SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Zhiyuan Zhang,Guixia Fan,Guoli Zhou,Daoguang Teng,Hongyan Nan,Peng Li,Yijun Cao,Jiongtian Liu
Germanium, a critical metal, is predominantly located in lignite and lead–zinc ore. The germanium was commonly extracted from the fly ash of germanium-rich lignite (GRL), however, facing the challenges of specific combustion conditions, low lignite’s thermal efficiency and value, high CO 2 emissions, and waste acid treatment. Therefore, in this work, a novel method for directly leaching germanium from the GRL was proposed, facilitating low-carbon extraction under mild conditions, and reducing lignite loss during leaching process. Results showed that leaching germanium from the GRL using thionyl chloride achieved the goals of “kill two birds with one stone”, i.e. , leaching efficiency of germanium above 95 wt % and recovery yield of lignite over 95 wt %. Specifically, the theoretical leaching efficiency of germanium reached 99.60 wt % while the recovery yield of lignite reached 86.35 wt %, at the temperature of 20 °C, liquid–solid ratio of 4 mL/g, and leaching time of 6 h. Most of the leached germanium was remained in the aqueous phase after the leaching solution was quenched, facilitating the subsequent separation of germanium. In this study, efficient extraction of germanium from the GRL was achieved with a high recovery yield of lignite, preserving the matrix structure and main composition of lignite. Therefore, this method provides a feasible way for efficient extraction of germanium from lignite with low-carbon emission under mild condition.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yang Wang,Guorong Yi,Wanqiang Zhang,Jiawei Hou,Kuok Ho Daniel Tang,Bowen Wang,Hua Li,Quan Wang,Hamada Abdelrahman,Tao Zhang,Sabry M. Shaheen,Ronghua Li
In this study, the effects and mechanisms of water-soluble ferrous salts (WSFS) on the humification and carbon conversion during the co-composting of hoggery slurry (HG) and wheat husks (WH) were investigated. A composting mixture of HG and WH was treated with FeCl 2 addition (T1) and FeSO 4 addition (T2), and compared with an untreated control (CK), as a function of time (28 days). The duration of the high-temperature phase (>50 °C) for CK, T1, and T2 are 17, 15, and 15 days, respectively. Compared to the CK, T1 and T2 treatments reduced CO 2 emissions by 11.4 % and 32.0 %, respectively. The calculated total global warming potential values were 293.67 (CK), 267.69 (T1) and 207.10 (T2) g CO 2 eq kg −1 . The humus concentrations increased in all treatments: CK by 28.10 %, T1 by 53.41 % and T2 by 49.73 % in composting. WSFS addition enhanced biotic humification by elevated the abundance and distribution of Bacillus , which promotes cellulose and hemicellulose decomposition, and Tepidimicrobium , which accelerates the production of humus, through use of sugars and proteins. Besides, WSFS addition decreased the levels of pathogenic bacteria in the final compost product. Notably, WSFS addition also benefited the abiotic humification by production of •OH during oxidation of Fe(II) in composting. This study enhances the understanding of the biotic and abiotic functions of FeSO 4 and FeCl 2 in promoting humification and reducing carbon emissions during composting. The detailed role of hydroxyl radical in composting and the effectiveness of WSFS-addition in composting nitrogen transformation are still need to be addressed in future.
研究领域:
环境科学
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微生物学
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2024
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IF 9.7
Zhanshi Ni,Haobo Bi,Hao Shi,Xiang Liu,Junjian Tian,Yurou Yao,Liqun He,Kesheng Meng,Qizhao Lin
The escalating total amount of industrial solid waste is increasingly taxing the ecological environment. Co-combustion technology is seen as a potential solution to this problem. This study investigated the interaction mechanism and carbon dioxide emissions during the co-combustion process of coal slime and biomass (lignin) using a programmed heating method. The experimental results reveal that the two sub-reaction models effectively depict the combustion process of coal slime. In the co-combustion process, the comprehensive combustion and ignition performance of the mixed fuels surpasses that of coal slime, but the stability of the combustion flame is reduced. The combustion performance of the mixed fuel is primarily influenced by two common factors. The interaction between lignin and coal slime significantly changes with the variation of mixing ratio and heating rate . The main product in the combustion process of mixed fuels is carbon dioxide. Due to the competition for oxygen among volatile matter, the emission of carbon dioxide is lower than the theoretical value. When the mass percentage of lignin is 70 %, the impact on carbon dioxide is most pronounced. The experimental results of this study provide a foundation for understanding the interaction mechanism of coal slime and biomass co-combustion. The research findings also provide theoretical guidance for the safe operation of coal slime and biomass co-combustion equipment.
