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  • 1
    In: Journal of Chemistry, Hindawi Limited, Vol. 2017 ( 2017), p. 1-10
    Abstract: Removal of copper ion (Cu 2+ ) by using surfactant modified laterite (SML) was investigated in the present study. Characterizations of laterite were examined by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), inductively coupled plasma mass spectrometry (ICP-MS), and total carbon analysis. The optimum conditions for removal of Cu 2+ by adsorption using SML were systematically studied and found as pH 6, contact time 90 min, adsorbent dosage 5 mg/mL, and ionic strength 10 mM NaCl. The equilibrium concentration of copper ions was measured by flame atomic absorption spectrometry (F-AAS). Surface modification of laterite by anionic surfactant sodium dodecyl sulfate (SDS) induced a significant increase of the removal efficiency of Cu 2+ . The surface modifications of laterite by preadsorption of SDS and sequential adsorption of Cu 2+ were also evaluated by XRD and FT-IR. The adsorption of Cu 2+ onto SML increases with increasing NaCl concentration from 1 to 10 mM, but at high salt concentration this trend is reversed because desorption of SDS from laterite surface was enhanced by increasing salt concentration. Experimental results of Cu 2+ /SML adsorption isotherms at different ionic strengths can be represented well by a two-step adsorption model. Based on adsorption isotherms, surface charge effects, and surface modification, we suggest that the adsorption mechanism of Cu 2+ onto SML was induced by electrostatic attraction between Cu 2+ and the negatively charged SML surface and nonelectrostatic interactions between Cu 2+ and organic substances in the laterite.
    Type of Medium: Online Resource
    ISSN: 2090-9063 , 2090-9071
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2017
    detail.hit.zdb_id: 2393625-3
    detail.hit.zdb_id: 2703077-5
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  • 2
    Online Resource
    Online Resource
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2023
    In:  Communications in Physics Vol. 33, No. 1 ( 2023-02-21), p. 103-
    In: Communications in Physics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 33, No. 1 ( 2023-02-21), p. 103-
    Abstract: Enhanced gas sensing properties of hematite \(\alpha\)-Fe2O3 by loaded reduced graphene oxides (RGO) have attracted considerable attention. In this study, RGO-loaded \(\alpha\)-Fe2O3 nanofibers were fabricated via the facile electrospinning method and subsequent calcination process. The scanning electron microscopy (SEM) images showed that RGO-loaded \(\alpha\)-Fe2O3 nanofibers with diameters of 50-100 nm have typical morphologies of spider nets. The X-ray diffraction (XRD) patterns revealed the rhombohedral structure of the RGO-loaded α-Fe2O3 nanofibers. The energy dispersive X-ray spectroscopy (EDS) results exhibited the presence of Fe, O, and C elements in the synthesized nanofibers. The gas sensing results also confirmed that the sensors based on RGO-loaded \(\alpha\)-Fe2O3 nanofibers could be applied for detecting ethanol gas.
    Type of Medium: Online Resource
    ISSN: 2815-5947 , 0868-3166
    URL: Issue
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2023
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  • 3
    In: Science and Technology Development Journal, Viet Nam National University Ho Chi Minh City, Vol. 20, No. K8 ( 2019-04-13), p. 42-49
    Abstract: Industrial sludge is a by-product which is enormously generated in wastewater treatment plants. Constructed wetland for sludge treatment (CWST) is a low cost, effective technology. This study investigated the effect of various design and operation parameters on the efficiency of four pilot-scale CWSTs to determine the optimal parameters by using the Analytic Hierarchy Process (AHP) for Decision- Making. The wetland units were planted with Phragmites australis or Typha angustifolia, operated with four sludge loading rate (SLR) (50, 60, 70 and 80 L/m2) and monitored in six different hydraulic retention time (HRT) (2,5,7,9,12 and 14 days). AHP results provided the optimal key parameters (vegetation of P. australis, 14-day HRT, SLR of 60 L/m2) which gave the most effective sludge treatment, reducing 99.8%, 95.16% and 98.23% for COD, TKN and TP, respectively. The results also showed that HRT, SLR and vegetation remarkably affected to the efficiency of CWST. In addition, AHP is an effective method to determine the optimal design and operation parameters of CWST.  
