FTIR, Raman, and XPS analysis during phosphate, nitrate and Cr(VI) removal by amine cross-linking biosorbent

Ren, Zhongfei; Xu, Xing; Wang, Xi; Song, Wen; Zhang, Li; Wang, Hantao

doi:10.1016/j.jcis.2016.01.079

Cited by 258 publications

(100 citation statements)

References 48 publications

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“…Soybean was modified with calcium chloride and hydrochloric acid and by calcination, and results confirmed that the mechanism of nitrate adsorption was mainly ion exchange [29]. Nitrate was adsorbed by modified biochar (amine-cross-linked reaction that amine group played the main role in nitrate uptake) depending on the electrostatic attraction mechanism [28,30]. In addition, nitrate was adsorbed by magnetic multiwalled carbon nanotubes depending on the magnetic reaction to the desired separation [26].…”

Section: Introductionmentioning

confidence: 73%

“…After the ZnCl 2 modification, pH pzc of modified GAC had a slight increase to 2.56. is suggested that ZnCl 2 loaded on the surface of activated carbon increased positive charge on activated carbon surface. After adsorption, zeta potentials had an apparent decrease at the pH of 5.3∼12, this illustrated that nitrate ions had been adsorbed on the surface of ZnCl 2 -modified CGAC, and the adsorption mechanism of ZnCl 2 -modified CGAC for nitrate was based on electrostatic attraction [28]. Figure 5 shows the Raman spectra of ZnCl 2 -modified CGAC, pure KNO 3 , and nitrate-loaded …”

Section: Zeta Potentialsmentioning

confidence: 99%

“…where V total is the effluent volume at equilibrium, Q is the volumetric flow rate (ml·min ), and t total is the total flow time [28,31].…”

Section: Column Studiesmentioning

confidence: 99%

“…is indicated that the ZnCl 2 had adhered to the surface of the CGAC and the result was confirmed by the SEM analysis as shown in Figure 3. It had been proved that activated carbon with large amounts of pore structures was inefficient for adsorption capacity [4,28,39]. As a result, micropore adsorption was absent for the potential nitrate adsorption by activated carbon [28].…”

Section: Bet Analysismentioning

confidence: 99%

“…In addition, studies showed the nitrate adsorption due to the different mechanisms [26][27][28][29][30]. e mechanism of nitrate adsorption by magnetic amine-cross-linked biopolymer includes electrostatic attraction, ion exchange, and surface complex formation [27].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Nitrate onto ZnCl₂‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics

Liu

Wang

2018

Advances in Materials Science and Engineering

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Coconut granular activated carbon (CGAC) was modified by impregnating with ZnCl 2 solution to remove nitrate from aqueous solutions. Sorption isotherm and kinetic studies were carried out in a series of batch experiments. Nitrate adsorption of both ZnCl 2 -modified CGAC and CGAC fitted the Langmuir and Freundlich models. Batch adsorption isotherms indicated that the maximum adsorption capacities of ZnCl 2 -modified CGAC and CGAC were calculated as 14.01 mgN·g −1 and 0.28 mgN·g −1 , respectively. e kinetic data obtained from batch experiments were well described by pseudo-second-order model. e column study was used to analyze the dynamic adsorption process. e highest bed adsorption capacity of 1.76 mgN·g −1 was obtained by 50 mgN·L −1 inlet nitrate concentration, 20 g adsorbents, and 10 ml·min −1 flow rate. e dynamic adsorption data were fitted well to the omas and Yoon-Nelson models with coefficients of correlation R 2 > 0.834 at different conditions. Surface characteristics and pore structures of CGAC and ZnCl 2 -modified CGAC were performed by SEM and EDAX and BET and indicated that ZnCl 2 had adhered to the surface of GAC after modified. Zeta potential, Raman spectra, and FTIR suggested the electrostatic attraction between the nitrate ions and positive charge. e results revealed that the mechanism of adsorption nitrate mainly depended on electrostatic attraction almost without any chemical interactions.

