scholarly journals Experimental and theoretical study of a new CDI device for the treatment of desulfurization wastewater

2021 ◽  
Author(s):  
Chang Liu ◽  
Lan Ma ◽  
Yongyi Xu ◽  
Feng Wang ◽  
Yu Tan ◽  
...  
Keyword(s):  
Simulation Software ◽  
Capacitive Deionization ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
Freundlich Model ◽  
Theoretical Support ◽  
Alkaline Conditions ◽  
Comsol Simulation ◽  
Desulfurization Wastewater ◽  
Excellent Stability

Abstract According to the characteristics of desulfurization wastewater, A new capacitive deionization (CDI) device was designed to study the desalination characteristics of desulfurization wastewater in this paper. The experiments investigated the desalination efficiency under different conditions which find that the best desalination efficiency is achieved at a voltage of 1.2V, pH = 11 and 50℃. Besides, the ion adsorption is more favorable under acidic and alkaline conditions. The anion and cation removal performance experiments showed that the order of cation removal is Mg2+༞Na+༞Ca2+༞K+ and the order of anion removal is Cl−༞CO32−༞NO3−༞SO42−༞HCO3−. The mechanism of CDI was studied and analyzed by isothermal adsorption model and COMSOL simulation software. It was found that the Freundlich model and Redlich-Peterson model have a good fit with the experimental results. The experiments show that the CDI device has excellent stability. CDI device was used to treat actual desulfurization wastewater. Furthermore, the study provides theoretical support for the industrial application of CDI for desulfurization wastewater treatment in the future.

scholarly journals Tio2 and carbon nanotubes composites modify capacitive deionization anodes to improve the dechlorination efficiency in desulfurization wastewater

2021 ◽  
Author(s):  
Shuangchen Ma ◽  
Chang Liu ◽  
Yongyi Xu ◽  
Yu Tan ◽  
Dingchang Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Surface Area ◽  
High Specific Capacitance ◽  
High Specific Surface Area ◽  
Capacitive Deionization ◽  
Adsorption Mechanisms ◽  
As Adsorption ◽  
Methyl Pyrrolidone ◽  
Desulfurization Wastewater ◽  
Excellent Stability

Abstract A new capacitive deionization (CDI) technology was used to remove Cl− from desulfurization wastewater. TiO2 and carbon nanotubes (CNTs) were combined with N-methyl pyrrolidone (NMP) to form composites by solvothermal method which is coated onto the CDI anode to improve the dechlorination efficiency (DE). The morphology, surface area, wettability, crystal structure and chemical composition of the TiO2/CNTs were characterized. It showed good hydrophilicity (contact angle: 85.9°), high specific surface area (96.68 m²/g) and high specific capacitance (87.6 F/g). The experimental results illustrated that the best DE was achieved by the composites (60%T/C) under 1.2 V with the maximum electrosorption capacity toward 6.5 mg/g, and the TiO2/CNTs composites have excellent stability. The adsorption kinetics analysis was explored and analyzed. Furthermore, TiO2/CNTs composites exhibit excellent DE in actual desulfurization wastewater. The catalysis and adsorption mechanisms of TiO2/CNTs anode were discussed in detail. This study provides a new direction for the application of TiO2/CNTs composites as adsorption materials of CDI in the Cl− of desulfurization wastewater.

FRACTAL PORE STRUCTURE MODEL AND MULTILAYER FRACTAL ADSORPTION IN SHALE

Fractals ◽  
2014 ◽  
Vol 22 (03) ◽  
pp. 1440010 ◽  
Author(s):  
LIEHUI ZHANG ◽  
JIANCHAO LI ◽  
HONGMING TANG ◽  
JINGJING GUO
Keyword(s):  
Fractal Dimension ◽  
Pore Structure ◽  
Saturated Vapor ◽  
Adsorption Property ◽  
Fractal Theory ◽  
Complex Structure ◽  
Structure Model ◽  
Adsorption Model ◽  
Adsorption Volume ◽  
Isothermal Adsorption

The complex structure and surface property of porous media have significant impact on its accumulation and adsorption capacity. Based on the fractal theory, this paper presents a fractal pore structure model for shales. The effect of different pore structures on fractal dimension is discussed, and the influence of fractal dimension and pore size distribution on porosity is also analyzed. It is shown that the fractal dimension D decreases with the increase of structure parameter q/m for a certain pore diameter ratio, and porosity has positive relationship with fractal dimension. This paper also presents a multilayer fractal adsorption model which takes into account the roughness of adsorption surface by using fractal theory. With the introduction of pseudo-saturated vapor pressure in the supercritical temperature condition, the proposed adsorption model can be applied into a wider range of temperature. Based on the low-pressure nitrogen adsorption and methane isothermal adsorption experiments, the effect of fractal dimension on the adsorption behavior of shales is discussed. Fractal dimension has significant impact on the surface adsorption property and adsorption layer number n. The monolayer saturated adsorption volume Vm increases with the increase of D, while parameter C has the opposite variation trend. Finally, the optimal combination of fractal parameters for describing pore structure of shale samples is selected.

