Development of Mg–Al–La tri-metal mixed oxide entrapped in alginate for removal of fluoride from wastewater

Mesoporous Ce–Al binary oxide nanomaterials prepared with a surface area of 110.32 m2 g−1 showed defluoridation capacity at pH 2.4, exhibited maximum adsorption capacity of 384.6 mg g−1 and a removal efficiency of 91.5% at a small dose of nanoadsorbent.

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Synthesis of a Novel Ce-bpdc for the Effective Removal of Fluoride from Aqueous Solution

Advances in Condensed Matter Physics ◽

10.1155/2017/8305765 ◽

2017 ◽

Vol 2017 ◽

pp. 1-8 ◽

Cited By ~ 2

Author(s):

Changqing Zhao ◽

Yanwei Cui ◽

Fang Fang ◽

Si Ok Ryu ◽

Jiarui Huang

Keyword(s):

Adsorption Capacity ◽

Removal Efficiency ◽

Photoelectron Spectroscopy ◽

Ph Value ◽

Binding Capacity ◽

Fluoride Removal ◽

Maximum Adsorption Capacity ◽

Fluoride Ions ◽

X Ray ◽

Fluoride Adsorption

Ce-1,1′-biphenyl-4,4′-dicarboxylic acid (Ce-bpdc), a novel type of metal organic framework, was synthesized and applied to remove excessive fluoride from water. The structure and morphology of Ce-bpdc were measured by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The effects, such as saturated adsorption capacity, HCO3-, and pH, were investigated. The optimal pH value for fluoride adsorption was the range from 5 to 6. The coexisting bicarbonate anions have a little influence on fluoride removal. The fluoride adsorption over the Ce-bpdc adsorbent could reach its equilibrium in about 20 min. The Ce-bpdc coordination complex exhibited high binding capacity for fluoride ions. The maximum adsorption capacity calculated from Langmuir model was high up to 45.5 mg/g at 298 K (pH = 7.0) and the removal efficiency was greater than 80%. In order to investigate the mechanism of fluoride removal, various adsorption isotherms such as Langmuir and Freundlich were fitted. The experimental data revealed that the Langmuir isotherm gave a more satisfactory fit for fluoride removal. Finally, the tested results of ground water samples from three places, Yuefang, Jiangji, and Sanyi which exhibited high removal efficiency, also demonstrate the potential utility of the Ce-bpdc as an effective adsorbent.

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Adsorption and Catalysis of Orange II from Wastewater by Inorganic-Organic-Bentonite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.340.236 ◽

2011 ◽

Vol 340 ◽

pp. 236-240

Author(s):

Jian Feng Ma ◽

Jian Ming Yu ◽

Bing Ying Cui ◽

Ding Long Li ◽

Juan Dai

Keyword(s):

Adsorption Capacity ◽

Removal Efficiency ◽

Dye Removal ◽

Maximum Adsorption Capacity ◽

Orange Ii ◽

Acid Dye ◽

Secondary Pollution ◽

Organic Bentonite ◽

Maximum Removal

Inorganic-organic-bentonite was synthesized by modification of bentonite by Hydroxy-iron and surfactant, which could be applied in dye removal by adsorption and catalysis. The removal of acid dye Orange II was studied at various factors such as time and pH of solution. The results showed that the inorganic-organic-bentonite could efficiently remove the dye with efficiency of 96.22%. The maximum adsorption capacity is 76 mg/g. The pH of solution has significant effect on both adsorption and catalysis. When pH was 4, the maximum removal efficiency of adsorption and catalysis were 97.57% and 87.23%, respectively. After degradation, the secondary pollution was diminished and the bentonite could be reused.

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Fluoride removal efficiency from aqueous solution by synthetic iron(III)–aluminum(III)–chromium(III) ternary mixed oxide

Desalination ◽

10.1016/j.desal.2010.01.019 ◽

2010 ◽

Vol 255 (1-3) ◽

pp. 44-51 ◽

Cited By ~ 116

Author(s):

Krishna Biswas ◽

Kaushik Gupta ◽

Arijit Goswami ◽

Uday Chand Ghosh

Keyword(s):

Aqueous Solution ◽

Removal Efficiency ◽

Mixed Oxide ◽

Fluoride Removal ◽

Ternary Mixed Oxide

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Effects of Cu(II) on the Adsorption Behaviors of Cr(III) and Cr(VI) onto Kaolin

Journal of Chemistry ◽

10.1155/2016/3069754 ◽

2016 ◽

Vol 2016 ◽

pp. 1-11 ◽

Cited By ~ 8

Author(s):

Juanjuan Liu ◽

Xiaolong Wu ◽

Yandi Hu ◽

Chong Dai ◽

Qin Peng ◽

...

