Synthesis of covalent organic frameworks via Kabachnik-Fields reaction for water treatment

Detection, detoxification, and removal of multiply heavy metal ions using a recyclable probe enabled by click and declick chemistry

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The presence of heavy metals in the industrial effluents has recently been a challenging issue for human health. Efficient removal of heavy metal ions from environment is one of the most important issues from biological and environmental point of view, and many studies have been devoted to investigate the environmental behavior of nanoscale zerovalent iron (NZVI) for the removal of toxic heavy metal ions, present both in the surface and underground wastewater. The aim of this review is to show the excellent removal capacity and environmental remediation of NZVI-based materials for various heavy metal ions. A new look on NZVI-based materials (e.g., modified or matrix-supported NZVI materials) and possible interaction mechanism (e.g., adsorption, reduction and oxidation) and the latest environmental application. The effects of various environmental conditions (e.g., pH, temperature, coexisting oxy-anions and cations) and potential problems for the removal of heavy metal ions on NZVI-based materials with the DFT theoretical calculations and EXAFS technology are discussed. Research shows that NZVI-based materials have satisfactory removal capacities for heavy metal ions and play an important role in the environmental pollution cleanup. Possible improvement of NZVI-based materials and potential areas for future applications in environment remediation are also proposed.

Removal of heavy metal ions from dilute aqueous solutions by polymer–surfactant aggregates: A novel effluent treatment process

A one‐pot biosynthesis of an aerogel composite based on attapulgite clay/bacterial cellulose to remove Pb²⁺ ion

Recent advances of nanocellulose as biobased adsorbent for heavy metal ions removal: A sustainable approach integrating with waste management

UiO series of metal-organic frameworks composites as advanced sorbents for the removal of heavy metal ions: Synthesis, applications and adsorption mechanism

A novel cationic polyelectrolyte microsphere for ultrafast and ultra-efficient removal of heavy metal ions and dyes

Heavy metal ions removal from metal plating wastewater using electrocoagulation: Kinetic study and process performance

Nowadays, heavy metal pollution has become a serious problem. Toxic heavy metal ions can result in extreme damage to the environment and human society. Under that situation, methods that can remove the heavy metal ions in water have been required. Graphene technology can be widely applied to the removal of heavy metal ions. This article will explain the preparation of graphene oxide and reduced graphene oxide and the efficiency and influence factors of the method applied in water treatment. The method can remove many kinds of mainly occurring toxic heavy metal ions with very high efficiency. Also, large-scale production of graphene oxide can be achieved. The removal of heavy metal ions in water by graphene technology can be a practical method in the water treatment field.

The pollution of toxic heavy metals is becoming an increasingly important issue in environmental remediation because these metals are harmful to the ecological environment and human health. Highly efficient selective removal of heavy metal ions is a huge challenge for wastewater purification. Here, highly efficient selective capacitive removal (SCR) of heavy metal ions from complex wastewater over Lewis base sites of S-doped Fe-N-C cathodes was originally performed via an electro-adsorption process. The SCR efficiency of heavy metal ions can reach 99% in a binary mixed solution [NaCl (100 ppm) and metal nitrate (10 ppm)]. Even the SCR efficiency of heavy metal ions in a mixed solution containing NaCl (100 ppm) and multicomponent metal nitrates (10 ppm for each) can approach 99%. Meanwhile, the electrode also demonstrated excellent cycle performance. It has been demonstrated that the doping of S can not only enhance the activity of Fe-N sites and improve the removal ability of heavy metal ions but also combine with heavy metal ions by forming covalent bonds of S- clusters on Lewis bases. This work demonstrates a prospective way for the selective removal of heavy metal ions in wastewater.

Water pollution is a foremost problem across the world that endangers the survival and development of man and society. As a result of this menace, the effective and efficient removal of heavy metal ions from water has become a serious concern. Metal– organic frameworks (MOFs) have gained attention as promising materials for liquid-phase adsorptive removal of heavy metal ions. Properties such as large surface area, high adsorption capacity, tunable porosity, hierarchical structure and recyclability give MOFs an edge over conventional adsorbents. In this article, recent advances in the removal of toxic heavy metal ions from water by MOFs are highlighted.

Hybrid method integrating adsorption and chemical precipitation of heavy metal ions on polymeric fiber surfaces for highly efficient water purification

In the recent days, control of water contamination and treatment of wastewater is a challenging task throughout the globe because of their impact on human health. The most commonly employed method for the removal of organic pollutants especially toxic heavy metal ions from water/wastewater is adsorption using an adsorbent. There are various types of adsorbents available ranging from synthetic polymers like chelating resins, ion-exchange resins, polystyrene, and sulfonate resins. However, high cost and regeneration difficulties are associated with the use of these synthetic polymer adsorbents. In view of the above difficulties, researchers are focusing on the development of low-cost adsorbents from naturally available green biopolymers like polysaccharides. Cellulose is one among the most frequently used green polysaccharide to prepare various types of functional adsorbent materials at low cost. Even though, cellulose alone could not give a satisfactory performance on the adsorption or chelation of heavy metal ions from water/wastewater solution. To improve the adsorption capacity and achieve easy separation of cellulose-based green adsorbents, the magnetization of the adsorbent is a significant and efficient route. Magnetic adsorbent materials provide excellent water purification without any contaminants and also have the ability to treat large quantities of water/wastewater within a short span of time. Often, iron oxide nanoparticles (Fe2O3/Fe3O4) had been utilized for environmental remediation because of their superior advantages such as large surface area, biocompatibility, less energy requirement, low toxicity, and better separation ability. This chapter will provide a broader perspective of magnetic cellulose green nanocomposites and their use as an adsorbent for the removal of toxic heavy metal ions from water/wastewater.

Heavy metals in water have always remained a point of concern for the environmental scientists due to their non biodegradability and toxicity. Adsorption and membrane filtration are the most widely studied and applied processes for the treatment of water. Activated carbons have frequently been used for the removal of heavy metals from water by the process of adsorption. With the development of nanotechnology, nanomaterials are used as the adsorbents in water treatment and have proved effective for the removal of heavy and toxic metals from water. nanocarbon materials, nanometal particles and polymer supported nanoparticles are widely used. A new adsorbent comprising of graphite coated with nanonickel particles was prepared, characterized and used for the removal of heavy and toxic metals from water. nanomaterial was characterized using ICP-AES, FTIR, XRD, and SEM. It was used for the removal of cadmium and copper from water. Kinetics and thermodynamics of adsorption of cadmium and copper on both the materials was investigated and compared. Adsorption isotherm of Langmuir, Freundlich and Dubinin-Radushkevich were also applied to the adsorption data for the adsorption and removal of cadmium and copper. Effect of pH was also studied and it was found that nanomaterial was very effective for the removal of Cd and Cu from acidic solutions. Effect of different acids at different concentration was studied and it was found that nanomaterial remained stable for adsorption while carbon alone deteriorated. Results indicate that developed nanomaterial is a very effective adsorbent for the removal of heavy and toxic metals from water and wastewater.