MINERALS ENGINEERING
·
2022
·
IF 5.479
Xiaoge Wang,Binchuan Li,Jianshe Chen,Shuang Cui,Kuiren Liu,Xiaocai He,Qing Han
This study develops an efficient technique to purify the highly concentrated cyanide-containing industrial wastewater by recovering the valuable components. Firstly, sodium sulfide, sodium polysulfide and ferrous sulfate were respectively used as the precipitating agents to retrieve zinc, copper and iron from wastewater stepwise. In the meantime, cyanide presented as free cyanide and copper–cyanide complexes were transformed into thiocyanate by polysulfide . Afterwards, the solvent extraction of thiocyanate was systematically conducted with trioctylamine (TOA) as the extraction agent and sodium hydroxide solution as the stripping agent. The results showed that the contents of zinc, copper and iron in the solution after precipitation were less than 1 mg·L −1 . Focusing on the reaction between copper–cyanide complex and polysulfide , three stages were established for the first time. In the first stage, Cu(CN) 3 2− was gradually converted to CuCN 0 and thiocyanate was rapidly generated. In the second stage, in addition to the formation of thiocyanate, Cu(I) was oxidized by polysulfide and precipitated as CuS ultimately. With an apparent activation energy of 70.9 kJ∙mol −1 , kinetic analysis of the second stage suggested a significant effect of temperature on the copper–cyanide complex conversion rate. The apparent reaction orders of zero-valent sulfur and cyanide was 1.34 and 2.33, respectively. After the extraction and stripping process, the extraction efficiency of thiocyanate was nearly 100 % and the concentration of it can be enriched to 125 g·L −1 in the stripping solution. TOA and thiocyanic acid formed an extraction complex in a 1:1 ratio. This approach achieves the simultaneous recovery of valuable metallic ions (zinc, copper and iron) and cyanide conversion under the alkaline condition, which provides a new idea for the treatment of highly concentrated cyanide-containing wastewater with a complicated composition.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2022
·
IF 6.76
Zhiwen Xu,Zhiyuan Liang,Huaishuang Shao,Qinxin Zhao
The dioxins and leachable heavy metals in municipal solid waste incineration (MSWI) fly ash made it a hazardous waste. Microwave hydrothermal with four common additives, Na 2 S, Na 2 SiO 3 , Na 2 B 4 O 7 or H 3 BO 3 , was researched at different temperatures, L/S ratios, time and additive concentrations by single factor and orthogonal methods to achieve effective heavy metal stabilization and waste reuse of MSWI fly ash. The samples were investigated by XRD, BET, SEM, ICP-MS to determine the influence of additive-assisted microwave hydrothermal on heavy metals stabilizing. According to the results of the orthogonal study, the degree of influence of each parameter heavy metals stabilization was in the order of additive, temperature, additive concentration, time and L/S ratio. Single-factor experiments suggested that the conditions of 125 °C, 10 min, 3 mol/L Na 2 S and 2 mL/g were enough for the leaching concentration of heavy metals meeting the specified limitation of China. The results of analyses confirmed that microwave hydrothermal treatment with Na 2 S could enhance heavy metals stabilizing by forming zeolites for adsorption, precipitation and convert heavy metals to a more stable state. Microwave hydrothermal with Na 2 S was a promising method to manage MSWI fly ash, which greatly decrease the reaction time and realize wastes utilization.
