International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 8
·1439
·
IF 2.468
Yue Teng,Ke Yao,Wenbin Song,Yongjun Sun,Haoliang Liu,Zhiying Liu,Yanhua Xu
Cu-Mn-Ce@γ-Al2O3was prepared by incipient wetness impregnation and used to catalyze ozonation in a coal chemical wastewater-biotreated effluent. The preparation factors that considerably affected the catalytic performance of Cu-Mn-Ce@γ-Al2O3, specifically metal oxide loading percentage, calcination temperature, and calcination time, were examined. The catalyst was characterized by scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, and Brunauer-Emmett-Teller analysis. The optimal catalytic ozonation operating parameters, such as ozone dosage, catalyst dosage, pH, and reaction time, were also investigated. Results showed that an optimized catalyst consisted of 17.0% CuO, 3.0% MnO2, and 2.0% CeO2(wt.%). The optimal calcination temperature and calcination time were 600 °C and 5 h. The optimal catalytic ozonation operating parameters, including ozone dosage, catalyst dosage, pH, and reaction time, were 7, 80.0 mg/L, 20.0 mg/L, 7 and 50 min, respectively. The COD removal of biotreated effluent increased to 61% under these optimal operating conditions. Meanwhile, ozonation alone resulted in only 20% removal. This work proposes the use of easily available Cu-Mn-Ce@γ-Al2O3catalyst and might drive the advancement of catalytic ozonation for chemical wastewater purification.Keywords:catalyst;catalytic ozonation;coal chemical wastewater;advanced treatment
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Bo Lv,Wen Fan,Feishuo Jiao,Yutong Jiao,Baolin Xing
Gasification slag landfill has caused serious environmental pollution in coal chemical sector. Therefore, the utilization of coal gasification slag as a precursor for adsorbent production represents a significant avenue for the sustainable management of this industrial by-product. However, there are few researches on the systematic alkali modification of gasification slag. In this study, an optimized alkali modification process employing a 3 mol/L NaOH solution, a liquid-to-solid ratio of 10:1, conducted at 100 °C for a duration of 10 h, resulted in the production of a high-performance adsorbent, i.e., alkali modified coal gasification slag (CGS-OH). Besides, The formation of an axial crystal structure zeolite crystal on the adsorbent surface. Under optimal adsorption conditions with a pH of 6, an adsorbent dosage of 3 g/L, and a temperature of 25 °C, CGS-OH exhibits the optimal adsorption performance for removal of Pb 2 + , characterized by a high removal rate of 95.77 % and substantial equilibrium adsorption capacity of 47.5 mg/g. Herein, the adsorption kinetics of the above process are well described by the pseudo-second-order kinetic model ( R 2 = 0.9981), indicating that the adsorption process is predominantly governed by a chemical adsorption mechanism, primarily involving electrostatic attraction and ion exchange at the adsorbent's surface. This research underscores the potential of CGS-OH as a cost-effective and high-performance adsorbent for Pb 2+ removal, offering significant implications for industrial wastewater treatment and environmental remediation strategies. It also provides a feasible path for the high-value utilization of industrial by-products in coal chemical sector.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2021
·
IF 4.311
Yong Suo,Yongsheng Ren
The influence of representative typical pollutants in the zero-discharge process of coal chemical high-salty wastewater on the fouling behavior of nanofiltration membranes was studied. In this study, a commercially available NF90 nanofiltration membrane was selected, with three inorganic salts, cyclohexanol (C 6 H 12 O) and APAM as the main target foulants. Various membrane samples were characterized by Contact angle, AFM and SEM-EDS, and the membrane fouling behavior was quantitatively evaluated by analyzing the influence of the interaction between different components in the feed solution on the membrane flux and interface thermodynamics. The results show that the deposition of fouling is closely related to the interface free energy (ΔG). The AB interfacial energy significantly affects membrane fouling. Membrane fouling is mainly dominated by residual APAM, followed by inorganic salts and cyclohexanol. The interaction between organic and inorganic fouling is the core factor that exacerbates membrane fouling. The interaction between APAM and inorganic salt ions mainly accelerates membrane fouling through charge shielding and complexation. Cyclohexanol accelerates membrane fouling mainly by reducing the solubility of inorganic salts and absorbing on the surface of the fouling layer. The competition and synergy between hydrophilic APAM and hydrophobic cyclohexanol are also the factors that aggravate membrane fouling.
