Shaofeng Wang

Shaofeng Wang
Chinese Academy of Sciences | CAS

Ph.D

About

163
Publications
11,956
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4,179
Citations
Citations since 2016
82 Research Items
2446 Citations
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400
20162017201820192020202120220100200300400

Publications

Publications (163)
Article
An advanced cost-saving method of removal of high-As(III) from SO4(-II)-rich metallurgical wastewater has been developed by diluting the SO4(-II) content with As(III)-Cl(-I)-rich metallurgical wastewater and then by the direct precipitation of As(III) with Fe(III) at pH 2.3. As(III) removal at various SO4(-II)/Cl(-I) molar ratios and temperatures w...
Article
The incorporation of sulfate (SO42−) into the scorodite (FeAsO4·2H2O) lattice is an important mechanism during arsenic (As) fixation in natural and engineered settings. However, spectroscopic evidence of SO42− speciation and local structure in scorodite lattice is still lacking. In this study, X-ray diffraction (XRD), Fourier transform infrared spe...
Article
Hydrometallurgical iron-arsenic (Fe–As) coprecipitation residue (FACR), a massive industrial solid waste, is a potentially cheapest Fe(III) source for the removal and fixation of As in waste sulfuric acid (WSA) as stable scorodite. This study innovatively proposed a method by controlling a low supersaturation degree of ferric arsenate in WSA via st...
Article
Full-text available
Arsenic (As(III)), more toxic and with less affinity than arsenate (As(V)), is hard to remove from the aqueous phase due to the lack of efficient adsorbents. In this study, a core–shell structured MnO2@La(OH)3 nanocomposite was synthesized via a facile two-step precipitation method. Its removal performance and mechanisms for As(V) and As(III) were...
Article
The species and fate of arsenic (As) are closely related to sulfide (S−II) in the anaerobic and sulfidic environment. In this work, the mechanisms and kinetics of arsenate (AsV) reduction by S−II at different pHs, S−II/AsV molar ratios, and initial AsV concentrations in the absence (or presence) of Al-hydroxide were studied, where the concentration...
Article
The factors and mechanisms affecting the fate of the associated Cd during the Fe(II)-activated Cd-bearing ferrihydrite transformation remain poorly understood. Herein we have conducted a series of batch reactions containing ferrihydrite with diverse pH values and initial Fe(II) and Cd concentrations coupled with chemical analyses and spectroscopic...
Article
The effect of sulfate (SO4²⁻) on the precipitation of As(V) and Fe(III) and the stability of the generated solid pHase as well as its underlying mechanisms, which strongly influences the transportation and fate of As in acidic waters (such as acid mine drainage), is still not well known. This work systematically investigated the precipitation, deco...
Article
Thioarsenic species are widely existed in transitional environments with varying redox potential such as hot springs and paddy fields, where arsenite, sulfide and thioarsenites may be exposed to ambient air. However, arsenic speciation, especially the kinetics of arsenic transformation in such scenarios are not well studied. Here we present results...
Article
Ubiquitous co-existence of arsenic (As) and cadmium (Cd) in smelting operations and mine drainage presents a major challenge to the environment. Fe(II)-induced ferrihydrite transformation into secondary, more crystalline minerals often controls the geochemical behavior of associated contaminants including arsenate (As(V)) and Cd(II) in natural and...
Article
Zn(II) enhances the adsorption of arsenate in heavy metal wastewater onto iron oxides, but the effect of Zn(II) on the removal of As during the oxidation of As(III) to As(V), corresponding to remediation of As-rich acid mine drainage (AMD) via oxidation-precipitation method, is still unclear. The rapid and efficient removal of As from As-rich AMD i...
Article
Stabilizing the hazardous calcium arsenic residues (CAR) and monitoring the subsequent fate of arsenic (As) are critical to reduce its risk to the environment. In this work, a novel in situ method has been proposed to stabilize CAR by adding FeIII solution and subsequent formation of the secondary mineral (yukonite). The experiments were conducted...
Article
The effect of high concentration of iron (FeIII) on the speciation and mobility of arsenic (As) under strongly acidic conditions remains unclear. This work studied the redistribution and speciation of AsV and FeIII at Fe/As molar ratio of 1–14 and pH 1.5–2.0 in the dissolved, colloidal, and solid phases. Results showed that the elevated FeIII induc...
