ADVANCED POWDER TECHNOLOGY
·
2025
·
IF 4.2
Jingjing Zou,Yiping Sun,Shuo Liang,Zhongrui Shi,Guanghe Li,Chunbin Guo
This study introduces a novel process for recovering Al 2 O 3 from coal fly ash (CFA), utilizing potassium persulfate (K 2 S 2 O 8 ) as an activator, and explores the decomposition behavior of both crystalline and amorphous alumina phases within CFA. The experiment involved mixing K 2 S 2 O 8 with CFA in K 2 S 2 O 8 /Al 2 O 3 molar ratios ranging from 0.5:1 to 4:1, followed by calcination at varying temperatures and durations to optimize alumina extraction. The results indicated that the alumina extraction efficiency of 91 % was achieved with a molar ratio of 3:1 (K 2 S 2 O 8 /Al 2 O 3 ), calcination temperature of 405 °C, and reaction time of 2 h. X-ray photoelectron spectroscopy, scanning electron microscopy, and reaction kinetics were employed to analyze the reaction mechanism. The findings revealed that K 2 S 2 O 8 preferentially reacted with the amorphous alumina phase, leading to the breakage of Al–O–Si bonds. The release of SO 2 and O 2 during the reaction further facilitated the breakdown of the crystalline phase by disrupting aluminum–oxygen tetrahedra. Simultaneously, the silicon-oxygen tetrahedra decomposes and forms SiO 2 gel layer, wrapping the remaining aluminum oxygen octahedron, thus preventing further alumina extraction. This study contributes to a deeper understanding of the decomposition behavior of crystalline and amorphous alumina phases in CFA during sulfate roasting. The findings provide a theoretical foundation for refining alumina recovery processes and offer significant improvements to existing sulfate roasting methods.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yangchen Zhu,Fei Wang,Beihai Zhou,Huilun Chen,Rongfang Yuan,Yiyue Zhang,HuanHuan Geng,Yuxin Liu,Hao Wang
Sulfadiazine (SDZ) entering the environment has an adverse impact on animal, plant, and human health, it is important to find effective ways to remove SDZ from the aquatic environment. This work comprehensively explored the degradation of SDZ by MoS 2 in photocatalysis and Fe 2+ activation of potassium peroxodisulfate (PDS) from both theoretical and experimental aspects. The PDS/Fe 2+ /MoS 2 system had a faster PDS conversion rate and a higher degradation efficiency for SDZ compared with PDS/Fe 2+ and PDS/MoS 2 . The degradation rate of the PDS/Fe 2+ /MoS 2 system to SDZ reached 97.1% within 60 mins. The degradation rate is higher under acidic conditions compared with alkaline conditions. Free radical capture experiments and EPR tests showed that the degradation of SDZ was the result of a variety of free radicals, among which the SO 4 · − , 1 O 2 and h + played a major role. The chemical morphology and composition of MoS 2 , as well as the changes in the concentration of Fe ions in different valence states were explored and the changes in the O-O and, S-O bond lengths, and differential charge density of PDS in the MoS 2 and, Fe 2+ /MoS 2 systems were calculated by DFT. The results showed that both MoS 2 and Fe 2+ significantly increased the conversion rate of PDS. The activation of PDS on the Fe-modified MoS 2 surface had stronger active sites. MoS 2 can promote the cycle of Fe 3+ /Fe 2+ and the conversion of PDS. According to the intermediate products measured by LC-MS/MS, as well as the frontier molecular orbitals and Fukui function diagrams of SDZ and SDZ* calculated by quantum chemistry, four degradation paths of SDZ were speculated and confirmed the existence of the self-sensitized photodegradation process of SDZ in the system.
