HYDROMETALLURGY
·
2022
·
IF 4.217
Wenbo Li,Runnan Guo,Yanjun Li,Zhenhai Dong
In this study, we developed a new method for the efficient extraction and separation of V from direct acid leaching solutions of weathered crust V Ti magnetite using N235/TBP, sodium sulfate (Na 2 SO 4 ), and sodium carbonate (Na 2 CO 3 ) as the extraction system and washing and stripping agents, respectively. The effects of various experimental conditions on the extraction results were investigated, and the extraction efficiency of V was approximately 70% with <4% Fe co-extraction under optimal conditions. A four-stage countercurrent extraction method was used to extract >96% of V and <4.5% of Fe, and the separation factor of V/Fe was 541. Upon washing the V-loaded organic phase with a 0.70 mol/L Na 2 SO 4 solution, >96% of Fe and ~1% of V were removed. Moreover, upon stripping the purified organic phase with a 0.70 mol/L Na 2 CO 3 solution, >98% of V was recovered. The effects of other impurities on the separation of V were negligible. Moreover, the stripped organic phase can be recycled sustainably during extraction. In this study, we selectively separated V and provided a new method for accelerating the purification and enrichment of V, which is present at low concentrations in acid leaching solutions.
研究领域:
冶金学
·
化学工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jieli Peng,Yongxing Zheng,Zhenxing Wang,Zhe Dai,Ziqi Guo
In this study, an innovative method was proposed to treat ilmenite by using sodium persulfate (Na 2 S 2 O 8 ) as a surface activator to enhance the flotation of ilmenite. The action mechanism of Na 2 S 2 O 8 on the ilmenite surface was investigated by micro-flotation, adsorption tests, powder contact angle, zeta potential detection, Fourier transform infrared spectroscopy (FT-IR) analysis and X-ray photoelectron spectroscopy (XPS) analysis. Micro-flotation experiments showed that recovery of the ilmenite was effectively enhanced in the pH range of 4.0 ∼ 10.0 by adding Na 2 S 2 O 8 . The adsorption tests illustrated that the introduction of Na 2 S 2 O 8 effectively enhanced the adsorption of NaOL on the surface of ilmenite. The powder contact angle tests presented that the contact angle of samples increased after treatment with Na 2 S 2 O 8 and NaOL. The zeta potential testing results showed that surface potential of the ilmenite treated with Na 2 S 2 O 8 and NaOL was negatively migrated in the pH ranging from 3.5 to 10.0, revealing that the mineral surface adsorbed more oleic acid anions. FT-IR analyses suggested that the chemical adsorption of oleic acid on the surface of ilmenite was enhanced after treating with Na 2 S 2 O 8 . XPS analyses revealed that the addition of Na 2 S 2 O 8 induced a transformation of Fe (+Ⅱ) into Fe (+Ⅲ) and enhanced adsorption of NaOL on the ilmenite surface. A reaction model of Na 2 S 2 O 8 interacting with the surface of ilmenite was proposed to interpret the activation mechanisms.