    Type of Medium: Online Resource
    ISSN: 1859-0128 , 1859-0128
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2019
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  • 4
    Online Resource
    Online Resource
    Elsevier BV ; 2021
    In:  Journal of Science: Advanced Materials and Devices Vol. 6, No. 1 ( 2021-03), p. 11-18
    In: Journal of Science: Advanced Materials and Devices, Elsevier BV, Vol. 6, No. 1 ( 2021-03), p. 11-18
    Type of Medium: Online Resource
    ISSN: 2468-2179
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2856527-7
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  • 5
    In: International Journal of Polymer Science, Hindawi Limited, Vol. 2018 ( 2018-12-13), p. 1-11
    Abstract: We investigated adsorption of anionic surfactants, sodium dodecyl sulfate (SDS) and sodium tetradecyl sulfate (STS), onto alumina (Al 2 O 3 ) with large size in the present study. The effective conditions for SDS and STS adsorption onto Al 2 O 3 were systematically studied. The conditions for SDS and STS adsorption onto γ -Al 2 O 3 were optimized and found to be contact time 180 min, pH 4, and 1 mM NaCl. Adsorption of both SDS and STS onto large Al 2 O 3 beads increased with an increase of ionic strength, demonstrating that the adsorption is controlled by electrostatic attraction between anionic sulfate groups and positively charged Al 2 O 3 surface, as well as hydrophobic interactions between long alkyl chains of surfactant molecules. Nevertheless, the hydrophobic interaction in terms of STS adsorption is much higher than that of SDS adsorption. The obtained SDS and STS adsorption isotherms in different NaCl concentrations onto Al 2 O 3 beads were fitted well by two-step adsorption. Adsorption mechanisms were disused in detail on the basis of adsorption isotherm, the change in surface charge, and the change in functional surface groups by Fourier-transform infrared spectroscopy (FTIR). The application of surfactant adsorption onto Al 2 O 3 to remove cadmium ion (Cd 2+ ) was also studied. The optimum conditions for Cd 2+ removal using surfactant-modified alumina (SMA) are pH 6, contact time 120 min, and ionic strength 0.1 mM NaCl. Under optimum conditions, the removal efficiency of Cd 2+ using SMA increased significantly. We demonstrate that SMA is a novel adsorbent for removal of Cd 2+ from aqueous solution.
    Type of Medium: Online Resource
    ISSN: 1687-9422 , 1687-9430
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2018
    detail.hit.zdb_id: 2520688-6
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  • 6
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2017
    In:  Microsystem Technologies Vol. 23, No. 1 ( 2017-1), p. 101-111
    In: Microsystem Technologies, Springer Science and Business Media LLC, Vol. 23, No. 1 ( 2017-1), p. 101-111
    Type of Medium: Online Resource
    ISSN: 0946-7076 , 1432-1858
    RVK:
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2017
    detail.hit.zdb_id: 1476561-5
    detail.hit.zdb_id: 1223008-X
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  • 7
    Online Resource
    Online Resource
    IOP Publishing ; 2024
    In:  Advances in Natural Sciences: Nanoscience and Nanotechnology Vol. 15, No. 1 ( 2024-03-01), p. 015017-
    In: Advances in Natural Sciences: Nanoscience and Nanotechnology, IOP Publishing, Vol. 15, No. 1 ( 2024-03-01), p. 015017-
    Abstract: In this study, we use the chemical vapour deposition trapping method to grow various one-dimensional (1D) indium oxide (In 2 O 3 ) nanostructures, namely nanorods (NRs), nanoneedles (NNs), and nanowires (NWs). The structural and morphological characteristics of the synthesised nanostructures are analysed using x-ray diffraction and scanning electron microscopy. By comparing the morphology of In 2 O 3 under different growth conditions with previous research findings, we investigate the growth mechanism and the role of gold catalysts. The In 2 O 3 sensor presented a good selection for C 2 H 5 OH gas. The NWs-based sensor exhibits a superior response and faster response-recovery rates (50%, and 49 s/343 s) in comparison to the NRs- (45%, and 35 s/339 s) and NNs-based sensors (8%, and 70 s/496 s) when exposed to 200 ppm C 2 H 5 OH at 400 °C. Besides, the sensors exhibited good stability under the switch-off reversible cycle. The linear discriminant analysis (LDA) model was effectively used in classifying target gases such as 25–200 ppm C 2 H 5 OH, NH 3 , and CO at the temperature of 350 °C–450 °C. We attribute the NWs-based sensor’s better gas-sensing performance to its favourable morphology for gas diffusion and modulation of depletion depth.