Article
The effect of co-existent Al(III) in As-rich AMD on As removal via oxygen-induced abiotic oxidation caused concern due to weak affinity between Al(III) hydroxide and As(III). The removal of As from As-rich AMD with and without Al(III) at various pH and Fe/(Al)/As molar ratios was investigated. The results showed that 92.3–99.8% of As in Al(III)-con...
Article
Full-text available
Dinitrogen gas (N2) production removes fixed N from the marine biosphere; however, questions remain over the relative influence of microbial processes in determining N2 efflux from coastal sediments. Here, we quantify N2 production processes and controlling factors along a ∼2,500 km continental shelf sediment transect of China via combined molecula...
Article
Coprecipitation of molybdate (Mo(VI)) with ferric iron (Fe(III)) is usually employed for the treatment of Mo-bearing acid mine drainage (AMD) and mineral-processing effluents. However, the speciation of Mo(VI) in the Fe(III)–Mo(VI) coprecipitates and the roles of process parameters in Mo(VI) removal remain unclear. In this work, the effects of pH,...
Poster
Full-text available
The adsorption of solvated ions onto solid substrates is a phenomenon that controls many natural processes in nature and we have taken advantage of this to create, manipulate and manufacture materials in many areas of daily life. Unfortunately, we have only been able to observe equilibrium snap-shots of adsorption events through the various analyti...
Article
The coprecipitation and subsequent aging of Fe(III)-As(III)-As(V)-SO4²⁻ play an important role in controlling As behavior in acidic systems, such as acid mine drainage and hydrometallurgical acid waste. In this study, we investigated the redistribution and transformation of As in the Fe(III)-As(III)-As(V)-SO4²⁻ system (As(III)/As(V) ≈ 1) at differe...
Article
Hydrous ferric arsenate (HFA) is an important secondary arsenic (As)-bearing precipitate in mining-impacted environments. However, the role of iron(II) (Fe(II)) ions input in the phase transformation of HFA is largely unknown. In this work, we investigated the phase transformation of HFA in the presence of Fe(II) ions at various pH values (2–8) and...
Article
High concentration of arsenic (As) in waste sulfuric acid (WSA) generated from hydrometallurgical mineral processing must be removed and immobilized for protecting local environments. However, the economical and efficient treatment method for WSA is still lacking. We proposed the precipitation of As in WSA as scorodite by using economical siderite...
Article
Arsenic (As) adsorbed on Fe oxyhydroxides (adsorbent) is widely occurring in many environmental settings such as in acid mine drainage systems or in the hydrometallurgical operations to form Fe-As coprecipitates. However, the influence of the reaction media and the drying treatment on the microstructure of the directly formed adsorbents at various...
Article
The toxicity and mobility of antimony (Sb) are strongly influenced by the redox transformation of widely spread 2-line ferrihydrite (Fh) in natural soils and sediments. This study investigated the transformation and redistribution of adsorbed antimonite (Sb(III)) during Fe(II)-catalyzed recrystallization of Fh under anaerobic conditions. X-ray diff...
Article
Arsenic-alkali residue (AAR) is one of the major hazardous solid wastes produced by the antimony (Sb) smelter industry and may pose a serious threat to the local environment and public health. However, effective method for the treatment of AAR is still lacking. In this study, a new method for the effective treatment of AAR is proposed for the use o...
Article
Full-text available
A novel model was developed to estimate heavy metal flux at regional scale by using the Revised Universal Soil Loss Equation (RUSLE) to estimate soil erosion. This model was then used to estimate the fluxes of heavy metals including Zn, Cu, Cr, Ni, Cd, and As in three mono-lithologic regions in upper Pearl River Basin including carbonate rock (CR)...
Article
Full-text available
In the present work, a lanthanum hydroxide adsorbent was prepared by a simple precipitation process, and its arsenic removal performances and adsorption mechanisms were investigated by batch experiments and various techniques including field emission scanning electron microscopy with energy-dispersive X-ray spectrophotometry (FESEM–EDX), Brunauer–E...
