CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Nan Wang,Zhiwei Zhou,Chunjiao Liu,Yongwang Liu,Xing Li,Yanling Yang,Li Zhao
Algae-derived organic matter (AOM) limits the effectiveness of conventional water treatment processes, affects the normal operation of water treatment plants, and causes water quality deterioration. Efficient elimination of AOM is an urgent issue in the advanced treatment of drinking water. In this study, A heterogeneous interface for AOM removal was established based on BT/C, which can be driven by visible light. The removal efficiencies of extracellular organic matter (EOM), intracellular organic matter (IOM), and AOM by BT/C reached the optimal levels at 30 min, 60 min, and 90 min, respectively, reaching 48.5 %, 81.8 %, and 74.0 %. BT/C can oxidize and break down a large amount of high-molecular-weight organic matter in EOM into medium- and low-molecular-weight organic substances, and effectively remove the low-molecular-weight organic matter in EOM. In addition, BT/C can efficiently remove humic acids(HS) and aromatic protein organic matter in IOM, directly mineralize or decompose high-molecular-weight biopolymers into small-molecular-weight acidic and neutral organic matter; electron paramagnetic resonance spectroscopy and reactive oxygen species trapping experiments verified that hydroxyl radical (·OH) have play most important role on the degradation of various molecular weight organic matters. Superoxide radical (·O 2 – ) plays a dominant role in the oxidation process of soluble microbial metabolites and HS, and ·OH plays a significant role in the oxidation process of amino acid-like proteins. This study provides new ideas and technical support for the complete removal of algae-derived organic matter and the protection of drinking water safety.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Kai-Ge Lu,Mengya Li,Haiou Huang
Reverse osmosis (RO) membranes were preconditioned in this study with humic acid , sodium alginate , or bovine serum albumin, and subsequently examined for silica scaling using the water matrix representative of concentrated brackish groundwater. The results suggested that water matrix combined with organic foulants affected silica scaling. High ambient pH favored the moderate silica ionization and thus the silica homogeneous polymerization to potentially form low molecular weight silica oligomers . The resulting scaling layer was dense and highly impermeable. Under the high Ca proportion at a given hardness, membrane scaling was enhanced through the Ca-induced silica scaling and the formation of intermolecular bridges between adjacent silica species. In contrast, high Mg hardness may facilitate the sustainable growth of silica oligomers to form the ringed high molecular weight oligomers by reducing the required energy for chain deformation. The deposition of these oligomers caused a loose scaling layer with reduced hydraulic resistance to water permeation. During the scaling tests under similar water matrix, the membranes slightly fouled by organics suffered severe flux decline due to an available space provided by the pre-existing organic fouling layer for subsequent silica scaling.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Feng Xiao,Ping Xiao,Dongsheng Wang
Algae are ubiquitous in surface water and affect the quality of surface water resources significantly by producing toxins as well as taste and odor compounds which adversely affect aquatic ecosystems and human health. This study was conducted to evaluate the effectiveness of three aluminum coagulants on algae removal by coagulation. Laboratory tests demonstrated that the maximum algae removal rates was 98.3% and 96.7% respectively by using PACl and Al 13 as coagulants, while the maximum algae removal rate was 88.3% by using Al 2 (SO 4 ) 3 as coagulant at 0.1 mmol/L. According to the results, it also can be noticed that PACl and Al 13 had a wide working pH range. In addition, the influence of allochthonous organic matters on algae removal during coagulation was also discussed. The removal rate was increased with a low bovine serum albumin (BSA) concentration owing to improving the adsorption-bridging. A poor coagulation performance was observed with the increasing of BSA dosage since the excess BSA molecules may prevent molecules from approaching and seize the active sites, causing coagulation inhibited. The addition of humic acid (HA) and sodium alginate (NaAlg) had adverse effects on the removal of turbidity and algae, attributed to the preferentially reaction between negative functional groups in HA/NaAlg and coagulant. Thick flocs were formed with the increasing of allochthonous organic matters as the calculation results of fractal dimension ( D f ). According to high pressure size exclusion chromatography (HPSEC) and three-dimensional fluorescence excitation-emission matrix spectrometry (3D-EEMs), allochthonous organic matter with high molecular weight (MW) can be completely removed, while the organics with low MW regardless of its origin were difficult to remove.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2025