Keyword(s):

Distribution Coefficient ◽

Adsorption Capacity ◽

Removal Efficiency ◽

Saturation Index ◽

Surface Complexation ◽

Maximum Adsorption Capacity ◽

Positive Correlation ◽

Adsorption Sites ◽

Ph Values ◽

Adsorption Behaviors

The adsorption of Cr(III) or Cr(VI) in the absence and presence of Cu(II) onto kaolin was investigated under pH 2.0–7.0. Results indicated that the adsorption rate was not necessarily proportional to the adsorption capacity. The solutions’ pH values played a key role in kaolin zeta potential(ζ), especially the hydrolysis behavior and saturation index of heavy metal ions. In the presence of Cu(II),qmixCr(III)reached the maximum adsorption capacity of 0.73 mg·g−1at pH 6.0, while the maximum adsorption capacity for the mixed Cr(VI) and Cu(II) system (qmixCr(VI)) was observed at pH 2.0 (0.38 mg·g−1). Comparing the adsorption behaviors and mechanisms, we found that kaolin prefers to adsorb hydrolyzed products of Cr(III) instead of Cr3+ion, while adsorption sites of kaolin surface were occupied primarily by Cu(II) through surface complexation, leading to Cu(II) inhibited Cr(VI) adsorption. Moreover, Cr(III) and Cr(VI) removal efficiency had a positive correlation with distribution coefficientKd. Cr(III) and Cr(VI) removal efficiency had a positive correlation with distribution coefficientKdand that of adsorption affinities of Cr(III) or Cr(VI) on kaolin was found to beKdCr(III) <KdCr(III)-Cu(II) andKdCr(VI) >KdCr(VI)-Cu(II).

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

Bioinorganic Chemistry and Applications ◽

10.1155/2019/5840205 ◽

2019 ◽

Vol 2019 ◽

pp. 1-11 ◽

Cited By ~ 3

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.

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Application of Bamboo Shoot Shell in Color Removal from Methylene Blue Solution

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.675-677.489 ◽

2014 ◽

Vol 675-677 ◽

pp. 489-492

Author(s):

Jing Miao Zhang ◽

Zhi Wei Zhong ◽

Da Pan Zhu ◽

Lin Man Lin ◽

Qing Ju Wang ◽

...

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Removal Efficiency ◽

Ph Value ◽

Color Removal ◽

Target Color ◽

Maximum Adsorption Capacity ◽

Bamboo Shoot ◽

Blue Solution ◽

Optimized Conditions

Biosorption of dyeing wastewater is most widely used method so far. The adsorption of methylene blue (MB) with bamboo shoot shell (BSS) as biosorbent was investigated. Orthogonal test was used to optimize the adsorption process, and adsorption capacity and color removal efficiency were used to judge the adsorptivity of BSS. Results showed that maximum adsorption capacity was 225.71 mg·g-1, and color removal efficiency could achieve to 98.96% during the test. To obtain best adsorption capacity, the optimized conditions of temperature, initial concentration of dye, BSS dosage, pH value and adsorption time were 45 °C, 400 mg·L-1, 10 mg/10 mL, 9.6 and 30 min, respectively. As to another target color removal efficiency, the best parameters were 100 mg·L-1, 200 mg/10 mL, 11.5 and 120 min, respectively. The results reveal that the agricultural by-product BSS is an effective biosorbent.

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Potential Use of Alkaline-Activated Indonesian Pumice Powder as Lead Adsorbent in Solution System

Sains Tanah - Journal of Soil Science and Agroclimatology ◽

10.20961/stjssa.v16i2.34621 ◽

2019 ◽

Vol 16 (2) ◽

pp. 203

Author(s):

Faridlotul Hasanah ◽

Syaiful Anwar ◽

Arief Hartono ◽

Untung Sudadi

Keyword(s):