Article
In this work, the stability of arsenate adsorbed Mg(II)–Al(III)/Fe(III)–CO3/SO4 Layered Double Hydroxides (LDHs) under three abiotic anoxic reductive conditions that may be encountered in Tailings Management Facilities (TMFs) were evaluated. At pH 8 and 10 mM Fe(II) (aq), the formation of Fe(III)-oxy/hydroxides (FeOHs) occurred for all 5 LDHs but t...
Article
Full-text available
The biotic or abiotic reduction of nano-crystalline 2-line ferrihydrite (2-line FH) into more thermodynamically stable phases such as lepidocrocite-LP, goethite-GT, magnetite-MG, and hematite-HT plays an important role in the geochemical cycling of elements and nutrients in aqueous systems. In our study, we employed the use of in situ liquid cell (...
Article
Scorodite waste during its short-term storage in an iron environment has proved to pose an arsenic pollution risk. However, the long-term stability of scorodite is not completely understood. This work investigated the effect of iron reduction by enolic hydroxyl groups as reductive natural organic matter on long-term stability of scorodite. The resu...
Article
A combination process of Fenton-like and catalytic Mn(II) oxidation via molecular oxygen-induced abio-oxidation of As(III)-Mn(II)-rich acid mine drainage (AMD) is developed to rapidly and efficiently remove As and obtain low As-leaching solids in this study. The effect of pH, temperature, oxygen flow rate and neutralization reagent on As removal wa...
Article
Full text (available before August 27, 2020): https://authors.elsevier.com/c/1bMrNzLNSVfwS. Marine deposit feeders are of ecological significance in transferring sedimentary Cd along aquatic food chains. A key process for this transfer is these organisms’ dietary uptake of Cd via solubilization of Cd present in ingested contaminated sediment. To...
Article
Arsenic–calcium residue (ACR) is one of the major hazardous solid wastes produced by the metallurgical industry that poses a serious threat to the environment. However, a suitable method for the effective treatment of ACR is still lacking. In this study, an alternative treatment method for ACRs via the immobilization of As as scorodite was proposed...
Article
Iron-arsenate (FeIII-AsV) coprecipitate generated in acid mine drainage and hydrometallurgical practices is one of the potential sources of As contamination in the environment. However, the As behavior as well as the transformation process of the FeIII-AsV coprecipitate is still not fully understood under acidic conditions. This work systematically...
Article
The ubiquitous arsenic in groundwater poses a great risk to human health due to its environmental toxicity and carcinogenicity. In the present work, a new adsorbent, δ-MnO2 modified activated carbon, was prepared, and its performance for the uptake of arsenate and arsenite species from aqueous solutions was investigated by batch experiments. Variou...
Article
The coexistence of calcium (Ca²⁺), sulfate (SO4²⁻) with trace metal cations (M(II)) can possibly lead to M(II)-gypsum coprecipitation and solid solution formation. However, gypsum's role in the fixation of M(II) is still largely unknown. This study investigated the precipitation of Ca²⁺ and SO4²⁻ in the presence of M(II) (i.e., Cu²⁺, Zn²⁺, or Cd²⁺)...
Article
Gypsum is the most common sulfate mineral on Earth’s surface and is the dominant solid byproduct in a wide variety of mining and industrial processes, thus representing a major source for heavy metal(loid) contamination, including selenium. Gypsum crystals grown from the gel diffusion technique in 0.02 M Na2SeO4 solution at pH 7.5 and 0.02 M Na2SeO...
Article
Arsenic- and trace metals-bearing gypsum (As-gypsum) is one of the major hazardous solid wastes produced from metallurgical industry that poses a serious threat to the environment. However, the method for effective extraction of As and trace metals from As-gypsum is still lacking. In this study, simultaneous extraction of As and trace metals from a...
Article
Low levels of antimony (Sb) can be effectively removed from water by adsorption onto various materials, and searching for low-cost and high-efficiency new adsorbents has been a hot topic in recent years. In the present study, the performance of cetyltrimethylammonium bromide (CTAB) modified MnFe2O4/MnO2 composites (CTAB/MnFe2O4/MnO2) as an adsorben...
