Journal of Water Process Engineering
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2025
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IF 6.7
Jiawei Hu,Shaogang Hu,Jing Zhang,Xiangqian Xu,Jie Wu
This study proposed a novel pretreatment technology by combining thermal hydrolysis (TH) with calcium hypochlorite (CH) to promote sludge anaerobic digestion (AD) performance. Experimental results indicated that the optimum pretreatment condition was TH at 70 °C combined with 0.08 g/g volatile suspended solids (VSS) of CH, by which the methane production of 260.1 mL/g VSS was achieved, 59.1 % higher than control group. Kinetic analysis revealed that methane production potential enhanced from 158.9 to 257.0 mL/g VSS after TH + CH pretreatment, and methane production rate accordingly increased from 13.10 to 27.97 mL/g VSS/d. Mechanism analysis illustrated that both extracellular polymeric substances and microbial cells were damaged by TH + CH method, resulting in substantial increase of hydrolysis efficiency. Microbial analysis revealed that the abundances of hydrolytic, acidogenic and methanogenic microbes were all enhanced under co-treatment condition, with the total abundances calculated to be 12.33 % and 22.68 % in control and TH + CH pretreated reactors, respectively.
研究领域:
环境工程
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微生物学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 13
·2337-2343
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IF 3.741
Tang Qin,Yang Tingting,Huang Yuming
Copper nanoclusters (Cu-NCs) were fabricated by chemical reduction of Cu(II) ions using formaldehyde as the reductant and poly(vinyl pyrrolidone) as the protecting agent. The resulting Cu-NCs were characterized by TEM, FT-IR, UV–vis and XPS and fluorescence spectroscopy. The Cu-NCs display a luminescence quantum yield of about 13 %, and the emission peaks shift from 398 to 457 nm on increasing the excitation wavelength from 310 to 390 nm. The Cu-NCs possess a storage stability of at least 2 months and are stable in the presence of high concentrations of salt. Their fluorescence is strongly quenched by hypochlorite, while other common cations, anions and hydrogen peroxide have minor (or no) effects on fluorescence. On this basis, a fluorometric hypochlorite assay was developed that has a 0.1 μM detection limit and a linear range that extends from 1 to 30 μM. The method was successfully used to the determination of hypochlorite in local tap water samples, and the results agreed well with those obtained by a colorimetric method.
Hypochlorite ion is found to quench the fluorescence copper nanoclusters synthesized by reduction of Cu(II) ion by formaldehyde in the presence of poly(vinyl pyrrolidone) serving as protecting agent. This finding resulted in a new fluorescence assay for hypochlorite.
研究领域:
分析化学
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环境科学
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生物医学
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高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 13
·2723-2728
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IF 1.915
Yongming Guo,Lianfeng Zhang,Fengpu Cao,Lianghong Mang,Xiaoling Lei,Shengjuan Cheng,Jintong Song
A facile, sensitive and selective method for the fluorescent detection of hypochlorite in tap water has been developed by utilization of blue-emissive silicon quantum dots (SiQDs) with a quantum yield of 10.6%. The SiQDs are prepared via a simple hydrothermal treatment of (3-aminopropyl)trimethoxysilane and sodium citrate, and they display excellent stability in high salt conditions. The proposed preparation method for SiQDs does not require complicated synthesis and does not need the protection of an inert gas. It is attractive that the as-prepared SiQDs can be utilized to detect hypochlorite in tap water with relatively good selectivity and sensitivity, and as low as 0.01 μM hypochlorite could be successfully determined.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
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2021
·Vol. 31
·期 4
·1125-1132
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IF 2.217
Wu Chuqiao,Lin Xin,Wang Qianming
The new design strategy will provide the possibility for preparing a dynamic sensor by employing the inhibition of C = N isomerization. In this work, the functional probe 4-(1 H-imidazo [4,5-f] [1,10]-phenanthrolin-2-yl) benzaldehyde oxime (compound 4 ) has been synthesized and such molecule gives rise to blue emission. Due to the incorporation of hypochlorite, the oxime group can be oxidized to the structure of aldehyde. As a result, the molecular motif exhibits sharp emission change from blue to green due to the addition of hypochlorite with enough sensitivity and selectivity (detection limit = 53 nM, linear range 0.5-8.0 µM). It has also been used for monitoring ClO − by employing solution color change and the absorption signal difference could effectively rule out the effects of interference species. To our knowledge, it will be the first case of a highly selective hypochlorite sensor derived from oxime isomerization reaction based on phenanthroline backbone.
