FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Haotian Li,Feng Liu,Shuhui Wang,Fengjia Wang,Xin Qian,Caiduan Zhang,Yongliang Ma,Lidong Wang
Based on advanced oxidation technology, a new method for the simultaneous removal of SO 2 and NO x from industrial flue gas using Na 2 S 2 O 8 /MgO was proposed. The method does not require the body structure of the wet desulfurization device is changed but adds Na 2 S 2 O 8 to the original equipment to realize simultaneous desulfurization and denitrification. After determining Cl − was additive, the effects of various reaction factors on the simultaneous removal of SO 2 and NO x were investigated, including the Cl − concentration, the initial concentration of the oxidant, the initial pH value of the solution, and the reaction temperature. According to the characterization of removal products and the types of free radicals involved in the reaction by XRD , XPS , and EPR , the reaction mechanism was elucidated. The experimental results indicated that the removal products were mainly sulfates and nitrates. The free radicals involved in the reaction were SO 4 ·− , ·OH, and Cl·, and the key free radical was Cl·.
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
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 9
·4272-4282
·
IF 3.925
Yu Lei,Huiqi Wu,Jianfeng Ma,Hao Cheng,Sridhar Komarneni
Layered α-Fe2O3/CuS nanoflowers with abundant active sites were synthesized by a hydrothermal method. The heterogeneous composite catalyst of α-Fe2O3/CuS nanoflowers exhibited a remarkable degradation capacity of 97.8% within 25 min for the Orange II (OII) dye under visible light, which was attributed to the synergistic effect of Na2S2O8 to generate ˙SO4− and ˙OH radicals. The initial pH tests revealed that this system showed better adaptability for its application in a wider pH range (pH = 3–9). In addition, the degradation of different azo dyes such as methylene blue (MB), Orange G (OG) and malachite green (MG) was also studied under the same conditions. The catalyst was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) to analyze its size, morphology, valence states of elements and chemical components. α-Fe2O3/CuS was further characterized using a vibrating sample magnetometer (VSM) and diffuse reflectance spectroscopy (DRS) to demonstrate its magnetic properties and light absorption capacity. Moreover, α-Fe2O3/CuS showed good recovery and reuse performance as a catalyst after four repeated cycles. A possible mechanism of degradation was proposed by quenching and ESR experiments, which revealed that the highly active species of ˙SO4−, ˙OH and ˙O2− enhanced the photocatalytic performance of the photocatalytic system.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2025
·Vol. 19
·期 4
·1-12
·
IF 4.5
Xing Xiangwen,Jiang Jingxuan,Liu Jing,Zhao Pei,Cui Lin,Dong Yong
The sodium persulfate (Na 2 S 2 O 8 )-urea system has been proven to be an excellent scrubbing solution for the wet removal of NO. Commonly, seawater is used as a wet carrier in marine applications. To further explore the feasibility of marine denitrification using Na 2 S 2 O 8 -urea system, this study proposed the Na 2 S 2 O 8 -urea-seawater composite redox system for NO removal from the marine exhaust gas. The effects of seawater carrier, reaction temperature, Na 2 S 2 O 8 concentration, urea concentration, pH value, and NO concentration on NO removal were investigated. Additionally, the NO 3 − concentration in the solution was measured. Results showed that the lowest normalized NO concentration was 0.099, with the corresponding mass of NO absorbed per unit volume of solution reaching 0.108 g·L −1 . The addition of seawater carrier and incremental reaction temperature, Na 2 S 2 O 8 , and urea concentration promoted the NO removal performance. When the pH value increased within the range of 4–7, the NO removal performance decreased. The NO removal performance increased as the pH value further increased to 8, but decreased again when the pH value increased to 11. An increase in NO concentration was detrimental to NO removal. The Cl − , HCO 3 − , and CO 3 2− in seawater could augment the total concentration of active free radicals to improve denitrification performance.
