N-doped carbon xerogels prepared by ammonia assisted pyrolysis: Surface characterisation, thermal properties and adsorption ability for heavy metal ions

2014 ◽  
Vol 109 ◽  
pp. 266-271 ◽  
Author(s):  
Petra Veselá ◽  
Václav Slovák
Keyword(s):  
Heavy Metal ◽  
Thermal Properties ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Surface Characterisation ◽  
Adsorption Ability ◽  
Carbon Xerogels

scholarly journals Simultaneous Adsorption of Cation and Anion by Thermosensitive Hydrogels

2021 ◽  
Vol 333 ◽  
pp. 11007
Author(s):  
Toni Suharto ◽  
Takehiko Goto ◽  
Satoshi Nakai
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Ability ◽  
Hydrophobic Moiety ◽  
Potential Capacity ◽  
Temperature Swing ◽  
Thermosensitive Hydrogels ◽  
Adsorption Desorption ◽  
Desorption Cycle

Simultaneous usage of cationic and anionic thermosensitive hydrogels was shown to positively contribute to adsorption of heavy metal ions. The potential capacity for recovering heavy metal ions from an aqueous solution was enhanced by incorporating relatively hydrophobic moiety to the hydrogels, which was ascribed to the increase in the desorption on elevating the temperature over the lower critical swelling temperature (LCST). N-tert-butylacrilamide was added into the hydrogels to increase its desorption potential. The addition of N-tert-butylacrylamide does not significantly affect hydrogels’ adsorption ability. Moreover, the adsorption-desorption cycle was not diminished by repeating the temperature swing above the critical temperature at which the volume phase transition was induced.

Study of Heavy Metal Ions Mn(II), Zn(II), Fe(II), Ni(II), Cu(II), and Co(II) Adsorption Using MFe2O4 (M=Co2+, Mg2+, Zn2+, Fe2+, Mn2+, and Ni2+) Magnetic Nanoparticles as Adsorbent

2017 ◽  
Vol 901 ◽  
pp. 142-148 ◽  
Author(s):  
Wahyu Waskito Aji ◽  
Edi Suharyadi
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Ferrite Nanoparticles ◽  
Adsorption Ability ◽  
Desorption Process ◽  
Adsorption And Desorption ◽  
Ion Removal ◽  
Heavy Metal Ions Removal

Removal of heavy metal ions (Co2+, Cu2+, Zn2+, Fe2+, Mn2+, and Ni2+) from artificial wastewater has been successfully perfomed by adsorption process using magnetic ferrite (MFe2O4; M=Co2+, Mg2+, Zn2+, Fe2+, Mn2+, and Ni2+) nanoparticles. Ferrite nanoparticles were synthesized using coprecipitation method and used as absorbent in heavy metal ions removal with concentration of 5 g/L and 10 g/L. The adsorption and desorption ability of each ferrite nanoparticles, the effect of heavy metal ion in adsorption and desorption process, and the endurance of ferrite nanoparticles were investigated using atomic absorption spectroscopy (AAS). The removal process has been conducted for wastewater at pH 7.It showed the presence of heavy metal precipitate in solution. The result shows that MgFe2O4 has the highest adsorption ability than other ferrite and MnFe2O4 is the lowest. Desorption ability of all ferrites is high except for Fe ion removal. Desorption of Fe ion shows very low result which might due to FeO bond from Fe ion reaction in acid solution. The endurance of MnFe2O4 and Fe3O4 as adsorbent after repeated adsorption and desorption process is up to 4 times and more than 6 times. The MnFe2O4 nanoparticles show a stability in adsorption ability after 4 times repetition adsorption and desorption process.

scholarly journals Biosorption of copper(II) and chromium(VI) by modified tea fungus

2012 ◽  
pp. 335-342 ◽  
Author(s):  
Marina Sciban ◽  
Jelena Prodanovic ◽  
Radojka Razmovski
Keyword(s):  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Acid Modification ◽  
Adsorption Ability ◽  
Batch Mode ◽  
Chromium Vi ◽  
Adsorption Capacities ◽  
Tea Fungus

The tea fungus was found to have good adsorption capacities for heavy metal ions. In this work it was treated with HCl or NaOH at 20?C or 100?C, with the aim to improve its adsorption ability. The sorption of Cu(II) and Cr(VI) ions from aqueous solutions by raw and treated tea fungus was investigated in the batch mode. The largest quantity of adsorbed Cu(II), of about 55 mg/g, was achieved by tea fungus modified with NaOH at 100?C. For Cr(VI), the largest quantity of adsorbed anions, of about 58 mg/g, was achieved by the adsorbent modified with NaOH at 20?C. It was shown that acid modification of tea fungus biomass was not effective.

Study on the Tolerance and Adsorption of Five Heavy Metal Ions by a Radiation-Resistant Acinetobacter sp.