研究领域:
化学
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分析化学
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生物医学
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DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2023
·
IF 4.8
Shangyong Lin,Hongliang Zhang,Xiangsong Meng,Ruolin Wang,Wei Sun,Haisheng Han,Chenyang Zhang
Molybdenite and bismuthinite are valuable components arising from Mo–Bi sulfide ore, and their recoveries are considerably limited by separation efficiency. Herein, calcium hypochlorite (Ca(ClO) 2 ) was first introduced as bismuth depressant for efficient separation of molybdenite and bismuthinite, and its depression mechanisms were investigated through a series of analytical techniques supplemented with solution chemistry and thermodynamic calculations. Flotation results showed that Ca(ClO) 2 had a stronger depressing ability than conventional depressant sodium sulfide and exhibited superior selectivity for bismuthinite against molybdenite. At pH around 8.0, the high-selective separation of Mo–Bi bulk concentrate was realized, where more than 96% of molybdenite was recovered and over 98% of bismuthinite was depressed. Solution chemistry and thermodynamic analysis indicated that the bismuthinite surface was preferentially oxidized by Ca(ClO) 2 to SO2- 4 and Bi 3+ . The former dissolved into solution and existed as stable ions, whereas the Bi 3+ further interacted with Cl − and was hydrolyzed as BiOCl precipitates. Surface analysis demonstrated that the deposition of BiOCl on the bismuthinite surface not only made its surface rougher but also enhanced its surface hydrophilicity. In comparison, the surface of molybdenite was slightly oxidized and it remained hydrophobic as confirmed from scanning electron microscopy with energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy, and contact angle results. The difference in surface characteristics resulted in the selective adsorption of collector on the surface of molybdenite rather than that of bismuthinite, thus improving the floatability of molybdenite and drastically deteriorating the floatability of bismuthinite. This work suggests that Ca(ClO) 2 could be a promising depressant for bismuthinite in the flotation separation of Mo–Bi sulfide ore.
研究领域:
矿物加工工程
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材料科学与工程
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DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jiawei Hu,Shaogang Hu,Yueming Han
For existing advantages in resource recovery and cost, anaerobic digestion (AD) is considered a proper technology to treat sludge. The insufficient efficiency of sludge AD however prevents its further application. This work reported a hybrid method by combining calcium hypochlorite (CH) with ultrasound (US) for sludge pretreatment to enhance the AD performance. Experimental data demonstrated that the optimal parameters of this co-treatment were CH at 0.08 g/g volatile suspended solids (VSS) coupled with US intensity of 1.0 W/mL, and relevant biomethane yield was 263.4 mL/g VSS, 15.2 %, 23.1 % and 56.6 % higher than individual CH, individual US and control, respectively. Simulation results showed that methane production potential and rate both increased under CH + US condition. Mechanism analysis indicated that abundant dissolved organic matters were generated through high-efficiency hydrolysis when sludge was treated with CH + US, because extracellular polymeric substances (EPS) and microbial cells were both sufficiently disrupted in treatment process. Gene analysis revealed that functional microbes were generally enriched by the co-treatment, and their total abundance markedly improved from 11.89 % to 24.87 % under CH + US condition.