scholarly journals Study and Simulation of a Sensor Based on 2D Photonic Crystals for the Detection of Aromatic Compounds: C6H5I, C6H5F and C6H5Cl

2021 ◽  
Vol 45 (4) ◽  
pp. 335-339
Author(s):  
Mehdi Ghoumazi ◽  
Messaoud Hameurlain
Keyword(s):  
Refractive Index ◽  
Energy Density ◽  
Photonic Crystals ◽  
Ring Resonator ◽  
Organic Materials ◽  
Simulation Software ◽  
Dielectric Constants ◽  
Total Energy Density ◽  
Materials Used ◽  
Comsol Simulation

A new study was presented on a new sensor based on two-dimensional photonic crystals (Phc's) to detect the following three organic materials: iodobenzene (C6H5I), fluorobenzene (C6H5F), chlorobenzene (C6H5Cl). These materials have dielectric constants (εr) equal to 2.623; 2.140; 2.318, respectively. The proposed sensor is a structure made of silicon rods submerged in air plus a ring resonator. The ring resonator is stuck between two horizontal waveguides. At the end of the ends of the structure there are four ports where port 1 and 2 belong to the top guide and port (3) and (4) the bottom one. In order to analyze the behavior of the sensor, a plane wave expansion approach (PWE) and the finite element method (FEM) are applied. Thanks to the MATLAB and COMSOL simulation software, we were able to obtain the following numerical results: the norm of the electric field, the total energy density and this last magnitude according to the refractive indices of the different organic materials used. We could observe variations in energy density for each material. So, this change is due to their refractive index which varies from one material to another. In this study, we have fixed the other parameters like the constant of the lattice "a" and the radius "r" and we are interested in the dielectric constants (εr) or more precisely the refractive index (n), the latter proves that it is one of the important parameters for detection.

Adsorption of Ni(II) by a thermo-sensitive colloid: methylcellulose/calcium alginate beads

2019 ◽  
Vol 68 (7) ◽  
pp. 495-508
Author(s):  
Zhongmin Li ◽  
Wanwan Wu ◽  
Wenyan Jiang ◽  
Guangtao Wei ◽  
Yunshang Li ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Adsorption Process ◽  
Alginate Beads ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
Calcium Alginate Beads ◽  
Lower Temperature ◽  
Kinetics And Isotherms

Abstract The adsorption of Ni(II) by a thermo-sensitive adsorbent of methylcellulose/calcium alginate beads (CAMCBs) was studied using batch adsorption tests to determine the adsorption process and properties, the effects of adsorbent dosage, initial concentration, adsorption time and temperature. The adsorption process was further investigated using kinetics, isotherms and thermodynamic methods. The kinetics and isotherms studies showed the adsorption of Ni(II) on CAMCBs was fitted by the pseudo-second-order kinetic model and Langmuir isothermal adsorption model, respectively. The thermodynamic parameters indicated that the adsorption process was spontaneous and exothermic at lower temperature, and the entropy of the adsorption process was negative. In the study of regeneration, it was confirmed that under the temperature of 60 °C, the desorption agent of CaCl2 with concentration of 3 g·L−1 was more conducive to the desorption of Ni(II) from CAMCBs. Both adsorption capacity and mechanical strength of the used CAMCBs could be basically recovered to the level of fresh CAMCBs after desorption. The prepared CAMCBs had a good property of adsorption of Ni(II) and an excellent regeneration performance.

scholarly journals Adsorption kinetics and isothermal adsorption model of crystal violet on modified red mud

2020 ◽  
Vol 508 ◽  
pp. 012151
Author(s):  
Wei Li ◽  
Shuwen Luo ◽  
Hongfei Ma ◽  
Fanghua Yi ◽  
Zheng Li ◽  
...  
Keyword(s):  
Adsorption Kinetics ◽  
Crystal Violet ◽  
Red Mud ◽  
Adsorption Model ◽  
Isothermal Adsorption

Steam Drive Small "Back" Glyph Pattern Injection-Production Parameters Optimization Research

2013 ◽  
Vol 868 ◽  
pp. 629-632
Author(s):  
Gui Man Liu
Keyword(s):  
History Matching ◽  
Field Work ◽  
Simulation Software ◽  
Oil Field ◽  
Parameters Optimization ◽  
Production Parameters ◽  
Theoretical Support ◽  
Steam Drive ◽  
Well Pattern ◽  
Injection Ratio

