Removal of sodium salts and chemical oxygen demand from real reactive dye wastewater by the integrated process of chemical precipitation and extraction

Xu, Daolin; Wang, Ping; Dong, Yuanhua

doi:10.1080/19443994.2015.1010232

Cited by 11 publications

(5 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As an important theme and emergent task of environmental protection, significantly more efforts should be taken to eliminate organic dye pollutants from wastewater. Up to now, researchers have devised various methods for the removal of organic dye pollutants (ODPs) from sewage, including membrane separation, , reverse osmosis, , chemical precipitation, biological oxidation, , photocatalytic degradation, , and physical adsorption. , Among these techniques, solid–liquid adsorption showed advantages of easy operation, high treatment efficiency, and low cost. These advantages made it a particularly promising and favorable method utilized for ODPs removal. , Meanwhile, adsorption has also proved to be an important process of photodegradation removal for ODPs, which is reported to occur generally on the photocatalyst surface. , Therefore, adsorption investigation of surface interaction is critical to evaluate ODPs operation application in wastewater treatment for both adsorbent and photocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Insight into Organic Pollutant Adsorption Characteristics on a g-C₃N₄ Surface by Attenuated Total Reflection Spectroscopy and Molecular Dynamics Simulation

et al. 2021

View full text Add to dashboard Cite

Herein the adsorption characteristics of zwitterionic dye pollutant Rhodamine B (Rh + B − ) on a g-C 3 N 4 surface were investigated by both an attenuated total reflection spectroscopy (ATRS) experiment and a molecular dynamics simulation (MDS). For experimental investigation, g-C 3 N 4 was coated on a silica optical fiber (SOF) surface to fabricate an adsorption film. According to the ATRS response, adsorption thermodynamics and thermodynamics results were in situ obtained and evaluated. The isothermal Langmuir model was used to calculate the adsorption equilibrium constants (K ads ) and adsorption energies (ΔG ads ) for Rh + B − as 27.25 × 10 4 M −1 and −31.01 kJ mol −1 , respectively, which indicated the spontaneous adsorption behavior of Rh + B − at the g-C 3 N 4 surface. Using dynamic Elovich modeling, the rate constants of Rh + B − were found to be k 1 = 0.0063 min −1 and k 2 = 0.0004 min −1 , which indicated two-stage adsorption at the g-C 3 N 4 surface. For theoretical simulation, adsorption configurations and adsorption energies were systematically calculated by a molecular dynamics simulation (MDS) . Rh + B − molecules were inclined to orient in a parallel position at the g-C 3 N 4 surface during low concentration but a perpendicular position at the g-C 3 N 4 surface during high concentration. Combined with experimental and calculation results, this work revealed the microscopic adsorption performance and elucidated the intermolecular interaction between localized interfaces of g-C 3 N 4 and hazardous dye pollutant. We propose an adsorption model to explain the process of surface interaction, which is based on molecular orientation and a force-driven mechanism. Electrostatic attraction and π−π interaction dominated the adsorption interaction with an adsorption energy of ΔG low(ads) = −38.96 kJ mol −1 for low Rh + B − concentration, and electrostatic attraction dominated the adsorption interaction with an adsorption energy of ΔG high(ads) = −25.76 kJ mol −1 for high Rh + B − concentration. This work can provide a fundamental basis for a dye-pollutants removal application by g-C 3 N 4 in both adsorption and photocatalyzation.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Insight into Organic Pollutant Adsorption Characteristics on a g-C₃N₄ Surface by Attenuated Total Reflection Spectroscopy and Molecular Dynamics Simulation

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Various methods including flocculation coagulation, , photocatalytic degradation, , biological oxidation, , physical adsorption, , and chemical precipitation have been developed and applied to remove dyes from wastewater. Among these approaches, semiconductor-based photocatalysis is considered as a highly effective technology for the degradation of organic dyes.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Synergistic Effect of Adsorption–Photocatalysis for the Removal of Organic Dye Pollutants by Cr-Doped ZnO