研究领域:
环境工程
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微生物学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2025
·
IF 11.3
Yuheng Chen,Longjie Cheng,Pavel Nesterenko,Boqiang Li,Haolin Yang,Xiao Li,Lan Li,Baiyang Chen
Free chlorine (FC), primarily existing as hypochlorite anion in alkaline water (pK a 7.5), could theoretically be analyzed by an ion chromatography (IC) system. However, the feasibility of direct FC detection by IC remains controversial in previous researches. To address this issue, this study systematically examined the fate of FC under varying IC eluent pH, anion exchange column (AEC) types, detectors, and suppression conditions. The results ultimately disprove it and show that the primary obstacle to direct FC analysis with IC system is its transformation: 31 %–41 % became Cl - and 59 %–69 % became immobile organic chloramines in AEC, due to its reaction with quaternary ammonium compounds (QACs) in AECs. Moreover, IC analysis of Cl - might be interfered by coexisting FC, although FC concentrations are typically much lower than Cl - . Eluent suppressor can also consume FC even when residual FC after AEC is limited. In contrast, variations in water pH do not affect FC stability, and a UV detector effectively distinguishes FC from other anions. This study hence for the first time elucidates several FC consumption mechanisms in IC system, which represent key barriers hindering FC analysis by IC, and accordingly provide some guidance on future efforts to develop novel AEC to overcome these barriers.
研究领域:
环境科学
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分析化学
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Jinxiu Lou,Wei Wang,Huijie Lu,Lin Wang,Lizhong Zhu
Intensified use of disinfectants to control COVID-19 could unintentionally increase the disinfection byproducts (DBPs) in the environment. In indoor spaces, it is critical to determine the optimal disinfection practice to prevent the spread of the virus while keeping DBPs at relatively low levels in the air. The formation of DBPs exceed 0.1 μg/mg while hypochlorite dosed at >10 mg/m 3 . The total DBP concentrations in highly disinfected places (100–200 mg/m 3 hypochlorite) were as high as 66.8 μg/m 3 , and the Hazard Index (HI) was up to 0.84, and both values were much higher than those in less disinfected places (<10 mg/m 3 hypochlorite). Taking into account the HI, formation yields and the origin of the DBPs, we recommended 10 mg/m 3 as the suggested hypochlorite dose to minimize DBPs generation during routine disinfection for controlling the coronavirus. DBPs in indoor air could be eliminated by ventilation, reducing the usage of personal care products, and wiping the solid surface with water before or after disinfection. These results highlighted the necessity to control air-borne DBPs and their associated health risks arising from intensified disinfection, and will guide the further development of evidence-based regulation on DBP exposure during disinfection and improve public health protection.
研究领域:
环境科学
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公共卫生
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毒理学
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DOI
PubMed
高影响因子
LUMINESCENCE
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2019
·Vol. 34
·期 8
·903-910
·
IF 1.691
Huan-ren Cheng,Yan Ji,Fei Liu,Xiao-ju Lu
In this paper, a new ‘turn-on' fluorescence probe for the rapid, sensitive, and visual detection of hypochlorite is reported. The push–pull type trianiline–tricyanofuran-based fluorescent probe was prepared using a condensation reaction between tricyanofuran and the thiophene–trianiline derivative that had high quantum yields and showed aggregation-induced emission enhanced properties. Upon exposure to hypochlorite, prominent fluorescence enhancement of the probe was observed via the release of the fluorophore from the probe. The probe showed a ratiometric absorption change at 315 nm and 575 nm. Importantly, the probe showed an excellent detection limit for hypochlorite at 1.2 × 10 −7 M in solution and it was successfully applied for monitoring hypochlorite in waste water by test strip. This work reports a new fluorescence analytical sensing method for hypochlorite that has potential practical value in environmental monitoring and biological discrimination.