研究领域:
环境科学
·
海洋工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Hongyuan Xi,Song Zhou,Jinxi Zhou,Zhao Zhang
The novel combined system using Na 2 S 2 O 8 /urea was used to simultaneously absorb nitric oxide and sulfur dioxide emissions from marine diesel engines as well as inhibit the formation of nitrate in cleaning wastewater to meet the increasingly stringent requirements of regulations. The influences of reaction temperature, Na 2 S 2 O 8 concentration, urea concentration, SO 2 concentration, NO concentration and pH value on SO 2 removal efficiency, NO removal efficiency and nitrate concentration were investigated. The experimental results showed that different reaction temperatures had different influences on SO 2 removal efficiency, NO removal efficiency and nitrate concentration. An increase in Na 2 S 2 O 8 could improve the absorption of NO. The addition of urea could effectively improve the removal efficiency of NO and reduce the nitrate concentration. The removal efficiencies of 1000 ppm NO and 1000 ppm SO 2 achieved 100 % with 0.2 mol/L Na 2 S 2 O 8 and 2 mol/L urea at 70℃, and the nitrate content was 8.56 mg/L which was far lower than the regulatory requirement of 60 mg/L. The acidic condition (pH ≤ 5.5) not only facilitated the absorption of NO but also reduced the generation of nitrate. According to the experimental results, the novel combined system was promising to be applied to the control technology of marine diesel engine exhaust.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Yin Wang,Jiao Zhao,Xianmeng Liu,Xiaojia Tang,Tie Li,Yimin Zhu
Oily sludge not only seriously pollutes the ecological environment, but also endangers human health. Additionally, the complex properties pose significant challenges in its treatment. The single technology has limited capacity and poor treatment effect. Consequently, the combined technology is being developed due to the exceptional treatment effect. Herein, a new combined technology was proposed to treat oily sludge, which combined high-speed stirring cleaning with thermal-activated Na 2 S 2 O 8 oxidation. The bulk of petroleum pollutants were efficiently removed by high-speed stirring cleaning firstly, and the residual petroleum pollutants were decomposed by thermal-activated Na 2 S 2 O 8 . After treatment, the oil content of the oily sludge decreased from 13.81 % to 0.47 % with the removal rate of 96.6 % under the optimal conditions, which had reached the discharge and reuse standards. The high-speed stirring had remarkable removal effect on saturated hydrocarbons, aromatic hydrocarbons and resins. In addition to the three components mentioned above, thermal-activated Na 2 S 2 O 8 also had excellent removal effect on asphaltenes in the cleaned oily sludge based on the strong oxidation effect of SO 4 − · and OH·. This work demonstrates a new method to treat oily sludge efficiently, which not only reduces the burden of petrochemical industries and provides support for their green development, but also has important scientific significance for environmental protection and environmental management.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2020
·
IF 4.982
Hongyuan Xi,Song Zhou,Zhao Zhang
A novel method based on a Na 2 S 2 O 8 /urea composite system was used to both synchronously absorb SO 2 and NO from marine diesel engine emissions and reduce the nitrate residues in cleaning wastewater. In the Na 2 S 2 O 8 /urea solution, a temperature of over 60 °C and a Na 2 S 2 O 8 concentration of >0.05 mol/L were found to fully absorb SO 2 by overcoming the SO 2 release and effectively absorb NO. Urea successfully reduced the residual nitrate concentration and improves NO absorption at a concentration below 2 mol/L. The NO and SO 2 removal efficiencies reached 97.8 ± 1.5% and 100%, respectively, at 70 °C in 0.1 mol/L Na 2 S 2 O 8 and 1.5 mol/L urea solutions. The residual nitrate concentration was 8.12 ± 0.25 mg/L, far below the regulatory limit of 60 mg/L. Acidic conditions (pH ≤ 5.5) could be conducive to absorbing NO and reducing the residual nitrate concentration. Based on the experimental results, this novel method is highly promising for reducing ship emissions.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
OZONE-SCIENCE & ENGINEERING
·
2018
·
IF 1.232
Shengtao Jiang,Jianzhong Zhu,Zibo Wang,Min Ge,Huayue Zhu,Ru Jiang,Enmin Zong,Yujiang Guan
The nanosized Fe3O4 catalyst was synthesized via a modified reverse coprecipitation method and characterized by means of a scanning electron microscope (SEM) and an X-ray diffraction (XRD) analysis instrument. The degradation efficiency and reaction rate of Fe3O4 in activating sodium persulfate used to degrade ciprofloxacin were determined from the catalyst dosage, oxidant concentration, and initial pH. The results showed that under the optimum conditions of a catalyst dosage of 2.0 g·L−1, a sodium persulfate concentration of 1.0 g·L−1, and an initial pH of 7, the degradation rate of ciprofloxacin was 93.73%, the removal rate of total organic carbon was 78%, and the first-order reaction constant was 0.06907 min−1 within 40 min. It was also demonstrated that the reactive oxygen species in the Fe3O4/sodium persulfate catalytic system were mainly composed of SO4– and supplemented by OH· and HO2· using probe compounds such as ethanol, tertiary butanol, and benzoquinone.