Jin 45 block of Liaohe oil field work with inverted nine-spot which has a low production-injection ratio of 3:1, but now it has a phenomenon of energy spillover. On the basis of that, design a small "back" glyph injection-production well pattern, this pattern has a higher production-injection ratio of 9:1. Petrel software makes geologic model, through the CMG numerical simulation software for steam huff and puff history matching, on the small back glyph pattern injection-production parameters optimization makes the 7.5 years of steam drive prediction. The results of the study show that: the little back glyph pattern in variable speed gas injection has the advantage of the high gas oil ratio and low production speed , more suitable for heavy oil steam drive development. It provides theoretical support for the steam drive of Jin 45 block of Liaohe oil field's expanding.

scholarly journals Removal of Uranyl Ion from Wastewater by Magnetic Adsorption Material of Polyaniline Combined with CuFe2O4

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Xinrui Feng ◽  
Shaoshuai Sun ◽  
Ge Cheng ◽  
Lei Shi ◽  
Xiangshan Yang ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Regeneration Ability ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Uranyl Ions ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
High Maximum ◽  
Magnetic Adsorption ◽  
Order Kinetic Equation

The magnetic adsorption material of polyaniline (PANI) with amino functional group combined with CuFe2O4 (CuFe2O4/PANI nanocomposite) has been described in this work. It has been characterized by TEM, XRD, XPS, BET, FTIR, and VSM, respectively. Significantly, it exhibits extremely high maximum adsorption capacity (322.6 mg/g) for removal of uranyl ions from wastewater at a pH of 4. The adsorption process is consistent with the quasisecond-order kinetic equation, and the isotherm and kinetic data are accurately described by the Langmuir isothermal adsorption model. Furthermore, the magnetic CuFe2O4/PANI displays stable adsorption performance for uranyl ions after five cycles of recovery in acid medium, which indicates it possesses good recovery due to its magnetism and excellent regeneration ability for reusability.

scholarly journals Fabrication of PVA/ GO Nanofiber Films by Electrospinning: Application for the Adsorption of Cu2+ and Organic Dyes

2021 ◽  
Author(s):  
Yao He ◽  
huafeng tian ◽  
Aimin Xiang ◽  
Songbai Ma ◽  
Duoyuan Yin ◽  
...  
Keyword(s):  
Active Sites ◽  
Adsorption Process ◽  
Organic Dyes ◽  
Physical Adsorption ◽  
Molecular Layer ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
Nanofiber Film ◽  
Adsorption Kinetics And Isotherm ◽  
Increasing Temperature

Abstract In recent years, the treatment of water pollution has been a challenging and far-reaching topic. In order to improve the adsorption performance of polyvinyl alcohol nanofibers, a new nano-adsorbent graphene oxide was introduced into them in this work. The introduction of GO greatly increases the adsorption of Cu2+, Methylene blue (MB) and Congo Red (CR). The adsorption kinetics and isotherm analysis of the PVA/GO nanofiber film during the adsorption process showed that the adsorption of Cu2+ and MB by PVA/GO nanofiber film was mainly chemical adsorption, while the adsorption of CR was mainly physical adsorption. The adsorption process of PVA/GO nanofiber film on Cu2+ was in line with the Langmuir isothermal adsorption model, that is, single molecular layer adsorption, the distribution of adsorption active sites was relatively uniform, and the increasing temperature was more conducive to the adsorption of Cu2+.

scholarly journals Determination of Phthalate Esters in Beverages and Water Samples by Solid Phase Extraction with Resin Based COFs as Filler

Water ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 3338
Author(s):  
Yunjie Ma ◽  
Xin Gao ◽  
Yang Ruan ◽  
Hang Cui ◽  
Li Zhang ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Phthalate Esters ◽  
Adsorption Behavior ◽  
Phthalate Ester ◽  
Phase Extraction ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
Kinetic Adsorption

Resin based covalent organic framework material was used as filler for solid phase extraction (SPE), and the solid phase extraction effect was compared with that of traditional COF material (TpBD COFs). The enrichment capacity of four phthalate esters (dimethyl phthalate, diethyl phthalate, dibutyl phthalate, dioctyl phthalate) in beverage samples was investigated by SPE. Adsorption experiments showed that the kinetic adsorption behavior of COF materials for phthalate esters (PAEs) was more consistent with the quasi-second-order kinetic adsorption model, and the static adsorption behavior is more in line with the Freundlich isothermal adsorption model. Solid phase extraction experiments proved that the SPE column prepared with two COF materials as adsorbents had good adsorption effects, high recovery (water: 97.99–100.56% and beverage: 97.93–100.23%) and were reusable (50 cycles), which could meet the requirements for trace detection of phthalate ester. It was found that the solid phase extraction effect was better than the four types of commercial SPE columns. The new COF material reduced the cost of monomer use and provided the possibility for its industrial production. Meanwhile, it also provided a new feasible scheme for enriching trace phthalate esters in practical samples.

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