PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Junyun Cheng,Chenruobing Zhang,Jie Lin,Yeqiu Zhao,Yu Huang,Meiqing Shi,Zhiqi Zhu,Liyuan Chai,Xu Yan,Qingwei Wang
The coking industry generates hazardous desulfurization waste liquid (DWL), which contains abundant sulfur-containing salts such as ammonium thiocyanate (AT), ammonium sulfate (AS), and ammonium thiosulfate. However, improper handling of DWL poses severe environmental risks. Conventional treatment methods, including high-temperature pyrolysis, chemical precipitation, and evaporation crystallization, suffer from critical limitations: low sulfur recovery rates (typically 40%–70%), high operational costs, and insufficient product purity. To address these challenges, this study innovatively proposes an evaporation-cooling pretreatment process guided by the NH₄SCN-AS-H₂O ternary phase equilibrium system. For the first time, this method achieves ultra-high-purity products: ammonium thiocyanate (AT) at 98.54% purity and ammonium sulfate (AS) at 99.92% purity, with a total sulfur recovery rate of 90.92%—40% higher than traditional approaches. Additionally, the mixed salt (MS) byproduct undergoes solvent crystallization to yield secondary products with purity exceeding 99.96%, eliminating the need for toxic reagents. By integrating phase diagram-guided optimization with streamlined operational procedures, this process significantly reduces costs while ensuring environmental sustainability, thereby establishing a novel pathway for resource recovery from DWL.
研究领域:
环境工程
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化工技术
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资源回收
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yanqin Hu,Ben Qin,Xiaoyan Li,Fan Yang,Chuan-Pin Lee,Meiying Xie,Liyan Xue
With the development of nuclear energy, the reprocessing of 99TcO4–/ReO4– has become a very difficult problem due to environmental issues such as high output, long life, and easy leakage. In this study, three extraction systems containing carbamic acid were introduced into the reprocessing of 99TcO4–/ReO4– for the first time. The results involving one of the three results show that N-[N,N-di(2-ethylhexyl) aminocarbonylmethyl] glycine (D2EHAG) has ultrahigh selectivity for removal to 99TcO4–/ReO4–. When the extreme concentration ratio of SO42– and Cl– to ReO4– of D2EHAG is 10,000:1, the distribution coefficient of ReO4– still reaches 12.73 and 2.67, respectively. Additionally, the most hydrophilic NO3–, when the extreme concentration ratio of NO3– and ReO4– is 1000:1, still has a distribution coefficient close to 2.33, which is more than the most reported MOF adsorption materials. Moreover, the reaction kinetics, stripping rate, and reuse rate were studied. After five cycles, the removal rate is still 98.12%, with a decrease of less than 0.7%. The system containing carbamic acid is a potential extraction removal system to remove 99TcO4–/ReO4– from nuclear radioactive wastewater.
研究领域:
环境科学
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核化学
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放射性废物管理
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 330
·期 3
·1271-1280
·
IF 1.371
Zhu Hui,Zhou Jian,Ding Pingping,Liao Hui,Jin Yifan,Ding Weicheng
In this work, a novel honey/bayberry (HSHB) microsphere was prepared via a simple and green hydrothermal method to investigate the UO 2 2+ adsorption behavior in simulated nuclear effluent. The results showed that spherical HSHB (about 40 nm) had the maximum adsorption capacity of 271.00 mg/g at 328.15 K and displayed a desirable selectivity for the UO 2 2+ . Furthermore, combined with the characterization analysis and adsorption experimental results, the phenolic hydroxyl group of HSHB could be combined with UO 2 2+ through chelation. Therefore, these facts indicate that HSHB could be used as a low-cost and environmentally friendly adsorbent for UO 2 2+ removal from nuclear effluent.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Energy Science & Engineering
·
2018
·Vol. 6
·期 5
·437-447
·
IF 3.553
Chunhua Dong,Xingfu Song,Jie Zhang,Evert Jan Meijer,Hang Chen,Jianguo Yu
A thermal dissociation process (ideally, 100% atom utilization) to regenerate the amine extractant and to produce gaseous HCl which is the key to realizing the CO 2 mineralization with metal chloride waste liquids was investigated. Solvent effects on the thermal dissociation of tri-n-octylamine hydrochloride (TOAHCl) were predicted to be prominent via analyzing structure parameters, charge distribution, solvation free energy, apparent basicity, and N-H frequency with the help of molecular simulation and experiments. Inert solvents with low polarity such as decalin, dodecane were favorable in thermal dissociation experiments. In particular, decalin enhanced the dissociation most effectively which is in agreement with the prediction. In dilute solutions, the thermal dissociation kinetics was shown to be first order. The apparent reaction rate (3.0 × 10 −4 −1.5 × 10 −2 min −1 ) and activation energy (58.219-121.827 kJ/mol) differ a lot at 180-190°C in various solvents, confirming a strong solvent effect. A two-stage reaction scheme in dilute solutions has been proposed from the experimental study. The overall process is entropically driven, with the removal of HCl into gas phase from the solvated state. The work could offer a fundamental direction for the further actual process.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 47
·24044-24053
·
IF 6.895
Jie Zhang,Lihong Zhou,Zhimin Jia,Xiaofeng Li,Yue Qi,Chuting Yang,Xinghua Guo,Shanyong Chen,Honghan Long,Lijian Ma
The separation and recovery of key nuclides such as uranium and plutonium from effluents related to nuclear industry is of great significance for alleviating the shortage of nuclear energy resources and protecting the environment and human health. However, the high temperature, strong acidity and radioactivity of the nuclear effluents pose a severe challenge to the separation materials used in such conditions. The diversity of structure, flexibility of design, and excellent physicochemical stability of covalent organic framework materials (COFs) provide the possibility for the directional design and preparation of adsorbents for use under harsh conditions. Herein, three COFs with similar structure, different pore sizes and connecting modules were synthesized. The ingenious structure predesign enables Dp-COF to have three carboxyl groups oriented toward the pore center and laid out in appropriate spatial positions, which builds hydrogen-bonding bridges between carboxycarbonyl and hydroxyl groups, and thus constructs for the first time a unique COF material with a double-ring pore. The inner pore size of the “double-ring” is slightly larger than the diameter of uranyl hydrate, which leads to a size-matching adsorption of uranium by Dp-COF, thus greatly reducing the effect of protonation. Even in the simulated spent fuel reprocessing liquid with pH = 1.0, the adsorption capacity of Dp-COF for uranium can reach 66.3 mg g−1, and the adsorption capacity reaches 317.3 mg g−1 at pH = 4.5, which is very rare among the reported COFs. More excitingly, the removal rate for uranium reaches up to an unprecedented 99.8% due to the size-matching effect, more than any analogous adsorbents. This study not only proposes new ideas for the design and regulation of the microscopic configuration of COF materials, but also provides an alternative approach for the preparation of efficient uranium adsorbents.
