Improved adsorption of Congo red by nanostructured flower-like Fe(II)–Fe(III) hydroxy complex

2018 ◽  
Vol 78 (3) ◽  
pp. 506-514
Author(s):  
Xiaoyan Sun ◽  
Zhongwu Liu ◽  
Zhigang Zheng ◽  
Hongya Yu ◽  
Dechang Zeng
Keyword(s):  
Adsorption Capacity ◽  
Anion Exchange ◽  
Electrostatic Interaction ◽  
Congo Red ◽  
Removal Rate ◽  
Superior Performance ◽  
Facile Synthesis ◽  
Similar Reduction ◽  
Microwave Assisted ◽  
Strong Adsorption

Abstract Amorphous Fe(II)–Fe(III) hydroxy complex with flower-like nanostructure was synthesized by ferric reduction using a microwave-assisted ethylene glycol approach. Here we investigated the correlation between its chemical composition and the removal rate for Congo red (CR) dye. The results showed that the amorphous complex had similar reduction and anion exchange capacities to the green rust. Due to the synergistic effect of attractive electrostatic interaction, anion exchange, ferrous redox and hydrogen bonding, the Fe(II)–Fe(III) hydroxy complex exhibited strong adsorption of CR with an estimated adsorption capacity up to 513 mg g−1. In contrast, the Fe(III) hydroxy complex had an adsorption capacity of 296 mg g−1 because of the predominant mechanism based on the electrostatic interaction. The present study provides a facile synthesis of nanostructured iron hydroxy complex, with superior performance in adsorbing CR.

scholarly journals Synthesis and degradation kinetics of TiO2/GO composites with highly efficient activity for adsorption and photocatalytic degradation of MB

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ruifen Wang ◽  
Kaixuan Shi ◽  
Dong Huang ◽  
Jing Zhang ◽  
Shengli An
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Adsorption Capacity ◽  
Degradation Kinetics ◽  
Removal Rate ◽  
Strong Adsorption ◽  
Degradation Activity ◽  
Kinetics Of ◽  
Stacking Structure ◽  
Synthesis And Degradation

AbstractPoriferous TiO2/GO (denoted as TGO-x%) photocatalysts with ultrathin grapheme oxide (GO) layer were prepared by a hydrothermal method, the adsorption and photocatalytic degradation and its kinetics about Methylene blue(MB) were studied systematically. All the TGO-x% showed improved adsorption and photodegradation performance. TGO-25% had excellent adsorptivity while TGO-20% exhibit the highest visible light photocatalytic degradation activity. The adsorption capacity for TGO-25% was 20.25 mg/gcatalyst along with the k1 was about 0.03393 min·gcatalyst/mg, this enhancement was mainly owing to the strong adsorption capacity of GO and the stacking structure of sheets and nanoparticles. GO sheets prevented the agglomeration of TiO2 particles and TiO2 nanoparticles also prevented the agglomeration of GO sheets, which could provides greater surface area. Besides, the remarkably superior photodegradation activity of TiO2/GO composites is mainly attribute to the strong absorption of visible light and the effective charge separation revealed by the photoluminescence, the total removal rate of MB is 97.5% after 35 min adsorption and 140 min degradation, which is 3.5 times higher than that of TiO2.

Facile synthesis of magnetic hierarchical MgO–MgFe2O4 composites and their adsorption performance towards Congo red

RSC Advances ◽  
2014 ◽  
Vol 4 (53) ◽  
pp. 28119-28125 ◽  
Author(s):  
Xiuying Han ◽  
Peng Tian ◽  
Hongchang Pang ◽  
Qiang Song ◽  
Guiling Ning ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Magnetic Separation ◽  
Congo Red ◽  
Separation Performance ◽  
Facile Synthesis ◽  
Adsorption Performance ◽  
Enhanced Adsorption

MgO–MgFe2O4 composites have been synthesized by a facile method, and they showed enhanced adsorption capacity and good magnetic separation performance.

The Experimental Research on Treatment of Schoolyard Wastewater by Constructed Wetland

2013 ◽  
Vol 316-317 ◽  
pp. 345-348
Author(s):  
Bing Xu ◽  
Hai Yan Pei ◽  
Jia Liu
Keyword(s):  
Adsorption Capacity ◽  
Phragmites Australis ◽  
Experimental Research ◽  
Constructed Wetland ◽  
Removal Rate ◽  
Shandong Province ◽  
Strong Adsorption

The research was conducted at Shandong Architecture University of Jinan, the capital of Shandong province, China. The lab and onsite experiment was carried from March, 1, 2010 to November, 1, 2010. schoolyard wastewater was pumped to constructed wetland tank. Some conclusions were found: the shale ceramsite had a strong adsorption capacity. The rate of adsorption was very quickly;the effext of Phragmites australis was obviously. The removal rate of COD, TP,TN could raise 10,15,30% seperatively;treating schoolyard wastewater by constructed wetland was feasible.

