Journal of Sustainable Metallurgy
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2023
·Vol. 9
·期 1
·294-302
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IF 2.4
Liao Chengxu,Liu Lin,Shi Zuolong,Zhang Xinfeng,Zou Li,Chen Zhihui,Liu Yawen,Sun Yonghua
The recycling of mineral tailings is an important research topic. In this work, composite material was prepared using vanadium titanomagnetite (VTM) tailings, kaolin and sodium silicate, and used as a photocatalyst for photocatalytic degradation organic dyes. The results showed that the photocatalytic material has good photocatalytic performance on the degradation of rhodamine B in solution within a few minutes. The synthesized materials were characterized by XRF, XRD, FT-IR and SEM. The effects of solution pH and preparation conditions on the photocatalytic degradation efficiency were also investigated in detail. The results indicated that it was feasible to transform the VTM tailings into photocatalysts, and provided an idea for the comprehensive utilization of VTM tailings. Graphical Abstract
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高影响因子
ENERGY
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2022
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IF 8.857
Yanzhen Liu,Qingping Li,Xin Lv,Lei Yang,Junfeng Wang,Fen Qiao,Jiafei Zhao,Huiping Qi
Among deep-sea oil and gas transportation, kinetic inhibitors of gas hydrates are widely added in transportation pipelines to prevent gas hydrates from clogging pipelines. Unfortunately, the micro-and nano-sized clay particles will enter the wellbore to adsorb the practical components of the inhibitors, thereby weakening the inhibitory effect of the inhibitors on hydrates. This work shows that 1:1-type layered silicates can only adsorb inhibitors through the surface, while 2:1-type layered silicates can adsorb inhibitors through both surface and intercalation. The clay particles with adsorbed inhibitors tend to be aggregated and settled because the surface charge density and the potential energy between the particles are reduced. Meanwhile, the inhibitors adsorbed on the surface of the clay lose their inhibitory effect on gas hydrates. Therefore, the suppression effect of layered silicate minerals on inhibitors should be considered in clay-rich oil and gas transportation pipelines.
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ENGINEERING GEOLOGY
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2023
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IF 7.4
Yijie Wang,Liming Hu,Zhenyu Yin
Different types of soil water, such as bound water and capillary water, have distinct effects on the physicochemical and engineering properties of soils, particularly unsaturated clayey soils. Therefore, it is crucial to develop an accurate and physically meaningful experimental method for identifying and quantifying these components. This study pioneers the use of a multi-step kinetic model to identify and quantify different soil water components across a wide range of relative humidity (RH) using thermogravimetric analysis (TGA) data. To validate the determined kinetic parameters (i.e., activation energy, preexponential factor, and reaction model) and the identification and quantification results of soil water components, TGA with multiple heating rates, nitrogen adsorption method, cation exchange capacity measurement, and nuclear magnetic resonance (NMR) were performed on kaolin samples equilibrated under various RH conditions. These experimental results cross-validate the superior performance of the kinetic model in determining soil water components and predicting the thermal desorption behaviors of soil water. Based on the cross-validation results, the soil water components obtained from the kinetic analysis are further identified as tightly-bound, loosely-bound, and capillary water, which exhibit variations consistent with empirical soil water isotherm models. The T 2 cutoff value between bound and capillary water is determined to be 1.79 ms based on TGA and NMR results. The determined thermal kinetic parameters of different soil water components can exhibit their distinct retention mechanisms. The method and results in this study provide a new perspective on identifying different soil water components, as well as understanding the mechanism of soil-water interactions in unsaturated soils .
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Food Packaging and Shelf Life
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2023
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IF 8
Liping Zhou,Mingda Hao,Tiantian Min,Xiaochun Bian,Haiyu Du,Xiaoli Sun,Zhu Zhu,Yongqiang Wen
This study aimed to develop an antimicrobial food preservation material based on kaolin (KL) encapsulated with thyme essential oil (TEO). The release of TEO in the TEO/KL composite was controlled by the relative humidity inside of food packaging. The morphology and element distribution of TEO/KL composites were determined with scanning electron microscopy and energy dispersive spectrometer. The release profiles illustrated that the release of TEO accelerated with the increase of relative humidity (30%, 60% and 90%) due to the high porosity and hydrophilicity of KL. The antimicrobial results illustrated that the activity of Escherichia coli ( E. coli ), Staphylococcus aureus ( S. aureus ) and Botrytis cinerea ( B. cinerea ) remarkably reduced after treating with the TEO/KL composite (1.0, 1.5 and 2.0 mg), and the inhibition rate reached over 99%. The cytotoxicity assays demonstrated good biocompatibility and biosafety of TEO/KL applied to food preservation. This composite also exhibited a desirable preservation effect on strawberries and grapes and displayed great potential in food industry.
