Anaerobic digestion (AD) with hydrothermal (HT) pretreatment is an emerging technology for enhanced resource recovery from sewage sludge. This study investigates the speciation of Fe, P, and S during sequential HT-AD treatment sludge using chemical extraction, X-ray diffraction, absorption spectroscopy. Results suggest strong correlations between Fe P species as well species, affecting solubility bioavailability each other. For instance, much vivianite formed in hydrochars after HT at low...

Mn oxides are among the most ubiquitous minerals on Earth and play critical roles in numerous elemental cycles biotic/abiotic loops as key redox center. Yet, it has long puzzled geochemists why laboratory synthesis of todorokite, a tunnel-structured oxide, is extremely difficult while dominant form over other tunneled phases low-temperature natural environments. This study employs novel electrochemical method to mimic cyclic reactions occurring geological time scales an accelerated manner....

This study introduces a new and previously unconsidered fast abiotic formation of Mn(iv) oxides. We report photochemically assisted oxidation Mn2+ (aq) to (s) by superoxide radicals generated from nitrate photolysis. photochemical pathway generates randomly stacked layered birnessite (δ-MnO2) nanosheets.

Anaerobic digestion (AD) combined with hydrothermal treatment (HT) is an attractive technology for sewage sludge and resource recovery. The fate distribution of heavy metals in the during HT/AD significantly affect final disposal/utilization options, yet such information still lacking. This study systematically characterizes transformation important Cu, Zn, Cr AD pre- or interstage HT (i.e., HT-AD AD-HT-AD, respectively). Complementary sequential chemical extraction X-ray absorption...

Todorokite, an octahedral molecular sieve (OMS-1), is characterized by its large 3 × tunneled structure (∼1 nm) formed a metal oxide framework. Todorokite-type manganese oxides have garnered interest in materials science and environmental chemistry due to their nanoporous ionic conductive channels natural ubiquity. However, conventional synthesis of todorokite involves energy- time-consuming processes: (1) layered Mn oxide, (2) Mg-intercalation into the layer, (3) hydrothermal transformation...

Transmission GISAXS shows the real-time evolution of sizes and structures Li dendrites, from primary nanoparticles to fractal dimensions.

Anaerobic digestion (AD) with interstage hydrothermal treatment (HT) (i.e., AD–HT–AD) is an emerging technology for energy and nutrient recovery from sewage sludge. Yet, systematic understanding on the speciation evolution of phosphorus (P) other redox-sensitive elements iron (Fe) sulfur (S) during AD–HT–AD still missing. This study investigated coupled changes P, Fe, S sludge using complementary chemical extraction, microscopy, spectroscopy analyses. Results indicated that after first-stage...

Hydrothermal treatment (HT) is an emerging technique for sustainable sewage sludge management and resource recovery. Many sludges are rich in iron (Fe) due to the common addition of Fe salts water recovery facilities. To develop guidance reaction conditions targeting nutrient recovery, this study systematically investigated influence HT temperature, time, source on dynamic speciation evolution phosphorus (P) nitrogen (N) during Fe-rich sludge. Complementary chemical extraction X-ray...

The early formation of manganese (hydr)oxide nanoparticles at mineral-water interfaces is crucial in understanding how Mn oxides control the fate and transport heavy metals cycling nutrients. Using atomic force microscopy, we investigated heterogeneous nucleation growth under varied ionic strengths (IS; 1-100 mM NaNO3). Experimental conditions (i.e., 0.1 Mn(2+) (aq) concentration pH 10.1) were chosen to be relevant remediation sites. We found that IS controls Mn(OH)2 formation, controlled...

Coal fly ash (CFA) has gained increasing societal concerns as hazardous trace elements (HTEs) in CFA might pose environmental and public health risks. To develop better management remediation strategies, it is highly important to obtain an in-depth understanding of the occurrence mobility HTEs CFA. This study systematically characterized speciation, distribution, Cr, Ni, Cu class F C samples using scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM–EDX), absorption...

The consumption of lithium-ion batteries (LIBs) has considerably increased over the past decade, leading to a rapid increase in number spent LIBs. Exposing LIBs environment can cause serious environmental harm; however, there is lack experimentally obtained information regarding impacts abandoned cathode materials. Here, we report interactions between

Recent findings have showed the environmental abundance of soluble Mn(III)-complexes (e.g., Mn-siderophore and Mn(III)-pyrophosphate (Mn(III)-PP)). Specifically, Mn(III)-PP is emerging interest in understanding Mn redox cycling phosphorus catalysis systems. Curiously, however, further oxidation consequent formation a MnO2 solid phase not been considered yet. Here, using photochemically-assisted fast Mn2+ (aq) by reaction with superoxide, generated from nitrate photolysis, we report role PP...

The wettability of rocks and minerals significantly affects the safety efficiency energy-related subsurface operations. Salinity is an important controlling factor in terms but has received limited attention. We studied effects salinity-induced chemical reactions on biotite's changes under relevant conditions. Biotite was reacted at 95 °C 102 atm CO2 for 70 h solutions with salinities 0, 0.1, 0.5, 1.0 M NaCl. Then, static dynamic water contact angles biotite basal surfaces were measured...

Managed aquifer recharge (MAR) has been applied to meet quickly growing water demands. However, during MAR operations, the injected can induce dissolution of local minerals and result in release toxic metalloids, such as arsenic. To alleviate this concern, it is pivotal understand effects chemistry on arsenic mobilization MAR. In bench-scale study with geochemical conditions relevant we investigated impacts three environmentally abundant oxyanions (i.e., phosphate, silicate, bicarbonate)...

Effects of heat-treat procedure and sintering temperatures were investigated in 0.67Bi1.05FeO3-0.33BaTiO3ceramics. The structure, dielectric, ferroelectric, piezoelectric properties ceramics made by normal cooling or quenched process investigated. All show single pseudo-cubic perovskite crystal structure. Although the structure was not changed but other much heat-treatment. normally cooled ceramic showed 'pinched' ferroelectric hysteresis loops with remanent polarization value about 10...

The early nucleation stage of Mn (hydr)oxide on mineral surfaces is crucial to understand its occurrence and the cycling nutrients in environmental systems. However, there are only limited studies heterogeneous Mn(OH)2(s) as initial precipitation. Here, we investigated effect pH quartz. Under various conditions 9.8, 9.9, 10.1, analyzed structural matches between quartz heterogeneously nucleated Mn(OH)2(s). were calculated by measuring lateral vertical dimensions using grazing incidence small...

Anaerobic digestion (AD) with prestage hydrothermal treatment (HT) is an emerging strategy for the sustainable management of sewage sludge and recovery valuable resources. Both struvite vivianite can be precipitated during AD process serve as two important phases phosphorus (P) and/or nitrogen (N) recovery. Yet effect HT conditions on phase selection precipitation vs in subsequent remains unclear. This study investigated evolution mineralization P N using complementary chemical extraction...

The redox reaction of manganese (Mn) is great environmental, geological, and public health significance, as Mn oxides control the distribution electron flow numerous nutrients contaminants in natural engineered environments. Current understanding on oxidation pathways Mn(II) to Mn(III/IV) mainly focuses biotic processes due their much higher rates than those abiotic processes. This study demonstrates rapid photocatalytic Mn2+(aq) under circumneutral conditions catalyzed by naturally abundant...

CeO₂nanoparticles are extensively used in industrial applications owing to their high redox-catalytic activities and, as a result, may appear aquatic environments where they undergo significant surface chemistry transformation with other redox-active species.