研究领域:
材料科学
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环境科学
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核能工程
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Zeqian Zhang,Pengcheng Wu,Jiayi Liu,Qing Li,Liancheng Hu,Yida Wu,Qiongying Kong,Xiangyang Yuan,Xiaowei Li,Yimin Cai,Lihua Yuan,Wen Feng
Palladium (Pd) capture from high-level liquid waste for subsequent photocatalytic applications is desirable for the development of nuclear energy and the reutilization of valuable resources. Herein, we approach our design with a unique porous organic polymer containing thiazolo[5,4-d]thiazole units (denoted as TzPOP–OH). It possesses two potential soft–hard (N–O and S–O) combined coordination sites for Pd(II) coordination and features strong donor–acceptor repeating units and high planarity of linkage enforced by hydrogen bonds for subsequent photocatalysis. Accordingly, TzPOP–OH with three hydroxyl groups on the linkage exhibits a high Pd(II) capacity of 369 mg g–1 at 3 M HNO3, considerably surpassing those of the controlled polymer TzPOP without hydroxyl groups and most other reported materials. Additionally, TzPOP–OH boasts other merits, including outstanding acid tolerance, extraordinary radiation stability, good reusability, and remarkable selectivity. After palladium adsorption, Pd@TzPOP–OH demonstrates impressive photodegradation efficiency to reduce the concentration of rhodamine B in contaminated urban water from 10 to less than 0.1 ppm. This work provides a feasible approach to designing materials with both suitable coordination microenvironments and semiconductor properties for metal separation and photocatalysis.
研究领域:
材料科学
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环境科学
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核能技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Guanqing Hu,Qingguo Zhang,Yongde Yan,Yun Xue,Fuqiu Ma,Yuelin Wang,Xin Liu,Jinlong Song
With the rapid development of the global nuclear industry, substantial amounts of radioactive tributyl phosphate (TBP) have accumulated during the PUREX process. Prolonged accumulation poses significant environmental risks. Therefore, this study proposes an efficient molten salt oxidation (MSO) method for the treatment of gelled TBP. Comprehensive thermal analysis data indicate that the oxidation process of gelled TBP primarily consists of three stages. The composition of the waste salts after the MSO process was analyzed using X-ray diffraction spectroscopy. Fourier transform infrared spectroscopy revealed that the primary functional groups in gelled TBP were progressively degraded with increasing temperature. Scanning electron microscopy clearly illustrated the decomposition process of gelled TBP. X-ray photoelectron spectroscopy results identified the predominant forms of residual substances. The generated exhaust gas was analyzed using gas mass spectrometry and chromatography. Additionally, through DFT calculations of TBP, the possible reaction mechanism of TBP in the molten salts was deduced. In the molten state, carbonate can effectively absorb P 2 O 5 and eventually form stable NaPO 3 , which is the reason for the 94.90 % retention rate of phosphorus element. During the experimental process, the degradation rate of gelled TBP reached as high as 99.99 %. The MSO method proposed in this study shows great potential for the treatment of liquid organic waste.
研究领域:
核化学与化工
·
环境科学
·
计算化学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 19
·8660-8666
·
IF 2.7
Deyan Yu,Baole Li,Zhi Cao,Qi Chen,Chen Zuo,Tiansheng He,Taihong Yan,Weifang Zheng
The 5 wt% Ru/AC catalysts were prepared using the impregnation method. The catalysts were characterized by N2 physical adsorption, XRD, SEM, EDX, TEM and ICP-AES. The catalytic activity and stability of the catalysts in decomposing hydroxylamine nitrate (HAN) and hydrazine nitrate (HN) in nitric acid were evaluated. The results demonstrated that the Ru/AC catalyst effectively decomposed HAN and HN with complete conversion under moderate reaction conditions (60–90 °C). When used for an extended duration of 1580 hours in radioactive nitric acid waste liquid, this catalyst displayed a remarkable processing capacity of 6.32 kilograms per gram of catalyst. Due to its environmentally friendly nature resulting from harmless gas product formation along with its simple device structure design, this protocol offers practicality and economic attractiveness.
研究领域:
环境科学
·
化学工程
·
核能技术
✓ 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）