研究领域:
环境科学
·
化学工程
·
高级氧化技术
·
纳米催化
·
水处理技术
✓ 已验证
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 85
·期 6
·1813-1823
·
IF 2.43
Zhong Dan,He Fu,Ma Wencheng,Wu Yichuan,Dong Jiaju
In this study, we investigated using the main composition of pipe deposits from water distribution networks as catalyst to activate dual-oxidant H 2 O 2 /Na 2 S 2 O 8 system to produce radicals for perchloroethylene and chloramphenicol removal. According to the results, the degradation efficiency of perchloroethylene by H 2 O 2 /Na 2 S 2 O 8 system was 92.05% within 8 h. Due to the slow conversion between ≡Fe 3+ and ≡Fe 2+ , the hydroxylamine was introduced to reduce reaction time. As for the results, the degradation efficiency of chloramphenicol in the H 2 O 2 /Na 2 S 2 O 8 system with hydroxylamine assistance was 73.31% within 100 min. Meanwhile, several key affecting factors and the kinetic models were investigated. The primary radicals were identified by electron paramagnetic resonance and radical scavenging tests. Eleven degradation products were confirmed by high-resolution liquid chromatography-mass spectrometry. The result of this study provided the theoretical basis for resource utilization of pipe deposits in water treatment in case of emerging contamination events.
研究领域:
环境科学
·
水处理
·
材料化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Hongyuan Xi,Song Zhou,Jinxi Zhou
NO is the main precursor of photochemical smog. Since the SCR system of marine diesel engines has many disadvantages, this paper proposes an effective wet method to remove NO from the exhaust gases of marine diesel engines. Experiments were performed in a bubble column reactor to study the absorption of NO using sodium persulfate (Na 2 S 2 O 8 )/urea ((NH 2 ) 2 CO) solutions from a simulated gas stream. The effects of various operating parameters on NO removal were investigated, including reaction temperature, urea concentration, Na 2 S 2 O 8 concentration and the initial pH value of Na 2 S 2 O 8 /urea solutions. The experimental results showed that the NO removal efficiency increased with increasing reaction temperature (25–80 °C) and increasing Na 2 S 2 O 8 concentration (0.01–0.2 mol/L). When the concentration of urea was higher than 0.5 mol/L at 60 °C, 1 mol/L at 70 °C or 2 mol/L at 80 °C, the NO removal efficiency increased with the increase of urea concentration (0.1–4 mol/L). The highest NO removal efficiency was 99.7%, occurring at 80 °C when the concentrations of Na 2 S 2 O 8 and urea were 0.1 mol/L and 4 mol/L, respectively, and the concentration of nitrate was 14.93 mg/L. The optimal urea conditions were well below the legal limit of 60 mg/L. The NO removal efficiency increased with the increase of initial pH value within the herein investigated range of 7–9. All the experimental data showed that the novel system not only achieved effective NO removal efficiency, but also reduced the nitrate in wastewater, which could thus be applied to denitrification of marine engine exhaust gases.
