Huacheng Xu's research while affiliated with Chinese Academy of Sciences and other places
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Publications (34)
The increased copper ion (Cu²⁺) concentrations in aquatic ecosystem significantly influence the environmental quality and ecosystem safety, while information on the Cu²⁺ biotoxicity to aquatic microorganisms and the models for biotoxicity prediction are still unclear. In this study, the toxicities of Cu²⁺ to Chlorella vulgaris under different envir...
The structure especially the active site manipulation of Fenton-like catalysts was essential for the efficient removal of organic contaminants in the aquatic environment. In this study, the carbonized bacterial cellulose/FeMn oxide composite (CBC@FeMnOx) were synthetized and modified by hydrogen (H2) reduction to obtain the carbonized bacterial cel...
Exploring robust membrane with special wettability is of great significance for efficient emulsion separation under harsh environment. Herein, the multifunctional [email protected]@Ag/PES membrane with rough structure was successfully constructed, which exhibited remarkable emulsion separation and mechanochemical performances in high-salt brine sys...
Microplastics (MPs) are ubiquitous in aquatic ecosystems and can significantly influence the growth, aggregation and functions of phytoplankton biomass. However, variations in the extracellular polymeric substances (EPS) of phytoplankton in terms of compositions and structures in response to MPs were still not reported. In this study, EPS matrix of...
Reactive oxygen species (ROS) are omnipresent in natural aquatic environments, and play an important role in biogeochemical cycles. One of the dominant sources of ROS in surface waters was thought to be from dissolved organic matter (DOM) interacting with photochemical process. The properties of DOM were different between the flood and drought peri...
Modification is a key way to enhance the adsorption of tetracycline (TC) by biochar (BC), while how to optimize and identify the most suitable modification methods still need further exploration. In this study, hydrothermal pretreatment combined with K2FeO4 activation were applied to prepare the magnetic porous biochar (H-Fe-BC) derived from a typi...
The oxygenation of Fe(II)-bearing minerals for hydroxyl radicals (HO•) formation and contaminant attenuation receive increasing attention, while the mechanisms for specific Fe(II) species in manipulating HO• formation and contaminant attenuation are unclear. Herein, a total of four Fe(III)-bearing minerals were applied in the reduction-oxygenation...
The photochemical properties of dissolved organic matter (DOM) were highly related to the molecular weight (MW) and organic compositions. In this study, the bulk algae- and macrophyte-derived DOM (ADOM and MDOM, respectively) and Suwannee River humic acid (SRHA) were applied and fractionated into low MW- (LMW, <1 kDa) and high MW-(HMW-, 1 kDã0.45 μ...
Modification of pristine biochars has received increasing attentions due to the significant potential in enhancing adsorption performance. In this work, the co-modification of KOH and KMnO4 on biochar (K-Mn-BC) was performed, with the effect of KOH/KMnO4 modification on biochar properties and their adsorption toward tetracycline (TC) being extensiv...
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Pyrolysis process significantly influences the physicochemical properties and potential application of magnetic porous biochars (MPBCs). However, the effects of pyrolysis temperature on the properties of MPBCs as well as substantial adsorption are still unclear. This study reported a facile method to obtain the MPBC from tea waste via pyrolysis of...
As the emerging contaminants, the behavior and fate of microplastics (MPs) were highly related to the interactions with surrounding organic matters. However, information on the effects of molecular sizes of organic matters on the interaction is still lacking. In this study, the bulk algal-derived organic matter (AOM) samples were obtained and furth...
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The properties of biochars and their adsorption performance are highly dependent on the carbonation methods. In this study, five carbonation methods, namely, hydrothermal treatment (HT), direct carbonization (BC), carbonization of hydrochar (HBC), KHCO3 activation carbonation (KBC), and KHCO3 activation carbonation of hydrochar (KHBC), were adopted...
Tetracycline (TC) adsorption capacity on pristine biochar was limited. Biochar modification can greatly improve its adsorption amount. In this study, rice straw was mixed with FeCl3·6H2O and urea to prepare a Fe–N modified biochar via a one-pot pyrolysis method at 700°C. Meanwhile, pristine biochar (RSBC), urea modified biochar (N–RSBC), FeCl3·6H2O...
Rhizosphere, formed via the input of root exudates, is one of the most dynamic biological interfaces on earth. Investigation of carbon dynamics in rhizosphere is thus crucial for the understanding of soil biogeochemical processes. Herein, synchrotron radiation-based Fourier transform infrared (SR-FTIR) combined with two dimensional correlation spec...
Dissolved organic matter (DOM) exists ubiquitously in the aquatic environment with varying chemical compositions and a wide molecular weight (MW) distribution, which, as a result, exhibits differing impacts on the behavior and fate of contaminants. The current methods for the MW characterization of DOM usually possess some weaknesses and therefore,...
Dissolved organic matter (DOM) adsorption on colloid surface occurred ubiquitously in aquatic ecosystems, while variations in molecular weight (MW) distribution during adsorption remained poorly understood. In this study, the adsorption and MW fractionation of aquatic DOMs with different origins (e.g., macrophyte- and algae-derived, MDOM and ADOM,...
Cyanobacterial extracellular polymeric substances (EPSs) in aquatic environments are easily adsorbed onto colloidal particles, whereas the adsorption behavior as affected by molecular weight (MW) properties remained unknown till now. Herein, the bulk cyanobacterial EPS matrix (<0.45 μm) was fractionated into high MW (HMW-, 1 kDa~0.45 μm) and low MW...
