Adsorption Efficiency of Cr(VI) by Ethylene-1,2- Diamine-6-Deoxychitosan

Chethan, P.D.; Vishalakshi, B.

doi:10.1080/01496395.2014.967405

Cited by 9 publications

(2 citation statements)

References 31 publications

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“…On the basis of this result, it can be inferred that the processes of Cu 2+ , Zn 2+ and Pb 2+ adsorption by lignite and MML belong to Langmuir monolayer adsorption, where there is no interaction between the heavy metal ions adsorbed on the surface 20 . Also, R L was found to be less than 1 by analysis, indicating good adsorption of heavy metal ions 21 .The 1/n less than 1 in the Freundlich model also con rms good adsorption conditions 22 . Comparing the parameters of the adsorption isotherms of lignite and MML shows that the correlation coe cient of the Langmuir model for MML is larger, Table 1 Adsorption isotherm constants for the adsorption of heavy metal ion onto different samples: Lignite; MML.…”

Section: Adsorption Isothermmentioning

confidence: 80%

Adsorption Behaviors and Mechanisms of Cu2+, Zn2+ and Pb2+ by Magnetically Modified Lignite

Ruan

Zhang

2021

Preprint

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In order to solve the problems of high content of Cu2+, Zn2+ and Pb2+ in acid mine wastewater (AMD), and limited adsorption capacity of lignite, the lignite was used as raw material to prepare magnetically modified lignite (MML), and adsorption performance of lignite and MML on Cu2+, Zn2+ and Pb2+ was investigated by static beaker experiment and dynamic continuous column experiment. At the same time, the adsorption mechanism was revealed by means of scanning electron microscopy (SEM), X-ray diffractometer (XRD) and Fourier transform infrared spectrometer (FTIR). The results showed that the adsorption processes of lignite and MML on heavy metal ions were more consistent with the Langmuir model, obeying the quasi first-order model and quasi second-order model, respectively. In addition, the intraparticle diffusion model indicated that the adsorption processes were jointly controlled by multiple adsorption stages. The dynamic continuous column experiments showed that the average removal rates of Cu2+, Zn2+ and Pb2+ were 78.00%, 76.97% and 78.65% for lignite and 82.83%, 81.57% and 83.50% for MML, respectively. Compared with lignite, the adsorption effect of MML was better. From SEM, XRD and FTIR tests, it can be seen that the magnetic modification process successfully loads Fe3O4 onto the surface of lignite, making the surface morphology rougher, and the adsorption process of MML on Cu2+, Zn2+ and Pb2+ is related to the O-H stretching vibration of carboxylic acid ions and Fe-O stretching vibration of Fe3O4 particles.

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Section: Adsorption Isothermmentioning

confidence: 80%

Adsorption Behaviors and Mechanisms of Cu2+, Zn2+ and Pb2+ by Magnetically Modified Lignite

Ruan

Zhang

2021

Preprint

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“…The detailed analysis of the parameters of Freundlich isothermal adsorption equation shows that Freundlich isothermal adsorption equation is used to describe the heterogeneity of adsorbent surface and the adsorption strength of adsorbent 1/n=0.41701, 0.1＜1/n＜0.5. The results show that the immobilized particles have strong heterogeneity 22 and the Zn 2+ adsorption process on lignite surface is easy to occur [23][24] .…”

Section: (2)analysis Of Fitting Resultsmentioning

confidence: 96%

Experimental Study on Single Factor, Orthogonal and Characteristics of SRB Particles Fixed by Biologically Activated Lignite

Jiang

Wang

et al. 2021

Preprint

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Aiming at the problems of insufficient supply of carbon source and toxic effect of heavy metal ions in the treatment of acid mine wastewater (AMD) by sulfate reducing bacteria (SRB), immobilized particles were prepared with Rhodopseudomonas spheroides, SRB and lignite as the main raw materials, and the optimal ratio of immobilized particles was determined based on single factor test and orthogonal test. The adsorption experiment of immobilized particles was carried out under the optimal ratio, the reaction kinetic process and adsorption capacity of immobilized particles for different ions were analyzed, and the action mechanism was studied. The results show that lignite not only has good adsorption performance, but also can be used as the carbon source of SRB after degradation by Rhodopseudomonas spheroides, so as to solve the problems of low removal efficiency of AMD by SRB and insufficient supply of carbon source. When the dosage of lignite, Rhodopseudomonas spheroides and SRB is 3%, 10% and 10% respectively, and the particle size of lignite is 200 mesh, the overall treatment effect is the best. The removal rates of SO42-, Zn2+ and Cu2+ are 83.21%, 99.59% and 99.93% respectively, the pH is increased to 7.43, the release of COD is 523 mg/L, and the ORP number is -134 mV. The reduction process of SO42- by immobilized particles conforms to the pseudo first-order kinetics, the isothermal adsorption of Zn2+ more conforms to the Freundlich isothermal adsorption equation, and the adsorption kinetics of Zn2+ more conforms to the pseudo second-order kinetic model.

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Adsorption mechanism of phosphorus on biomass ash modified with lanthanum immobilized by chitosan

Jiang

et al. 2023

Environ Sci Pollut Res

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Adsorption Efficiency of Cr(VI) by Ethylene-1,2- Diamine-6-Deoxychitosan

Cited by 9 publications

References 31 publications

Adsorption Behaviors and Mechanisms of Cu2+, Zn2+ and Pb2+ by Magnetically Modified Lignite

Adsorption Behaviors and Mechanisms of Cu2+, Zn2+ and Pb2+ by Magnetically Modified Lignite

Experimental Study on Single Factor, Orthogonal and Characteristics of SRB Particles Fixed by Biologically Activated Lignite

Adsorption mechanism of phosphorus on biomass ash modified with lanthanum immobilized by chitosan

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