Water
·
2021
·Vol. 13
·期 11
·1543
·
IF 3.103
Cancan Xu,Rui Liu,Wei Zheng,Lichu Lin,Lvjun Chen
Pd/Fe bimetallic particles were synthesized by chemical deposition and used to remove absorbable organic halogens (AOX) in the activated sludge of a chemical dyestuff wastewater treatment plant. Bath experiments demonstrated that the Pd/Fe bimetallic particles could effectively remove AOX. It indicated several factors, such as Pd loading, the amount of Pd/Fe used, initial activated sludge pH, and reaction time, which could affect the removal effect. The results showed that increasing the Pd content in Pd/Fe particles, from 0.01 to 0.05 wt %, significantly increased the removal efficiency of AOX in activated sludge. The Pd/Fe particles had a much higher removal efficiency of AOX in the activated sludge than bare Fe particles. A slightly acidic condition with a Pd content of 0.05% and 10 g/L of Pd/Fe was beneficial to the process of removing AOX in activated sludge. In detail, the removal efficiency of AOX in the activated sludge could reach 50.7% after 15 days of reaction with 10 g/L of Pd/Fe (Pd loading 0.05 wt %) and at an initial pH of 6.0 during the experiments. It also showed that the control samples without Fe0and Fe/Pd additions only removed 7.9% of AOX under the same conditions. Meanwhile, the concentrations of AOX in the supernatant of activated sludge were lower than the initial AOX concentration in the supernatant during the activated sludge remediation with Pd/Fe bimetallic particles. The results indicated that the AOX removal from the activated sludge matrix might be mainly due to the Pd/Fe bimetallic particles, and not just by phase transfer.
研究领域:
环境科学
·
废水处理
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Chenyan Zhou,Qing Liu,Jie Xie,Jinli Li
In this study, pyribencarb-resistant mutants were generated through fungicide mutagenesis, and the parental isolate SBH1 and three representative mutants (RH1-1, RH1-2, and RH1-3) were selected for comparative analysis. All mutants displayed reduced mycelial growth, impaired sclerotia formation, decreased respiration, and mitochondrial dysfunction, with elevated cell membrane permeability. No differences were detected in sclerotia weight, oxalate levels, or pathogenicity relative to the parental isolate. RH1-3 exhibited distinct morphological abnormalities, including distorted mycelia, damaged organelles, and enlarged mitochondria. Pyribencarb sensitivity showed a strong positive correlation with azoxystrobin but a negative correlation with dimetachlone. Sequence analysis revealed no mutations in the QoI-targeted cytochrome b (Sscytb) and alternative oxidase (Ssaox) genes. Quantitative reverse transcription polymerase chain reaction (RT-PCR) revealed significant upregulation of Ssaox expression in mutants relative to SBH1, with unchanged Sscytb levels, as confirmed by protein expression analyses. Molecular docking identified a strong binding affinity of pyribencarb to SsAox domains. These results indicate that Ssaox overexpression confers pyribencarb resistance in Sclerotinia sclerotiorum.
研究领域:
植物病理学
·
真菌学
·
真菌遗传学
·
生物化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Water
·
2025
·Vol. 17
·期 17
·2563
·
IF 3
Chao Feng,Tongyu Liu,Yongping Shi,Jimin Shen,Lei Yuan,Yuanqing Guo
The interaction of disinfectants with bromide/iodide ions and natural organic matter (NOM) generates brominated/iodinated disinfection byproducts (Br/I-DBPs), known for their heightened cytotoxicity and genotoxicity relative to chlorinated DBPs. This study investigated Br/I-DBP formation during sodium hypochlorite (NaClO) disinfection of lignin-containing synthetic water by quantifying adsorbable organic halogens (AOX) and trihalomethanes (THMs). Disinfection of bromide-containing water yielded a bromide ion (Br−) to adsorbable organic bromine (AOBr) conversion rate of approximately 60%, with bromine within THMs accounting for about 30% of the total AOBr, indicating significant brominated DBP formation where THMs represent a major fraction. Conversely, iodide ion (I−) conversion to adsorbable organic iodine (AOI) is minimal, suggesting negligible iodinated DBP formation under NaClO disinfection. Examination of key parameters revealed that brominated THM (Br-THM) formation decreased with increasing lignin concentration, while iodinated THM (I-THM) formation increased. The effect of chlorine dose differed: Br-THM formation exhibited an initial increase followed by a decrease at higher doses, whereas I-THM formation consistently decreased. Both Br-THM and I-THM formation increased with higher bromide or iodide ion concentration and with increasing pH. These results highlight the distinct pathways and influencing factors governing brominated versus iodinated DBP formation in lignin-containing waters disinfected with hypochlorite.