Adsorption Capacity ◽

Removal Efficiency ◽

Low Cost ◽

Physicochemical Characteristics ◽

Maximum Adsorption Capacity ◽

Lead Removal ◽

Isothermal Adsorption ◽

Adsorption Models ◽

Volcanic Material ◽

Potential Use

Pumice is a volcanic material that found abundant in Indonesia. Owing to its physicochemical characteristics it can be utilized as a low-cost natural adsorbent for cationic contaminants. This study aimed to assess the performances of adsorbents prepared from NaOH-activated powder of Lombok and Kediri pumices for lead removal in solution systems based on their maximum adsorption capacity and removal efficiency parameters. The adsorption tests were done in batch experimentation using pumice powder of 74 μm particle size activated with 0.5, 1, and 2 M NaOH and lead solutions with initial concentrations of 0-260 mg.L-1. The most favorable NaOH activation concentration for both pumices was 0.5 M which resulted from Lombok pumice prepared-adsorbent with Pb maximum adsorption capacity based on linearized conventional and rearranged Langmuir isothermal adsorption models of 236.4 and 186.3 mg.g-1, while those of Kediri pumice were of 218.4 and 210.8 mg.g-1, respectively. The removal efficiency of both adsorbents were >80% at the initial Pb concentration of <100 mg.L-1 and around 50-80% at 100-260 mg.L-1. Both pumices are therefore considered potential to be utilized as an adsorbent for cationic contaminants in solution systems with reliable performances.

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Novel Magnetic Nanostructured Beads for Cadmium(II) Removal

Nanomaterials ◽

10.3390/nano9030356 ◽

2019 ◽

Vol 9 (3) ◽

pp. 356 ◽

Cited By ~ 11

Author(s):

Lisandra de Castro Alves ◽

Susana Yáñez-Vilar ◽

Yolanda Piñeiro-Redondo ◽

José Rivas

Keyword(s):

Activated Carbon ◽

Adsorption Capacity ◽

Removal Efficiency ◽

Sorption Isotherms ◽

Nanostructured Material ◽

Maximum Adsorption Capacity ◽

Cadmium Removal ◽

Rotating Speed ◽

Experimental Parameters ◽

Spherical Structures

This study presents an effective magnetic separation method for cadmium removal, based on the use of a novel nanostructured material as an adsorbent. This adsorbent involves the incorporation of magnetite nanoparticles (Fe3O4-NPs), synthesized by the reverse coprecipitation method, into sodium alginate and activated carbon to form spherical structures by crosslinking Ca2+ ions with the charged alginate chains, referred to as magnetic alginate activated carbon (MAAC) beads. The effect of the experimental parameters, such as pH, contacting time, adsorbent dosage, agitation type, and rotating speed were investigated and optimized for an efficient removal of Cd(II) ions at an initial concentration of 250 mg/L. The amount of adsorbed Cd(II) by MAAC beads increased at a pH of 6 with a removal efficiency over 90%. The maximum adsorption capacity reached was 70 mg/g of adsorbent at an initial Cd(II) concentration of 150 mg/L, whereas at 250 mg/L the adsorption capacity lowered until 60 mg/g. Sorption isotherms were calculated using Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich equations, and were better described by the Freundlich and Temkin models. These results proved the removal efficiency and the potential use under real environmental conditions of the MAAC beads, due to their easy recovery from contaminated aqueous solutions.

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Nanosized Spinel Ferrites Synthesized by Sol-Gel Autocombustion for Optimized Removal of Azo Dye from Aqueous Solution

Journal of Nanomaterials ◽

10.1155/2015/713802 ◽

2015 ◽

Vol 2015 ◽

pp. 1-13 ◽

Cited By ~ 18

Author(s):

Petrisor Samoila ◽

Corneliu Cojocaru ◽

Igor Cretescu ◽

Catalina Daniela Stan ◽

Valentin Nica ◽

...

Keyword(s):

Free Energy ◽

Adsorption Capacity ◽

Removal Efficiency ◽

Desirability Function ◽

Sol Gel ◽

Dye Adsorption ◽

Spinel Ferrites ◽

Maximum Adsorption Capacity ◽

Transmission Electron ◽

Endothermic Process

Nanosized spinel ferrites MFe2O4(M = Ni, Co, and Zn) have been prepared by sol-gel autocombustion method using citric acid as a fuel agent. The materials are characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM). The spinel ferrites have been applied for Congo-Red (CR) dye adsorption using batch technique. Different kinetic and equilibrium models have been fitted by nonlinear regression to analyze the adsorption data. In accordance with Langmuir isotherm, the maximum adsorption capacity at 293 K is 14.06 mg/g for CoFe2O4and 17.13 mg/g for NiFe2O4. The values of mean free energy determined from Dubinin-Radushkevich isotherm are higher than 8 (kJ mol−1), indicating a chemisorption mechanism. Based on the calculated thermodynamic parameters (free energy, enthalpy, and entropy) the adsorption of CR onto ferrites is a spontaneous and endothermic process. Response surface methodology has been applied to construct the multiple regression models for prediction of the adsorption capacity and removal efficiency. The model-based optimization has been performed using genetic algorithms and desirability function approach. The single-objective optimization has yielded a maximum value of color removal efficiency of 98.995%, using NiFe2O4adsorbent. The multiobjective optimization has resulted in the improvement of both removal efficiency and adsorption capacity.

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