Journal of Environmental Sciences
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2021
·
IF 5.565
Xueyi Dong,Xihua Cao,Wenbin Jiang,Xiuxian Song,Zhiming Yu,Shitao Yu
Polyaluminum chloride modified clay (PAC-MC) is a safe and efficient red tide control agent that has been studied and applied worldwide. Although it is well known that the distribution of hydrolytic aluminum species in PAC affects its flocculation , little is known about the influence of particulars aluminum species on the microalgae removal efficiency of PAC-MC; this lack of knowledge creates a bottleneck in the development of more efficient MCs based on aluminum salts. The ferron method was used in this study to quantitatively analyze the distributions of and variations in different hydrolytic aluminum species during the process of microalgae removal by PAC-MC. The results showed that Al a , which made up 5%–20% of the total aluminum, and Al p , which made up 15%–55% of the total aluminum, significantly affected microalgae removal, with Pearson's correlation coefficients of 0.83 and 0.89, respectively. Most of the aluminum in the PAC-MC sank rapidly into the sediments, but the rate and velocity of settlement were affected by the dose of modified clay. The optimal dose of PAC-MC for precipitating microalgae was determined based on its aluminum profile. These results provide guidance for the precise application of PAC-MC in the control of harmful algal blooms .
研究领域:
环境科学
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水处理工程
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DOI
PubMed
高影响因子
ANNALS OF BOTANY
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2024
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IF 3.6
Guo Huanhuan,Li Shiqin,Liu Yong,Yang Qinsong
Background and AimsChinese pistachio (Pistacia chinensis Bunge), an important horticultural plant species, holds great ornamental value with beautiful leaves and fruits. Seedling propagation of this tree species is restricted by its erratic seed germination, however, the germination mechanism is ambiguous yet. The aim of this study was to figure out the germination mechanism from the novel perspective based on the multi-omics data.MethodsThe multi-omics technique combined with hormone content measurement was first applied in seed germination of Chinese pistachio.Key ResultsDue to the great accumulation during seed germination, catechin stood out from the identified metabolites by broadly targeted metabolomic analysis. Exogenous catechin of 10 mg/L significantly improved the germination of Chinese pistachio seeds. An interesting result of hormone analysis showed that the improving effect of catechin could be attributed to increase of the gibberellic acid 3 (GA3) content rather than decrease of the abscisic acid (ABA) content before germination. The paclobutrazol (PAC, a GA biosynthesis inhibitor) and PAC + catechin treatments also showed that the promoting effect of catechin on seed germination depends on GA biosynthesis. Transcriptome analysis and qRT‒PCR further revealed that catechin induced the expression of PcGA20ox5 to activate GA biosynthesis. Several transcription factors were induced by catechin and GA treatments, such as TCP, bZIP and C3H, which may play an important regulatory role in GA biosynthesis in a catechin-mediated way.ConclusionsCatechin promotes seed germination via GA biosynthesis in Chinese pistachios. This study proposes a novel mechanism by which catechin promotes seed germination via the GA pathway, which provides new insight into a comprehensive understanding of seed dormancy and germination.
研究领域:
植物学
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植物生理学
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分子生物学
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园艺学
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DOI
PubMed
高影响因子
Applied Catalysis O: Open
·
2024
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IF 0
Tingting Zhang,Yanling Yang,Xing Li,Zhiwei Zhou,Bigui Wei
In this work, a new ultrasound-assisted heterogeneous activation of persulfate by nano zero-valent iron (US-nZVI/PS) technique was employed to regenerate powder activated carbon (PAC) that had been saturated with chloramphenicol (CAP). US-nZVI/PS process can successfully regenerate the CAP-saturated PAC. Response surface methodology was effectively performed and under the specific optimum regeneration conditions the actual experimental regeneration efficiency of PAC reached 93.96%. As evidenced by the results of EPR and quenching experiments, both SO 4 •− and •OH were identified as the main reactive species responsible for the regeneration process. The regeneration process considerably promoted the generation of oxygen-derived surface functional groups.