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ENVIRONMENTAL RESEARCH
·
2023
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IF 8.3
Junjun Ma,Tao E,Shuyi Yang,Liang Chen,Ying Cheng,Jia Yu,Yun Li
Stabilizing Cr(III) in tannery sludge (TS) via harmless method has always been the goal of environmental pollution treatment. In this study, a simple method to stabilize Cr(III) in TS is proposed via adding kaolin, based on the fact a large amount of organic matter contained in TS. Comprehensive characterizations confirm that kaolin can stabilize Cr(Ⅲ) via its abundant –OH and lamellar structure. Moreover, there are hydrogen bond interactions and ligand exchange-surface complexation between organic matter and kaolin, which is more conducive to form a stable ternary complex with Cr(III), in a state of organic matter-Cr(III)-kaolin. Simultaneously, the BCR sequential extraction experiment shows that the unstable water and acid soluble state of Cr(III) are reduced (from 0.61% to 0.35%), which further indicates that the stabilization of Cr(III) is successful.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Xue Bai,Juan Shi,Lu Xu,Xin Jin,Xuan Shi,Pengkang Jin
To overcome the shortcomings of homogeneous Fe ion activating peroxymonosulfate (PMS), such as high pH-dependence, limited cycling of Fe(III)/Fe(II) and sludge production, graphite carbon nitride (g-C 3 N 4 ) is chosen as a support for Fe ions, and reduced graphene oxide (rGO) is employed to facilitate the electron transfer process, thereby enhancing catalysis. Herein, a ternary catalyst, Fe-g-C 3 N 4 /rGO, is first applied under lightless condition for PMS activation , which exhibits ideal performance for contaminant mineralization. 82.5 % of the total organic carbon (TOC) in 100 mL of 5 mg/L bis -phenol A (BPA) was removed within 20 min by the optimal catalyst named 30%rFe 0.2 CN, which shows a strong pH adaptability over the range of 3–11 compared with a common Fenton-like system. Moreover, the highly stable Fe-g-C 3 N 4 /rGO/PMS catalytic system resists complex water matrices, especially those with high turbidity . To unveil the mechanism of PMS activation and pollutant degradation , the physicochemical properties of the as-prepared catalysts are comprehensively characterized by multiple techniques. The Fe(III) contained in both the Fe-N group and α-Fe 2 O 3 component of 30%rFe 0.2 CN not only directly reacts with PMS to produce sulfate radicals ( SO 4 − ) and hydroxyl radicals ( OH), but also combines with PMS to form the essential [Fe(III)OOSO 3 ] + active complex, thereby generating superoxide radicals ( O 2 − ) and singlet oxygen ( 1 O 2 ). Among the various reactive oxidizing species, 1 O 2 plays an important role in pollutant removal , which is additionally generated by the C O moiety of the catalyst activating PMS as well as PMS self-oxidation, indicating the dominance of the non-radical pathway in the pollutant degradation process. Due to the advantages of high efficiency, wide pH adaptability and stability, the proposed lightless Fe-g-C 3 N 4 /rGO/PMS catalytic system represents a promising avenue for practical wastewater purification.
