Modification of Cellulosic Fibers and Adsorption of Chromium (VI) Ion from Dilute Aqueous Solution

2014 ◽  
Vol 496-500 ◽  
pp. 183-186
Author(s):  
Zhen Xu ◽  
Wei Liu ◽  
Fan Gong Kong ◽  
Shou Juan Wang ◽  
Hong Lei Chen
Keyword(s):  
Aqueous Solution ◽  
High Efficiency ◽  
Environmental Influence ◽  
Condensation Reaction ◽  
Natural Fibers ◽  
Toluene Diisocyanate ◽  
Cellulosic Fibers ◽  
Chromium Vi ◽  
Grafting Reaction ◽  
High Efficient

The removal of Cr (VI) from aqueous solution is paying more and more attention due to the higher concern of environmental influence of this ion. In this paper, the biodegradable cellulosic fibers were modified with the grafting reaction to introduce the amide groups onto the fibers. In the grafting reaction, the toluene diisocyanate was firstly grafted on the surface of natural fibers, and then the 3-Chloro-2-hydroxypropyltrimethylammonium chloride (HPTMAC), as a high efficiency trapping agent of Cr (VI), was introduced through the condensation reaction. The modified fibers was characterized by infrared spectroscopy (IR) and elemental analysis. The modified fibers were applied to adsorb chromium (VI) ion from aqueous solution. The adsorption capability of the modified fibers was evaluated under different pH, time and temperature. The optimal adsorption conditions were obtained. The results showed that the grafted fibers had high efficient adsorption of chromium (VI) ion.

REMOVAL OF HEAVY METAL Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II) IONS FROM AQUEOUS SOLUTION BY MENTHA PIPERITA EXTRACT

2020 ◽  
pp. 15-20
Author(s):  
Ersin Yucel ◽  
Mine Yucel
Keyword(s):  
Aqueous Solution ◽  
Metal Ions ◽  
High Efficiency ◽  
Correlation Coefficients ◽  
Langmuir Model ◽  
Mentha Piperita ◽  
Freundlich Model ◽  
Biosorption Capacity ◽  
Peppermint Extract ◽  
The Stability

In this study, the usage of the peppermint (Mentha piperita) for extracting the metal ions [Mg (II), Cr (II), Ni (II), Cu (II), Zn (II), Cd (II), Pb (II)] that exist at water was investigated. In order to analyze the stability properties, Langmuir, Freundlich, Temkin and Dubinin-Radushkevich isotherms were used at removing the metal ions and the highest correlation coefficients (R2) were obtained at Langmuir isotherm. Therefore, it is seen that the Langmuir model is more proper than the Freundlich model. However, it was found that the correlation coefficients of removing Ni and Cd is higher at Freundlich model than Langmuir and low at Dubinin-Radushkevich isotherm. It is established that the biosorption amount increase depends on the increase of biosorbent and it can be achieved high efficiency (95%) even with small amount (0.6 mg, peppermint extract) at lead ions. It is also determined that the peppermint extracted that is used at this study shows high biosorption capacity for metal ions and can be used for immobilization of metals from polluted areas.

Breakthrough analysis for hexavalent chromium removal from drinking water in a fixed bed column

2009 ◽  
Vol 9 (6) ◽  
pp. 661-670 ◽  
Author(s):  
S. P. Dubey ◽  
K. Gopal
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Fixed Bed ◽  
Entropy Change ◽  
Spectroscopic Technique ◽  
Fixed Bed Column ◽  
Chromium Vi ◽  
Fixed Bed Adsorption ◽  
Optimal Column ◽  
Eucalyptus Bark

The activated carbon of Eucalyptus globulus was tested for their effectiveness in removing hexavalent chromium from aqueous solution using column experiments. Result revealed that adsorption of chromium(VI) on eucalyptus bark carbon was endothermic in nature. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were found to be 1.39 kJ mol−1 K−1, 1.08 kJ mol−1 and −3.85 kJ mol−1, respectively. Different chromium concentrations were used for the fixed bed adsorption studies. The pre- and post-treated adsorbents were characterized using a FTIR spectroscopic technique. It was concluded that Eucalyptus bark carbon column could be used effectively for removal of hexavalent chromium from aqueous solution at optimal column conditions. This study showed that this biological material is potential adsorbent of Cr(VI) from water.

Recent Advances in Heterostructured Photocatalysts for Degradation of Organic Pollutants.

2020 ◽  
Vol 17 ◽  
Author(s):  
Chen-Jing Sun ◽  
Li-Ping Zhao ◽  
Rui Wang
Keyword(s):  
Organic Pollutants ◽  
High Efficiency ◽  
Separation Efficiency ◽  
Organic Pollution ◽  
Utilization Rate ◽  
Type I ◽  
Human Beings ◽  
Global Challenge ◽  
Global Environmental ◽  
High Efficient

: With the development of industrialization, the global environmental pollution and energy crisis are becoming increasingly serious. Organic pollutants pose a serious health threat to human beings and other organisms. The removal of organic pollutants in environment has become a global challenge. The photocatalytic technology has been widely used in the degradation of organic pollutants with its characteristics of simple process, high efficiency, thorough degradation and no secondary pollution. However, the single photocatalyst represented by TiO2 has disadvantages of low light utilization rate and high recombination rate of photocarriers. Building heterojunction is considered one of the most effective methods to enhance the photocatalytic performance of single photocatalyst, which can improve the separation efficiency of photocarriers and utilization of visible light. The classical heterojunction can be divided into four different cases: type I, typeⅡ, p–n heterojunctions and Z-scheme junction. In this paper, the recent progress in the treatment of organic pollution by heterostructure photocatalysts is summarized and the mechanism of heterostructure photocatalysts for the treatment of organic pollutants is reviewed. It is expected that this paper can deepen the understanding of heterostructure photocatalysts and provide guidance for high efficient photocatalytic degradation of organic pollutants in the future.

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

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...

scholarly journals High efficiency removal of Pb(ii) in aqueous solution by a biochar-supported nanoscale ferrous sulfide composite

RSC Advances ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 953-959
Author(s):  
Chengguang Chen ◽  
Muqing Qiu
Keyword(s):  
Aqueous Solution ◽  
High Efficiency ◽  
Ferrous Sulfide

A biochar-supported nanoscale ferrous sulfide composite was prepared and applied for the treatment of Pb(ii) ions in aqueous solution.

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