·
IF 8.1
Danming Wen,Junyao Wang,Miaomiao Ding,Aikeyidanmu Zhamaerding,Xialin Hu,Daqiang Yin
Iodinated disinfection by-products (I-DBPs) have raised concerns due to their potential cytotoxicity and genotoxicity compared to chlorine and bromine-based by-products. In aquaculture, high-dose iodine-based disinfectants can react with natural organic matter (NOM) in water, generating significant amounts of I-DBPs that might pose environmental risks. This research explored the reaction characteristics of I-DBPs by using two commonly used iodine-based disinfectants (iodine tincture and Polyvinylpyrrolidone-iodine (PVP–I)) in aquaculture. The results indicated that controlling pH at around 8.0 effectively reduced I-DBP formation. A higher concentration of PVP-I (10 μM) was required to produce triiodomethane (TIM) compared to iodine tincture (2.5 μM), likely due to the slower release of iodine from PVP-I. The concentrations of I-DBPs showed a multiplicative growth trend as the concentrations of the iodine-based disinfectants increased. Humic acid (HA) demonstrated a stronger potential for I-DBP formation than algal-derived organic matter (AOM), including extracellular organic matter (EOM) and intracellular organic matter (IOM), due to its strong electron-withdrawing aromatic structure. While EOM led to a greater variety of I-DBPs, IOM contributed more significantly to TIM formation at higher disinfectant concentrations, probably due to its large molecular size and abundance of reactive carbon atoms. The I-DBP formation patterns in the aquaculture water are similar to those of HA, possibly due to the presence of similar compositional components, such as lignin and proteins. The study provides important insights for optimizing iodine disinfectant use in aquaculture and managing I-DBP risks.
研究领域:
环境科学
·
水产养殖
·
水化学
·
毒理学
·
消毒副产物
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Lei Li,Junyi Li,Cuiwen Zhu,Shuili Yu
2-Methylisoborneol (2-MIB), a major cause of taste and odor (T&O) in drinking water, tends to combine with the coexisting dissolved organic matter (DOM), resulting in the altering of the physico-chemical properties of 2-MIB, and its corresponding migration and removal behaviors during water treatment. In this study, dialysis and ultrafiltration were set up to differentiate bound and free 2-MIB, and the binding of different types of DOMs to 2-MIB was investigated. At 298 K, the Freundlich constants, K F ((ng/mg)(L/ng) 1/n ), representing the combination ability between 2-MIB and the model pollutants, followed the order hen egg-white lysozyme (HEL 22.52) > bovine serum albumin (BSA 19.23) > sodium carboxymethyl cellulose (CMC 9.69) > sodium alginate (SA 7.78), and humic substances exhibited a weak association with 2-MIB, indicating that aromatic structures provide few binding sites. The K F of natural organic matter (NOM 196.15) in real raw water was much larger than that of model pollutants owing to the complex composition and the wide molecular weight distribution. The major interactions between DOM and 2-MIB were van der Waals forces and hydrogen bonding, except that HEL were hydrophobic interactions. Common metal ions affected these associations and generally decreased K F . The findings in this study are of particular significance for the selection of proper strategy to maintain the water quality during the outbreak of T&O in the source.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Hui Zhou,Liye Tian,Maofei Ni,Sixi Zhu,Runyu Zhang,Liying Wang,Ming Wang,Zhikang Wang
In this study, disinfection by-products (DBP) formation from dissolved organic matter (DOM) and its fractions, including both hydrophilic and hydrophobic components, were investigated at a typical karst surface water. The subsequent DBP formation potential was evaluated by deducing chemical characteristics of DOM fractions and representative algal organic matter ( Chlorella sp. AOM) under the influence of divalent ions (Ca 2+ and Mg 2+ ) via spectra analysis. Both terrigenous and autochthonous DOM performed as critical DBP precursors, and DBP formation patterns were tightly correlated to organic matter chemical variations. DBP formation was significantly higher in drought period compared to that in wet period (P < 0.05). Particularly, trichloromethane (TCM) and dichloroacetonitrile (DCAN) showed distinct formation patterns compared to the scenarios in non-karst water. For DOM fractions, hydrophobic components showed higher DBP formation compared to hydrophilic counterparts, hydrophilic neutral enriched more reactive organic nitrogen for N-DBPs production. It was preferable to enrich humic-like substances after Ca 2+ and Mg 2+ complexation in Chlorella sp. AOM, TCM formation increased whereas DCAN production remained unchanged in the presence of divalent ions. This study innovatively provided a linkage between chemical characteristics of DOM and understanding of DBP formation in karst surface water.