研究领域:
环境科学
·
废物管理
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Qiming Zhuo,Panpan Wang,Peilun Shen,Penghui Wang,Yongqi Tian,Decheng Chen,Jiushuai Deng,Wenli Liu
With the gradual depletion of copper sulfide resources, efficient flotation technologies for the recovery of copper oxide minerals, such as malachite, have received significant attention. Although sulfidization plays a critical role in malachite flotation, the fundamental theory of sulfidization flotation remains uncertain in the context of practical industrial applications. In this study, evolution of the sulfide product morphology on the malachite surface was observed after treatment with various concentrations of sodium sulfide. In addition, the valence states and phase compositions of the sulfide products were investigated using different X-ray techniques. Furthermore, the evolution of the malachite surface morphology after the formation of a sulfide film was investigated, as were the interaction forces between the malachite and bubbles under the action of butyl xanthate. As a result, it was possible to directly observe the growth process of the sulfide film on the malachite surface, and the presence of Cu(I) was confirmed in the sulfide products. Moreover, the compositions of the sulfide products were investigated using X-ray techniques. The obtained results demonstrated that the sulfide film facilitated the formation of butyl xanthate product layers on the malachite surface, whilst also enhancing the interfacial interaction forces between the malachite and the bubbles.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2015
·
IF 3
Guangyan Tian,Wenbo Wang,Yuru Kang,Aiqin Wang
Palygorskite (PAL) has been recognized as a potential adsorbent for the removal of various dyes from aqueous solution, and so how to enhance its adsorption capability by an efficient approach becomes the subject of great interests. Herein, natural PAL was modified via a simple one-pot hydrothermal process in the presence of sodium sulphide to enhance the adsorption capabilities. The resultant material was characterized by Fourier transform infrared spectroscopy, X-ray diffraction and field-emission scanning electron microscopy, and the adsorption properties were evaluated using methylene blue (MB) as the model dye to explore the synergetic effect of hydrothermal process and sodium sulphide on the structure, physico-chemical features and adsorption properties. It was found that the PAL rod crystal was partially evolved as new silicate with relatively higher adsorption activity. The adsorption capacity for MB evidently enhanced from 129.71 mg/g to 187.56 mg/g after hydrothermal modification, and the adsorption kinetics can be accurately fitted by a pseudo-second-order model. The chemical adsorption is the main driving force for the adsorption process, and the intensified electrostatic and hydrogen-bonding interaction between MB and PAL and the chemical association of –Si–O – groups with MB molecules plays a key role to enhance the adsorption properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Zhengping Ding,Jing Li,Yanqing Huang,Huahui Lin,Peng Wei,Jianbin Li,Xiangqun Zhuge,Zhenzhong Yang,Ke Qu,Yurong Ren
The burgeoning use of lithium-ion batteries (LIBs) creates a growing challenge: spent battery management. Traditional hydrometallurgical recycling with coprecipitation generates massive Na2SO4 wastewater, posing a significant environmental burden. This work presents a novel, closed-loop recycling method for LIB cathode materials that merges electrolysis and hydrometallurgy. Using Na2SO4 electrolysis, we produced high-purity sulfuric acid and sodium hydroxide solutions, which served as the key reagents for leaching and resynthesizing waste cathodes. Optimized leaching conditions ensure near-complete recovery of valuable metals. Li2CO3 and a precursor (Ni0.8Co0.1Mn0.1(OH)2) are subsequently precipitated and regenerated into a new LiNi0.8Co0.1Mn0.1O2 cathode material, which demonstrates excellent electrochemical performance. The spent Na2SO4 solution undergoes a simple treatment before re-electrolysis, achieving a closed-loop system with minimal waste generation and reduced reliance on external reagents. Moreover, the acid-leaching carbon residue is repurposed as a bifunctional carbon-based catalyst for hydrogen peroxide production. This innovative approach offers both economic and environmental benefits, paving the way for sustainable LIBs recycling and a circular economy for battery materials.
研究领域:
材料科学
·
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2019
·
IF 6.395
Hui Liu,Zhenhua Yin,Qian Zhang,Xiumin Li,Keyong Tang,Jie Liu,Ying Pei,Xuejing Zheng,Cem Emre Ferah
Excessive utilization of such sulfides as sodium sulfide always results in serious wastewater pollution in the liming processing of leather manufacture, and thus the critical or optimal consumption of sodium sulfide is necessary. In this work, it was found that the swelling behavior of bovine hides is highly dependent on the liming time as well as temperature and the sodium sulfide concentration. In order to understand the swelling mechanism and optimize the swelling condition, a mathematical model was built based on the response surface methodology (RSM). As a result, the predicted values (Pva) were in good agreement with the experimental values (Eva) by analyzing the absolute as well as relative errors, and the optimized operation conditions were found to be performed in 0.85 wt% Na 2 S solution at 25 °C for 895 min, by which the polysaccharides in hair follicle are dissolve completely and meanwhile the collagen fiber bundles are swollen and disperse very well.