研究领域:
环境科学
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化学工程
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理论化学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2021
·
IF 6.158
Boqian Li,Shu Li,Ludong Yi,Haosheng Sun,Jun Qin,Jun Wang,Dawei Fang
Diazinon (DZN), a broad-spectrum and highly effective organophosphorus pesticide, is widely being used in agricultural production and household environments. However, massive DZN effluent can be generated during the DZN production process, which will cause devastating effects on the ecosystem and damage human health due to the improper dispose of pesticide effluent before discharging. In this work, hydrodynamic cavitation (HC), a new advanced oxidation technology, was used to degrade DZN in wastewater for the first time. The influences of DZN initial concentration (5.0–15 mg/L), solution pH (4.0–10), temperature (30–50 °C) and some orifice plate geometric parameters (orifice numbers and orifice half angles) on the degradation effect of DZN were investigated. It can be observed that the DZN in solution can be effectively degraded in orifice plate HC system based on three orifices with 45° convergent half angle and the degradation ratio can reach 50.52 % under the operation conditions of 150 min treatment time, 30 °C temperature and pH = 4.0 acidity. Subsequently, the studies of intensifying DZN degradation were also carried out through adding different inorganic oxidants such as potassium peroxodisulfate (K 2 S 2 O 8 ), potassium periodate (KIO 4 ) and sodium perchlorate (NaClO 4 ). The maximum DZN HC degradation extent (81.92 %) can be achieved in the presence of K 2 S 2 O 8 under the optimized conditions. The generated intermediate products in DZN HC degradation process are some low-toxic and low-active substances. And that, these intermediate products can be further mineralized to H 2 O, CO 2 and inorganic ions. On the basis of cavitational yield, the energy consumption analysis has been performed. Overall, this work demonstrates that the HC combined with oxidant K 2 S 2 O 8 may be a promising strategy for the large-scale treatment of organophosphorus pesticide wastewater.
研究领域:
环境科学
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农药化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jingxin Li,Jing Huang,Xiaomin Tang,Shixin Zhang,Hailin Yang,Xiaoxia Bai,Huaili Zheng
Organic polymer flocculants as the typical chemicals are widely applied in wastewater treatment. The efficient initiation method will increase the synthesis efficiency of organic polymer flocculants and reduce their synthesis cost. Herein, a novel synergistic initiation system of modified-titanium dioxide (modified-TiO 2 ) and potassium persulfate (K 2 S 2 O 8 ) was applied to prepare a cationic organic polymer flocculants, VLIF, under visible light. The initiation mechanisms of VLIF were investigated via molecular dynamics simulation, experiments and characterization. The results indicated that there were synergies of modified-TiO 2 and K 2 S 2 O 8 during the initiation. Modified-TiO 2 was firstly excited and generated active radicals and electron-hole pairs. Photogenerated electrons reduced K 2 S 2 O 8 . K 2 S 2 O 8 was subsequently excited and simultaneously facilitated the generation of free radicals of modified-TiO 2 . The prepared VLIF possessed the excellent physical and chemical properties. It performed well in the treatment of wastewater containing tetracycline, colloidal particles and natural organic matters. The highest removal rate of tetracycline was 76.85% achieved by VLIF. The strong interaction between VLIF and tetracycline, micelles formed by sodium dodecyl sulfate (SDS) and tetracycline, bridging and adsorption all contributed to tetracycline removal from wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Chemistry
·
2018
·
IF 1.726
Yinke Zhang,Hang Xu,Mengfan Jia,Zhuang Liu,Deqiang Qu
Response surface methodology (RSM) was selected to optimize a desulfurization process with metal based ionic liquids ([Bmim]Cl/CoCl2) and potassium monopersulfate (PMS) together to remove benzothiophene (BT) from octane (simulating oil). The four experimental conditions of PMS dosage, [Bmim]Cl/CoCl2 dosage, temperature, and reaction time were investigated. The results showed that the quadratic relationship was built up between BT removal and four experimental variables with 0.9898 fitting coefficient. The optimal conditions were 1.6 g (20 wt%) PMS solution, 3.2 g [Bmim]Cl/CoCl2, 46°C, and 23 min, which were obtained based on RSM and experimental results. Under the optimal condition, predicted sulfur removal rate and experimental sulfur removal rate were 96.7% and 95.4%, respectively. The sequence of four experimental conditions on desulfurization followed the order temperature > time > [Bmim]Cl/CoCl2 dosage > PMS solution dosage.