Article
Tooeleite (Fe6(AsO3)4SO4(OH)4·4H2O) is widely precipitated for direct As(III) removal from sulfate-rich industrial effluents. However, whether or not Fe(III)-As(III)-Cl(-I) precipitate is produced in chloridizing leaching media for As immobilization is almost unknown. This work founded the existence of ferric arsenite (hydroxy)chloride as a new min...
Article
Selenium (Se) is an essential nutrient for human beings at trace concentrations, but also a hazardous contaminant at high concentrations. As an important geological adsorbent, the transformation of 2-line ferrihydrite (Fh) strongly influences the geochemical behavior of selenium. However, little is known about the effect of the recrystallization of...
Article
Sediment particulates can be ingested by benthic animals, and the bioavailability of associated metals strongly depends on their speciation in the sediments. Different sedimentary components have distinct physiochemical characteristics and result in different biological responses from animals. Therefore, the bioaccumulation of particle-bound trace...
Article
The Hun River is a major tributary of the Liao River in the northeast area of China and provides drinking water for 23 million local residents. This study was designed to assess the severity of metal contamination in the Hun River and the potential use of indigenous organisms (the fish Zacco platypus and the snail Radix swinhoei) as biomonitors of...
Article
The redistribution and transformation of arsenic (As) during the Fe(II)-catalyzed transformation of As-adsorbed ferrihydrite remains unclear. This study investigated the re-crystallization process and products of As-adsorbed ferrihydrite accelerated by Fe(II) and the fate of arsenate and arsenite at pH 7 under anaerobic condition. Fourier transform...
Article
Sulfidization of nano-ferrihydrite (nano-Fhy) by S(−II) plays an important role in Fe and As biogeochemistry in wetland soils, sediments, and aquifers. However, during early stages, the changes in speciation and redistribution of adsorbed As remain unclear. This study investigated the reduction and transformation of As-bearing nano-Fhy and subseque...
Article
The synthesis of ZnFe-CO3 and ZnFe-SO4 Hydrotalcites (HTLCs) has been previously described in numerous literature reports but these methods contain impurity phases that arise from a lack of understanding of the experimental conditions under which these impurities form during the precipitation of these types of HTLCs. Furthermore, the majority of th...
Article
Full-text available
The molecular-level surface complexation structure of Ca²⁺ at the goethite/water interface remains unclear. We investigated the sorption of Ca²⁺ on the surfaces of goethite using classical molecular dynamics (MD) simulations and Ca K-edge X-ray absorption near edge structure (XANES) spectroscopy. The XANES results showed that Ca²⁺ was sequestered b...
Article
Oxygen-induced abio-oxidation of Fe(II) and As(III) for Fe-As co-precipitation is proposed in this work as a cost-saving and time-saving method to remove As from As-rich acid mine drainage (AMD). The effect of pH, Fe/As molar ratio, oxygen flow rate, temperature, initial As concentration and neutralization reagent on As removal was investigated. Th...
Article
The coprecipitation of arsenic with Fe(III) by lime neutralization is widely used in industrial practices to treat arsenic-containing waste waters generated from mineral processing operations. In this work, coprecipitation was conducted directly at pH 8 to simulate the operations in hydrometallurgical practices, which differed from the conventional...
Article
The adsorption and desorption behavior of arsenate (As(V)) at the ferrihydrite/water interface in nature is determined by its complexation structure. However, current understanding of the coordination environment of As(V)-ferrihydrite complexes obtained from synchrotron extended X-ray absorption fine structure (EXAFS) fitting is still controversial...
Article
The adsorption behavior of thioarsenite (TAs III ) on the surface of hematite (α-Fe 2 O 3 ) is unknown at present. In the present study, we have investigated the transformation and reactions of TAs III [monothioarsenite (MTAs III ) and dithioarsneite (DTAs III )] on the surface of α-Fe 2 O 3 in the presence of sulfide at S/As = 1 and 3 by X-ray abs...
Article
Full-text available
Rare earth elements (REE) in gypsum have long attracted interest for geochemical applications from the reconstruction of paleoclimate, paleoenvironment and paleohydrology to the monitoring of volcanic and seismic activities. Resurgent interests in REE in gypsum stem from the potential recovery of these high-tech metals from gypsum-rich tailings. De...
