoride adsorption capacity of carbon to considerable extent. Among carbon prepared by three different techniques, the carbon prepared from zinc chloride activation followed by carbonization showed relatively higher fluoride adsorption capacity. From the experiment it is concluded that activated carbon prepared from Lapsi seed is an efficient, low-cost alternative to commercial activated carbon for defluoridation of water.DOI: http://dx.doi.org/10.3126/jncs.v30i0.9330Journal of Nepal Chemical Society Vol. 30, 2012 Page:  13-23 Uploaded date: 12/16/2013    

Research on the Effect of Calcined Mg/Al Layered Double Hydroxides on Fluoride in Water Based on Adsorption Kinetics Model

2014 ◽  
Vol 1015 ◽  
pp. 557-561
Author(s):  
Zi Xin Guo
Keyword(s):  
Differential Equation ◽  
Partial Differential Equation ◽  
Adsorption Capacity ◽  
Memory Function ◽  
Basic Structure ◽  
Validity And Reliability ◽  
Adsorption Model ◽  
Partial Differential ◽  
Capacity Curves ◽  
Fluoride Adsorption

Calcined Mg/Al layered double hydroxide is called CLDH for short. It is one of lamellar compound which has been wildly applied in water treatment. Its structure is relatively complex and has a strong adsorption capacity for the fluoride in water. The basic structure is the charge-layered structure with memory function. This paper introduces the theory of partial differential equation into CLDH dynamic adsorption model and establishes partial differential equation of adsorption stress of CLDH and analyses experimental data through Matlab algorithm. In order to validate the validity and reliability of dynamic model and Matlab algorithm, this paper roasts LDH through experiments and obtains CLDH fluoride-adsorption capacity curves with different PH values ​​and different calcination temperature which provides a theoretical basis for the study of the ability of CLDH to remove fluoride ion in water.

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