2013 ◽  
Vol 641-642 ◽  
pp. 183-188
Author(s):  
Jing Zhu ◽  
Yu Qing Xie ◽  
Su Qin Song ◽  
Zhi Dong Zhang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Gene Sequence ◽  
Adsorption Ability ◽  
16S Rdna Gene ◽  
Gene Sequence Analysis ◽  
Biolog System ◽  
Radiation Resistant ◽  
Maximum Tolerance

To investigate the tolerance and adsorption of five heavy metal ions by radiation-resistant microbes, a radiation-resistant strain NO.9 was identified according to 16S rDNA gene sequence analysis and Biolog system, and the tolerance and adsorption to five heavy metal ions was analysed. The results showed that it had a maximum tolerance 2200mg/L to Pb2+, and it had adsorption ability to Pb2+、Cu2+、Hg2+、Zn2+ and Co2+under the situation as followes: 0.1g the amount of cells, at pH 6.0, 20°C and adsorbed for 40 min. it reached a maximum adsorption 98.9% to Pb2+, and the amount of adsorption was 39.56mg/g. It indicated the strain NO.9 had a strong tolerance and absorption to Pb2+. This assay laid a theoretical basis and technological foundation for further study of the radiation-resistant microorganisms in the heavy metal pollution.

Adsorption of Acid Modified Distillers' Grains for Heavy Metal Ions Pb(II) and Cr(III)

2012 ◽  
Vol 518-523 ◽  
pp. 647-650
Author(s):  
Xiao Yan Lin ◽  
Juan Feng ◽  
Yan Chen ◽  
Xue Gang Luo ◽  
Jia Quan Rao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Nitric Acid ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Spectroscopic Analysis ◽  
Distillers Grains ◽  
Adsorption Ability ◽  
Sem Images ◽  
Simple Modification ◽  
Adsorption Capacities

Modification of distillers' grains by hydrochloric acid, phosphoric acid, sulfuric acid and nitric acid, respectively, was carried out in order to enhance their adsorption capacities of heavy metal ions. Fourier transform infrared (FTIR) spectroscopic analysis reveals modified distillers' grains have rich hydroxyl and amides. SEM images of distillers' grains' surface show that modified distillers' grains particles have larger surface area and loose structure feature than the raw distillers' grains (RDG). Modified distillers' grains by nitric acid exhibited higher adsorption capacities for Pb(II) and Cr(III) than RDG. The adsorption capacities of nitric acid treated distillers' grains and RDG for Pb(II) were 20.35 and 15.69 mg g−1, respectively. A simple modification of distillers' grains with nitric acid has improved adsorption ability of distillers' grains particles for heavy metal ions.

N-doped carbon xerogels as adsorbents for the removal of heavy metal ions from aqueous solution

RSC Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 7182-7191 ◽  
Author(s):  
Bin Yang ◽  
Chengxiang Yu ◽  
Qingni Yu ◽  
Xingwang Zhang ◽  
Zhongjian Li ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Capacity ◽  
Heavy Metal Ions ◽  
Textural Property ◽  
Carbon Xerogel ◽  
Carbon Xerogels ◽  
Cu Ions

The adsorption capacity for Pb, Zn and Cu ions in aqueous solution can be significantly improved by the introduction of N into the carbon xerogel (CX) matrix in the basis of the extraordinary textural property.

Porous CS monoliths and their adsorption ability for heavy metal ions

2011 ◽  
Vol 188 (1-3) ◽  
pp. 148-155 ◽  
Author(s):  
Fangqiang Xu ◽  
Nana Zhang ◽  
Ying Long ◽  
Youmiao Si ◽  
Yu Liu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Adsorption Ability

scholarly journals Properties of Zwitterionic Sulfobetaine Gels Containing Different Numbers of Methylene Units

2021 ◽  
Vol 333 ◽  
pp. 01002
Author(s):  
Eva Oktavia Ningrum ◽  
Shuji Sakohara ◽  
Takehiko Gotoh ◽  
Suprapto ◽  
Nurlaili Humaidah
Keyword(s):  
Heavy Metal ◽  
Free Radical ◽  
Metal Ions ◽  
Radical Polymerization ◽  
Salt Solution ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Heavy Metal Ion ◽  
Adsorption Ability ◽  
Swelling Degree

The present research was performed aiming to develop gel with the characteristic of reversible thermosensitive in adsorbing heavy metal ions from its solution. There were three gels used in this study to adsorb heavy metal ion from salt solution provided Zn(NO3)2; copolymer gel consisting of zwitterionic betaine N,N-dimethyl(acrylamidopropyl)ammonium propane sulfonate (DMAAPS), N,N-dimethyl(acrylamidopropyl)ammonium butane sulfonate (DMAABS), and DMAAPS copolymerized with thermosensitive N-isopropylacrylamide (NIPAM) gels. The aforementioned gels were employed to examine its ability in adsorbing and swelling after being synthesized through free radical polymerization before being affected by methylene spacer number, copolymerization, and temperature given. This research found that as the temperature increases, the ability of the gel in adsorbing the ions decreases. In the case of DMAAPS and DMAABS gel, the swelling degree value increases when the temperature also increases. Meanwhile, sulfobetaine which has larger spacer has higher adsorption ability but not with its swelling degree. In spite of having more spacer than DMAAPS, DMAABS found to have the smallest swelling degree value. In addition, NIPAM-co-DMAAPS was found to have both the highest adsorption ability and swelling degree value. Even though copolymer has less amount of sulfobetaine than DMAAPS and DMAABS gels’, the copolymer gel was found to have higher ability of adsorption as many as ten times of other gels.

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