研究领域:
分析化学
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环境科学
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生物医学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Jiawei Hu,Zhuo Li,Wenquan Tao
This study reported a high-efficiency and low-cost sludge pretreatment method using calcium hypochlorite [Ca(ClO)2] for promoting anaerobic fermentation performance. The experimental results indicated that the cumulative hydrogen yield was enhanced from 1.87 to 16.72 mL/g volatile suspended solids (VSSs) when the Ca(ClO)2 dosage was increased from 0 to 1.5 g/L and then reduced to 13.80 mL/g VSSs when the Ca(ClO)2 dosage reached 1.8 g/L. The mechanism study revealed that Ca(ClO)2 efficiently disrupted sludge extracellular polymeric substances and microbial cells, producing more soluble organics for the subsequent biochemical processes. Beyond that, the biodegradability of sludge organics was promoted by Ca(ClO)2 pretreatment. Biochemical reaction kinetic analysis indicated that the activities of microbes responsible for hydrogen consumption were severely inhibited when treated with Ca(ClO)2. The two decomposition products of Ca(ClO)2, Ca(OH)2 and HClO, positively affected the hydrogen yield, with the contribution of Ca(OH)2 being greater than HClO. Microbial community analysis illustrated that the fermentative microbes were markedly enriched by Ca(ClO)2 pretreatment, with the abundances found to be 3.21 and 45.62% in control and Ca(ClO)2-pretreated fermenters, respectively. After fermentation, the Ca(ClO)2-pretreated sludge showed better dewaterability than the control, and the organic pollutants diclofenac and sulfamethazine, as well as the fecal coliforms, were largely removed by Ca(ClO)2.
研究领域:
环境生物学
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废水处理
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微生物学
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DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Yuyang Luo,Shiyu Zheng,Congcong Dong,Haojie Yu,Kunming Liu,Juanhua Li,Jinbiao Liu
An innovative dual-modal colorimetric and fluorometric probe MDXM is synthesized based on the dihydro-1 H -xanthene motif via Knoevenagel reaction. The incorporation of a malononitrile group into the dihydro-1 H -xanthene motif via a double bond results in an extensive macroconjugated π-system, which endows MDXM with a pronounced molar absorptivity and effectively quenches the intramolecular charge transfer (ICT) effect. Upon exposure to hypochlorite, the C = C bond in MDXM undergoes cleavage, resulting in the formation of an aldehyde group. This process restores the ICT effect and manifests as a clear fluorescent ''turn-on'' signal at 530 nm, with a remarkably linear response across the ClO − concentration range of 0–60 μM. The probe achieves a notably low detection limit of 7.14 nM, reflecting its exceptional sensitivity. In the presence of 15 common metal ions and oxidizing agents, MDXM can specifically identify hypochlorite with excellent anti-interference ability. The response mechanism of MDXM to hypochlorite was confirmed through Nuclear Magnetic Resonance (NMR) spectroscopy and computational Density Functional Theory (DFT) calculations. The practical applicability of MDXM is underscored by its successful implementation in analyzing hypochlorite in 5 varied real water samples. This showcases MDXM' s promise for environmental and analytical chemistry, providing a robust tool for hypochlorite detection in diverse settings.
研究领域:
分析化学
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环境科学
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生物医学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 18
·8155-8165
·
IF 3.591
Xiaoye Wen,Li Yan,Zhefeng Fan
As the environmental residues of formaldehyde and hypochlorites are very harmful to human health, a new simple and efficient aggregation-induced emission probe based on diaminomaleonitrile was designed and applied in the independent detection of hypochlorites and formaldehyde. The probe shows high selectivity and anti-interference ability against other potential competitive substances. ClO− promotes the oxidized splitting of CN in the probe, and induces evident color changes visible to the naked eye together with quenched fluorescence. The detection of ClO− by this probe was fast, sensitive, and visible to the naked eye. The detection limit of the probe to ClO− in the range of 0.70–20 μM is 18 nM. Through the condensation mechanism and with amine as the binding site of formaldehyde, the exposed amino group in the probe structure responds sensitively and efficiently to formaldehyde. The probe can effectively monitor 0.50–25 μM formaldehyde in aqueous solutions, with a detection limit as low as 42 nM. A portable solid sensor – a formaldehyde detection plate was built by directly covering the probe on a thin-layer chromatography plate. Thereby, formaldehyde gas can be effectively and sensitively detected, which offers a clue for developing solid-state formaldehyde-detection plates. The high experimental recovery rates prove that this new probe is highly promising in hypochlorite detection in the real water environment.
研究领域:
分析化学
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环境科学
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生物医学
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DOI
高影响因子
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