研究领域:
环境科学
·
水处理
·
消毒副产物
·
毒理学
·
天然有机物化学
✓ 已验证
产品关联
DOI
高影响因子
AIP Advances
·
2021
·Vol. 11
·期 11
·
IF 1.548
Huang Lijie,Wei Zhehao,Wang Yanan,Han Xiaoxue,Chen Haobin,Huang Chongxing,Wei Yingnan
In this paper, the effect of D 0 temperature, Kappa factor and the final pH value on bleaching sulfate bleached pine wood pulp was studied. The results showed that the bleaching efficiency was better when the pH value was 4, and the amount of absorbable organic halogen (AOX) in the bleaching wastewater was decreased. The Kappa factor is linear with the whiteness in the range of 0–0.15. With the increase of the Kappa factor, the amount of AOX in bleaching wastewater of D 0 and Ep gradually increases. High temperature bleaching can reduce AOX production, but some fibers are hydrolyzed, leading to a decrease in pulp viscosity. The effects of chlorine dioxide solution adding sodium dihydrogen phosphate (NaH 2 PO 4 ) and dimethylsulfoxide (DMSO) on pulp bleaching were investigated. The results showed that both solutions could reduce the amount of AOX in bleaching wastewater. Among them, the addition of NaH 2 PO 4 in chlorine dioxide increased pulp whiteness, while the addition of DMSO was the opposite. Scanning electron microscope showed that a small amount of hollow cracks and more voids appeared on the surface of pulp fibers after the addition of NaH 2 PO 4 . Pulp fibers bleached by the chlorine dioxide adding DMSO have more folds and less voids on the surface. The surface wrinkles of pulp fibers increased with the addition of DMSO and the voids were less. FT-IR showed that the number of chromophore groups in the pulp bleached by chlorine dioxide adding NaH 2 PO 4 were decreased. However, the lignin characteristic absorption peak in the pulp bleached by chlorine dioxide adding DMSO increased at the intensity of 1062 and 1160 cm −1 , which indicated that there were more residual chromophore groups.
研究领域:
制浆造纸工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2020
·Vol. 14
·期 1
·20-28
·
IF 1.126
Lei Ming,Luo Bin,Zhang Qingtong,Guo Chenyan,Chi Mingchao,Yun Xiaojing,Min Douyong,Wang Shuangfei
Herein, residual lignin was extracted from unbleached sugarcane bagasse pulp via the sequential enzymatic-weak acid hydrolysis method. Subsequently, chlorine dioxide delignification was applied to the extracted lignin. The structural changes of lignin during chlorine dioxide delignification
were characterized by Fourier transform infrared spectroscopy (FT-IR), 13C-nuclear magnetic resonance (13C NMR), 1H-13C heteronuclear single quantum coherence (2D HSQC), and quantitative 31P-nuclear magnetic resonance (31P-NMR)
spectroscopy. The degradation products of lignin dissolved in the simulated bleaching liquor, extracted, and quantified via gas chromatography-mass spectrometry (GC-MS). Lignin was significantly degraded during the delignification process, showing cleavage of the aromatic ring, removal of
the methoxyl group, and cleavage of major interunit linkages. However, the carboxylic acid content increased and GC-MS analysis indicated that lignin was degraded into several organic substances dissolved in the liquor. However, only a few absorbable organic halides (AOX) were generated, confirming
that chlorine dioxide bleaching is an ideal bleaching method.