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高影响因子
FUEL
·
2022
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IF 8.035
Yuxuan Yang,Zhaoping Zhong,Jiefei Li,Haoran Du,Qian Li,Xiang Zheng,Renzhi Qi,Shan Zhang,Zhaoying Li
Heavy metals produced by coal combustion tend to bring environmental pollution. The modified additives were prepared by kaolin to capture heavy metals from coal combustion and analyzed by XRD, XRF, FT-IR, SEM and BET. The experimental results showed that the retention rates of heavy metals were ranked as Cr > Zn > Pb > Cd. The best retention of heavy metals was achieved at 1000 °C, while the retention capacity gradually decreased from 1000 to 1300 °C. The trapping effect of heavy metals in dynamic experiment is better than static experiment at 1300 °C. The general ranking of the adsorption capacity of the additives for the four heavy metals was pseudo boehmite-metakaolin (PBK) > aluminum sulfate impregnated metakaolin (AlSK) > metakaolin (MKA) > original kaolin (OKA). The PBK was the best adsorbent with the greatest retention rates of 77.35 %, 74.68 %, 83.35 % and 80.41 % for Pb, Cd, Cr and Zn, respectively. In addition, PBK showed the most significant improvement in the trapping of four heavy metals, with an average improvement of 37.79 % compared to no additives. The geometry models of heavy metal compounds and adsorbents were optimized. The heavy metal oxides were more stable than the chlorides and were more easily adsorbed. There is competitive adsorption between oxides and chlorides of heavy metals. The Al-O-Si-H and Al-O-Si are the best adsorption surfaces for OKA and MKA, respectively. However, CdO and CdCl 2 are hardly adsorbed on the Si-O surface of OKA. The frontline orbitals of four heavy metal oxides/chlorides, θ-Al 2 O 3 and α-Al 2 O 3 have been simulated. Computer simulations show that the mechanism of heavy metal oxide/chloride adsorption on additives is a stronger electron transfer induced interaction between the highest occupied molecular orbital of the adsorbate and the lower unoccupied molecular orbital of the adsorbent, which facilitates the formation of stable chemical bonds.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jingwen Yang,Xinyu Zhang,Qimeng Lu,Lei Wang,Xueqin Hu,Hongbin Zhang
Polysaccharides have been widely used in many fields. In the field of food water treatment, polysaccharide-based flocculants have attracted extensive attention. Based on the enzymatic preparation of high molecular weight dextran, two safe, sustainable and eco-friendly dextran based high molecular flocculants were developed by introducing flocculating active groups into the molecular chain of dextran through cross-linking (DEPL) and esterification (Dex-PL). The prepared product was characterized by elemental analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis and field emission scanning electron microscopy (FESEM). Because amino group is the main active group of flocculation, more amino groups are retained in esterification reaction. In the flocculation experiment of kaolin suspension, the efficiency of the two flocculants is very excellent, both of which are greater than 96%. The results of the study on the flocculation mechanism showed that charge neutralization, adsorption bridging and sweeping flocculation mechanisms occurred in the flocculation process. Dex-PL was applied to the clarification of sugarcane juice in sugar industry. At the dosage of 118 mg/L, the clarification efficiency reached 91.4%. The results of biodegradation experiment showed that the product can be biodegraded by enzymatic hydrolysis. This study provides experience for the development and application of new polysaccharide based flocculants, and provides safe and effective flocculants for sugar refining.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Ruoyun Lin,Fangjie Lv,Hao Zhang,Yang Li,Jiangang Lu,Jiansheng Li
Efficient removal of multiple pollutants from discharged antibiotic wastewater effluents by a single processing unit is highly desirable, yet challenging. In this study, intrinsically synergizing Fenton oxidation and in-situ coagulation were achieved in the tannic acid (TA)/Fe(III)/H 2 O 2 process, demonstrating the simultaneous removal of multiple pollutants over a wide pH range. Under the optimal conditions (TA/Fe(III)/H 2 O 2 = 25 mg/L/0.1 mM/0.5 mM), 95.43 % of SMR and 98.41 % of turbidity were simultaneously removed at pH = 7. Moreover, the applicability of this process was validated by treating a spiked actual secondary effluent. Compared with polymer ferric sulphate coagulation and conventional Fe(II)/H 2 O 2 Fenton, TA/Fe(III)/H 2 O 2 process exhibited significantly enhanced removal performance in terms of SMR, COD, UV 254 and turbidity without any pH adjustment. The mechanism analysis revealed that the introduction of TA can not only promote the iron redox cycle for the production of ∙OH, but also neutralize the charge for the generation of the porous flocs. Due to the bridging of TA, the synergy of Fenton oxidation and in-situ coagulation was achieved in a single processing unit. Finally, the synergy mechanism proposed that a four-step process sequentially proceeded during the treatment. This study may provide new insights into the simultaneous removal of multiple pollutants in the advanced treatment of refractory industrial wastewater.