研究领域:
环境科学
·
皮革化学与工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2021
·Vol. 23
·期 33
·5663-5667
·
IF 3.545
Xiaoshuang Chen,Meina Ju,Kun Song,Guoli Chen,Rui Yang,Jinping Wang
Hydrogen generation via water electroreduction is pivotal for exploiting clean-energy skills. Nevertheless, developing a low price and high-performance catalytic activity substance to take the place of expensive precious metal currently in use is still a precedent condition for technology commercialization. In this study, large-scale hierarchical few-layer MoSe2 nanosheets were successfully grown on the surface of sodium sulfide crystals. The water solubility of sodium sulfide makes it advantageous to generate MoSe2 nanolayers via a simple and inexpensive means. The micron-level sodium sulfide crystal surface has a very critical function in the nucleus formation and development of few-layer MoSe2. The ultrathin hierarchical MoSe2 nanolayers obtained using the proposed approach have preferable hydrogen evolution reaction. Furthermore, it is a fascinating technique that the template can be reused without environmental pollution. This research can be used to manufacture other ultrathin hierarchical transition-metal dichalcogenide nanolayers for high-performance many-sided applications.
研究领域:
材料科学
·
电化学
·
能源催化
·
纳米技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Songyang Qian,Zeyu Yuan,Guangshe Li,Dongdong Li,Junzhi Li,Wei Han
The room temperature sodium-sulfur battery has attracted researchers' attention due to its ultra-high energy storage capacity and extremely low cost, but its poor cycling performance and severe dissolution of sodium polysulfide hinder its practical application. Here, we report a stable MXene derived composite sulfur host material based on nickel hydroxide coated with carbon nano network, to achieve the adsorption and conversion of sodium polysulfides. Due to the physical constraints provided by the closed layered structure and the synergistic effect of MXene adsorption and Ni(OH) 2 catalytic activity, the shuttling effect is effectively suppressed. The ex-situ analysis of electrode after reaction shows that the composite material has strong adsorption on polysulfides. In addition, Ni(OH) 2 can also accelerate the reaction process from sulfur to sodium sulfide. Therefore, Ti 3 C 2 T x /Ni(OH) 2 /C/S composite cathode can provide extraordinary reversible capacity 1175.3 mAh/g at 0.22C after 100 cycles and excellent long cycle stability (673.5 mAh/g at 2.2 C with a low decay rate of only 0.032% per cycle over 800 cycles).
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2016
·
IF 4.917
Qing Qing,Linlin Zhou,Qi Guo,Meizi Huang,Yucai He,Liqun Wang,Yue Zhang
Na 3 PO 4 and Na 2 S were employed as efficient alkaline catalysts for the pretreatment of corn stover. To systematically obtain optimal conditions, the effects of critical pretreatment parameters including sodium phosphate concentration (1–4%), sulfidity (0–20%), pretreatment temperature (100–120 °C), and reaction time (20–60 min) on the reducing sugar yield of pretreated substrates were evaluated in a lab-scale using the response surface methodology. Pretreated under the sodium phosphate concentration of 4%, sulfidity of 10%, temperature of 120 °C, and reaction time of 40 min, the reducing sugar yield and glucose yield of the pretreated corn stover achieved 91.11% and 64.01%, respectively, with a moderate enzyme loading of 30 FPU/g substrate. Additionally, a strong correlation (R 2 = 0.971 and R 2 = 0.954) between the delignification and the reducing sugar yield (or glucose yield) was observed by this pretreatment method. These results evidently support that the combined Na 3 PO 4 -Na 2 S pretreatment is an effective and feasible method for processing lignocellulosic biomass.
研究领域:
生物技术
·
生物质能
·
酶解技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Li Yang,Yu-Xi Feng,Yu-Juan Lin,Xiao-Zhang Yu
Various environmental contaminants can find their way to enter plant cells and disturb and/or damage the essential components of PSII repair cycle in chloroplast, thereby resulting in dysfunction of chloroplast. In the current research, a microcosm hydroponic experiment was set up to evaluate the comparative effects of sodium hydrosulfide (NaHS)- and proline (Pro)-mediated functional repairing of chloroplast in rice plants under SCN − stress. Our results displayed that when exposed to environmental realistic SCN − concentrations (24–300 mg L −1 ), foist significant ( p < 0.05) gene-dose repercussion on the pathways of photosynthetic reactions and energy metabolism in rice shoots, and a downturn in the level of total soluble starch, sugar, and chlorophyll. Sodium hydrosulfide application effectively mitigated ( p < 0.05) the toxic effects of SCN − in rice seedlings by stimulating the processes of phosphorylation, dephosphorylation and new-synthesis of D1 protein in the PSII repair cycle, and increased the turnover of D1 protein to recover CO 2 assimilation. Evidently, Pro treatment mainly enhanced ( p < 0.05) the expression of magnesium chelatase (MgCh) and ribulose-1,5-bisphosphate carboxylase (Rubisco) related genes under simulated SCN − stress, suggesting that the targeted repairing site in chloroplast by Pro was different from NaHS. The outcome of the present research contributes to a better understanding at molecular level for repairing of chloroplast functional disorder by NaHS and Pro at different key nodes under SCN − stress.