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Section: Introductionmentioning

confidence: 73%

Section: Zeta Potentialsmentioning

confidence: 99%

“…where V total is the effluent volume at equilibrium, Q is the volumetric flow rate (ml·min ), and t total is the total flow time [28,31].…”

Section: Column Studiesmentioning

confidence: 99%

Section: Bet Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Adsorption of Nitrate onto ZnCl₂‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics

Liu

Wang

2018

Advances in Materials Science and Engineering

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Deep Separation Between In(III) and Fe(III) Ions by Regulating the Lewis Basicity of Adsorption Sites on Electrospun Fibers

Li,

Zhang,

et al. 2023

Adv Funct Materials

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The deep separation between In(III) and Fe(III) ions is considered as an important technological challenge in the engineering fields. The In(III) ions are closer to the soft acid in terms of Lewis acidity due to the smaller polarizability and greater deformability than the Fe(III) ions, which facilitates the possibility of separating them. Herein, the Lewis basicity of the N‐containing adsorption sites is regulated by the fluorine‐containing group to better match with the In(III) ions rather than Fe(III) ions, causing a significant discrepancy in the binding of the adsorption sites to them. Moreover, targeted programmed desorption techniques based on the potential energy differences of the adsorption sites can achieve the deep separation of In(III) and Fe(III) ions, and reach an exceptional concentration of 20.7 mmol L−1 for In(III) ions in the initial desorption solution with extremely high mass ratio (mIn/mFe = 151.7). This work provides a novel technique for in‐depth separation of In(III) and Fe(III) ions from mixed systems, and a new strategy for separating metal ions with similar or close properties.

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Enhancing the Electrical Conductivity and Long‐Term Stability of PEDOT:PSS Electrodes through Sequential Treatment with Nitric Acid and Cesium Chloride

Adilbekova,

Scaccabarozzi,

Faber

et al. 2024

Advanced Materials

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Solution‐processable poly(3,4‐ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is an important polymeric conductor used extensively in organic flexible, wearable, and stretchable optoelectronics. However, further enhancing its conductivity and long‐term stability while maintaining its superb mechanical properties remains challenging. Here, a novel post‐treatment approach to enhance the electrical properties and stability of sub‐20‐nm‐thin PEDOT:PSS films processed from solution is introduced. The approach involves a sequential post‐treatment with HNO3 and CsCl, resulting in a remarkable enhancement of the electrical conductivity of PEDOT:PSS films to over 5500 S cm−1, along with improved carrier mobility. The post‐treated films exhibit remarkable air stability, retaining over 85% of their initial conductivity even after 270 days of storage. Various characterization techniques, including X‐ray photoelectron spectroscopy, atomic force microscopy, Raman spectroscopy, Hall effect measurements, and grazing incidence wide angle X‐ray scattering, coupled with density functional theory calculations, provide insights into the structural changes and interactions responsible for these improvements. To demonstrate the potential for practical applications, the ultrathin PEDOT:PSS films are connected to an inorganic light‐emitting diode with a battery, showcasing their suitability as transparent electrodes. This work presents a promising approach for enhancing the electrical conductivity of PEDOT:PSS while offering a comprehensive understanding of the underlying mechanisms that can guide further advances.

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FTIR, Raman, and XPS analysis during phosphate, nitrate and Cr(VI) removal by amine cross-linking biosorbent

Cited by 258 publications

References 48 publications

Adsorption of Nitrate onto ZnCl₂‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics

Adsorption of Nitrate onto ZnCl₂‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics

Deep Separation Between In(III) and Fe(III) Ions by Regulating the Lewis Basicity of Adsorption Sites on Electrospun Fibers

Enhancing the Electrical Conductivity and Long‐Term Stability of PEDOT:PSS Electrodes through Sequential Treatment with Nitric Acid and Cesium Chloride

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FTIR, Raman, and XPS analysis during phosphate, nitrate and Cr(VI) removal by amine cross-linking biosorbent

Cited by 258 publications

References 48 publications

Adsorption of Nitrate onto ZnCl2‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics

Adsorption of Nitrate onto ZnCl2‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics

Deep Separation Between In(III) and Fe(III) Ions by Regulating the Lewis Basicity of Adsorption Sites on Electrospun Fibers

Enhancing the Electrical Conductivity and Long‐Term Stability of PEDOT:PSS Electrodes through Sequential Treatment with Nitric Acid and Cesium Chloride

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Product

Resources

About

Adsorption of Nitrate onto ZnCl₂‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics

Adsorption of Nitrate onto ZnCl₂‐Modified Coconut Granular Activated Carbon: Kinetics, Characteristics, and Adsorption Dynamics