研究领域:
能源与环境科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
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IF 8.4
Lan Zhang,Junyu Liu,Keli Zhang,Xiang Dong,Yan Zhao,Qihong Cen
Solid waste derived ceramsites are a typical representative of the “treat waste by waste” concept, however, they have not been given enough attention due to high energy consumption, large carbon emissions and low efficiency. In this work, a hypoxic roasting method was used to prepare industrial solid derived ceramsite for the removal of heavy metal Cd(II) from aqueous solution. Compared with conventional ceramsite (CC), the novel hypoxic ceramsite (HC) exhibited higher specific surface area, more hydroxyl and aromatic functional groups, and more developed pore structure. It could effectively adsorb Cd(II) from aqueous solution in a wide pH range of 2–8, and the adsorption rate was 3 times that of CC. The maximum adsorption capacities of Cd(II) by CC and HC were 22.9 and 32.2 mg/g at 25 °C respectively. The adsorption mechanisms included electrostatic interaction, hydrogen bond reaction and complexation reaction. After five regeneration cycles, the removal efficiency of HC maintained 86.9 %. Furthermore, about 60 % of carbon was retained in HC, largely reducing carbon emissions. These findings reveal the energy conversation and environmental friendliness of this ceramsite, which strongly supports the development and popularization of hypoxic preparation methods for ceramsites.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Chi Haoyuan,Liang Zhanpeng,Kuang Siyu,Jin Yaxin,Li Minglu,Yan Tianxiang,Lin Jianlong,Wang Shuangyin,Zhang Sheng,Ma Xinbin
Ethylene glycol, a widely used chemical, has a large global capacity exceeding 40 million tons per year. Nevertheless, its production is heavily reliant on fossil fuels, resulting in substantial CO 2 emissions. Herein, we report an approach for electrochemically producing ethylene glycol from biomass glycerol. This process involves glycerol electrooxidation to glycolaldehyde at anode, which is subsequently electro-reduced to ethylene glycol at cathode. While the anode reaction has been reported, the cathode reaction remains a challenge. An electrodeposited electrode with metallic Cu catalyst enables us to achieve glycolaldehyde-to-ethylene glycol conversion with an exceptional faradaic efficiency of about 80%. Experimental and theoretical studies reveal that metallic Cu catalyst facilitates the C=O activation, promoting glycolaldehyde hydrogenation into ethylene glycol. We further assemble a zero-gap electrolyzer and demonstrate ethylene glycol electrosynthesis from glycerol to give a decent production rate of 1.32 mmol cm –2 h –1 under a 3.48 V cell voltage. The carbon intensity assessment based on a valid assumption reveals that our strategy may reduce CO 2 emissions by over 80 million tons annually compared to conventional fossil fuel routes.
研究领域:
化学工程
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环境科学
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能源研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Xiong Ke,Tuo Wei,Gengrui Wei,Acong Chen,Xiaoqian Cheng,Zemin Li,Zhi Qin,Zijun Pang,Jiamin Pan,Yao Chen,Cong Wei,Xianghong Guan,Xuguang He,Guanglei Qiu,Haizhen Wu,Chaohai Wei
The wastewater from coke making is characterized by high toxicity, high concentration of pollutants and complex composition. Therefore, it is difficult to treat using conventional methods such as advanced oxidation and ion exchange processes. In this study, a zero-discharge integrated process (ZDIP) composed of pre-physicochemical – oxic – hydrolytic & denitrification – oxic – post-physicochemical (A/O/H/O/A) biological, pre-processing, membrane and end-processing units was created to treat coking wastewater. The results showed that most of the chemical oxygen demand, sulfide, cyanide and NH 4 + -N in the coking wastewater were removed in A/O/H/O/A biochemical unit. Hardness, F − and turbidity were further eliminated in the pre-processing unit, while more than 98 % of the effluent was reused in the membrane unit. Finally, zero discharge treatment of residual liquid and sludge was realized in the end-processing unit. The operating cost was about 2.49 USD/m 3 and the carbon emissions 9.17 kg CO 2 -eq/m 3 of influent for the entire ZDIP. Theoretically, the ZDIP based on hierarchical cycle drive, which is applicable to handling complex wastewaters, cutting carbon emissions and recycling water, can be taken as an effective wastewater treatment process in the next decade.