研究领域:
植物化学
·
制浆造纸工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xiao Zhao,Baojie Liu,Hao Xu,Chengrong Qin,Shuangquan Yao,Chen Liang,Shuangfei Wang
Elemental Chlorine-Free (ECF) bleaching is a globally prevalent pulping technology that primarily utilizes chlorine dioxide (ClO 2 ) as a bleaching agent. However, the chlorination side reactions during ECF bleaching lead to the formation of chlorinated adsorbable organic halides (AOX), which are difficult to degrade and pose a potential threat to the ecological environment. This study presents a novel high-concentration ClO 2 pulping bleaching technology at room temperature, which effectively suppresses the chlorination side reactions through the strong oxidizing properties of high-concentration ClO 2 , thereby achieving both bleaching and a reduction in AOX generation. The results indicate that high concentrations of ClO 2 efficiently removed residual lignin from the pulp, promoted the cleavage of lignin ether bonds, and had no adverse impact on the strength or crystalline structure of the cellulose. The amount of AOX was effectively controlled to 0.41 kg/t pulp. Kinetic analysis demonstrated that the degradation of lignin in this bleaching system follows first-order reaction kinetics, with an activation energy of 1310.78 J/mol. Approximately 95 % recovery of the ClO 2 solution was achieved through a four-step reabsorption method. This technology advances the development of pulping and bleaching techniques and provides theoretical guidance for the innovation of cleaner pulping and papermaking technologies.
研究领域:
制浆与造纸工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Min Lei,Qian Gao,Kemeng Zhou,Parikshit Gogoi,Jing Liu,Jiabao Wang,Hainong Song,Shuangfei Wang,Xinliang Liu
Adsorbable organic halogens (AOX) are used as a parameter to determine the total amount of organic halogens in the environment. 4-chlorophenol (4-CP), as a type of AOX, can persist in the environment for a long time and is not biodegradable. 4-CP has significant carcinogenic and teratogenic effects on humans and animals. In this study, a catalytic system employing phosphomolybdic acid (PMA) and hydrogen peroxide (H 2 O 2 ) was developed for degrading 4-CP. The degradation and the mechanisms of 4-chlorophenol (4-CP) as an AOX simulant was investigated. The removal efficiency of 4-CP, the AOX content, and total organic carbon were used to evaluate its molecular structure. The results show that 4-CP was fully converted, 19.81% to other species of AOX and 44.52% to CO 2 and H 2 O. Moreover, the intermediates were detected and analyzed, and the possible pathways of 4-CP degradation were drawn. 4-CP attached to PMA, there by leading to ring-opening or dichlorination, and the generation of some other chemical species, such as phenol , benzoquinone, cyclohexanone, 4-chlorohexa-2,4-dien-1-ol, and 3-chlorohexa-2,4-diene-1,6-diol. These species would then be mineralized under the effects of free radicals. PMA can promote the formation of free radicals and shows exceptional efficiency in the degradation of 4-CP.
研究领域:
环境化学
·
催化
·
水处理
·
污染物降解
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Liyuan Wu,Chenjing Hou,Xin Wang,Pengpeng Guo,Xiaoran Zhang,Yi Jin,Yongwei Gong,Xudan Chen,Haiyan Li
The presence of chloride ions (Cl − ) in dye wastewater can hinder the peroxymonosulfate (PMS) oxidation and lead to the abundant production of toxic adsorbable organic halogens (AOX). In this study, we investigate the detailed influence of Cl − on Rhodamine B (RhB) removal and its mechanism, and propose a potential pathway for 1 O 2 -dominated systems to inhibit AOX formation. The concentration of Cl − has a dual effect on the degradation of RhB, with low concentrations inhibiting and high concentrations promoting. Further studies have revealed that Cl − significantly impact the generation and transformation of reactive oxygen species (ROSs). EPR capturing, quenching tests, and molecular probe experiments indicate that as the Cl − concentration increases, the concentration of SO 4 − , OH and their contribution to the degradation of RhB gradually decrease, 1 O 2 slightly increase and then decrease, while HClO and chlorine radicals increase linearly. Additionally, the catalyst plays a crucial role in inhibiting AOX formation and improving the mineralization of RhB. On the one hand, introducing catalysts can alter the proportion of ROSs production. On the other hand, the in-situ generation of H 2 O 2 on the catalyst surface, through O 2 adsorption at sulfur vacancies sites, consumes the produced HClO, thereby inhibiting the formation of AOX. This study proposed a new insight into the mechanism for effective reduction of AOX content for 1 O 2 dominated non-radical PMS activation under saline water.
研究领域:
环境科学
·
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）