An official website of the United States government
Abstract There is a strong impetus to establish a circular phosphorus economy by securing internally renewable phosphate (Pi) resources for use as agricultural fertilizers. Reversible Piadsorption technologies such as ion exchange can remove and recover Pifrom water/wastewater for reuse. However, existing reversible adsorbents cannot effectively discriminate against arsenate (As(V)) due to the similarity between As(V) and Pichemical structure. If As(V) is co‐recovered with Pi, the value of the recovered products for agricultural reuse is low. The objective of this study was to construct an immobilized phosphate‐binding protein (PBP)‐based Piremoval and recovery system and analyze its selectivity for Piadsorption in the presence of As(V). A range of conditions was tested, including independent, sequential, and simultaneous exposure of the two oxyanions to immobilized PBP (PBP resin). The purity of the recovered Piproduct was assessed after inducing controlled desorption of the adsorbed oxyanions at high pH (pH 12.5). Piconstituted more than 97% of the adsorbed oxyanions in the recovered product, even when As(V) was initially present at twofold higher concentrations than Pi. Therefore, PBP resin has potential to selectively remove Pi, as well as release high‐purity Pifree of As(V) contamination suitable for subsequent agricultural reuse. Practitioner pointsExisting reversible phosphate (Pi) adsorbents cannot effectively discriminate against arsenate (As(V)) due to the similarity in their chemical structure.Co‐recovery of As(V) with Pican reduce the recovered product's reuse as a fertilizer.An immobilized phosphate‐binding protein (PBP)‐based system can be highly selective for Pieven in the presence of As(V).Piconstituted more than 97% of the recovered product, even when As(V) was present at 2‐fold higher concentrations than Pi.Immobilized PBP offers advantages over existing Piadsorbents by providing high‐purity Piproducts free of As(V) contamination for reuse.
more »
« less
This content will become publicly available on March 25, 2026
Interface phenomena and emerging functionalities in ferroelectric oxide based heterostructures
Ferroelectric oxide-based heterostructures can be utilized to design interfacial phenomena mediated by charge, lattice, and polar symmetry, as well as developing novel energy-efficient electronics and nanophotonics with programmable functionalities.
more »
« less
- PAR ID:
- 10617093
- Publisher / Repository:
- Royal Society of Chemistry
- Date Published:
- Journal Name:
- Chemical Communications
- Volume:
- 61
- Issue:
- 26
- ISSN:
- 1359-7345
- Page Range / eLocation ID:
- 4924 to 4950
- Subject(s) / Keyword(s):
- Ferroelectricity Complex Oxides Epitaxial Thin Films Oxide Membranes Interfaces
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
More Like this
-
-
Abstract We report the synthesis, X‐ray crystal structure, and molecular recognition properties of pillar[n]arene derivativeP[6]AS, which we refer to as Pillar[6]MaxQ along with analoguesP[5]ASandP[7]AStoward guests1–18. The ultratight binding affinity ofP[5]ASandP[6]AStoward quaternary (di)ammonium ions renders them prime candidates for in vitro and in vivo non‐covalent bioconjugation, for imaging and delivery applications, and as in vivo sequestration agents.more » « less
-
Our understanding of phosphorus (P) dynamics in the deep subseafloor environment remains limited. Here we investigate potential microbial P uptake mechanisms in oligotrophic marine sediments beneath the North Atlantic Gyre and their effects on the relative distribution of organic P compounds as a function of burial depth and changing redox conditions. We use metagenomic analyses to determine the presence of microbial functional genes pertaining to P uptake and metabolism, and solution 31 P nuclear magnetic resonance spectroscopy ( 31 P NMR) to characterize and quantify P substrates. Phosphorus compounds or compound classes identified with 31 P NMR include inorganic P compounds (orthophosphate, pyrophosphate, polyphosphate), phosphonates, orthophosphate monoesters (including inositol hexakisphosphate stereoisomers) and orthophosphate diesters (including DNA and phospholipid degradation products). Some of the genes identified include genes related to phosphate transport, phosphonate and polyphosphate metabolism, as well as phosphite uptake. Our findings suggest that the deep sedimentary biosphere may have adapted to take advantage of a wide array of P substrates and could play a role in the gradual breakdown of inositol and sugar phosphates, as well as reduced P compounds and polyphosphates.more » « less
-
Biodiversity datasets, or descriptions of biodiversity datasets, are increasingly available through open digital data infrastructures such as Global Biodiversity Information Facility (GBIF, https://gbif.org), Integrated Digitized Biocollections (iDigBio, https://www.idigbio.org) and the Biological Collection Access Service (BioCASE, http://www.biocase.org). </p> However, little is known about how these networks, and the data accessed through them, change over time. This dataset provide snapshots of the biodiversity dataset graphs as tracked by Preston (https://github.com/bio-guoda/preston , https://doi.org/10.5281/zenodo.1410543 ).</p> The rdf/nquad and tsv snapshots were generated using the respective commands:</p> preston ls | bzip2 > preston-ls.nq.bz2</p> and</p> preston ls --log tsv | bzip2 > preston-ls.tsv.bz2</p> For convenience, the first 100 uncompressed entries of both files are included, as well as the sha256 hashes of the content of the files.</p>more » « less
-
Abstract Implications of excess phosphorus (P) in waste streams obtained from soy‐based protein preparation processes on the environment and their potential utilization as P‐source are two significant understudied areas. Soybean‐based protein ingredients for food products retain comparatively enhanced functional properties and are cheaper than other plant‐based proteins. Soybean protein can be extracted and utilized as a food ingredient primarily by preparing soy protein concentrates (SPC) and soy protein isolates (SPI) from soybean meal/defatted soy flour (DSF). In a typical soybean processing facility, along with the soy products and soy‐protein preparations, the recovery of phosphorus as a coproduct will enhance the economic feasibility of the overall process as the recovered P can be used as fertilizer. In this study, the SPC and SPI were prepared from the DSF following widely used conventional protocols and P flow in these processes was tracked. In SPC production, ~59% of the total P was retained with SPC and ~34% was in the aqueous waste streams. For SPI process ~24% of total P was retained with SPI and ~59% went in the waste solid residue (~40%) and aqueous streams (~19%). About 80%–89% P removal from the waste aqueous streams was achieved by Ca‐phytate precipitation. This work demonstrated that in the process of SPC and SPI preparation the phosphorus from the waste aqueous streams can be precipitated out to avoid subsequent eutrophication and the waste solid residue with ~40% P can be reused as a P‐fertilizer as other applications of this residue are unspecified.more » « less
