SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jie Zhao,Yunning Chen,Renquan Guan,Xueying Cheng,Zhengkai Wu,Nana Zhao,Qingkun Shang,Yingnan Sun
In this paper, we successfully constructed two composite photocatalysts TiO 2 @PDI-NapSO 3 H and Fe-TiO 2 @PDI-NapSO 3 H by utilizing water-soluble PDI derivatives to bond with TiO 2 or iron-doped TiO 2 . Their photocatalytic performance to degrade phenol and diclofenac sodium (DCF) under visible light were investigated. The results show that PDI-NapSO 3 H can effectively improve the optical absorption properties of TiO 2 . Furthermore, the oxygen vacancy produced by doping of Fe in TiO 2 prevents the recombination of photogenerated carriers effectively. The larger conjugate plane of PDI-NapSO 3 H provides a convenient channel for the migration and separation of photogenerated carriers. Thus almost 99 % of phenol or DCF can be degraded by Fe-TiO 2 @PDI-NapSO 3 H within 90 or 120 min, respectively. However, the photocatalytic activity of Fe-TiO 2 @PDI-NapSO 3 H is better. The rate of phenol degradation is much higher than that of TiO 2 @PDI-NapSO 3 H. Further, through the photoelectric response characteristic analysis, radical trapping experiment and EPR test, the effects mechanism of the energy band structure, photogenerated carrier separation efficiency on the photocatalytic performance of Fe-TiO 2 @PDI-NapSO 3 H were discussed. In addition, the possible degradation pathways of DCF and the reasons for the obvious reduction of environmental toxicity after photocatalytic degradation were proposed.
研究领域:
环境科学
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材料科学
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化学
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2024
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IF 2.7
Ziwei Zhao,Qi Ling,Shangkun Deng,Ziliang Li,Jianguo Lv,Lei Yang,Chunbin Cao,Zhaoqi Sun,Miao Zhang
A type II heterostructured BiVO4/MIL-88B(Fe) composite was successfully synthesised for the photocatalytic degradation of tetracycline hydrochloride (TC-HCl) by a simple hydrothermal method. Thin film materials avoid secondary pollution of powder materials. The samples were characterised by XRD, SEM, TEM, XPS, UV-Vis DRS, and PL. The samples were also characterised for their optoelectronic properties. 3-BV/MIL-88B(Fe) (3 mmol BiVO4) was the most effective catalyst for the degradation of TC-HCl, achieving 92.1% removal at 75 min with a degradation rate constant of 22.79 × 10−3 min−1. Moreover, durability evaluation and TC-HCl degradation potential evaluation were also performed. We looked into how TC-HCl concentration, pH and ions affect the degradation results. In order to determine the active ingredients, experiments for trapping free radicals and EPR tests were performed. The results indicated that the main active species were h+ and ˙OH. It is proposed that a reasonable type-II heterostructure can help to explain the photocatalytic mechanism. The current study creates a stable photocatalytic system by compositing electrocatalytic and photocatalytic materials to achieve efficient antibiotic degradation and provides a viable strategy for future applications.
研究领域:
材料科学
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环境科学
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化学
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纳米技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Qin Yang,Yujie Zhang,Jie Liang,Yongsong Luo,Qian Liu,Yingchun Yang,Xuping Sun
Sulfate radical based advanced oxidation processes (SR-AOPs) are regarded as a promising technology to degrade organic pollutants in water. Here, hydrothermally synthesized Co-glycerate (Co-G) microspheres are proposed as an efficient heterogeneous catalyst to activate peroxymonosulfate (PMS) for degradation of refractory organic pollutant rhodamine B (RhB) in aqueous solution. The presence of Co-G microspheres enhanced the degradation rate significantly with a short full degradation time (8 min) and a total organic carbon (TOC) removal exceeding 41% (10 min), thus implying the excellent catalytic performance of Co-G microspheres for PMS activation. Furthermore, the effects of PMS and catalyst concentration, initial pH value and co-existing ions on RhB degradation were investigated. Radical quenching and EPR tests identify that active species including SO 4 - ·, HO·, O 2 - · and 1 O 2 are involved in the degradation process. Additionally, a possible reaction mechanism of PMS activation by Co-G microspheres for RhB degradation was suggested. This study can provide a new insight for design of cobalt-based heterogeneous catalysts as activators to activation PMS for pollutants degradation.