研究领域:
环境科学
·
水质研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shanshan Qu,Jin Zhang,Yu Xiang,Jie Luo,Yan Zhang,Wenbo Wang,Hui Xu
Disinfection by-products (DBPs), which formed in the process of chlorination disinfection of water, has a potential threat to human health. To date, Natural organic matter (NOM) is the precursor of DBPs so that it is important to remove the NOM to reduce the generation of DBPs. Coagulation is a key process to remove the NOM from water. However, the traditional coagulants have poor removal ability for hydrophilic(HPI) NOM. In this study, multi walled carbon nanotubes was modified with Mg, Ca and Fe to produce modified multi walled carbon nanotubes and then reacted with Al 13 to produce composite coagulant. Al 13 and composited coagulants were utilized to treat water with bovine serum albumin to compare the removal efficiency for HPI NOM. The results showed that the composited coagulant had a relatively high removal efficiency for organic matter, and among them, the effect of Al 13 -MgMW is best. The DOM removal rates of Al 13 and Al 13 -MgMW at doses of 0.12 mmol/L were 64.8 % and 75 %, respectively. Meanwhile, Al 13 -MgMW had an 89.2 % removal rate for HPI NOM. The XPS and FTIR of flocs showed that the Al 13 -MgMW had a significant removal ability for O C substances such as proteins. MgMW has a larger specific surface area and pore volume. ESI-TOF-MS results showed the composited coagulants retain the original structure of Al 13 , and thus preserve and improve the advantages of Al 13 .
研究领域:
环境科学
·
水处理工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2019
·
IF 5.026
Shuang Xu,Xijuan Chen,Jie Zhuang
The mechanism by which soil organic matter (SOM) controls nanoparticle transport through natural soils is unclear. In this study, we distinguished the specific effects of two primary SOM fractions, mineral-associated organic matter (MOM) and dissolved organic matter (DOM), on the transport of hydroxyapatite nanoparticles (nHAP) through a loamy soil under the conditions of saturated steady flow and environmentally relevant solution chemistry (1 mM NaCl at pH 7). The results showed that MOM could inhibit the transport of nHAP by decreasing electrostatic repulsion and increasing mechanical straining and hydrophobic interactions. Specifically, the presence of MOM reduced the mobility of nHAP in the bulk soil and its macroaggregates by ~4 fold and ~6 fold, respectively, and this hindered effect became further conspicuous in microaggregates (~36 fold decrease). An analysis of extended Derjaguin-Landau-Vervey-Overbeek (abbreviated as XDLVO) interactions indicated that MOM could decrease the primary energy barrier ( Φ max1 ), primary minimum ( Φ min1 ), and secondary minimum ( Φ min2 ) to promote nHAP attachment. Conversely, DOM (10–50 mg L −1 ) favored nHAP mobility due to an increase in electrostatic repulsion among nHAP particles and between nHAP and soil surfaces. Pre-flushing soil with DOM (causing DOM sorption on soil) increased nHAP mobility by ~2 fold in the bulk soil and its macroaggregates, and this facilitated effect was furthered in microaggregates (~11 fold increase). The results of XDLVO interactions showed that DOM increased Φ max1 , Φ min1 , and Φ min2 , producing an unfavorable effect on nHAP attachment. Mass recovery data revealed that the MOM-hindered effect was stronger than the DOM-facilitated effect on nHAP transport. This study suggested that changing SOM fractions could control the mobility of nanoparticles in the subsurface considerably.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Dongyang Wu,Qing'e Sha,Shan Jiang,Luyun Liu,Citao Zhang,Jialin Song,Junhao Xu,Haoqi Chen,Guanghui Li,Zhangmin Xiang,Bin Jiang,Zhuangmin Zhong,Duohong Chen,Shupin Situ,Guanying Xu,Jianlin Hu,Boguang Wang,Junyu Zheng
