scholarly journals A Comparison Study on the Arsenate Adsorption Behavior of Calcium-Bearing Materials

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 1936
Author(s):  
Han Wang ◽  
Hong Zhu
Keyword(s):  
Aqueous Solution ◽  
Chemical Stability ◽  
Adsorption Mechanism ◽  
Calcium Content ◽  
Surface Characteristics ◽  
Adsorption Behavior ◽  
Comparison Study ◽  
Comprehensive Properties ◽  
High Efficient ◽  
Bearing Materials

The calcium-bearing adsorbents are widely used in the treatment of arsenic-containing wastewater due to their excellent treatment effect and economy. In order to obtain high-efficient adsorbents for arsenate (As(V)) removal, the adsorption behavior of calcium oxide (CaO), calcium fluoride (CaF2) and calcium carbonate (CaCO3) on As(V) in aqueous solution at different concentrations were explored. The adsorption mechanism was also explored based on surface characteristics: morphology, specific surface area, as well as their effective calcium content. Not only that, the chemical stability of these materials was further studied. Results exhibited that the As(V) removal capability of these materials is in the following order, CaO > CaF2 > CaCO3. When CaO served as an absorbent, As(V) with initial concentration of 0.2 mg/L can be reduced to 0.383 × 10−3 mg/L in 10 min. Moreover, the capabilities of CaO, CaF2 and CaCO3 for removing As(V) are positively correlated with their effective calcium content in aqueous solution, which provide the basis for selecting calcium-bearing materials with excellently comprehensive properties for the field of As(V) removal in aqueous solution. What’s more, all three materials exhibit great chemical stability after adsorption of As(V).

Adsorption behavior of carboxymethyl konjac glucomannan microspheres for fluoride from aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89417-89429 ◽  
Author(s):  
Liping Wu ◽  
Xiaoyan Lin ◽  
Jiajie Wu ◽  
Xingbao Zhou ◽  
Xuegang Luo
Keyword(s):  
Aqueous Solution ◽  
Electrostatic Interaction ◽  
Adsorption Mechanism ◽  
Konjac Glucomannan ◽  
Adsorption Behavior ◽  
Schematic Diagram ◽  
Carboxymethyl Konjac Glucomannan ◽  
Coordination Reaction

The CMKGM–La–Al is characterized by SEM, EDX, and XPS. We find that adsorption mechanism of the adsorbent involved coordination reaction and electrostatic interaction. The schematic diagram of preparation of CMKGM–La–Al is shown as above.

scholarly journals Benzene Sulfonate Modified ZnCr-LDH and Its Enhanced Adsorption Properties for Anionic Dyes

2021 ◽  
Author(s):  
Jia Lin ◽  
Yude Zhang ◽  
Qian Zhang ◽  
Jinli Shang ◽  
Fuyao Deng
Keyword(s):  
Aqueous Solution ◽  
Active Sites ◽  
Adsorption Process ◽  
Adsorption Behavior ◽  
Maximum Adsorption Capacity ◽  
Benzene Sulfonate ◽  
Dye Molecules ◽  
Anionic Dyes ◽  
One Pot ◽  
High Efficient

Abstract A benzene sulfonate modified hydrotalcite (SO3-LDH) was synthesized by a facile one-pot hydrothermal technique, which can efficiently remove methyl orange (MO), Congo red (CR) and orange II (OII) from aqueous solution. After modified by benzene sulfonate, the microstructure of hydrotalcite changes obviously, from the cellular structure to the stacking structure formed by the face-face contact of hydrotalcite nanosheets, which resulted in much more exchangeable nitrate ions to remain in the interlayer space. The pre-insertion of benzene sulfonate as a pillar expanded the interlayer gallery, which facilitated the pollutant anions (MO, CR and OII) into the interlayer of LDH in the subsequent adsorption process. The maximum adsorption capacity of SO3-LDH for MO, CR and OII was 4200.8 mg/g, 1252.0 mg/g and 1670.6 mg/g respectively, which is approximately 1.86 times, 1.8 times and 2.32 times that of the pristine NO3-LDH, respectively. The removal mechanism of anionic dyes was determined as anion exchange between NO3− ions and dye molecules. The adsorption behavior for MO and OII is multilayer adsorption, while the adsorption behavior for CR is monolayer adsorption. The adsorption process mainly was controlled by the chemical bonding between the dye molecules and adsorbent active sites. The benzene sulfonate modified LDH has a great potential to be used as a high-efficient adsorbent to remove anionic dyes from aqueous solution.