研究领域:
环境科学
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化学工程
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水处理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Lin Liu,Sen Lin,Wei Zhang,Usman Farooq,Genxiang Shen,Shuangqing Hu
Sulfachloropyridazine (SCP) has significant threat to natural environment and human health worldwide. Efforts have been made to remove SCP using traditional water treatment technologies but the outputs achieved are limited. In this study, we focused on heat-activated persulfate oxidation of SCP. Various factors have been investigated, such as PS concentration, initial pH, temperature and natural water constituent effects. The results showed that the SCP removal rate constants (k obs ) followed a quadratic relationship with initial persulfate concentrations (k obs = −1.526 ∗ 10 −6 [PS] 0 2 + 5.621 ∗ 10 −4 [PS] 0 + 0.01158, R 2 = 0.923, [PS] 0 = 17.5–280 µM) and excellent fitting with the Arrhenius equation (ln (k obs ) = −19487.9/T + 59.63, R 2 = 0.967, T = 303.15–323.15 K). The pH tests were applied at a wide range of 3.0–10.0, the quickest degradation rate observed at pH 3.0. The consumption rate of PS was strengthened at elevated temperatures, and 40 °C was determined to be an optimal condition. The presence of chloride (Cl − ), bicarbonate (HCO 3 − ) and humic acid all showed inhibitory effects. The radical scavenging experiments revealed that HO and SO 4 − were predominant oxidizing species responsible for SCP removal. These oxidizing species were further verified by EPR tests. LC-MS/MS analysis confirmed seven kinds of byproducts during the removal process which are mainly deriving from SO 2 extrusion/Smile-type rearrangement and S-N bond cleavage. Efficiencies of the antibiotics removal were over 85% when 50 g L −1 PS was added to piggery anaerobic fermentation slurry. This remediation technology may appear as a promising way for the removal of highly antibiotics-contaminated water in a small scale.
研究领域:
环境科学
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水处理
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化学工程
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分析化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Huaimin Wang,Shuang Meng,Zixuan Zhang,Chenying Zhou,Heng Zhang,Yang Liu,Chuan-shu He,Peng Zhou,Bo Lai
It has been reported that the ultrasonic agitation coupled system (US/A) has higher oxidation efficiency than the pure ultrasonic system (US), and the atomic hydrogen ( H) and hydroxyl radicals ( OH) produced by H 2 O cracking and in situ hydrogen peroxide (H 2 O 2 ) can be significantly detected. In order to utilize the residual H 2 O 2 and explore the role and fate of H, US/A/Fe(III) as an in situ Fenton oxidation system, was constructed in this study. The experimental results proved that the system can generate H 2 O 2 in situ , and adding Fe(III) could significantly promote the oxidation of refractory organic pollutants. Quenching tests, probes experiments and EPR test were performed to successfully monitor the existence of OH. The contribution of H to Fe(III) reduction was speculated and confirmed. In addition, the kinetic model showed the decomposition rate of water molecule and the reduction rate of Fe(III) by H under different ultrasonic power. The effects of the factors (pH, coexisting substance, and actual water environment) on degrading organic pollutants were evaluated. Therefore, this work provides new strategy and mechanistic insight into in situ Fenton technique by coupling ultrasonic agitation and Fe(III) without external oxidants.
研究领域:
环境科学
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化学工程
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水处理
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高级氧化过程
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产品关联
DOI
高影响因子
Journal of Chemistry
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2019
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IF 1.727
Juanjuan Zhao,Yujiao Sun,Fachao Wu,Minjian Shi,Xurui Liu
Antibiotic residues and antibiotic resistance genes (ARGs) pose a great threat to public health and food security via the horizontal transfer in the food production chain. Oxidative degradation of amoxicillin (AMO) in aqueous solution by thermally activated persulfate (TAP) was investigated. The AMO degradation followed a pseudo-first-order kinetic model at all tested conditions. The pseudo-first-order rate constants of AMO degradation well-fitted the Arrhenius equation when the reaction temperature ranged from 35°C to 60°C, with the apparent activate energy of 126.9 kJ·mol−1. High reaction temperature, high initial persulfate concentration, low pH, high Cl− concentration, and humic acid (HA) concentration increased the AMO degradation efficiency. The EPR test demonstrated that both ·OH and SO4·− were generated in the TAP system, and the radical scavenging test identified that the predominant reactive radical species were SO4·− in aqueous solution without adjusting the solution pH. In groundwater and drinking water, AMO degradation suggested that TAP could be a reliable technology for water remediation contaminated by AMO in practice.
研究领域:
环境科学
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化学工程
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水处理
✓ 已验证
产品关联
DOI
高影响因子
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