Article
Full-text available
Crystalline scorodite (FeAsO 4 ·2H 2 O) is a common arsenic-(As-)containing solid waste produced from nonferrous metallurgical processes. Its stability is the key factor to determine environmental risks. Scorodite is stable in the mildly acidic environment, while in a neutral to weakly alkaline environment, it can easily decompose and release As in...
Article
Hydrometallurgical FeIII-AsV coprecipitates, which are amorphous in nature, could re-crystallize gradually and pose risks of contamination to the environment. However, the mechanisms controlling the As behavior when the FeIII-AsV coprecipitates stored at different pHs is still not fully understood. This work systematically investigated the fate of...
Article
It is well known that calcium arsenates may not be a good choice for arsenic removal and immobilization in hydrometallurgical practices. However, they are still produced at some plants in the world due to various reasons. Furthermore, calcium arsenates can also naturally precipitate under some specific environments. However, the transformation proc...
Article
Water quality is declining worldwide and an increasing number of waterbodies lose their ecological function due to human population growth and climate change. Constructed floating wetlands (CFWs) are a promising ecological engineering tool for restoring waterbodies. The functionality of CFWs has been studied in-situ, in me-socosms and in the labora...
Article
Full-text available
Solubilization of arsenate in guts of deposit-feeders is a key process for their dietary uptake of arsenate from contaminated sediments. The present study explored this digestive solubilization with in vitro extraction experiments that quantified arsenic (As) release from substrates (natural sediment and As-enriched iron oxides) in the presence of...
Article
Arsenic is ubiquitous in many natural systems and poses great risk to human health. Coal fly ash is a waste by-product of thermal power plants that may cause serious environmental problems. To reduce environmental hazards and realize high-value utilization of coal fly ash, it was characterized using the scanning electron microscopy, Brunauer-Emmet-...
Article
A novel method has been proposed to prepare an arsenate (As(V))-containing solution for scorodite formation using an arsenic (As) sulphide residue obtained from a Pb refinery. Preparation of the As(V) solution from the As sulphide residue included As oxidation leaching by alternating addition of a highly concentrated sodium hydroxide (c-NaOH 600 g/...
Article
The potential hazards of Fe(III)-As(V) co-precipitate under reducing conditions are incompletely known. This work investigated the effect of Fe(III) reduction by ascorbic acid (AH2) on the stability of Fe(III)-As(V) co-precipitate at different pHs and Fe/As molar ratios. The results showed that As (14–98.9%) and Fe (27.9–99.3%) were significantly r...
Article
The reduction of Fe(III) in iron hydroxides plays a significant role in the geochemical cycling of arsenic. However, the adsorption behavior of arsenic (As) at mixed-valence Fe(II,III) (hydr)oxides/water interface remains unclear. This work presents the kinetics, isotherms, and pH edge of arsenite (As(III)) and arsenate (As(V)) co-adsorption on the...
Article
Gypsum is a high-volume by-product of hydrometallurgical arsenic removal using the Fe(III)-As(V) coprecipitation technique. However, the role of gypsum in As fixation during the Fe(III)-As(V) coprecipitation process and the potential risk of As-bearing gypsum are still not well known. In this study, the fixation of As by gypsum was quantitatively i...
Article
Long-term storage of Fe(III)-As(V) co-precipitate wastes derived from the industrial As removal process poses the risk of secondary arsenic pollution to the local environment. However, its stability in only iron-reducing environment remains unclear. The effect of iron reduction by hydroquinone (QH2) on the stability of co-precipitate at Fe/As molar...
Article
Thioarsenite (TAsIII) is an important arsenic (As) species under sulfidic environments. Adsorption behavior of TAsIII on iron (Fe)-bearing minerals affects the transformation and the distribution of As at solid-liquid interface. In this study, we investigated the formation of TAsIII species in the mixed arsenite and sulfide (AsIII-S-II) solutions w...
Article
Full-text available
Two-line ferrihydrite (Fh), ubiquitous in soils, groundwater, and aquatic sediments, may serve as an important sink for sequestering trace metals, metalloids, and organic matter via adsorption/coprecipitation due to its high surface area and reactivity. Although considerable attention has been paid to the transformation process of this thermodynami...