Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yimu Qiao,Xue Han,Feiyong Chen,Cuizhen Sun,Linxu Xu,Rupeng Liu,Xue Shen
To guide the practical application of ozonation and adsorption coupled with ceramic membrane technology , the mitigation mechanisms of O 3 pre-oxidation, powdered activated carbon (PAC) pre-adsorption, and combined O 3 -PAC pretreatment on membrane fouling caused by natural organic matter (NOM) were investigated. The membrane and water quality were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), three-dimensional fluorescence-parallel factor analysis (PARAFAC-EEM), dissolved organic carbon (DOC), laser particle size and Zeta potential . Results showed that the membrane flux decline caused by humic acid (HA), sodium alginate (SA), bovine serum albumin (BSA) and surface water were alleviated by 35.2%, 55.2%, 31.0% and 59.0% after O 3 -PAC pretreatment. Meanwhile the removal rates of HA, SA and BSA were 26.2, 74.8% and 42.3%, respectively. The combination of PAC and O 3 can effectively control the membrane fouling caused by HA and SA. Ozonation can degrade organic matter into small molecules, and PAC has high adsorption to these small molecules, by recycling PAC can take away this part of organic matter, thereby reducing membrane fouling. O 3 showed no obvious advantage for membrane fouling caused by BSA, and the decrease of membrane fouling was mainly attributed to the adsorption of PAC. This investigation highlights the potential mechanism of O 3 -PAC in alleviating the membrane fouling caused by different organic compounds, contributing to the efficient and low-carbon operation of the production.
研究领域:
环境工程
·
水处理
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Jie Hou,Chao Hu,Yanlong Wang,Jianying Zhang,Jason C. White,Kun Yang,Daohui Lin
The biological effect of soilborne nanoparticles (NPs) is a manifestation of soil-NMs-bio interactions. Soil factors are known to restructure NPs surfaces and thus influence the nanotoxicity. However, the mechanisms by which environmental factors affecting nano-bio interactions to aggravate or alleviate nanotoxicities are poorly understood. Herein, we compared the toxicity of TiO 2 NPs (nTiO 2 ) in five soils using the model nematode ( Caenorhabditis elegans ), and investigated the variation of nano-bio interactions under different conditions. A correlation analysis showed that pH and dissolved organic matter (DOM) were dominant regulators of nTiO 2 toxicity. At the nano-bio interface, low pH (5.0) led to nTiO 2 adhesion to micron-sized furrows and aggravated dermal wrinkling, while humid acid (HA) alleviated these impacts. Mechanically, low pH increased nTiO 2 adhesion through enhanced electrostatic attraction and subsequent stimulation of mucin and collagen synthesis, resulting in a positive feed cycle of pH-dependent contact nanotoxicity. HA not only prevented nTiO 2 adhesion onto the epidermis due to its negative charge, but also relieved the overstimulation of stress response pathways, thereby alleviating nanotoxicity. These findings broaden our knowledge of how NPs induce contact toxicity in soil invertebrates through specific biointerfacial interactions, and highlight the important role of DOM in alleviating the combined hazards of NPs and soil acidification.
研究领域:
环境科学
·
纳米毒理学
·
土壤生态学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Qian Wang,Juan Li,Qiuyueming Zhou,Ting He,Zhaoliang Cui,Young Moo Lee,Weihong Xing
Dissolved organic matter (DOM) is recognized as a crucial factor contributing to the irreversible fouling of ultrafiltration membranes. Quartz crystal microbalance with dissipation (QCM-D) offers insights into the kinetics of fouling layer formation and its structure in-situ on a model membrane. However, a clear correlation between the membrane fouling process and the adsorption-desorption results obtained from QCM-D has yet to be established. In this study, piezoelectric β-phase PVDF membranes were prepared, and their fouling behavior in response to three model compounds (humic acid (HA), dextran (DEX), bovine serum albumin (BSA), and their mixed solutions was examined. It was firstly proposed that the spin-coated model PVDF membrane surface exhibited a typical β-phase structure, characterized by regular undulations resulting from strong stretching effects. A novel double layer piezoelectric sensor, consisting of a β-phase layer over a piezoelectric quartz substrate, was designed for QCM-D analysis to assess the mass and stiffness variations of the absorbed DOM layer. The fouling tendency followed the order of BSA > Mixture > DEX > HA, with the foulant monomeric units having a similar molecular mass of around tens of kDa. Irreversible fouling resistance in series model as well as frequency drop in QCM-D were listed as indicators of irreversible fouling caused by foulant-membrane interaction, which realized a well-defined match for the first time.
