Toward Realizing Multifunctionality: Photoactive and Selective Adsorbents for the Removal of Inorganics in Water Treatment.

08:00 EDT 10th April 2019 | BioPortfolio

Summary of "Toward Realizing Multifunctionality: Photoactive and Selective Adsorbents for the Removal of Inorganics in Water Treatment."

Persistent and potentially toxic inorganic oxoanions (e.g., arsenic and selenium) are one class of contaminants of concern in drinking water for which treatment technologies must be improved. Effective removal of these oxoanions is made difficult by the varying adsorption affinity of the different oxidation states, as well as the presence of background ions with similar chemical structure and behavior that strongly compete for adsorption sites, greatly reducing removal efficiencies. Recent studies pointing to the negative health effects of inorganic oxoanion contaminants have resulted or are expected to result in new regulations lowering their allowable maximum concentration level (MCL) in drinking water. While these regulations are intended to protect human and environmental health, they must also allow for balanced economic costs. As such, the MCLs are often set at levels that are not as health protective due to high treatment costs that continue to present a significant challenge for small (500-3300 people) to very small (25-500 people) communities. In this Account, we focus on the development of novel cost-effective, sustainable, and efficient multifunctional and selective adsorbents that offer solutions to the above challenges through two platforms: nanoenabled and transition-metal cross-linked chitosan (TMCC) and crystal facet engineered nanometal oxides (NMO). These complementary platforms offer treatment solutions at different scales and flow rates (e.g., in a point-of-use device versus a small-scale community system). Multifunctional adsorbents combine processes that traditionally require multiple steps offering the potential for reducing treatment time and costs. Development of selective adsorbents can greatly increase removal efficiencies of target contaminants by either promoting their adsorption or hindering adsorption of competitive ions. The following sections describe (1) synthesis of novel nanoenabled waste sourced bioadsorbents; (2) development of multifunctional adsorbents to simultaneously photo-oxidize arsenite and adsorb arsenate; (3) development of a selective adsorbent for removal of arsenate and selenite over phosphate; (4) investigations of the conventional wisdom that increased surface area yields increased oxoanion removal using selenium sorption on nanohematite as a case study; and (5) crystal engineering of nanohematite to promote selenite adsorption. The novel technologies developed through these research efforts can serve as templates for the creation of future adsorbents tailored for use targeting other oxoanion contaminants of interest.


Journal Details

This article was published in the following journal.

Name: Accounts of chemical research
ISSN: 1520-4898


DeepDyve research library

PubMed Articles [6730 Associated PubMed Articles listed on BioPortfolio]

Removal of gaseous elemental mercury by modified diatomite.

Novel adsorbents with low cost and high efficiency that do not produce secondary pollutants are vital for removing gaseous elemental mercury (Hg) from coal-fired power plants. In this study, eight dia...

An overview of chlorophenols as contaminants and their removal from wastewater by adsorption: A review.

In this review article, a significant number of published articles (over three decades) were consulted in order to provide comprehensive literature information about chlorophenols, their sources into ...

Mechanism of Selective Ion Removal in Membrane Capacitive Deionization for Water Softening.

Capacitive deionization (CDI) is an emerging technology selective removal of ions from water. While many studies have reported chemically tailored electrodes for selective ion removal, the selective r...

Efficient removal of cadmium (II) ions from aqueous solution by CoFeO/chitosan and NiFeO/chitosan composites as adsorbents.

Magnetically recoverable chitosan based spinel cobalt and nickel ferrite (CS/CoFeO and CS/NiFeO, respectively) composites were successfully prepared in one step. A series of batch adsorption experimen...

Adsorption removal of cationic dyes from aqueous solutions using ceramic adsorbents prepared from industrial waste coal gangue.

Industrial solid waste coal gangue has huge utilization potential. Low-cost ceramic microsphere adsorbents were prepared from coal gangue by spray drying and sintering method and applied to remove cat...

Clinical Trials [1920 Associated Clinical Trials listed on BioPortfolio]

Selective Dentine Removal in Primary Teeth

Background There is little information regarding the longevity of the restored tooth, considering the health of the pulp-dentine complex, in children who do not sufficiently cooperate with...

Elimination of Albumin-Bound Substances by MARS and Prometheus

This trial compares the efficacy of two artificial liver support systems, MARS (Molecular Adsorbents Recirculating System) and Prometheus (FPSA, Fractionated Plasma Separation and Adsorpti...

Management of Occlusal Dentinal Caries in Deciduous Molars

This study evaluates and compares the efficacy of no caries removal and sealing with a well-adapted and crimped stainless steel crown verses selective caries removal upto soft dentin and u...

Neck Drains for SLNDs

This is a single-blinded randomized controlled trial to compare the outcomes of early closed suction drain removal versus output volume-based drain removal after selective lateral neck dis...

PDT With Metvix 160 mg/g Cream Versus PDT With Placebo Cream in Patients With Primary Nodular Basal Call Carcinoma

Photodynamic therapy (PDT) is the selective destruction of abnormal cells through light activation of a photosensitiser in the presence of oxygen. These cells accumulate more photosensitis...

Medical and Biotech [MESH] Definitions

Removal of toxins or metabolites from the circulation by the passing of blood, within a suitable extracorporeal circuit, over semipermeable microcapsules containing adsorbents (e.g., activated charcoal) or enzymes, other enzyme preparations (e.g., gel-entrapped microsomes, membrane-free enzymes bound to artificial carriers), or other adsorbents (e.g., various resins, albumin-conjugated agarose).

The process by which the nature and meaning of tactile stimuli are recognized and interpreted by the brain, such as realizing the characteristics or name of an object being touched.

A naturally occurring furocoumarin compound found in several species of plants, including Psoralea corylifolia. It is a photoactive substance that forms DNA ADDUCTS in the presence of ultraviolet A irradiation.

Genetic defects in the selective or non-selective transport functions of the KIDNEY TUBULES.

Chromatography on thin layers of adsorbents rather than in columns. The adsorbent can be alumina, silica gel, silicates, charcoals, or cellulose. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)

Quick Search


DeepDyve research library

Relevant Topic

Complementary and Alternative Medicine
Alternative medicine are whole medical systems that did not fit with conventional medicine as they have completely different philosophies and ideas on the causes of disease, methods of diagnosis and approaches to treatment. Although often overlapping, co...

Searches Linking to this Article