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
Case Studies in Thermal Engineering
·
2025
·
IF 6.4
Junjie Wu,Junsheng Hou,Li Ma,Lei Huang,Zihan Ding,Hao Zhang,Baiqi Tian,Wenjing Zhou,Zhenzhen Chen,Nanjing Hao
With the development of the coal chemical industry, the production of coal gasification slag (CGS) is increasing, and the utilization is becoming challenging. Products of CGS utilization mainly include activated carbon, zeolites, silicon-carbon composites. However, the consumption of these products above is limited, which is insufficient to utilize the output thoroughly. As a result, it is urgent to expand the application area for large-scale and high-value utilization of CGS. CGS is rich in elements including aluminum and calcium, presenting a promising material for synthesizing nanofluids, which is promising for the thermal management of microelectronic devices. This study synthesizes hydrocalumite nanofluids from CGS and applies the nanofluids for flow boiling heat transfer experiment. Nanofluids with an average particle size of 50 nm are synthesized and applied to flow boiling heat transfer experiments. The critical heat flux (CHF) and the heat transfer coefficient (HTC) are improved by a maximum of 43 % and 52 %. Moreover, the fundamental principle of enhancement is discussed. Improved wettability, delayed bubble coalescence, additional nucleation sites are attributed to the improvement. This study not only presents a novel method for high-value utilization of CGS but also introduces a potential approach for thermal management enhancement of microelectronic devices.
研究领域:
材料科学
·
能源工程
·
电子器件热管理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ningning Zhang,Mengyan Cheng,Rui Han,Zhen Li,Anning Zhou,Hong Wang
Coal gasification fine slag (CGFS) is a large solid waste in the field of coal chemical industry, and the separation of its carbon and ash is a prerequisite for the large-scale utilization of CGFS. At present, the flotation separation process of CGFS faces the prominent bottleneck of high consumption of traditional non-polar hydrocarbon oil collectors and poor flotation effect. To address this challenge, three fatty acids, oleic acid (OA), n-decanoic acid (DA), and naphthenic acid (NA), were used in this study to compound with the nonpolar hydrocarbon oil dodecane, respectively, as novel collectors for CGFS flotation. The effect and action mechanism of the composite collectors on CGFS flotation were investigated through flotation experiments as well as surface/interfacial tension, laser particle size, heat of wetting, FTIR, XPS, and induction time tests. The results show that the composite collectors can enhance the flotation effect of CGFS while reducing the chemical consumption. The addition of polar fatty acids can effectively reduce the interfacial tension of the collector-water system and thus increase the dispersion of the collector in water. Meanwhile, the addition of fatty acids makes the composite collector contain both polar and nonpolar groups. The polar groups form hydrogen bonds with the oxygen-containing groups on the residual carbon surface to mask the hydrophilic region, and the nonpolar groups are exposed to the slurry to enhance the hydrophobicity of the residual carbon surface, which makes the residual carbon adhere to the air bubbles more easily and thus facilitates its flotation recovery from CGFS. This study has important theoretical guidance for the efficient separation and resource recovery of CGFS.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Zhiyuan Feng,Qingling Tian,Qianqian Yang,Yanbo Zhou,Hongying Zhao,Guohua Zhao
The fine-tuning of generating hydroxyl radical ( OH) and singlet oxygen ( 1 O 2 ) was firstly proposed via the selectively photoelectrochemical (PE) reduction of oxygen with Cu-coordinated carbon-nitride-electrode (CuCN). Complete removal efficiency and trace Cu leaching (<0.01 ppm) were achieved during treatment of dimethyl phthalate and atrazine, which were mainly oxidized by OH and 1 O 2 , respectively. Besides, no toxic intermediates was detected in the whole degradation process. The overall oxygen reduction pathway in PE system was demonstrated by electron paramagnetic resonance measurements and quenching tests. The valence band position of CuCN was designed to be more negative (−1.5 V SHE ) for favoring the photocatalytic oxygen reduction. Specifically, Cu-N 2 -C as active sites optimized the Gibbs free energy of intermediate *OOH (ΔG *OOH = 3.99 eV) to improve the reactivity of two-electron oxygen reduction. The CuCN/photoelectrochemical system is applied for treatment of coal water slurry gasification (CWS) wastewater with high concentration of salt. The TOC of CWS was successfully decreased from 127 to 1.9 mg·L −1 in 3 h with a low specific energy consumption of 0.024−0.05 kW·h·g −1 ·TOC −1 . The treated CWS wastewater can be used for recovery and utilization of salt as chemical raw materials. This work highlights the important role of synergistic photo-electro-catalytic effect in regulating the generation of active oxygen species via oxygen reduction pathway, which can be a promising way especially for salinity coal wastewater remediation.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Lijie Zhong,Xuan Jiang,Runqiu Zhang,Jiahui Shao,Lina Chi,Yalin Wang,Jinping Jia,Diwen Ying