研究领域:
膜科学
·
环境工程
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Guiqiao Wang,Weiye Shi,Defang Ma,Baoyu Gao
Bisulfite-activated permanganate (PM/BS) oxidation process can oxidize ciprofloxacin in complex water matrices rapidly. However, effects of PM/BS pre-oxidation on the formation of disinfection byproducts (DBPs) during post-chlorination of ciprofloxacin-contaminated waters need to be addressed. This study investigated the formation of trihalomethanes (THMs), haloacetonitriles (HANs), haloketones and trichloronitromethane during chlorination of ciprofloxacin-contaminated humic acid (HA), bovine serum albumin (BSA) and alginate solutions, and revealed the effects of PM/BS pre-oxidation on ciprofloxacin degradation and DBP formation during post-chlorination, considering the presence of Br − . Only THMs and HANs were quantifiable. THMs were the most abundant. Ciprofloxacin-contaminated HA exhibited the highest formation potential of DBPs and integrated toxic risk value (ITRV). In the absence of Br − , PM/BS pre-oxidation reduced or hardly affected the toxicity risks derived from DBPs formed from the post-chlorination. However, the presence of Br − greatly reduced the degradation of ciprofloxacin (30–50%) in various waters. In the ciprofloxacin-contaminated waters containing Br − , the total ITRVs of DBPs formed from post-chlorination increased by 60%–800% with PM/BS pre-oxidation, attributing to the enhanced formation of DBPs especially bromochloroacetonitrile and dibromoacetonitrile. Overall, PM/BS is a potential pre-oxidation technology for the treatment of ciprofloxacin-contaminated waters without bromide.
研究领域:
环境科学
·
水处理
·
化学工程
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Mei Dong,Kuilong Liu,Guoqiang Song,Guiping Ma
In this study, MOF-on-MOF hybrids were successfully synthesized by interfacial growth method using CoZn-ZIF as guest MOF and MIL-101(Fe) as host MOF, and then employed as heterogeneous catalysts to activate peroxymonosulfate (PMS) in the degradation of dyes. The hybrids exhibited different morphologies depending on the Co/Zn ratios (10/0, 10/2, 10/10, and 2/10), all of which displayed exceptional catalytic performance. Notably, the hybrid with a Co/Zn ratio of 10/2 showed the highest degradation rate of MB, reaching 100 % removal within 3 min with a k obs value of 452.75 Lg −1 min −1 based on the pseudo-second-order kinetic model. Through EPR characterization and scavenging experiments, it was determined that the degradation of dyes occurred through a combination of radical (SO 4 •-, •OH)and non-radical ( 1 O 2 ) pathways, with 1 O 2 and SO 4 •- playing prominent roles. Various factors such as Co/Zn ratio, catalyst dosage, PMS concentration, initial pH, temperature, and MB solution concentration were systematically investigated to understand their influence on the catalytic performance. Furthermore, the influence of inorganic ions, humic acid (HA), and the reusability and stability of the catalyst was evaluated, demonstrating its potential for practical applications. Overall, this research provides valuable insights into the design and application of MOF-based catalysts for environmental remediation processes.
研究领域:
环境科学
·
催化
·
材料科学
·
化学工程
✓ 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）