研究领域:
矿物加工工程
·
化学工程
·
材料科学
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产品关联
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2022
·Vol. 24
·期 17
·10394-10407
·
IF 3.945
Jing Xiao,Cong Wang,Bai-Qi Feng,Tian-Yu Liu,Shao-Yi Jia,Hai-Tao Ren,Yong Liu,Song-Hai Wu,Xu Han
Although synthesis of oligoaniline (OANI) by persulfate and aniline has been investigated in the recent years, the impact of phenol on the synthesized soluble OANI is still not clear. In this study, our results indicate that phenol and pH mediate the production of the blue water-soluble OANI (OANIblue) in the reaction between sodium persulfate (SPS) and aniline under alkaline conditions, and the yields of OANIblue increase with increasing concentrations of phenol and pH values. Quenching experiments rule out the contributions of SO4˙− and ˙OH to aniline oxidation and imply that the non-radical activation of SPS is an important pathway in the formation of OANIblue. MALDI-TOF-MS analysis indicates that phenol apparently inhibits the polymerization degree of aniline in that the molecular weights of OANIblue gradually decrease from 1586.4 to 684.6 when phenol is increased from 0 to 2.0 mM. FTIR and Raman analyses confirm the structure of aniline oligomers in OANIblue and indicate that phenol inhibits the phenazine-like structure in OANIblue and facilitates the transformation of benzenoid rings to quinoid rings in the oxidation products. However, simultaneous activation of SPS by phenol and aniline is likely to occur in the reaction system with the formation of PhNH˙, as indicated by DFT calculations. The high scavenging reactivity of phenol towards both PhNH2˙+ and PhNH˙ implies that PhNH2˙+ and PhNH˙ are not the intermediates in the formation of OANIblue. DFT calculations also reveal that apart from the one-electron transfer pathway between aniline and SPS, the two-electron transfer pathway is also likely to occur in the presence of phenol, resulting in the formation of PhNH+/PhN˙˙ without producing PhNH2˙+ and PhNH˙. The produced PhNH+/PhN˙˙ intermediates then couple with aniline, PhNH+, aminophenyl sulfate and its hydrolysate to form dimers, trimers, oligomers, and eventually OANIblue. This study not only describes a novel method to prepare water-soluble OANI, but also gives new insight on the importance of phenol in the production of OANIblue.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Animal Nutrition
·
2025
·
IF 7.5
Manman Fan,Jinming Hu,Cheng Liu,Shuo Zhang,Yufeng Liu,Guangyong Zhao
Taurine is a sulfur-containing nonproteinogenic amino acid. Recent studies have shown that taurine can improve rumen microbial crude protein (MCP) synthesis. This experiment aimed to investigate the action mechanism of taurine on rumen MCP synthesis and nitrogen (N) metabolism in beef steers using sodium sulfate (Na 2 SO 4 ) as a contrast. Six steers (bodyweight 506 ± 17 kg) were assigned to three experimental groups including a basal diet (control), a basal diet supplemented with 45 g taurine/d or 50 g Na 2 SO 4 /d, and were allocated in a replicated 3 × 3 Latin square design. The amounts of sulfur from taurine and Na 2 SO 4 were equal (11.38 g/d). The results showed that, compared with the control group, both taurine and Na 2 SO 4 increased ruminal production of MCP ( P < 0.05) by 37.50% and 29.17%, respectively, and increased the concentration of sulfide (S 2- ) ( P < 0.001). Both taurine and Na 2 SO 4 increased the digestibility of neutral detergent fiber ( P < 0.05). Taurine tended to increase ( P = 0.087) while Na 2 SO 4 decreased plasma urea concentration ( P = 0.049), with the taurine group exhibiting higher plasma urea concentrations than the Na 2 SO 4 group ( P = 0.003). Taurine did not affect urinary urea excretion ( P = 0.246) whereas Na 2 SO 4 decreased urinary urea excretion compared with the control group ( P = 0.002). Compared with the control group, both taurine and Na 2 SO 4 increased urinary allantoin excretion ( P < 0.05), total purine derivatives excretion ( P < 0.05), and the estimated rumen microbial N flow ( P < 0.05). The urinary urea excretion of the taurine group was higher than the Na 2 SO 4 group ( P = 0.019). Compared with the control group, taurine did not affect N excretion, N retention (NR) or N utilization efficiency (NUE) ( P > 0.10), but Na 2 SO 4 decreased urinary N excretion ( P = 0.018) and total N excretion ( P = 0.024), and increased NR ( P = 0.024) and NUE ( P = 0.022). No differences were found in NR and NUE between the taurine and Na 2 SO 4 groups ( P > 0.10). Taurine improved ruminal MCP synthesis by enriching the pathways associated with sulfur and amino acid metabolism while Na 2 SO 4 improved ruminal MCP synthesis by enriching pathways related to nucleotide and purine metabolism. In summary, both taurine and Na 2 SO 4 improved ruminal MCP synthesis by modulating different pathways. Taurine was less effective in decreasing total N excretion than Na 2 SO 4 but no differences in NR and NUE were found between the two groups of beef steers.
