Regeneration of strong acid/strong base mixed-bed resins using ammonium bicarbonate (AB) for a sustainable desalination process

Chandrasekara, N.; Pashley, Richard M.

doi:10.1016/j.desal.2017.01.014

Cited by 12 publications

(5 citation statements)

References 27 publications

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“…From an international view, the world community confronts huge challenges in the field of water supply (Chandrasekara and Pashley 2017). Nowadays, the aquatic environment is globally contaminated by various industrials or human activities.…”

Section: Introductionmentioning

confidence: 99%

Biotransformation of phenol in synthetic wastewater using the functionalized magnetic nano-biocatalyst particles carrying tyrosinase

et al. 2018

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Low conversion efficiency and long-processing time are some of the major problems associated with the use of biocatalysts in industrial processes. In this study, modified magnetic iron oxide nanoparticles bearing tyrosinase (tyrosinase-MNPs) were employed as a magnetic nano-biocatalyst to treat phenol-containing wastewater. Different factors affecting the phenol removal efficiency of the fabricated nano-biocatalyst such as catalyst dosage, pH, temperature, initial phenol concentration, and reusability were investigated. The results proved that the precise dosage of nano-biocatalyst was able to degrade phenol at the wide range of pHs and temperatures. The immobilized tyrosinase showed proper phenol degradation more than 70%, where the substrate with a high concentration of 2500 mg/L was subjected to phenol removal. The nano-biocatalyst was highly efficient and reusable, since it displayed phenol degradation yields of 100% after the third reuse cycle and about 58% after the seventh cycle. Moreover, the immobilized tyrosinase was able to degrade phenol dissolved in real water samples up to 78% after incubation for 60 min. It was also reusable at least seven cycles in the real water sample. The results proved the effectiveness and applicability of the fabricated nano-biocatalyst to treat phenol-containing wastewaters in a shorter time and higher efficiency even at high phenol concentration. The developed nano-biocatalyst can be promising for the micropollutants removal and an alternative for the catalysts used in traditional treatment processes.

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Section: Introductionmentioning

confidence: 99%

Biotransformation of phenol in synthetic wastewater using the functionalized magnetic nano-biocatalyst particles carrying tyrosinase

et al. 2018

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“…These studies highlight the potential of NBCs in diverse bioremediation procedures, and indicate that enzyme technology could advance this area of research. From a global perspective, the global community faces extremely difficult barriers to water supply ( Chandrasekara & Pashley, 2017 ; Dolan et al, 2021 ). Currently, aquatic environments are contaminated worldwide due to a wide variety of industrial and human activities.…”

Section: Applications Of Nanobiocatalystsmentioning

confidence: 99%

Green nanobiocatalysts: enhancing enzyme immobilization for industrial and biomedical applications

Khafaga,

Muteeb,

Elgarawany

et al. 2024

PeerJ

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Nanobiocatalysts (NBCs), which merge enzymes with nanomaterials, provide a potent method for improving enzyme durability, efficiency, and recyclability. This review highlights the use of eco-friendly synthesis methods to create sustainable nanomaterials for enzyme transport. We investigate different methods of immobilization, such as adsorption, ionic and covalent bonding, entrapment, and cross-linking, examining their pros and cons. The decreased environmental impact of green-synthesized nanomaterials from plants, bacteria, and fungi is emphasized. The review exhibits the various uses of NBCs in food industry, biofuel production, and bioremediation, showing how they can enhance effectiveness and eco-friendliness. Furthermore, we explore the potential impact of NBCs in biomedicine. In general, green nanobiocatalysts are a notable progression in enzyme technology, leading to environmentally-friendly and effective biocatalytic methods that have important impacts on industrial and biomedical fields.