China's aluminum-products industry, a large-scale consumer of industrial paints, is a potentially significant source of full-volatility organic compounds (F-VOCs). However, the emission characteristics of F-VOCs, including VOCs, intermediate-, semi-, and low-volatility organic compounds (I/S/LVOCs), and their role in ozone formation potentials (OFP), and secondary organic aerosol formation potentials (SOAP) remain unclear. In this study, we collected in-field samples from three industrial paints (solvent-based, water-based and powder paints) at spraying and drying processes, and treatment devices to analyze the emission characteristics of F-VOCs, OFP, SOAP. Results revealed water-based and powder paints—often marketed as eco-friendly—emitted non-negligible SOA precursors. The F-VOC emission factors of three paints based on the field measurement method and the material balance method were 3.3–57.3 and 1.5–61.8 (kg/t-raw materials), respectively. Due to overlooking I/S/LVOCs, conventional material balance methods underestimated F-VOC emissions from powder by 46.9–53.9 %, and SOAP and OFP from three paints by 18.1–80.9 % and 14.5–77.8 %, respectively. Despite comprising less than 25.0 % of total emissions, I/S/LVOCs dominated 70.0–80.0 % SOAP. The paint types and treatment devices rather than industrial processes are the main factors influencing volatility, phase distributions, and source profiles. Current controls reduce OFP by ∼80.0 % but SOAP by only ∼20.0 %, highlighting the evasion of I/S/LVOCs from mitigation strategies. In 2023, China's aluminum-products industry emitted 258.4 kt of F-VOCs, comparable to those from on-road diesel transportation. The findings indicate substantial F-VOC emissions from aluminum production and inadequate I/S/LVOC controls, necessitating their inclusion in emission inventories and air-quality models to enhance pollution control.
研究领域:
大气化学
·
环境科学
·
空气污染控制
·
工业排放
·
环境工程
✓ 已验证
DOI
PubMed
高影响因子
Nature Communications
·
2022
·Vol. 13
·期 1
·1-12
·
IF 17.694
Yang Ganceng,Jiao Yanqing,Yan Haijing,Xie Ying,Tian Chungui,Wu Aiping,Wang Yu,Fu Honggang
Paired electroreduction and electrooxidation of organics with water as a feedstock to produce value-added chemicals is meaningful. A comprehensive understanding of reaction mechanism is critical for the catalyst design and relative area development. Here, we have systematically studied the mechanism of the paired electroreduction and electrooxidation of organics on Fe-Mo-based phosphide heterojunctions. It is shown that active H* species for organic electroreduction originate from water. As for organic electrooxidation, among various oxygen species (OH*, OOH*, and O*), OH* free radicals derived from the first step of water dissociation are identified as active species. Furthermore, explicit reaction pathways and their paired advantages are proposed based on theoretical calculations. The paired electrolyzer powered by a solar cell shows a low voltage of 1.594 V at 100 mA cm −2 , faradaic efficiency of ≥99%, and remarkable cycle stability. This work provides a guide for sustainable synthesis of various value-added chemicals via paired electrocatalysis.