研究领域:
动物营养学
·
畜牧学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Liangzhu Pan,Xiaoping Zhang,Songwen He,Guichang Zhang,Wei Xu
Gold is one of the most fascinating resources in the waste mobile phones’ printed circuit boards (WMPPCBs). In this study, a new process for recovering Au from WMPPCBs by the Na 2 S 2 O 8 -KI system was developed. This process comprises a two-stage leaching process to provide a separation of copper and gold from WMPPCBs. 98% Cu and 78% Fe were dissolved by the 1st base metals' leaching (H 2 SO 4 -H 2 O 2 leaching) step. The leaching of gold from the solid reside of 2nd leaching step was performed to study the effect of Na 2 S 2 O 8 concentration, KI concentration, temperature, and solid-liquid ratio in Na 2 S 2 O 8 -KI leaching system. The results showed that removing most of Cu greatly promoted the leaching efficiency of gold in Na 2 S 2 O 8 -KI leaching system. The mechanism of gold leaching was studied by the thermodynamic analysis. Leaching kinetics data showed that gold leaching followed an intermediate-controlled mechanism with E a , 30.3 kJ mol −1 . The best conditions for leaching of gold in Na 2 S 2 O 8 -KI system were determined to be 0.02 M Na 2 S 2 O 8 , 0.15 M KI, 40 ℃, a solid-liquid ratio of 1: 20 (g/mL), and a stirring speed of 200 rpm. Under the optimal leaching parameters, the efficiency of gold leaching from WMPPCBs attained 96% after 120 min. Due to the non-toxic and low-cost properties of Na 2 S 2 O 8 , the Na 2 S 2 O 8 -KI leaching process is more sustainable than conventional processes (cyanide leaching et al.).
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2019
·Vol. 9
·期 3
·280
·
IF 3.444
Ruijia Lan,Wenbin Su,Jitai Li
A classic carbon material—expanded graphite (EG), was prepared and proposed for a new application as catalysts for activating peroxydisulfate (PDS). EG samples prepared at different expansion temperatures were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and other methods. It was observed that there existed a remarkable synergistic effect in the EG/PDS combined system to degrade Acid Red 97 (AR97). Unlike other carbon material catalysts, sp2carbon structure may be the main active site in the catalytic reaction. The EG sample treated at 600 °C demonstrated the best catalytic activity for the activation of PDS. Degradation efficiency of AR97 increased with raising PDS dosage and EG loadings. The pH of aqueous solution played an important role in degradation and adsorption, and near-neutrality was the optimal pH in this research. It was assumed that the radical pathway played a dominant role in AR97 degradation and that oxidation of AR97 occurred in the pores and interface layer on the external surface of EG by SO4·−and ·OH, generated on or near the surface of EG. The radical oxidation mechanism was further confirmed by electron paramagnetic resonance spectroscopy. The EG sample could be regenerated by annealing, and the catalytic ability was almost fully recovered.Keywords:sodium peroxydisulfate;expanded graphite;mechanism;degradation;acid red 97
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 132
·期 2
·1211-1224
·
IF 2.081
Zhang Long,Ge Jianhua,Zhuang Tao,Ding Xiulong,Zheng Xuyang
A series of novel sodium persulfate (Na 2 S 2 O 8 ) modified g-C 3 N 4 photocatalysts were prepared in this study to enhance nitrogen fixation. Characterization results found that the type of precursors and the mass ratio affect the crystal structure, morphology, and optical properties of the modified g-C 3 N 4 . The photocatalysts exhibited considerable nitrogen vacancies (N Vs ) depending on the nature of the different precursors and their mass ratios to Na 2 S 2 O 8 . In addition, the production rate of ammonia of the modified g-C 3 N 4 was significantly higher than that of pure g-C 3 N 4 under optimal conditions. The four cycles show modified g-C 3 N 4 excellent stability. Combined with the results of pH test, the possible mechanism of the photocatalytic nitrogen fixation process using modified g-C 3 N 4 was proposed.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