研究领域:
环境科学
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化学工程
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材料科学
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DOI
Green Chemical Engineering
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2024
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IF 9.1
Enze Li,Jing Dong,Yongsheng Jia,Zihe Pan,Hongzhou Lv,Zhiping Du,Guandao Gao,Fangqin Cheng
Sufficient treatment of industrial organic wastewater with high salt and large amounts of suspended particulate matter remains a challenge worldwide. In this work, a novel coagulation-flotation combined process was developed to treat the suspended particles as well as significantly reduce organic pollutants content in the actual high-salt organic wastewater. Four typical inorganic and organic flocculants (poly aluminum chloride (PAC), poly ferric sulfate (PFS), polyacrylamide (PAM), and modified cationic starch (CS)) were selected for compounding to obtain an optimized flocculation system for high-salt wastewater. The results showed that the PAC-PAM with a 10:1 ratio in mass exhibited the best coagulation behaviors with the removal efficiency of turbidity and chemical oxygen demand (COD) being 95.33% and 9.21%, respectively, under the optimal operation conditions, and the sedimentation process of coagulant conformed to the quasi-second-order kinetics. The PAC-PAM flocs exhibited stronger netting, sweeping, and adsorption bridging capabilities, which were conducive to removing suspended particles. When the flotation was conducted after coagulation, the COD decreased significantly by 20.82%. In addition, this combined process could reduce the treatment time by 50% compared to the process with only coagulation treatment. During the flotation process, floc particles companies with hydrophobic polycyclic aromatic hydrocarbons could collide and adhere to microbubbles and be floated to the surface, resulting in an effective reduction of COD. This work could provide a novel strategy and step forward to design and optimize the pretreatment process engineering for organic high-salt wastewater.
研究领域:
环境工程
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废水处理
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化学工程
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DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2018
·Vol. 97
·期 4
·955-966
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IF 1.265
Chuang Wang,Guocheng Zhu,Bozhi Ren,Peng Zhang,Andrew Hursthouse
Dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) are important components of the aquatic environment and may produce harmful disinfection by-products through chlorination associated with water treatment processes. Therefore, it is necessary to remove them from the water. Coagulation is a cost-effective water treatment technique as the key unit in the pretreatment of drinking water but deals with DON poorly. We present a study to investigate the enhancement of poly aluminum chloride (PAC) using a cationic polymer for the removal of both DON and DOC. The cationic dimethyl diallyl ammonium chloride (PDMDAAC) polymer was hybridized with PAC to remove DON and DOC. The results showed that the PDMDAAC increased the charge neutralization capacity of PAC and floc aggregation, thereby increasing the settling efficiency of the flocs. The PDMDAAC increased the amount of colloidal species in PAC, which was beneficial to the formation of adsorption-bridging. With the increase of pH, a greater proportion of colloidal adsorption sites were used in the removal of DON. The DOC, DON, and turbidity removal were dependent on multiple interactions through charge neutralization, adsorption-bridging, and floc sweeping. However, DOC and DON removal were primarily determined by adsorption-bridging and floc sweeping, while turbidity removal was mainly dependent on charge neutralization.
研究领域:
环境科学
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水处理工程
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DOI
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Sha Li,Yuan Yang,Yisong Hu,Jialing Tang,Xiaochang C. Wang
Due to the issues of high energy consumption, high carbon emissions, and low resource and energy recovery, there is an urgent need to develop new paradigms for simultaneous wastewater treatment and resource utilization using physicochemical processes rather than conventional biological means. Recently, direct membrane filtration of municipal wastewater using ultrafiltration/microfiltration technology was proposed and showed satisfactory performance, with high membrane costs and fast membrane fouling as the main limitations. In this study, a novel two-stage powdered activated carbondynamic membrane filtration (PAC-DMF) system was developed using PAC as a carrier to enhance DM formation and organic pollutant retention. The particle size and dosage of PAC, strategy for operating the continuous reactor in the first stage, and selection of the PAC particle size in the second stage were investigated. The effluent from the first stage was found to have a stable water quality, with turbidity in the range of 50–70 NTU. Efficient retention of organic materials was also achieved with a retention rate of 74%–82%, and the COD content in the concentrate was above 3,000 mg/L in the cycle filtration experiment. In the second stage, further enhancement of water quality and organics retention were observed, as evidenced by the low effluent COD (<70 mg/L) and turbidity (5–20 NTU). Meanwhile, the effluent that was rich in nitrogen and phosphorus was suitable for agricultural irrigation or gardening. The results indicated that the developed two-stage PAC-DMF system could be a highly promising alternative to the conventional wastewater treatment process.