研究领域:
植物学
·
环境科学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL MANAGEMENT
·
2020
·Vol. 65
·期 6
·818-828
·
IF 2.561
Zhou Changrui,Yuan Haiyan,Ning Chuanchuan,Li Shuailin,Xia Zhuqing,Zhu Mengmeng,Ma Qiang,Yu Wantai
Using amendments is a cost-effective method to soil cadmium (Cd) remediation, whereas knowledge about how different amendments and rates affect remediation efficiency remains limited. This study aimed to evaluate the impacts of different types and amounts of amendments on soil Cd immobilization and its uptake by plants. Biochar (BC), zeolite (ZE), humic acid (HA), superphosphate (SP), lime (L), and sodium sulfide (SS) were applied at three rates (low, medium, and high) ranging from 0.5 to 5%. The concentration of CaCl 2 -extractable Cd was considerably affected by the amendments, except HA, and the high doses achieved better immobilization effects than the low doses did. The addition of amendments decreased weak acid soluble Cd by 4.1–44.0% but slightly increased the fractions of oxidizable and residual Cd. These amendments (except BC and HA dose of 1%) decreased Cd accumulation in grains by 1.3–68.8% and (except SP) in roots by 16.3–65.5% compared with the control. The SP efficiently immobilized Cd but posed a potential soil acidification risk. Moreover, SS treatment increased the soil electrical conductivity (EC) value and restricted the growth of wheat, possibly due to high-salt stress. BC, ZE, and L exerted significant effects on the reduction in available Cd as the application rate increased. These amendments enhanced Cd immobilization mainly by changing Cd availability in soil and influencing its redistribution in different fractions in soil and root uptake by plants. This study concluded that BC-5%, ZE-1%, and L-0.5% can be used for Cd immobilization in acidic or neutral soils.
研究领域:
环境科学
·
农业科学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Neuroinflammation
·
2017
·Vol. 14
·期 1
·1-18
·
IF 5.102
Zhao Hengli,Pan Pengyu,Yang Yang,Ge Hongfei,Chen Weixiang,Qu Jie,Shi Jiantao,Cui Gaoyu,Liu Xin,Feng Hua,Chen Yujie
Background Emerging studies have demonstrated the important physiological and pathophysiological roles of hydrogen sulphide (H2S) as a gasotransmitter for NOD-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome-associated neuroinflammation in the central nervous system. However, the effects of H2S on neuroinflammation after intracerebral haemorrhage (ICH), especially on the NLRP3 inflammasome, remain unknown.Methods We employed a Sprague–Dawley rat of collagenase-induced ICH in the present study. The time course of H2S content and the spatial expression of cystathionine-β-synthase (CBS) after ICH, the effects of endogenous and exogenous H2S after ICH, the effects of endogenous and exogenous H2S on NLRP3 inflammasome activation under P2X7 receptor (P2X7R) overexpression after ICH, and the involvement of the P2X7R in the mechanism by which microglia-derived H2S prevented NLRP3 inflammasome activation were investigated.Results We found ICH induced significant downregulation of endogenous H2S production in the brain, which may be the result of decreasing in CBS, the predominant cerebral H2S-generating enzyme. Administration of S-adenosyl-l-methionine (SAM), a CBS-specific agonist, or sodium hydrosulfide (NaHS), a classical exogenous H2S donor, not only restored brain and plasma H2S content but also attenuated brain oedema, microglial accumulation and neurological deficits at 1 day post-ICH by inhibiting the P2X7R/NLRP3 inflammasome cascade. Endogenous H2S production, which was derived mainly by microglia and above treatments, was verified by adenovirus-overexpressed P2X7R and in vitro primary microglia studies.Conclusion sThese results indicated endogenous H2S synthesis was impaired after ICH, which plays a pivotal role in the P2X7R/NLRP3 inflammasome-associated neuroinflammatory response in the pathogenesis of secondary brain injury. Maintaining appropriate H2S concentrations in the central nervous system may represent a potential therapeutic strategy for managing post-ICH secondary brain injury and associated neurological deficits.
研究领域:
神经科学
·
药理学
·
炎症
·
神经病学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）