Mixed salt from the concentrated brine that contains NaCl and Na 2 SO 4 has been classified as hazardous waste since 2016 in China. This fact created an urgent and tremendous demand to treat these brine promptly. In this paper, we reported a method of using selectrodialysis with the bipolar membrane (BMSED) to reutilize the concentrated brine to produce high-purity HCl, NaOH, and Na 2 SO 4 , which fulfilled the demand above. The selective PPy(Cl) composite membrane, which was able to separate NaCl and Na 2 SO 4 in the concentrated brine, was prepared. The 3.5 μm PPy(Cl) film significantly enhanced the selectivity of the anion exchange membrane (AEM) to chloride ions while sulfate ions were blocked. The BMSED stack with our multilayer PPy(Cl) composite AEM produced 1.23 mol/L HCl with a purity higher than 98.2%. More importantly, the prepared PPy(Cl) composite AEM was not only suitable for brine with a high Cl − /SO 4 2− of 19:1, which was the typical ratio in concentrated brine from the coal chemical industry, but also able to treat the brine with a Cl − /SO 4 2− as low as 1:1, showing superior capability. The effluent of the BMSED we developed, which contained 0.02 mol/L Na 2 SO 4 with the Cl − /SO 4 2− equaling to 1:1, could be further concentrated by reverse osmosis for sea water (RO-SW) and freeze crystallization to obtain Na 2 SO 4 with a high purity accordingly. This reutilization route of concentrated brine was very green because it not only produced no hazardous waste, but also recycled valuable products. Therefore, it was believed a promising application in the coal chemical industry.
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
RADIATION PHYSICS AND CHEMISTRY
·
2024
·
IF 2.8
Zhen Li,Jiaxin Liu,Wenbao Jia,Chao Zhou,Lingxi Li,Daqian Hei,Qing Shan,Xiaojun Zhang,Yongsheng Ling
Wastewater from the coal chemical industry contains large amounts of refractory organic compounds that pose a serious threat to the environment. This paper proposes a pre-treatment method based on gamma irradiation to improve the biodegradation characteristics of coal chemical industry wastewater. Samples containing phenol, hydroquinone, p-cresol, and quinoline were irradiated using 60 Co gamma source at an absorbed dose of 20 kGy. The results showed that the chemical oxygen demand slightly decreased with increasing absorbed dose, whereas the BOD 5 /COD ratio increased from 0.044 to 0.310, indicating a significant enhancement in biodegradability induced by gamma irradiation. Anaerobic digestion tests showed that the cumulative gas production for wastewater samples with initial concentrations of 40, 60, and 80 mg/L increased by 161.78%, 64.07%, and 35.51%, respectively, at 20 kGy, compared to that for the unirradiated samples. The ultraviolet spectrum analysis and infrared spectrum analysis results showed that the concentrations of aldehyde and ketone small molecule organics increased, and there were more biodegradable organic substances in the wastewater samples after irradiation. Microbial colony analysis revealed beneficial changes in the methanogenic archaea during the Anaerobic digestion (AD) process and increased the stability of the anaerobic fermentation system.
研究领域:
环境科学
·
微生物学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lu Yang,Yongjun Liu,Aining Zhang,Zhe Liu,Zhuangzhuang Yang,Chunxiao Wei,Zhihua Li
This study aimed to investigate the effectiveness of a biochemical treatment system for coal chemical wastewater (CCW) in degrading aromatic compounds. The study examined the degradation sequence of different compounds, including benzene series (BTEX), phenols, polycyclic aromatic hydrocarbons (PAHs), and nitrogen heterocyclic compounds (NHCs), in the system. The study also analyzed the metabolic characteristics of accumulated aromatic organic compounds in the cells of microorganisms. The results showed that the aromatic compounds were first adsorbed from water by extracellular polymers (EPS) before entering the cells. The removal rates of COD and TOC in CCW reached 95% after system operation for 8 h. BTEX and NHCs were completely degraded outside the cells within 2 h, whereas PAHs and some phenols accumulated inside the cells. The metabolic characteristics of the accumulated compounds were analyzed and found to be gradually degraded through the action of catechol dioxygenase. The study findings not only demonstrate the potential for achieving efficient biodegradation of aromatic compounds in CCW but also provide the essential theoretical underpinning for the regulation and environmentally benign treatment of such wastewater within a biochemical treatment system.