研究领域:
环境工程
·
大气污染控制
·
化学工程
·
海洋工程
·
能源与动力工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Zihao Hu,Huiqi Wu,Fang Zhu,Sridhar Komarneni,Jianfeng Ma
MIL-101(Fe)/Co 3 O 4 composites were synthesized using a facile solvothermal method to establish the superiority of a heterogeneous photochemical catalysis system in the presence of Na 2 S 2 O 8 with visible light irradiation. In the present system, the MIL-101(Fe)/Co 3 O 4 catalyst showed better catalytic performance than the single photocatalytic or chemical catalytic system, implying that the MIL-101(Fe)/Co 3 O 4 catalyst can combine both photocatalysis and chemical catalysis well. When tetracycline (TC) is the target pollutant, the highest degradation efficiency can be achieved within 40 min, reaching to 86 %. Crystallinity, morphology, and elemental valence of the MIL-101(Fe)/Co 3 O 4 composite were explored by using X-ray diffraction (XRD), scanning electron microscopy (SEM) as well as X-ray photoelectron spectroscopy (XPS). From the quenching experiments, it was found that 1 O 2 , SO 4 ‾, OH, and O 2 ‾ make contributions to the effective removal of tetracycline. Apart from that, the recovery and reuse characteristics of MIL-101(Fe)/Co 3 O 4 may facilitate the sustainable wastewater treatment.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Exploration
·
2023
·
IF 0
Yang Li,Jinyan Lin,Yueyang He,Kaiyuan Wang,Cailin Huang,Ruifeng Zhang,Xiaolong Liu
Traditional tumour-dynamic therapy still inevitably faces the critical challenge of limited reactive oxygen species (ROS)-generating efficiency due to tumour hypoxia, extreme pH condition for Fenton reaction, and unsustainable mono-catalytic reaction. To fight against these issues, we skilfully develop a tumour-microenvironment-driven yolk-shell nanoreactor to realize the high-efficiency persistent dynamic therapy via cascade-responsive dual cycling amplification of •SO 4 − /•OH radicals. The nanoreactor with an ultrahigh payload of free radical initiator is designed by encapsulating the Na 2 S 2 O 8 nanocrystals into hollow tetra-sulphide-introduced mesoporous silica (HTSMS) and afterward enclosed by epigallocatechin gallate (EG)-Fe(II) cross-linking. Within the tumour microenvironment, the intracellular glutathione (GSH) can trigger the tetra-sulphide cleavage of nanoreactors to explosively release Na + /S 2 O 8 2 − /Fe 2+ and EG. Then a sequence of cascade reactions will be activated to efficiently generate •SO 4 − (Fe 2+ -catalyzed S 2 O 8 2 − oxidation), proton (•SO 4 − -catalyzed H 2 O decomposition), and •OH (proton-intensified Fenton oxidation). Synchronously, the oxidation-generated Fe 3+ will be in turn recovered into Fe 2+ by excessive EG to circularly amplify •SO 4 − /•OH radicals. The nanoreactors can also disrupt the intracellular osmolarity homeostasis by Na + overload and weaken the ROS-scavenging systems by GSH exhaustion to further amplify oxidative stress. Our yolk–shell nanoreactors can efficiently eradicate tumours via multiple oxidative stress amplification, which will provide a perspective to explore dynamic therapy.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤学
✓ 已验证
DOI
Journal of Water Process Engineering
·
2022
·
IF 7.34
Xi-Qi Li,Wen-Zong Liu,Ai-Jie Wang,Xiang-Yu Gao,Yu Tao,Xiao-Li Ge,Zhen Lin
Ink wastewater is hazardous because it contains oil and refractory pollutants, with high Chroma and turbidity . There are many aromatic compounds in the wastewater, such as benzene, toluene, xylene, and phthalocyanines, azos, and nitroso, which make high chemical oxygen demand (COD) and ammonia nitrogen content. The refractory pollutants are always encapsulated in diverse oil-water systems. Usually a massive degreaser has to be used to destroy the dispersant oil forms under preferred alkaline condition, and advanced oxidation is used for good removal of refractory pollutants under preferred acid condition, which commonly lead to a bad coagulation and sedimentation as a result. In this study, the nano-Fe 3 O 4 (MNPs) activated sodium persulfate (SPS) has been testified to enhance degrease with efficient coagulation and sedimentation. The results showed that the removal of oil, COD, ammonia nitrogen, Chroma and turbidity reached respectively 96.40%, 98.35%, 88.00%, 99.70% and 98.22%, within 40–50 min. The mechanism shows that the catalytic oxidation significantly decreased the Zeta potential of the colloidal particles in the wastewater, which destroyed the steady-state of the colloid and enhanced the effect of coagulation sedimentation. Importantly, the combination of MNPs and colloidal particles successfully promoted the simultaneous production of SO 4 − and a large amount of HO under weakly alkaline (pH = 7.5–8.0) conditions, which made synergistic oxidation to remove micro-oil and organic pollution efficiently.
研究领域:
环境科学
·
污水处理
·
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）