DESALINATION
·
2022
·
IF 11.211
Xiaowen Huo,Zhaojing Jing,Haitao Wang,Na Chang
Nanofiltration membranes based on polyamide (PA) are widely used in fields such as brackish water desalination and drinking water purification due to their excellent retention of multivalent salts. However, uncontrolled and extremely fast polymerization easily produces thicker PA layers, which reduces permeability. Moreover, smooth support layer usually leads to PA layers with low roughness, which is not benefit for improving of flux. Based on these aspects, an innovative method of co -regulating interfacial polymerization based on anionic surfactant sodium dodecyl sulfate (SDS) and carbonized-UIO-66 (C-UIO-66) nanoparticles has been reported. The adsorption of anionic surfactant on the surface of C-UIO-66 slows down the diffusion rate of aqueous monomer and helps to form thin PA layer (<33 nm) which is thinner than the original thin film composite (TFC) membrane (144.29 ± 17.62 nm). Besides, C-UIO-66 nanoparticles with different sizes are deposited on the surface of the support layer, providing rougher surface for interfacial polymerization. Due to the irregular surface of SDS/C-UIO-66 intermediate layer, the prepared PA layer has folded structure. Compared with original TFC membrane, the preferred thin film nanocomposite (TFN) nanofiltration membrane possesses permeation flux of 58.59 L·m −2 ·h −1 , which increased by 114.3 % together with the maintaining the rejection rate of Na 2 SO 4 above 96 %.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 85
·期 6
·1813-1823
·
IF 2.43
Zhong Dan,He Fu,Ma Wencheng,Wu Yichuan,Dong Jiaju
In this study, we investigated using the main composition of pipe deposits from water distribution networks as catalyst to activate dual-oxidant H 2 O 2 /Na 2 S 2 O 8 system to produce radicals for perchloroethylene and chloramphenicol removal. According to the results, the degradation efficiency of perchloroethylene by H 2 O 2 /Na 2 S 2 O 8 system was 92.05% within 8 h. Due to the slow conversion between ≡Fe 3+ and ≡Fe 2+ , the hydroxylamine was introduced to reduce reaction time. As for the results, the degradation efficiency of chloramphenicol in the H 2 O 2 /Na 2 S 2 O 8 system with hydroxylamine assistance was 73.31% within 100 min. Meanwhile, several key affecting factors and the kinetic models were investigated. The primary radicals were identified by electron paramagnetic resonance and radical scavenging tests. Eleven degradation products were confirmed by high-resolution liquid chromatography-mass spectrometry. The result of this study provided the theoretical basis for resource utilization of pipe deposits in water treatment in case of emerging contamination events.
研究领域:
环境科学
·
水处理
·
材料化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Hui Dang,Zhidong Chang,Xue Wu,Sihang Ma,Yifei Zhan,Na Li,Wenbo Liu,Wenjun Li,Hualei Zhou,Changyan Sun
Effectively extracting lithium at a relatively low temperature from the slag produced by the pyrometallurgical treatment of spent lithium-ion batteries remains a great challenge, which limits the acquirement of lithium. Herein, we proposed a eutectic system to roast slag at a lower temperature based on sodium sulfate–sodium chloride (Na 2 SO 4 –NaCl) binary eutectic salts. The optimal roasting conditions are as follows: the slag was roasted at 750 °C with a (SO 4 2– +Cl – )/Li + molar ratio of 5:1 for 120 min. Followed by aqueous leaching 5 min at room temperature with a water/roasted samples mass ratio of 30:1, it can get 97.07% lithium extraction efficiency.