研究领域:
环境工程
·
废水处理
✓ 已验证
DOI
高影响因子
CANADIAN METALLURGICAL QUARTERLY
·
2024
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IF 1.3
Xiaohua Peng,Xin Jin,Yong Zhen,Bo Yang,Chang Wei,Xingbin Li,Zhigan Deng,Minting Li
This study introduces a novel synergistic leaching process for ferronickel powder and high nickel matte, enabling the atmospheric leaching and the hematite precipitation process to mitigate carbon emissions associated with the treatment of Ni laterite. The results indicated that following seven cycles of synergistic leaching, the Ni2+ concentration in the solution exceeded 80 g/L, compared with the 15 cycles required for non-synergistic leaching. Optimal leaching conditions included a temperature range of 80°C−95°C, a stirring speed of 300 rpm, an initial H2SO4 concentration of 100 g/L, and a reaction time of 8 h, maintaining a final pH of 3.5−4.5, and an excess of ferronickel powder. Leaching successfully extracted Ni and Fe from ferronickel powder, with Cu2+ in the solution being reduced and enriched in the leaching residue. For the hematite precipitation process, optimal conditions involved a temperature of 200°C, a stirring speed of 500 rpm, a reaction time of 3 h, and an addition of 20 g/L of high Ni matte. The Fe removal efficiency exceeded 86%, resulting in hematite products that contained 61.15% Fe, 0.60% Ni and 1.48% S. These products can be commercially utilised, either sold to cement plants or utilized as raw materials for ironmaking.
研究领域:
冶金工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Buildings
·
2024
·Vol. 14
·期 12
·3835
·
IF 3.1
Yang Zheng,Zhi-Yuan Zhang,Yisong Liu,Xiaozhu Zhang,Shaoguo Kang,Leyang Lv,Junbo Zhou
The utilization of silicomanganese slag (SiMnS) as a precursor for alkali-activated materials (AAMs) is considered as an efficient approach for sustainable and eco-friendly large-scale resource utilization. However, sodium silicate solutions account for more than 50% of the production costs and carbon emissions of AAMs. In this study, AAM activators were prepared by silica-containing waste (acid leaching residue of boron mud, BM-AR) and NaOH as raw materials, and were successfully substituted for commercial sodium silicate-NaOH activators. Results indicated that the NaOH dosage had a great effect on the concentration and modulus of the activator. With the appropriate dosage of NaOH (NaOH: BM-AR = 0.4–0.7), suitable moduli of AAM activators can be produced at a wide range of solid/liquid ratios (L/S = 3–4.5) under mild conditions (80–100 °C). The compressive strength of the SiMnS AAM specimens prepared by this activator can reach 68.58 MPa, and its hydration products were mainly hydrated calcium silicate and amorphous silica–alumina gel, indicating the successful preparation of AAM. Calculation showed that the carbon emission of the AAMs prepared in this study was 12.4% and 37.6% of that of OPC and commercial water glass/NaOH-activated AAMs, and the cost was only 67.14% and 60.78% of them. The process achieves the use of waste materials to replace commercial activators, and is expected to be extended to a variety of AAMs raw materials and silica-containing waste. This makes it a highly promising alternative method for the production of AAMs, particularly the ‘just add water’ AAMs.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Yong Zhang,Hongzheng Zhu,Jinbo Zhu,Fanfei Min,Jun Chen,Qinghui Shi
Understanding the effect of inorganic cations on the adsorption of kerosene droplet at graphite surface is a prerequisite to predict the graphite flotation. Using a high-speed motion acquisition system, the contact angle, kerosene droplet size and three phase contact line (TPC line) were explored. The equivalent diameter of the kerosene droplet increased until 10 -2 mol/L and then decreased slightly with increasing the concentration of NaCl and MgCl 2 . On contrary, the equivalent diameter showed an opposite trend in the presence of AlCl 3 . The final TPC line followed the order: AlCl 3 < MgCl 2 < NaCl at an ion concentration 10 -2 mol/L. Through the simulation of radial distribution function (RDF) via the Material studio software, the oxygen atom was more easily attracted than the hydrogen atom by Na + , resulting in the smallest kerosene droplet-graphite block contact angle in the presence of NaCl. Furthermore, NaCl and MgCl 2 presented an opposite trend to AlCl 3 in the solution/kerosene interfacial tension. Our results matched the cation hydration at different pH. The subsequently conducted graphite flotation showed that the recovery of clean graphite was enhanced by 5.11% (NaCl) and 3.31% (MgCl 2 ) at 10 -2 mol/L, respectively, while gradually decreased by the addition of AlCl 3 . Moreover, the discussion on increasing the graphite recovery by 1% showed that 1.9 mmol/L Na + was equivalent to 3.0 mmol/L Mg 2+ , 18.3 J energy input, 7 mg/L 2-octyl alcohol and 0.9 mg/L diesel, respectively. It indicated that the addition of NaCl and MgCl 2 is of great significance for reducing carbon emission and cleaning flotation process. Our results can provide a valuable insight into the development of technology for surfactant adsorption and mineral flotation, especially for reducing carbon emission.
