PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
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IF 7.926
Haosheng Sun,Jun Qin,Ludong Yi,Yinghao Ruan,Jun Wang,Dawei Fang
Hydrodynamic cavitation (HC) is not only a promising wastewater treatment technology but also an efficient heat generation method. In this work, the HC degradation of several organic dyes was carried out and the related heat generation was studied. The effects of geometrical parameters (orifice angles (α = 0 ° and± 45 °) and orifice numbers (n = 3–9)) and experimental parameters (2.0–4.0 bar pressures, 30–60 °C temperatures and 5.0–15 mg/L concentrations) on Auramine O degradation and heat generation in orifice plate HC system are investigated. TOC analysis is performed to determine the mineralization degree of Auramine O solution. The generated intermediates are detected by LC-MS. In addition, the produced free radicals in HC process are identified by adding some trapping agents. The results showed that the HC technology has high mineralization and strong heat generation abilities in degradation processes of organic pollutants . For 6-orifice plate, 4.0 bar pressure, 5.0 L solution volume and 10 mg/L concentration, 81.39% degradation ratio of AO was achieved at 90 min cycle moment. And that, 1082.52 kJ heat energy with 40.09% thermal efficiency was obtained during 30 min cycle time. Perhaps, this work may provide a new strategy for simultaneous large-scale organic wastewater treatment and effective heat production recycle.
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
JOURNAL OF MOLECULAR STRUCTURE
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2023
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IF 3.8
Jincheng Mao,Chao Li,Haichao Jiang,Heng Zhang,Xiaojiang Yang,Chong Lin,Yang Zhang,Dingli Wang,Yanwen Zhang,Yanli Song
Amphoteric polymerhave attracted immense research interest in hydraulic fracturing.However, current fracturing fluids prepared using conventional suspensions have poor stability and cannot be adapted to field applications in highly mineralized oilfield blocks, and they cannot reuse highly mineralized oilfield wastewater. To solve the above problems, a new concentrated suspension was prepared as a fracturing fluid thickener. The crystal layer spacing of SMB-2 exhibited an improved value of d = 13.564 nm. Experimental findings indicate that SRS-2 exhibited rapid thickening in saline water within a 5-minute timeframe. The viscosity of SRS-2 in high-salinity solutions demonstrated an impressive viscosity retention rate of 96.8 %, highlighting its excellent salt resistance properties. The zeta potential was measured at -62.13 mV. Notably, there was no significant settlement observed even after 30 days, with a settling velocity of 9.2592 × 10 −3 mm/s, underscoring its superior stability performance. Therefore, this new suspension thickener has good potential for applications as an alternative material in multiple fields, such as oil extraction and sewage treatment.
研究领域:
材料科学
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石油工程
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环境科学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
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IF 4.2
Qianqian Nie,Linfeng Liu,Jiayou Liu,Mingwei Shen,Xiaoxiang Huang,Zhongchao Tan,Hesheng Yu
Bi2Fe4O9/ZnIn2S4 (BFO/ZIS) composites are synthesized by using a facile impregnation method and tested for the photocatalytic degradation of xanthate for the first time. The effects of multiple parameters, including catalyst dosage and the pH value of solution, on xanthate photodegradation are investigated systematically. Furthermore, the photocatalytic mechanisms of BFO/ZIS are proposed based on various characterizations and density functional theory calculations. Results show that the degradation efficiency of 30BFO/ZIS is 98.25% during 90 min of visible light irradiation, which is 2.63 and 2.89 times higher than that of pure ZIS and BFO, respectively. This is mainly because the type II heterojunction formed between BFO and ZIS improves the separation of photogenerated carriers. Furthermore, the xanthate photodegradation efficiency of 30BFO/ZIS decreases slightly from 98.25 to 92.86% after four cycles, indicating its excellent durability and stability. Finally, the chemical oxygen demand (COD) removal efficiency of 30BFO/ZIS is up to 81.06%, exhibiting a high degree of mineralization.
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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催化
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DOI
高影响因子
ChemistrySelect
·
2025
·Vol. 10
·期 27
·e04958
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IF 2
Chen Minggui,Yan Liang
Graphical Nano-SiO₂ (0.02 wt%) extends gel stability to 95 days at 130 °C in seawater (versus 70 days control). SEM-confirmed H-bonding between Nano-SiO₂ silanols and AMPS groups reinforces network. Gelation activation energy (88.2 kJ/mol) derived via Arrhenius model. Nano-SiO₂-toughened polymer gels achieves 34.7 MPa/m breakthrough pressure (10 × base gel) in 1.4 Darcy cores. This study solves water shutoff gel syneresis/ degradation in high-salinity seawater (Ca 2 ⁺+Mg 2 ⁺ >1;500 mg/L) for South China Sea reservoirs. Reservoirs in the western South China Sea have entered a high-water-cut stage, exhibiting significant heterogeneity exacerbated by prolonged water flooding, necessitating urgent profile control measures to enhance oil recovery. Conventional polyacrylamide organic gels fail under the prevailing high-temperature (130 °C) and high-salinity conditions, characterized by divalent cation (Ca 2 ⁺ and Mg 2 ⁺) concentrations of 5650 mg/L. This study developed a robust gel profile control system specifically engineered for such challenging environments. Key parameters including polymer and crosslinker concentrations, gel pH, and temperature were systematically optimized to ensure stability under high temperature and salinity. The optimized formulation demonstrates exceptional stability in seawater at 130 °C, with a gelation activation energy of 88.2 kJ/mol. Incorporating nanosilica significantly enhanced the gel's thermal stability, salinity tolerance, and shear resistance. Scanning electron microscopy (SEM) revealed a strengthened network microstructure. The system exhibits favorable injectivity in 1.4 Darcy permeability cores. Nanosilica reinforcement dramatically increased the gel's breakthrough pressure gradient from 3.45 MPa/m to 34.7 MPa/m. Crucially, the addition of 0.02% nanosilica extended the polyacrylamide gel's functional stability from 70 days to 95 days. This nanosilica-reinforced system offers superior long-term stability and plugging performance, presenting a viable profile control and water-shutoff technology for offshore high-temperature, high-salinity seawater reservoirs.
研究领域:
石油工程
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材料科学
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化学工程
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地质学
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纳米技术
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产品关联
DOI
高影响因子
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