研究领域:
环境工程
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水处理技术
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膜科学
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可持续资源管理
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DOI
高影响因子
FOOD CHEMISTRY
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2025
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IF 9.8
Ying Han,Xuening Yang,Shiyao Fu,Chuqiang Que,Zuxin Zhang,Xiaoting Wang,Jing Wang,Xin Yang
Proanthocyanidin B2 (Pac B2) exhibits potent antioxidant properties but suffers from poor stability in vivo , limiting its applications in food and medicine. This study developed composite nanoparticles (NPs) utilizing abietic acid (AA) and oleanolic acid (OA) as carriers, significantly enhancing Pac B2's stability. The OA/AA-Pac B2 NPs, prepared via solvent co-precipitation, were spherical with an average diameter of 164.18 nm and an encapsulation efficiency of 43.26 %, demonstrating improved thermal stability. Analytical techniques such as infrared spectroscopy, ultraviolet spectroscopy, and molecular dynamics revealed interactions such as hydrogen bonding and hydrophobicity between AA and Pac B2. The NPs facilitated sustained release of Pac B2 in simulated gastric and intestinal fluids over 2 h at 37 °C. In vitro tests demonstrated enhanced bioavailability and absorption efficiency of OA/AA-Pac B2 NPs compared with free Pac B2, validating the effectiveness of the co -assembly strategy in improving polyphenols' stability and bioavailability.
研究领域:
食品科学
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药物化学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2026
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IF 9
Mengyao Xiao,Dachao Lin,Yang Zou,Jiaqi Chen,Zhihong Wang,Jinxu Nie,Yunlong Luo,Xinglin Lu,Xing Du
Groundwater containing dissolved manganese (II) poses a significant challenge to the drinking water treatment process. Ceramic membrane technology enhances manganese removal, but its low permeate flux constrains its practical implementation. To improve efficiency, an integral aeration-MnOx fluidized bed system coupled with ceramic membrane filtration (A-MFB-CF) was developed and operated continuously for 176 days. It demonstrated efficient manganese removal, reducing Mn 2+ concentrations from 0.5–1.5 mg/L to <0.02 mg/L while maintaining a high water flux (60–120 LMH). Mn-oxidizing bacteria (MnOBs), including Ralstonia, Hyphomicrobium, and Pseudomonas , in PAC-MnOx particles, were identified using microbial community analysis. An increased abundance of MnOBs led to stronger resistance to Mn(II) shock loading. Continuous operation of A-MFB-CF filtration accelerated the conversion of MnOx, as evidenced by surface morphology evolution showing dynamic restructuring and bio-chemical synergy. The MnOx transformation pathway transitioned from dissolved Mn(II) species, to small 3D particles [Mn(III)/Mn(IV)] and large-sized 3D aggregates, eventually evolving into 2D layered sheets. The presence of birnessite with low crystallinity was confirmed using Raman and X-ray diffraction (XRD) analysis, and this structure contributes to its superb catalytic oxidation efficiency and high Mn(II) adsorption capacity. X-ray photoelectron spectroscopy (XPS) analysis further demonstrated the formation of catalytically active birnessite, characterized by mixed valence states of Mn (III) and Mn (IV). Electron Paramagnetic Resonance (EPR) indicated that MnOx formation was initially dominated by biologically mediated conversion, followed by a shift to physicochemical processes during prolonged operation. Additionally, PAC-MnOx fluidization in ceramic membrane tank effectively mitigated cake layer deposition and thus reduce membrane fouling. Our findings demonstrate an effective and space-efficient water treatment strategy, particularly suitable for decentralized water supply scenarios with stringent footprint constraints.
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
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2025
·
IF 4.3
Yunxiao Ban,Zhijie Wan,Cong Ma,Yuzhen Wu,Haoran Chen
This study proposes a magnetic levitation fixed bed flocculation reactor as an effective method for the removal of Cr (VI). The research examines the effects of both single and dual polymer flocculants on the efficiency of the flocculation process. Initially, a magnetic levitation layer was established using a radial magnetic field in conjunction with stainless steel balls. Subsequently, polyaluminum chloride (PAC) and a non-ionic coagulant, polyacrylamide (NPAM), were introduced into the water to create a magnetic levitation fixed bed flocculation reactor. This reactor with the objective of purifying water contaminated with simulated Cr (VI). The results indicate that the incorporation of a reducing agent, specifically FeSO 4 , in conjunction with PAC and NPAM respectively, can achieve Cr (VI) removal rates exceeding 97% and turbidity removal rates exceeding 96%. The interaction between the cross-flow influent and the flocculating particles promotes the formation of micro-vortex flocculation.