研究领域:
冶金学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2024
·Vol. 64
·期 8
·3488-3504
·
IF 3.2
Lubing Xiang,Xi Yu,Aimin Xiang,Xiaoying Lu,Meng Zhang,Hongfu Zhou
In this work, porous poly (vinyl alcohol) (PVA) hydrogels with different pore sizes were fabricated using inorganic non-metallic porogens by an environmentally friendly method, providing a potential solution for the field of wastewater treatment. PVA hydrogels have gained much attention in the field of wastewater treatment due to their excellent adsorption performance and porous network structure. However, the employment of inorganic non-metallic salts as porogens for PVA hydrogels has received limited attention so far. In this study, porous PVA hydrogels were prepared by freeze-thawing and freeze-drying with sodium sulfate (Na 2 SO 4 ) and calcium carbonate (CaCO 3 ) as porogens. PVA-Na exhibited denser network structure with the concentration of Na 2 SO 4 solution increased, and the tensile stress was enhanced by about 45 times. Meanwhile, the tensile stress of PVA-Ca was improved significantly from 0.06 to 1.67 MPa, and the network structure became looser after adding CaCO 3 . Moreover, a comprehensive investigation was conducted on the adsorption performance of porous PVA hydrogel for Congo red (CR). Finally, five adsorption models were fitted to investigate the adsorption mechanism of porous PVA hydrogels, in which the maximum adsorption capacity of CR by PVA-Na-0.5 was predicted to be 215 mg/g by the Langmuir isothermal model fitting. Highlights The structure of PVA hydrogels was adjusted by Na 2 SO 4 and CaCO 3 , respectively. The tensile stress of PVA-Na with dense network structure increased 45 times. Compared to PVA-FD, swelling equilibrium time of PVA-Na reduced from 24 to 6 h. Equilibrium swelling rate of PVA-Ca declined by half in comparison to PVA-FD. Langmuir isothermal model predicted q max of 215 mg/g for CR by PVA-Na-0.5.
研究领域:
材料科学
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环境科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
Asia-Pacific Journal of Chemical Engineering
·
2024
·Vol. 19
·期 4
·e3074
·
IF 1.4
Fangqin Lu,Lingyun Liu,Chuilei Kong,Hongyu Zhao
Addressing the issue of processing fine kaolinite and quartz particles in coal slime, this study utilized molecular simulation and Density Functional Theory (DFT) to investigate the chelate adsorption characteristics of sodium dodecyl sulfate (SDS) on kaolinite surfaces. As a major clay mineral component in coal slime, kaolinite reduces coal's calorific value but holds potential for industrial and agricultural applications. The research identified distinct interactions between SDS and the tetrahedral Si O layer and octahedral Al O layer of kaolinite, in contrast to quartz, which contains only the tetrahedral Si O layer. This difference is crucial for the effective separation of kaolinite from quartz. The study focused on analyzing SDS adsorption on the (001) and (00-1) planes of kaolinite. The findings revealed strong adsorption of SDS on kaolinite surfaces, especially on the (001) plane, evidenced by significant charge transfer indicating efficient chelation. This effect results from the interaction of SDS's electron-donating atoms (such as S and O) with the metal atoms on the surface of kaolinite. Adsorption strength was quantified through adsorption energy calculations, showing a stronger interaction on the (001) surface. Experimental validations, including single mineral flotation experiments and infrared spectroscopic analysis, further corroborated the simulation outcomes. These tests demonstrated improved flotation recovery of kaolinite in the presence of SDS and with reduced particle size. Infrared analysis revealed that SDS selectively and strongly adsorbs on kaolinite surfaces, as indicated by diminished hydroxyl group stretching vibrations in the FTIR spectrum and changes in absorption peaks related to inorganic vibrations and sulfonic acid groups. The study demonstrates that SDS can selectively and effectively adsorb onto kaolinite surfaces, particularly on the (001) plane, facilitating the efficient extraction of fine kaolinite from coal slime. This research holds significant potential for enhancing the utilization of resources from coal slime in the coal industry, offering both economic and environmental benefits.
研究领域:
矿物加工工程
·
表面化学
✓ 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）