研究领域:
环境生物学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhe Liu,Qi Liu,Xuhua Zhang,BingRui Shi,Dandan Qin,Jiaxuan Wang,Aining Zhang,Yongjun Liu
In this study, the sewage sludge was converted into sludge biochar (SBC) and doped with Cu-Ni bimetal to synthesize a novel composite catalyst (Cu-Ni@SBC) for the activation of H 2 O 2 for phenol degradation. Characterization results showed that the Cu-Ni bimetal was successfully doped into the SBC and led to the formation of a porous structure with abundant cavities, resulting in a larger specific surface area and higher adsorbed oxygen content. Mechanism analysis revealed a valence state conversion cycle between Cu 0 -Cu(II), Ni(III)-Ni(II) and Cu-Ni which made Cu-Ni@SBC have higher electron transfer performance. Response surface methodology was applied to determine the optimal preparation and reaction conditions, under which the Fenton-like system composed of Cu-Ni@SBC and H 2 O 2 removed 100 % of phenol and mineralized 69.1 % of TOC from simulated wastewater. In addition, the experimental results showed that the Cu-Ni@SBC material had a relatively wide pH adaptation range (4–8), and the removal efficiency of phenol could reach 76.4 % after 5 cycles of experiments, and the catalytic inhibition rates of the two common coexisting anions, HCO 3 – and Cl - , were 17.1 % and 0 %, respectively. The results of practical application revealed that the phenol removal efficiency reached 90.44 % and the pollutant mineralization rate could reach 58.5 % within 90 min, which proved that the catalyst was suitable for the advanced degradation of organic matter in coal chemical wastewater. Therefore, Cu-Ni@SBC can be considered as a promising Fenton-like catalyst, and the process method is also of some guiding significance for the treatment of coal chemical wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Pengfei Li,Yongjun Liu,Zhuangzhuang Yang,Lu Yang,Pan Liu,Zhe Liu,Xiaowei Li
The complete harmless treatment of aromatic organic compounds in coal chemical wastewater (CCW) has always been a big challenge in water process engineering. This study addresses the issue by designing and preparing a kind of Ce and Al bimetallic catalyst with high oxygen vacancies (OVs) based on SiC carrier. The results showed that CeO 2 and Al 2 O 3 were uniformly dispersed on SiC, and the composite material exhibited an ordered cubic structure. The degradation efficiency and enhancement mechanism of the catalyst with ozone oxidation were investigated. When applied to actual CCW with a chemical oxygen demand (COD) concentration exceeding 600 mg/L, the synergy between O 3 and CeO 2 /Al 2 O 3 -SiC increased the degradation efficiency of phenols from 50 % to 99 % and COD from 42 % to 78 % compared to using O 3 alone. CeO 2 /Al 2 O 3 -SiC had a high concentration of oxygen vacancies (OVs = 48.57 %). Further research indicated that oxygen vacancies (OVs) were the main active sites for ozone adsorption and reactive oxygen species (ROSs) generation. Electron paramagnetic resonance (EPR) and quenching experiments also confirmed that O 3 , •O 2 −1 , 1 O 2 were the main active oxidation factors, rather than •OH. Additionally, even after granulating the catalyst, it still achieved 99 % degradation of phenols. Therefore, this study provides theoretical support for the complete harmless treatment of CCW and has broad prospects for industrial application.
研究领域:
环境工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Bingxiao Feng,Lining Hao,Chaoting Deng,Jiaqiang Wang,Hongbing Song,Meng Xiao,Tingting Huang,Quanhong Zhu,Hengjun Gai
Catalytic wet air oxidation (CWAO) can degrade some refractory pollutants at a low cost to improve the biodegradability of wastewater. However, in the presence of high temperature and high pressure and strong oxidizing free radicals, the stability of catalysts is often insufficient, which has become a bottleneck in the application of CWAO. In this paper, a copper-based catalyst with excellent hydrothermal stability was designed and prepared. TiO 2 with excellent stability was used as the carrier to ensure the long-term anchoring of copper and reduce the leaching of the catalyst. The one pot sol–gel method was used to ensure the super dispersion and uniform distribution of copper nanoparticles on the carrier, so as to ensure that more active centers could be retained in a longer period. Experiments show that the catalyst prepared by this method has good stability and catalytic activity, and the catalytic effect is not significantly reduced after 10 cycles of use. The oxidation degradation experiment of m -cresol with the strongest biological toxicity and the most difficult to degrade in coal chemical wastewater was carried out with this catalyst. The results showed that under the conditions of 140 °C, 2 MPa and 2 h, m -cresol with a concentration of up to 1000 mg·L −1 could be completely degraded, and the COD removal rate could reach 79.15%. The biological toxicity of wastewater was significantly reduced. The development of the catalyst system has greatly improved the feasibility of CWAO in the treatment of refractory wastewater such as coal chemical wastewater.
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
危险品化学品经营许可证（带存储）