Colloidal particles in lake waters interact inevitably with cyanobacterial extracellular polymeric substance (EPS), which will change their behavior and fate. Quantitative prediction of the effects of cyanobacterial EPS on colloidal behavior is difficult due to its variability and heterogeneity. To explore the effects of molecular weight (MW) fract...
Natural organic matter (NOM), a heterogeneous mixture with various organic components and continuous molecular weight (MW) distribution, is omnipresent in natural waters. To date, understanding of the MW-dependent adsorption fractionation of NOM samples on colloids is limited due to the lack of NOM fractionation and characterization methods. In thi...
The metal binding potential of dissolved organic matter (DOM) is highly related with its inherent properties such as molecular weight (MW). Here sediment DOMs with different origins, i.e., algae- and macrophyte-dominated sediment DOM (named as ASDOM and MSDOM, respectively), were size-fractionated into low MW (LMW-, <1 kDa) and high MW (HMW-, 1 kDa...
Colloidal particles are omnipresent in lake sediments and substantially influence the retention, transportation, and fate of contaminants in lake ecosystems. In this study, the abundance, chemical composition and adsorption behavior of sedimentary colloids (including total and inorganic colloids) from different ecological regions, were for the firs...
Citations
... This demonstrates that the adsorption of MB on HBC and CAHBC was dominated by multilayer adsorption (Aaddouz et al., 2023), but on BC and CABC it was a monolayer process (Liu et al., 2021b). The fitting of Temkin model is attributed to the chemisorption with electrostatic contact force (Fan et al., 2024). Thus, electrostatic contact force participated the adsorption process of MB on HBC and CABC. ...
... When nHAP was loaded onto the surface of BC, the agglomeration effect of nHAP was mitigated [5]. Moreover, BC may enhance the leaching of phosphorus from nHAP through processes such as protonation or ion exchange, leading to the formation of stable phosphate precipitates with heavy metals [32,33]. This reduces the risk of rerelease of absorbed heavy metals. ...
... Microcystis is a unicellular alga, which produces extracellular polysaccharides (EPS), and forms colony by wearing it. The EPS surrounding Microcystis cells is mainly composed of carbohydrate, protein and nucleic acid 21) , which might alter the characteristics of adsorbent after preparation. Therefore, EPS was removed from ...
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... Due to their locations ( Fig. 1), these two sites are more strongly impacted by the Pearl River plume in September compared to the other sites (Lee et al., 2006). In addition, these two sites are prone to plume bulges, which have been attributed to nutrient accumulation, microorganism growth, and contaminant release from sediment (Horner-Devine et al., 2009;Wu et al., 2022). The Pearl River plume and plume bulges could have contributed to the distinctiveness of the seawater chemistry, optical properties, and RIs photoproduction of the S1 and S8 samples. ...
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... Based on the adsorption of the produced biochar, the possible mechanisms in this study were electrostatic attraction, π-π stacking interactions, hydrogen bonding, and hydrophobic interactions (Zhang et al., 2022c). According to the analysis of the electrification and isoelectric points of TCN, adsorption was mainly caused by electrostatic attractions (Zhang et al., 2022b). ...
... This comparison also illustrated that the degree of oxygen participation could affect the signal strength of HO 2 •. No characteristic peak of •OH was detected in the filtrate of GR-Pd(II) system by EPR, because the dioxygen activation by iron minerals, such as GR and magnetite, tends to produce surface-bound •OH rather than free •OH [47]. Therefore, the GR-Pd(II) system could co-produce H* and •OH under oxic conditions, while H* could also be involved in the reduction of DO to generate •OH. ...
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... Recently, EEM spectroscopy using PARAFAC analysis has been successfully applied for the identification of components, sources, and pollutant binding properties of DOM owing to its high sensitivity and efficiency [4,11,13]. Fluorescent indices, such as the spectral slope ratio (S R ), fluorescence index (FI), biological index (BIX), and humification index (HIX), have been widely used to trace the origin and transformation of DOM from various sources [14][15][16][17]. ...
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... Li et al. [17] reported that many types of crop residues, such as corncob, coconut shell, and rice husk can be converted into biochar via pyrolysis in an inert atmosphere. Other agricultural residues, such as peanut shells, wheat straw, and rape straw could be used to prepare biochar by activating chemical reagents such as MgO, KOH, and KMnO 4 [18,[20][21][22]. Overall, physical and chemical modifications have been proven to improve the textural parameters, surface chemistry, and adsorption capacity of biochar. ...
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... The adsorption mechanism of carbon materials on organic pollutants mainly involves a pore-filling effect, as well as π−π bond and electrostatic attractions [12,23,[39][40][41]. The adsorption mechanisms responsible for the remarkable performance of 3K-SCB 750 for NOR removal can be described as follows. ...
... (1) Heating at 85 ± 2 °C using a water bath for 1 h; the ratio of sediment and solution was 1:10 (repeat twice); (2) Shaking for 16 h (22 ± 2 °C); the ratio of sediment and solution was 1:50 F4 Residual fraction -Using the total content subtract the sum of the first three fractions where A is the absorbance, l is the cuvette path length (m), and a(λ) is the adsorption coefficient at wavelength λ (m −1 ). Specific UV absorbance at 280 nm (SUVA280, in L mg-C −1 m −1 ) was calculated by dividing a(280) by the dissolved organic carbon (DOC) concentration (Ye et al. 2021). ...