研究领域:
化学工程
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环境科学
✓ 已验证
DOI
高影响因子
BIOCHEMICAL ENGINEERING JOURNAL
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2024
·
IF 3.7
Jiejing Zhang,Xu Song,Yu Wu,Jing Liang,Jun Lu,Jianfeng Zhang
Acid pretreatment is considered as one of the most promising pretreatment strategies. However, the operation temperature of acid pretreatment is commonly higher, and acid pretreatment is difficult to remove lignin. Herein, a novel pretreatment strategy (dilute sulfuric acid coupling K 2 S 2 O 8 (DA-PDS) pretreatment) was proposed to remove lignin at lower temperature. The feasibility of DA-PDS pretreatment was predicted by means of density functional theory (DFT). Then, the optimal operation conditions of DA-PDS pretreatment were studied. Temperature was proved to be the most critical factor affecting the DA-PDS pretreatment. The optimal reaction conditions of DA-PDS pretreatment were 5 % DA and 6 % PDS at 80 °C for 2 h. The operation temperature was 40 °C lower than common acid pretreatment. On this condition, the cellulose content and enzymatic hydrolysis efficiency by DA-PDS pretreatment were about 59 % and 73 %, which were 11 % and 13 % higher than that of DA pretreatment, respectively. In addition, this study revealed the mechanism of DA-PDS pretreatment. DA not only accelerated radical generation rate, but also improved the contact probability between radical and lignin. Radicals generated by PDS destroyed the structure of lignin. This made DA more easily to remove hemicellulose . This work presented a novel and energy-saving strategy for lignocellulose pretreatment.
研究领域:
生物化学
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可再生资源工程
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Xia Qiu,Ling Wang,Yinggui Zhu
A novel electrochemiluminescence (ECL) system consisting of Eosin B (EB) and K 2 S 2 O 8 was studied and found to generate ECL following the oxidation or reduction of Eosin B and K 2 S 2 O 8 . The type of buffer solution, type of co-reactant, pH value, and K 2 S 2 O 8 concentration were optimized through experiments to make the reaction system reach the best value. In addition, we found that Cr 3+ has a great quenching effect on the EB reaction system. Through the comparison of ECL and CV under different conditions, DPV curve, UV spectrum and ECL spectrum experiments, we focused on the quenching mechanism of Cr 3+ on the system and made reasonable guesses. This method demonstrates the potential application value of ECL in the field of environmental monitoring and reveals the potential value of organic molecular ECL luminophores.
研究领域:
分析化学
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环境科学
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电化学
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 45
·期 2
·757-768
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IF 1.674
Li Qiang,Wang Lifang,Zhang Li,Xie Hongyong
In this study, rapid degradation of Tetrabromobisphenol A (TBBPA) is explored by using photocatalysis of homo/heterogeneous UV/TiO 2 /potassium persulfate (KPS) systems in alkaline solutions. The experimental results show increasing pH values and decreasing the initial concentration of TBBPA could increase the degradation degree, while the loading amount of TiO 2 and dosage of potassium persulfate have optimum values to increase the degradation degree. TBBPA can be almost completely degraded and 70% of TOC removal efficiency is achieved in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis, much more than the UV/KPS system and UV/TiO 2 system. Roles of radicals \(\text{SO}_{\text{4}}^{ \cdot - }\) and OH · in the photocatalysis systems are discussed based on experimental measurements. The significant TOC removal efficiency and increased bromide ion concentration yield show that there exist synergistic effects in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis, which can mineralize TBBPA into inorganic small molecules relatively thoroughly, thus much less intermediates are formed in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Yingqing Guo,Zhenyu Jin,Xiaolu Li,Feng Wang,Yuanyuan Yan,Leiyu Feng
Water pollution caused by antibiotic abuse has become an urgent environmental problem. In this study, nitrogen-doped carbon materials which were prepared with reindeer manure via a thermal annealing method (shortened as DF X , X representing the thermal temperature) were applied to the removal of tetracycline hydrochloride (TH) in wastewater. According to the results, the DF700 material had the best adsorption ability, and could catalyze the degradation of TH by potassium persulfate (PS). At the initial concentration of 35 mg/L, about 69.8% of TH could be removed within two hours after the catalytic oxidation . The material characterization showed that DF700, which was doped with 2.4% nitrogen atoms , had a large specific surface area and mesoporous structures, resulting in excellent adsorption and catalytic properties. Furthermore, the degradation reaction by PS over the nitrogen-doped carbon materials was confirmed a nonradical oxidation process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Scientific Reports