et al. 2019

View full text Add to dashboard Cite

The adsorption of dye molecules is an important process for the photodegradation removal of dye pollutants. In this work, a semiconductor photocatalyst of Cr-doped ZnO nanorods (Cr–ZnO NRs) was synthesized, and its adsorption–photocatalysis synergy (APS) effect was investigated for anionic methyl orange (MO–) and cationic methylene blue (MB+). The detailed thermodynamic information (including adsorption maximum capacity q max, adsorption equilibrium constant K ads and adsorption efficiency AE %) and dynamic information (including adsorption rate constant k a, degradation rate constant k d and degradation efficiency DE %) were obtained to evaluate the different reaction performances for MO– and MB+. With q max(MB+) = 40.59 mg g–1 > q max(MO–) = 15.95 mg g–1, k a(MB+) = 20.61 min–1 > k a(MO–) = 4.62 min–1, and AE(MB+) = 40% > AE(MO–) = 9%, Cr–ZnO NRs showed much superior adsorption performance for MB+ than MO–. With k d (MB+) = 0.0430 min–1 > k d (MO–) = 0.0014 min–1 and DE(MB+) = 98% > AE(MO–) = 20%, Cr–ZnO NRs also showed much superior photodegradation performance for MB+ than MO–. The APS mechanism of Cr–ZnO NRs is revealed to be multiple π–π interactions and stronger electrostatic attractions dominant for enhanced adsorption of MB+ and higher AE and more photocatalytic active species dominant for enhanced photodegradation of MB+. The APS was furthermore characterized and verified by zeta potential analysis, Fourier transform infrared investigation, and fluorescence imaging. The results indicate that Cr–ZnO NRs are promising adsorbent and photocatalyst candidates favorable for positive MB+ than negative MO–. Such an APS investigation can effectively help to improve the photodegradation treatment performance of photocatalysts for dye pollutant removal.

show abstract

“…Many techniques have been adapted and proposed to deal with the industrial wastewater containing ASAs, such as advanced oxidation technology [3][4][5], biological treatment [6][7][8], extraction [9,10], and adsorption [2,11,12]. Among these methods, adsorption is generally considered an effective process to remove organic pollutants and purify contaminated water due to its simplicity, rapidity, and low cost.…”

Section: Introductionmentioning

confidence: 99%

Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution

Sun

Zheng

et al. 2019

Applied Sciences

View full text Add to dashboard Cite

Adsorption using anion exchange resins is an efficient method for the removal of aromatic sulfonic acids (ASAs) from industrial wastewater. In this study, a series of weak-base anion exchangers (SD1–SD5) were synthesized to investigate the effect of functional group density of resins on the adsorption of ASAs from wastewater containing competitive inorganic anions. p-Toluene sulfonic acid (PTSA) was selected as a target pollutant, and Na2SO4 was chosen as the competitive inorganic salt because of its widespread existence in industrial wastewater. Adsorption performances of these resins were evaluated and compared in terms of selectivity, kinetics, isotherms, regeneration, and dynamic adsorption behavior. Importantly, the PTSA uptake increased with the raising content of functional groups on resins in the absence of Na2SO4; however, in the presence of a high level of Na2SO4 (for example, ≥1%), a decrease in the functional group density could improve the adsorption capacity of resins for PTSA. Moreover, desorption and fixed bed column experiments were conducted in all resins, thereby confirming the effect of functional group density of resins on the PTSA adsorption in actual application. In brief, this research will provide a better understanding for the design and preparation of anion exchangers for the effective removal of ASA from wastewater.

show abstract

Removal of sodium salts and chemical oxygen demand from real reactive dye wastewater by the integrated process of chemical precipitation and extraction

Cited by 11 publications

References 36 publications

Insight into Organic Pollutant Adsorption Characteristics on a g-C₃N₄ Surface by Attenuated Total Reflection Spectroscopy and Molecular Dynamics Simulation

Insight into Organic Pollutant Adsorption Characteristics on a g-C₃N₄ Surface by Attenuated Total Reflection Spectroscopy and Molecular Dynamics Simulation

Insight into the Synergistic Effect of Adsorption–Photocatalysis for the Removal of Organic Dye Pollutants by Cr-Doped ZnO

Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution

Contact Info

Product

Resources

About

Removal of sodium salts and chemical oxygen demand from real reactive dye wastewater by the integrated process of chemical precipitation and extraction

Cited by 11 publications

References 36 publications

Insight into Organic Pollutant Adsorption Characteristics on a g-C3N4 Surface by Attenuated Total Reflection Spectroscopy and Molecular Dynamics Simulation

Insight into Organic Pollutant Adsorption Characteristics on a g-C3N4 Surface by Attenuated Total Reflection Spectroscopy and Molecular Dynamics Simulation

Insight into the Synergistic Effect of Adsorption–Photocatalysis for the Removal of Organic Dye Pollutants by Cr-Doped ZnO

Effect of Functional Group Density of Anion Exchange Resins on Removal of p-Toluene Sulfonic Acid from Aqueous Solution

Contact Info

Product

Resources

About

Insight into Organic Pollutant Adsorption Characteristics on a g-C₃N₄ Surface by Attenuated Total Reflection Spectroscopy and Molecular Dynamics Simulation

Insight into Organic Pollutant Adsorption Characteristics on a g-C₃N₄ Surface by Attenuated Total Reflection Spectroscopy and Molecular Dynamics Simulation