Jeffrey Paulo H. Perez

Jeffrey Paulo H. Perez
Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ | GFZ · Section 3.5 Interface Geochemistry

PhD Earth Sciences (Geochemistry)

About

25
Publications
4,470
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
345
Citations
Introduction
I am a Postdoctoral Scientist working at the Interface Geochemistry research group, headed by Prof. Liane G. Benning, at GFZ German Research Centre for Geosciences. For my postdoctoral research, I will be mainly working on molecular scale mineral-organic matter interface processes in soils.
Additional affiliations
February 2020 - present
GFZ German Research Centre for Geosciences
Position
  • PostDoc Position
January 2019 - May 2019
University of Leeds
Position
  • Researcher
Description
  • Royal Society of Chemistry Researcher Mobility Grant: "Scanning transmission electron microscopy electron energy loss spectroscopy (STEM-EELS) studies of 'green rust' phases"
October 2017 - February 2018
University of Copenhagen
Position
  • Researcher
Education
February 2017 - January 2020
Freie Universität Berlin
Field of study
  • Earth Sciences
September 2014 - September 2016
Ghent University
Field of study
  • Applied Biological Sciences
June 2007 - April 2012
University of the Philippines Los Baños
Field of study
  • Chemical Technology and Engineering

Publications

Publications (25)
Article
Full-text available
Sulfidated nanoscale zerovalent iron (S-nZVI) exhibits low anoxic oxidation and high reactivity towards many chlorinated hydrocarbons (CHCs). However, nothing is known about S-nZVI reactivity once exposed to complex CHC mixtures, a common feature of CHC plumes in the environment. Here, three S-nZVI materials with varying iron sulfide (mackinawite,...
Article
Full-text available
Iron-bearing nanominerals such as ferrihydrite, schwertmannite, and green rust behave as metastable precursors leading to the formation of more thermodynamically stable iron mineral phases (e.g., jarosite, goethite, hematite, and magnetite). However, this transformation may last from days to tens or even hundreds of years, making them the most pred...
Article
Full-text available
Green rust (GR) is an Fe(II)-Fe(III)-bearing phase that forms in oxygen-poor and Fe2+-rich subsurface environments where it influences trace element cycling and contaminant dynamics. GR phases have been shown to have high arsenic (As) uptake under anoxic and circum-neutral pH conditions. While geochemical controls on As uptake by GR have been ident...
Article
Full-text available
The valorization of coffee wastes through modification to activated carbon has been considered as a low-cost adsorbent with prospective to compete with commercial carbons. So far, very few studies have referred to the valorization of coffee parchment into activated carbon. Moreover, low-cost and efficient activation methods need to be more investig...
Article
The valorization of coffee wastes through modification to activated carbon has been considered as a low-cost adsorbent with prospective to compete with commercial carbons. So far, very few studies have referred to the valorization of coffee parchment into activated carbon. Moreover, low-cost and efficient activation methods need to be more investig...
Article
Full-text available
The weathering front is the boundary beneath Earth’s surface where pristine rock is converted into weathered rock. It is the base of the “critical zone”, in which the lithosphere, biosphere, and atmosphere interact. Typically, this front is located no more than 20 m deep in granitoid rock in humid climate zones. Its depth and the degree of rock wea...
Article
Full-text available
Arsenic (As) contamination in groundwater remains a pressing global challenge. In this study, we evaluated the potential of green rust (GR), a redox-active iron phase frequently occurring in anoxic environments, to treat As contamination at a former wood preservation site. We performed long-term batch experiments by exposing synthetic GR sulfate (G...
Article
Lead(II) is a toxic pollutant often found in metal-contaminated soils and wastewaters. In acidic aqueous environments, Pb(II) is highly mobile. Chemical treatment strategies of such systems therefore often include neutralization agents and metal sorbents. Since metal solubility and the retention potential of sorbents depend on the redox state of th...
Article
Detrital peat (organic carbon-enriched deposit) with high arsenic (As) content is widely distributed in sediments where groundwater As contamination exists. Iron sulfides often persist in these sediments under anoxic conditions. However, the mechanisms and pathways of formation of iron sulfides and its potential contribution in controlling As mobil...