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“…This approach is a novel use of complementary functionalities of different resins in a mixed resin bed, because the goal of conventional mixed resin beds is to facilitate the removal of multiple adsorbates instead of to augment the pH-controlled removal of one adsorbate. 40 Utilizing a pK a 9 buffer provides additional advantages for selective TAN ligand exchange, including expanding the upper limit of TAN concentrations toward the most opportune concentrated wastewaters. Resin-mediated pH control also enables the use of mild pH regenerants, which drastically lowers the energy and material costs of recovery because strong acid and base regenerants can predominate environmental impacts.…”

Section: Introductionmentioning

confidence: 99%

“…Solid-phase pH buffering facilitated the fine-tuning of pH, which resulted in high adsorption efficiency due to the favoring of NH 3 (adsorbate species) and low zinc elution due to avoiding phenomena that occur at extreme pH values and TAN concentrations (e.g., metal hydroxide precipitation, carboxylate protonation, excess ammonia ligand exchange). This approach is a novel use of complementary functionalities of different resins in a mixed resin bed, because the goal of conventional mixed resin beds is to facilitate the removal of multiple adsorbates instead of to augment the pH-controlled removal of one adsorbate . Utilizing a p K a 9 buffer provides additional advantages for selective TAN ligand exchange, including expanding the upper limit of TAN concentrations toward the most opportune concentrated wastewaters.…”

Section: Introductionmentioning

confidence: 99%

Resin-Mediated pH Control of Metal-Loaded Ligand Exchangers for Selective Nitrogen Recovery from Wastewaters

Clark

Gilles

Tarpeh

2022

ACS Appl. Mater. Interfaces

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Highly selective separation materials that recover total ammonia nitrogen (i.e., ammonia plus ammonium, or TAN) from wastewaters as a pure product can supplement energy-intensive ammonia production and incentivize pollution mitigation. We recently demonstrated that commercial acrylate cation exchange polymer resins loaded with transition metal cations, or metal-loaded ligand exchangers, can recover TAN from wastewater with high selectivity (TAN/K + equilibrium selectivity of 10.1) via metal−ammine bond formation. However, the TAN adsorption efficiency required further improvement (35%), and the optimal concentration and pH ranges were limited by both low ammonia fractions and an insufficiently strong resin carboxylate−metal bond that caused metal elution. To overcome these deficiencies, we used a zinc− acrylate ligand exchange resin and a tertiary amine acrylic weak base resin (pH buffer resin) together to achieve resin-mediated pH control for optimal adsorption conditions. The high buffer capacity around pH 9 facilitated gains in the adsorbed TAN per ligand resin mass that enhanced the TAN adsorption efficiency to greater than 90%, and constrained zinc elution (below 0.01% up to 1 M TAN) because of decreased ammonia competition for zinc−carboxylate bonds. During TAN recovery, resin-mediated pH buffering facilitated recovery of greater than 99% of adsorbed TAN with 0.2% zinc elution, holding the pH low enough to favor ammonium but high enough to prevent carboxylate protonation. For selective ion separation, solid phase buffers outperform aqueous buffers because the initial solution pH, the buffering capacity, and the ion purity can be independently controlled. Finally, because preserving the resin−zinc bond is crucial to sustained ligand exchange performance, the properties of an ideal ligand resin functional group were investigated to improve the properties beyond those of carboxylate. Ultimately, ligand exchange adsorbents combined with solid pH buffers can advance the selective recovery of nitrogen and potentially other solutes from wastewaters.

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Regeneration of strong acid/strong base mixed-bed resins using ammonium bicarbonate (AB) for a sustainable desalination process

Cited by 12 publications

References 27 publications

Biotransformation of phenol in synthetic wastewater using the functionalized magnetic nano-biocatalyst particles carrying tyrosinase

Biotransformation of phenol in synthetic wastewater using the functionalized magnetic nano-biocatalyst particles carrying tyrosinase

Green nanobiocatalysts: enhancing enzyme immobilization for industrial and biomedical applications

Resin-Mediated pH Control of Metal-Loaded Ligand Exchangers for Selective Nitrogen Recovery from Wastewaters

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