High-efficient removal of U(VI) from aqueous solution by self-assembly pomelo peel/palygorskite composite

2021 ◽  
Author(s):  
Xiaofeng Huang ◽  
Qiulin Deng ◽  
Xingzhang Wang ◽  
Hongquan Deng ◽  
Tinghong Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Self Assembly ◽  
Efficient Removal ◽  
Pomelo Peel ◽  
High Efficient

Effect of Fe–N modification on the properties of biochars and their adsorption behavior on tetracycline removal from aqueous solution

2021 ◽  
Vol 325 ◽  
pp. 124732
Author(s):  
Yanglu Mei ◽  
Jin Xu ◽  
Yin Zhang ◽  
Bin Li ◽  
Shisuo Fan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Behavior

Hydroxyl modified hypercrosslinked polymers: targeting high efficient adsorption separation toward aniline

2021 ◽  
Author(s):  
Zishuai Wei ◽  
Qibin Chen ◽  
Honglai Liu
Keyword(s):  
Aqueous Solution ◽  
Environmental Impact ◽  
High Efficient ◽  
Hypercrosslinked Polymers

The removal of aniline from aqueous solution can have a major environmental impact and hence has attracted increasing attention in last years. In this work, four hypercrosslinked polymers (HCPs) bearing...

Removal of Anionic Metalloid/Metals by PEI-Modified Corynebacterium glutamicum

2013 ◽  
Vol 825 ◽  
pp. 568-571
Author(s):  
Namgyu Kim ◽  
Munsik Park ◽  
Jongmoon Park ◽  
Donghee Park
Keyword(s):  
Aqueous Solution ◽  
Binding Site ◽  
Corynebacterium Glutamicum ◽  
Adsorption Mechanism ◽  
Competitive Inhibition ◽  
Aqueous System ◽  
Reduction Mechanism ◽  
Removal Mechanism ◽  
Sulfate Ion ◽  
Industrial Fermentation

An anionic biosorbent was derived from an industrial fermentation biowate, Corynebacterium glutamicum, by being cross-linked with polyethylenimine (PEI). A fiber form of the biosorbent was used to examine its potentiality of removing anionic metals such as As (V), Cr (VI) and Mn (VII) in aqueous system. As (V) and Cr (VI) were efficiently removed by the biosorbent through anionic adsorption mechanism. Sulfate ion seriously inhibited adsorption of the anionic metals through competitive inhibition with respect to the binding site of the biosorbent. In the case of Mn (VII), its removal mechanism by the biosorbent was not anionic adsorption. Mn (VII) was completely removed in aqueous phase, meanwhile, Mn (II) appeared and increased in proportion to the Mn (VII) depletion. As a result, adsorption coupled reduction was chosen as the mechanism of Mn (VII) removal by the biosorbent. In conclusion, the anionic biosorbent could be used to remove various anionic metals from aqueous solution through anionic adsorption or reduction mechanism.

Adsorption behavior and adsorption mechanism of glyphosate in water by amino-MIL-101(Fe)

2021 ◽  
pp. 110403
Author(s):  
Ruijie Liu ◽  
Yinde Xie ◽  
Kaifei Cui ◽  
Jia Xie ◽  
Yuxia Zhang ◽  
...  
Keyword(s):  
Adsorption Mechanism ◽  
Adsorption Behavior
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