Article
Full-text available
‘Green rust’ (GR), a redox-active Fe(II)-Fe(III) layered double hydroxide, is a potential environmentally-relevant mineral substrate for arsenic (As) sequestration in reduced, subsurface environments. GR phases have high As uptake capacities at circum-neutral pH conditions, but the exact interaction mechanism between GR phases and As species are st...
Article
Full-text available
Sulfidized nanoscale zerovalent iron (S-nZVI), synthesized via two-step using Na2S, is an emerging in situ material for groundwater remediation, composed of a metallic iron core and iron sulfide shell. The shell efficiently transfers electrons from the core to its surface for contaminant reduction, while simultaneously protecting the core from anox...
Article
Full-text available
The controlled crystallisation of struvite (MgNH 4 PO 4 ·6H 2 O) is a viable means for the recovery and recycling of phosphorus (P) from municipal and industrial wastewaters. However, an efficient implementation of this recovery method in water treatment systems requires a fundamental understanding of struvite crystallisation mechanisms, including...
Article
Full-text available
Iron (oxyhydr)oxides play an important role in controlling the mobility and toxicity of arsenic (As) in contaminated soils and groundwaters. Dynamic changes in subsurface geochemical conditions can impact As sequestration and remobilization since the fate of As is highly dependent on the dominant iron mineral phases present and specifically the pat...
Article
Critical and precious metals are essential in many modern applications. While their natural sources are depleting, one must adapt to guarantee a reliable supply by developing new and optimizing existing techniques to recover the elements from unexplored material flows. The aquatic phase is of great meaning to this issue, as migration from solid to...
Article
Analytical transmission electron microscopy (TEM) is often used to investigate morphologies, crystal structures, chemical compositions and oxidation states of highly reactive mixed-valent mineral phases. Of prime interest, due to its potential role in toxic metal remediation, is green rust sulphate (GRSO4) an FeII-FeIII layered double hydroxide. In...
Article
Arsenic (As) contamination in groundwater is a significant health and environmental concern worldwide because of its wide distribution and toxicity. The fate and mobility of As is greatly influenced by its interaction with redox-active mineral phases, among which green rust (GR), an FeII-FeIII layered double hydroxide mineral, plays a crucial role....
Article
‘Green rust’ intercalated with aromatic sulfonates can potentially be effective materials for the treatment of soil and groundwater polluted with chlorinated benzenes. We investigated the potential intercalation of benzene sulfonate (BzS) and 1,3-benzene disulfonate (BzDS) into green rust sulfate (GRSO4) via ion exchange. The GRSO4 reacted with var...
Poster
In this study, we examined the Fe(II)-Fe(III) layered double hydroxide, green rust sulfate (GRSO4), as a novel sustainable adsorbent for groundwater remediation. We investigated the interaction between freshly-precipitated GRSO4 and arsenic species, As(III) and As(V). We tested the effect of variable metal concentrations, ionic strength (0.005 to 0...
Article
The dithiol functionalized UiO-66-(SH)2 is developed as an efficient adsorbent for the removal of mercury in aqueous media. Important parameters for the application of MOFs in real-life circumstances include: stability and recyclability of the adsorbents, selectivity for the targeted Hg species in the presence of much higher concentrations of inter...
Poster
Full-text available
In this study, we present a novel hybrid material using the triazine-based Covalent Organic Framework, CTF-1, as a support for γ-Fe2O3 nanoparticles synthesized in situ. This novel hybrid material harnesses both the high reactivity and selectivity of nanoparticles and the versatile structural properties and high specific surface area of microporous...

Network

Cited By

Projects

Projects (3)
Project
To elucidate nano-scale mechanisms of formation and reactivity of (redox-active) Fe-bearing phases (e.g., Fe (oxyhydr)oxides, sulfides, carbonates, phosphates) using (scanning) transmission electron microscopy
Project
Development and application of novel functionalized nanoporous adsorbents with improved affinity, selectivity and capacity for metal species in water
Project
The main goal of the project is to investigate the formation of 'green rust', which is a mixed-valent iron layered double hydroxide, and its interactions with groundwater contaminants.