·
2024
·Vol. 14
·期 1
·1-11
·
IF 3.8
Yu Weiwei,Ai Ting,Sun Weizhe,Yang Shuo,Mao Yufeng,Tan JiangLin,Yu Feng,Yin Chen,Jiang Qin,Yu Chengye,Chen Shiling
In this study, MnFe 2 O 4 microspheres were synthesized to activate potassium persulfate complex salt (Oxone) for the degradation of 17β-estradiol (17β-E2) in aqueous solutions. The characteristic of MnFe 2 O 4 was detected by XRD, XPS and SEM-EDS. The experimental results indicated that the degradation of 17β-E2 followed pseudo-first-order kinetics. At 25 °C, 17β-E2 concentration of 0.5 mg/L, MnFe 2 O 4 dosage of 100 mg/L, Oxone dosage of 0.5 mmol/L, and initial pH value of 6.5, the decomposition efficiency of 17β-E2 reached 82.9% after 30 min of reaction. Additionally, free radical quenching experiments and electron paramagnetic resonance analysis demonstrated that SO 4 − • and •OH participated in the reaction process of the whole reaction system, with SO 4 − • being the main reactive oxygen species (ROS). The activation mechanism of the MnFe 2 O 4 /Oxone/17β-E2 system is proposed as follows: MnFe 2 O 4 initially reacts with O 2 and H 2 O in solution to generate active Fe 3+ -OH and Mn 2+ -OH species. Subsequently, Fe 3+ -OH and Mn 2+ -OH react with Oxone in a heterogeneous phase activation process, producing highly reactive free radicals. After four cycles of MnFe 2 O 4 material, the removal rate of 17β-E2 decreased by 24.1%.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yujuan Jing,Pingquan Wang,Qiangbin Yang,Qiurun Wang
Waste drilling mud (WDM) is a hazardous and refractory waste generated during the exploration of oil and gas fields. WDM has high chemical oxygen demand (COD) and high salinity, making it difficult to handle WDM. In this study, WDM was treated under subcritical conditions without and with hydrogen peroxide (H 2 O 2 ) or potassium persulfate (K 2 S 2 O 8 ). The removal efficiency of COD Cr (COD was measured by potassium dichromate method) reached 98.20% ~.99.6%. The contents of twelve heavy metals in liquid products were lower than the emission limit except for arsenic. But arsenic concentration decreased by 65.25%. Those detected heavy metals were almost completely removed into solid products. In addition, after introducing K 2 S 2 O 8 as an oxidant, the removal efficiency of total organic carbon (TOC) in the liquid increased by 58.34% and 13.43% compared with additive-free and H 2 O 2 , respectively. The removal efficiency of total nitrogen (TN) was the same as above, also increased by 70% and 59.26%, respectively. The results showed that the introduction of K 2 S 2 O 8 was more effective in treating WDM under subcritical conditions. Moreover, the introduction of K 2 S 2 O 8 can generate sulfate ions. Sulfate ions can form stable metal salts with lead and barium, which was conducive to the immobilization of heavy metals. This study provides a new way for the harmless treatment of WDM, and also further expands the application scope of subcritical oxidation .
研究领域:
环境科学
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化学工程
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DOI
高影响因子
WATER AND ENVIRONMENT JOURNAL
·
2020
·Vol. 35
·期 3
·902-912
·
IF 1.426
Haixia Wu,Jiawei Fan,Feng Liu,Lisha Shu,Baojian Yin
In order to promote the decomposition of pollutants, potassium peroxodisulphate (PDS) has been added to a gas-liquid dielectric barrier discharge (DBD) reactor with rod plate configuration for processing tetracycline (TC) wastewater. The effects of applied voltage, PDS dose, discharge gap, initial pH and TC concentration are discussed. The results show that the addition of PDS can significantly improve the removal efficiency of TC, the kinetic constant and the energy utilization of DBD. Compared with DBD treatment alone, the removal efficiency of TC (80 mg/L) can be increased by 45.5% after adding 0.6 g/L PDS. The TC removal efficiency increases with the increase of applied voltage and the decrease of TC concentration and discharge gap. The PDS dose has an optimal value. Weakly alkaline conditions are conducive to the removal of TC. Inorganic ions (Cl − and ) have a significant effect on removing TC. The overall findings suggest an effective method to remove organic pollutants in wastewater.
研究领域:
环境科学
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化学工程
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水处理技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）