Enhancing the Adsorption Capacity of Hematite by Manganese Doping: Facile Synthesis and its Application in the Removal of Congo Red

2017 ◽  
Vol 38 (10) ◽  
pp. 1155-1162 ◽  
Author(s):  
Huaifen Su ◽  
Xiaoxue Wang ◽  
Yuanwei Sun ◽  
Dan Xu ◽  
Lei Li ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Congo Red ◽  
Facile Synthesis ◽  
Manganese Doping

Microwave-assisted facile synthesis of TEMPO-oxidized cellulose beads with high adsorption capacity for organic dyes

Cellulose ◽  
2017 ◽  
Vol 24 (11) ◽  
pp. 5025-5040 ◽  
Author(s):  
Fengcai Lin ◽  
Yuzhe You ◽  
Xuan Yang ◽  
Xin Jiang ◽  
Qilin Lu ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Organic Dyes ◽  
Oxidized Cellulose ◽  
High Adsorption ◽  
Facile Synthesis ◽  
Microwave Assisted ◽  
High Adsorption Capacity

scholarly journals Adsorption Behavior of Congo Red on Carbon Materials Based of Humic Acid

2021 ◽  
Author(s):  
An Wang ◽  
Boyuan Li ◽  
Yatong Wang ◽  
Xiaoran Sun ◽  
Simeng Bian ◽  
...  
Keyword(s):  
Composite Materials ◽  
Humic Acid ◽  
Adsorption Capacity ◽  
Congo Red ◽  
Removal Rate ◽  
Second Order ◽  
Bet Surface Area ◽  
Order Kinetic ◽  
X Ray ◽  
Pseudo Second Order

Abstract In this study, a carbon composite based on humic acid (CAH) was synthesized by partially carbonizing humic acid by using aluminum sulfate with a mass ratio of 2:3 and a leavening agent oxalic acid with a fixed mass. The morphology and microstructure of the sample are measured by scanning electron microscope (SEM), x-ray diffractometer (XRD), thermal analysis (TG-DSC), Raman spectroscopy (Raman), X-ray photoelectron spectroscopy (XPS) and Fourier Transform infrared spectroscopy (FT-IR) is used to analyze the composition and structure of materials. The BET surface area of CAH is determined to be 149 m²/g. Congo red was used as a model adsorbent for adsorption research. When the dye concentration is 400 mg/L and 10mg of adsorbent powder is used. CAH has the highest dye removal rate of adsorption capacity. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetic data and the Langmuir and Freundlich models were applied to describe the adsorption isotherms. The results showed that the equilibrium adsorption data were found to fit better to the Langmuir adsorption model and the kinetic process of adsorption could be described by the pseudo-second-order model. Compared with humic acid, CAH composite materials can effectively improve the adsorption rate and adsorption capacity of Congo red, and the adsorption capacity is as high as 3986mg/g within 30 minutes. In addition, considering the cost issue, this study selected low-cost humic acid as a carbon source to prepare composite materials, emphasizing the importance of cost.

scholarly journals Stormwater Runoff Treatment Using Pervious Concrete Modified with Various Nanomaterials: A Comprehensive Review

2021 ◽  
Vol 13 (15) ◽  
pp. 8552
Author(s):  
Vahid Alimohammadi ◽  
Mehdi Maghfouri ◽  
Delaram Nourmohammadi ◽  
Pejman Azarsa ◽  
Rishi Gupta ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Compressive Strength ◽  
Adsorption Capacity ◽  
Removal Rate ◽  
Stormwater Runoff ◽  
Infiltration Rate ◽  
Stormwater Treatment ◽  
Adsorption Mechanisms ◽  
Wide Range ◽  
Adsorption Processes

Clean water is a vital need for all living creatures during their lifespan. However, contaminated stormwater is a major issue around the globe. A wide range of contaminants, including heavy metals, organic and inorganic impurities, has been discovered in stormwater. Some commonly utilized methods, such as biological, physical and chemical procedures, have been considered to overcome these issues. However, these current approaches result in moderate to low contaminant removal efficiencies for certain classes of contaminants. Of late, filtration and adsorption processes have become more featured in permeable concretes (PCs) for the treatment of stormwater. As nanoparticles have vast potential and unique characterizations, such as a higher surface area to cure polluted stormwater, employing them to improve permeable concretes’ capabilities in stormwater treatment systems is an effective way to increase filtration and adsorption mechanisms. The present study reviews the removal rate of different stormwater contaminants such as heavy metals, organic and other pollutants using nanoparticle-improved PC. The application of different kinds of nanomaterials in PC as porous media to investigate their influences on the properties of PC, including the permeability rate, compressive strength, adsorption capacity and mix design of such concrete, was also studied. The findings of this review show that different types of nanomaterials improve the removal efficiency, compressive strength and adsorption capacity and decrease the infiltration rate of PC during the stormwater treatment process. With regard to the lack of comprehensive investigation concerning the use of nanomaterials in PC to treat polluted stormwater runoff, this study reviews 242 published articles on the removal rate of different stormwater contaminants by using PC improved with nanoparticles.

scholarly journals Preparation of Zn-MOFs by microwave-assisted ball milling for removal of tetracycline hydrochloride and Congo red from wastewater

2021 ◽  
Vol 10 (1) ◽  
pp. 125-133
Author(s):  
Qinhui Ren ◽  
Fuhua Wei ◽  
Hongliang Chen ◽  
Ding Chen ◽  
Bo Ding
Keyword(s):  
Ball Milling ◽  
Congo Red ◽  
Low Cost ◽  
Metal Organic Framework ◽  
Tetracycline Hydrochloride ◽  
Infrared Spectrometry ◽  
X Ray Diffraction ◽  
Wastewater Purification ◽  
Microwave Assisted ◽  
Metal Organic

Abstract In this study, we prepared Zn-MOFs as an ordinary, low-cost, and efficiency method taking advantage of zinc(ii) acetate monohydrate and 1,3,5-benzenetricarboxylic acid in microwave-assisted ball milling. The Zn-MOFs were measured via scanning electron microscopy, infrared spectrometry, X-ray diffraction, and thermogravimetry. We explored its use as a photocatalyst for the degradation of tetracycline hydrochloride and Congo red from aqueous solutions. The results demonstrate that the kinetic model was appropriate for the removal of organic pollutants. In general, it is feasible, inexpensive, and effective to use metal organic framework (MOF) to treat waste liquid. Therefore, our findings indicate that Zn-MOFs have broad application vista in wastewater purification.

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