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高影响因子
FUEL
·
2022
·
IF 8.035
Minggao Yu,Fengchuan Wang,Tao He,Haitao Li,Shixin Han,Rongyang Lou,Kai Zheng,Yingying Yu
In this work, with the assistance of the intercalation modification approach, three kinds of intercalated compounds, dimethyl sulfoxide (DMSO), potassium acetate (KAc), and ammonium sulfamate (AS) were successively employed for modification on kaoline to prepare a modified kaolin inhibitor. Then, the TG/DTG test, SEM observation, XRD characterization, and FTIR analysis were respectively utilized to probe the thermal stability, surface structures, and functional groups of the modified kaoline inhibitor. Moreover, the compound inhibitors fabricated by modified kaoline powder blending with ammonium polyphosphate (APP) of different mass fractions were employed to inhibit the explosions of methane/pulverized coal blenders. In the explosion inhibition experiments, the concentrations of methane and coal dust were respectively selected for 9.5 % and 0.105 g/L, while the compound inhibitors with seven various mass fractions of 0.05, 0.075, 0.1, 0.125, 0.15, 0.175, and 0.20 g/L were severally chosen to explore its inhibiting effect on methane/pulverized coal blenders using the 20-L standard spherical explosion apparatus. Results show that both the modified kaoline inhibitor and its compound inhibitor demonstrate a prominent inhibiting effect on methane/pulverized coal blenders. Besides, the inhibiting effect presents the most outstanding as the mass fraction for APP of the compound inhibitor occupies 35 %. Under such a circumstance, the P max of the hybrid mixture decreases from 0.784 to 0.47 MPa and declines by 40.05 % after adding the compound inhibitor, the dP / dt max declines to 3.03 MPa·s −1 while the t P max delays to 1.122 s. Finally, we theoretically analyzed the suppression mechanism of the modified kaoline-containing compound inhibitors on the explosions of methane/pulverized coal blenders based upon the physicochemical properties of the raw samples and the solid particles collected from the post-explosion experiments from the macro and molecular-kinetics perspectives. This preliminary study would contribute to the development of high-efficiency inhibitors for preventing methane/pulverized coal-involved explosion disasters.
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International Journal of Nanomedicine
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2022
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IF 7.033
Yuqi Zhou,Guifang Wang,Tianqi Wang,Jiajia Wang,Xutao Wen,Haishui Sun,Lei Yu,Xiaoying Liu,Juanjuan Zhang,Qin Zhou,Yan Sun
Introduction The nanostructural modification of the oral implant surface can effectively mimic the morphology of natural bone tissue, allowing osteoblasts to achieve both proliferation and differentiation capabilities at the bone interface of the dental implant. To improve the osteoinductive activity on the surface of titanium implants for rapid osseointegration, we prepared a novel composite coating (MAO-PDA-NC) by micro-arc oxidation technique and immersion method and evaluated the proliferation, adhesion, and osteogenic differentiation of osteoblasts on this coating. Methods The coatings were prepared by micro-arc oxidation (MAO) technique and immersion method, and characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM) for different coatings; the loading of PDA was examined using Fourier transform infrared spectroscopy (FTIR); the ion release capacity of the coatings was determined by inductively coupled plasma emission spectrometry (ICP-OES); the interfacial bonding of the coatings was examined using nanoscratch experiment strength. The cytotoxicity of the coating was examined by live/dead staining kit; cell proliferation viability was examined by CCK-8 kit; adhesion and osteogenic effect of the coating were examined by immunofluorescence staining and RT-PCR; osteogenic differentiation was examined by alkaline phosphatase staining. Results The surface morphology of titanium implants was modified by micro-arc oxidation technology, and a new MAO-PDA-NC composite coating was successfully prepared. The results showed that the MAO-PDA-NC coating not only optimized the physical and chemical properties of the titanium implant surface but also significantly stimulated the biological properties of osteoblast adhesion, proliferation, and osteogenic differentiation on the coating surface. Conclusion These results show that MAO-PDA-NC composite coating can significantly improve the surface properties of titanium implants and achieve a stable bond between implant and bone tissue, thus accelerating early osseointegration.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 7
·18285-18295
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IF 5.19
Xu Xia,Guo Jun,Yang Ruoying,Gao Yu,Xue Yingang,Wang Liping,Zhang Ling,Zhang Qiuya,Peng Mingguo,Liu Xuefeng
Titanium xerogel coagulant (TXC) is a new type of coagulant that has attracted much attention in recent years. However, the tetracycline removal performance of TXC was not satisfactory because low isoelectric point (pH iep ) inhibited the electrical neutralization efficiency of TXC in an alkaline environment. To overcome this shortcoming, a composite xerogel coagulant (titanium-aluminum xerogel composite coagulant) was prepared. The removal of tetracycline and turbidity was used as evaluation indexes. It was proved that the combination of aluminum (III) and titanium (IV) enhanced the resistance of TXC to pH. The synthesized titanium-aluminum xerogel composite coagulant (TXAC) has an excellent removal ability of tetracycline in a wide pH range (pH = 5–10). At pH 8.8, the dosage required to remove 80% tetracycline from water decreased from 93 (TXC) to 35 mg/L (TXAC). The reason for this improvement could be attributed to (i) aluminum (III) enhanced the electric neutralization of TXC to negatively charged pollutants in an alkaline environment; (ii) the complexing ability of organic matter and aluminum (III) was enhanced. This work provides a feasible scheme for the pretreatment of tetracycline in water to meet the pretreatment requirements of special water.
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危险品化学品经营许可证（带存储）