研究领域:
矿物加工工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Yong Liu,Lungang Chen,Yubao Chen,Xinghua Zhang,Jianguo Liu,Qiying Liu,Yuping Li,Chenguang Wang,Qi Zhang,Longlong Ma
Aviation fuel is high energy density and is usually produced from refinery in petroleum industry. Production of renewable aviation fuel from biomass eases pressure of carbon emission regulation. The operational processes in this study include steam stripping, hydrolysis of residues, condensation reaction unit, autoclave hydrogenation, fixed-bed hydrodeoxygenation, and oil-upgrading unit. The biomass-derived aviation fuel has a low oxygen content of 0.4 %, while its high heat value is 45.5 MJ/kg. The aviation fuel ranges from C8 ∼ C15, and rich in isoparaffins (50.4 %) while the n -paraffins have a selectivity of 12.2 % and other components are cycloparaffins (19.0 %), aromatic hydrocarbons (11.3 %), and alkenes (5.6 %). The mass yield for aviation fuel from corn stover reaches 10.6 %. This pilot study achieved production of aviation fuel from raw biomass corn stover.
研究领域:
能源生物学
·
可再生资源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Yuyuan Xue,Gang Li,Yan Zhang,Yibo Shi,Zhitong Zhao,Jinxiang Dong
The coal-to-ethylene glycol process is attractive to cut down petroleum but suffers from high carbon emissions and energy consumption due to an azeotropic product mixture and complicated refining process. Herein, melt crystallization replacing conventional distillation unit was performed in consideration of the melting point difference between crude glycol components. The process studies of static layer crystallization and suspension crystallization were designed and evaluated. Over 99.90 wt% ethylene glycol was successfully prepared by suspension crystallization followed by mechanical centrifugation at optimizing conditions, therein, the crystal fragmentation induced by centrifugal force was the key factor for removing the trace impurities embedded in the crystal particle. The practical application potential analysis revealed our method could reduce 30.50%, 12.23% and 4.87% of energy consumption, minimum selling price and life cycle greenhouse gas emissions, respectively, compared with the conventional distillation pathway. These findings provided valuable insights into low-carbon and energy-saving coal-to-ethylene glycol technology.
研究领域:
化学工程
·
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2024
·Vol. 26
·期 5
·2763-2772
·
IF 9.3
Lei Guo,Shuaibo Gao,Zuojun Hu,Yongxin Wu,Fangzhao Pang,Huayi Yin,Dihua Wang
Green metal-electrode batteries call for the clean production of s-block metals. Herein, we developed an electrolysis–displacement–distillation (EDD) approach for producing s-block metals with low-carbon emissions and no chlorine gas evolution. The clean production stems from the choice of a molten NaCl–Na2CO3 electrolyte to prevent chlorine gas evolution, an inert nickel-based anode to produce oxygen, and a liquid metal cathode to make the cathodic product (e.g., Na–Sn) sit at the bottom of the electrolytic cell. Later, M–Sn (M = Li, Mg, Ca, Sr, and Ba) alloys were successfully prepared by a displacement reaction between the Na–Sn alloy and molten NaCl–LiCl, NaCl–MgCl2, NaCl–CaCl2, NaCl–SrCl2, or NaCl–BaCl2 with a displacement efficiency of >96.0%. Furthermore, Li, Mg, Ca, Sr, and Ba metals were separated from M–Sn alloys using vacuum distillation with a separation rate of >95.0%. We achieved a current efficiency of 81.0% for the electrolytic production of 100 kg of a liquid Na–Sn alloy, which holds promise to produce s-block metals at a large scale.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）