研究领域:
催化化学
·
电化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Zongping Wang,Ying Wan,Pengchao Xie,Aijiao Zhou,Jiaqi Ding,Jingwen Wang,Li Zhang,Songlin Wang,Tian C. Zhang
The effects of ultraviolet/persulfate (UV/PS) pretreatment on ultrafiltration (UF) membrane fouling caused by typical natural organic matter (NOM) fractions including humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA) were investigated. UF membrane fouling during the filtration of different NOM fractions after UV/PS pretreatment was compared through the evaluation of normalized membrane flux decline and membrane fouling reversibility. The fouling mitigation mechanisms were investigated through the characterization of ultraviolet absorbance (UV 254 ), dissolved organic matter , zeta potential , particle size distribution , fluorescence excitation-emission matrix spectra, and fitness of four classic fouling models. Furthermore, the fouled membranes were characterized by Fourier-transform infrared spectroscopy and scanning electron microscopy. The results showed that UV/PS pretreatment significantly alleviated membrane fouling caused by HA, SA, and HA-SA-BSA mixture, and the fouling control performance improved at high PS doses. However, either UV alone or UV/PS pretreatment at low PS dose (10 mg/L) significantly aggravated BSA fouling with the normalized flux at the end of first filtration cycle being 8% and 15%, respectively. The increased particle size of BSA after UV/PS pretreatment was attributed to the formation of aggregates, which mainly accumulated in membrane pores and aggravated membrane fouling. Modeling results suggest that the mitigation of membrane fouling derived from SA and mixed organic fractions was primarily ascribed to the control of cake filtration, while the mitigation of HA fouling was attributed to the declined contribution of standard blocking.
研究领域:
环境科学
·
水处理工程
·
膜技术
✓ 已验证
DOI
PubMed
高影响因子
Agriculture-Basel
·
2024
·Vol. 14
·期 12
·2289
·
IF 3.3
Youru Yao,Juying Li,Kang Ma,Jingyi Zhang,Yuesheng Lin,Huarong Tan,Jia Yu,Fengman Fang
Dissolved organic matter (DOM) is widely present in soil environments and plays a crucial role in controlling the morphology, environmental behavior, and hazards of arsenic (As) in soil. In the Fe-rich red soil of tea plantations, the decomposition of tea tree litter complicates DOM properties, leading to more uncertain interactions between DOM, Fe, and As. This study focused on three tea plantations in Huangshan City to investigate the contents of DOM, Fe, and As in surface red soils (Ferralsols) and establish their correlations. Three-dimensional fluorescence spectroscopy and PARAFAC analysis methods were used to analyze the DOM components and fluorescence signatures. Additionally, the process and mechanism of the binding of DOM-Fe with As were explored through laboratory experiments on the morphological transformation of As by DOM-Fe. The results showed that the pH values of the soils in the three tea plantations ranged from 3.9 to 5.2, and the entire sample was strongly acidic. The DOM exhibited strong intrinsic properties and low humification, containing three types of humic acid components and one intermediate protein component. The DOC content in the Fe-rich red soil did not have a direct correlation with Fe and As, but the interaction of DOM fractions with Fe significantly influenced the As content. Specifically, the interaction of protein-like fractions with Fe had a more pronounced effect on the As content. The maximum sorption rate of As by DOM was 15.45%, and this rate increased by 49 to 75% with the participation of Fe. In the configuration of the metal electron bridge, Fe acts as a cation, forming a connecting channel between the negatively charged DOM and As, thus enhancing the DOM’s binding capacity to As. DOM-Fe compounds bind As through surface pores and functional groups. These findings provide deeper insights into the influence of DOM on As behavior in Fe-rich soil environments and offer theoretical support for controlling As pollution in red soil.
研究领域:
土壤科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）