研究领域:
环境科学
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水处理工程
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2017
·
IF 4.208
Xue Shen,Baoyu Gao,Xin Huang,Fan Bu,Qinyan Yue,Ruihua Li,Bo Jin
This study systematically determined the optimal dosage ratio and the viscosity (η) of co-coagulants, polyaluminum chloride (PAC) and poly dimethyldiallylammonium chloride (PDMDAAC), on coagulation performance and membrane fouling in a hybrid coagulation-ultrafiltration (C-UF) process for natural organic matter (NOM) removal. Floc characteristics—including floc size, fractal dimension, strength and re-growth ability—were studied with respect to coagulant-dosing operations. Membrane fouling was evaluated in association with assessment of NOM removal performance by the hybrid process. The best coagulation performance was achieved when PAC and PDMDAAC were dosed with 1.0 mg/L and 0.1 mg/L, respectively. The addition of PDMDAAC could enhance the NOM removal efficiency, especially at low PAC dosages. Co-coagulants PAC/PDMDAAC (η PDMDAAC = 2.18 dL/g) resulted in formation of the largest flocs with the smallest D f under all shear conditions, while the flocs formed by PAC/PDMDAAC (η PDMDAAC = 1.86 dL/g) had higher recovery abilities. The results from ultrafiltration experiments indicated that coagulation using PAC/PDMDAAC with a viscosity range from 0.99 dL/g to 1.86 dL/g can significantly reduce membrane fouling, leading to increasing water fluxes from 0.1170 to 0.4906 in the ultrafiltration process.
研究领域:
环境工程
·
水处理技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Guofu Huang,Mianmian Wang,Yongyou Hu,Jianhua Cheng,Sihao Lv,Kui Yang
As a typical congener of Polybrominated diphenyl ethers (PBDEs), 2,2′,4,4′-tetrabromodiphenyl ether (BDE47) has attracted more and more attention due to its high biological toxicity and environmental abundance. In this study, a novel polyanionic cellulose stabilized Pd/Fe (PAC-Pd/Fe) nanoparticle was successfully synthesized for BDE47 degradation under ambient condition. Batch experiments showed that BDE47 degradation followed pseudo first-order kinetic model. Pd loading played a crucial role as it affected the formation of activated hydrogen species H ∗ and accelerated electron transfer. At Pd loading of 0.3 wt%, nearly 100% BDE47 was degraded completely within 10 min by 0.4 g L −1 PAC-Pd/Fe nanoparticles. When compared with strong acidic (pH 3) and alkaline (pH 9 and 11) conditions, weak acidic condition (pH 5) was more favorable for BDE47 degradation, with nearly 100% BDE47 was removed within 7.5 min. In the presence of HA inhibited the degradation of BDE47, and the degradation efficiencies within 15 min decreased from 100%, 88.6%, 79.5% to 73.1% as HA concentration increased from 0, 10, 40 to 70 mg L −1 . The degradation of BDE47 by PAC-Pd/Fe nanoparticles was a reductive debromination process, and a stepwise debromination from n-Br to (n-1)-Br BDEs was the dominant reaction, in which the para -Br was more susceptible to remove than ortho -Br. This study suggests PAC-Pd/Fe nanoparticle can be utilized as a promising remediation technology for PBDEs contaminated wastewater.
研究领域:
环境科学
·
污染治理
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产品关联
DOI
高影响因子
PURE AND APPLIED CHEMISTRY
·
2012
·Vol. 85
·期 2
·417-425
·
IF 2.789
Xiao Wang,Feng Hao,Huiyuan Chen,Gang Wang,Jianbao Li,Hong Lin
Single-crystalline anatase TiO 2 nanorods (TiO 2 -SANRs) were synthesized through a facile solvothermal method and successfully applied as the photoanodes for efficient dye-sensitized solar cells (DSCs). The prepared samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray diffraction (XRD). The power conversion efficiencies of TiO 2 -SANRs decorated Degussa P25 nanoparticle solar cells increased by 13.5 % compared with commercial Degussa P25 TiO 2 solar cells under standard illumination conditions (AM 1.5G, 100 mW/cm –2 ). The improved performance of the TiO 2 -SANRs decorated Degussa P25 nanoparticle solar cells was primarily ascribed to the enhanced short-circuit photocurrent density ( J sc ) despite a declined dye-loading capacity. The light-scattering effect in the long-wavelength region, as evidenced from the incident photon-to-current conversion efficiency (IPCE) response and the diffuse reflectance spectroscopy was recognized as the main reason for the photocurrent enrichment.
研究领域:
材料科学
·
能源科学
✓ 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）