    Type of Medium: Online Resource
    ISSN: 2043-6262
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2024
    detail.hit.zdb_id: 2563789-7
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  • 8
    Online Resource
    Online Resource
    Ovid Technologies (Wolters Kluwer Health) ; 2021
    In:  Optometry and Vision Science Vol. 98, No. 1 ( 2021-1), p. 24-31
    In: Optometry and Vision Science, Ovid Technologies (Wolters Kluwer Health), Vol. 98, No. 1 ( 2021-1), p. 24-31
    Abstract: Quality refractive error care is essential for reducing vision impairment. Quality indicators and standardized approaches for assessing the quality of refractive error care need to be established. PURPOSE This study aimed to develop a set of indicators for assessing the quality of refractive error care and test their applicability in a real-world setting using unannounced standardized patients (USPs). METHODS Patient outcomes and three quality of refractive error care (Q.REC) indicators (1, optimally prescribed spectacles; 2, adequately prescribed spectacles; 3, vector dioptric distance) were developed using existing literature, refraction training standards, and consulting educators. Twenty-one USPs with various refractive errors were trained to visit optical stores across Vietnam to have a refraction, observe techniques, and order spectacles. Spectacles were assessed against each Q.REC indicator and tested for associations with vision and comfort. RESULTS Overall, 44.1% (184/417) of spectacles provided good vision and comfort. Of the spectacles that met Q.REC indicators 1 and 2, 62.5 and 54.9%, respectively, provided both good vision and comfort. Optimally prescribed spectacles (indicator 1) were significantly more likely to provide good vision and comfort independently compared with spectacles that did not meet any indicator (good vision: 94.6 vs. 85.0%, P = .01; comfortable: 66.1 vs. 36.3%, P 〈 .01). Adequately prescribed spectacles (indicator 2) were more likely to provide good comfort compared with spectacles not meeting any indicator (57.7 vs. 36.3%, P 〈 .01); however, vision outcomes were not significantly different (85.9 vs. 85.0%, P = .90). Good vision was associated with a lower mean vector dioptric distance ( P 〈 .01) but not with comfort ( P = .52). CONCLUSIONS The optimally prescribed spectacles indicator is a promising approach for assessing the quality of refractive error care without additional assessments of vision and comfort. Using USPs is a practical approach and could be used as a standardized method for evaluating the quality of refractive error care.
    Type of Medium: Online Resource
    ISSN: 1538-9235 , 1040-5488
    Language: English
    Publisher: Ovid Technologies (Wolters Kluwer Health)
    Publication Date: 2021
    detail.hit.zdb_id: 2083924-8
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  • 9
    Online Resource
    Online Resource
    Industrial University of Ho Chi Minh City (IUH) ; 2022
    In:  Journal of Science and Technology - IUH Vol. 53, No. 05 ( 2022-03-10)
    In: Journal of Science and Technology - IUH, Industrial University of Ho Chi Minh City (IUH), Vol. 53, No. 05 ( 2022-03-10)
    Abstract: Nghiên cứu này xây dựng khung đánh giá sự quản lý an toàn lao động (ATLĐ) trên các công trường xây dựng tại thành phồ Hồ Chí Minh. Từ tổng quan nghiên cứu trước đây và ý kiến chuyên gia, nghiên cứu xác định được 16 yếu tố ảnh hưởng đến sự quản lý ATLĐ trên các công trường xây dựng. Dựa trên kết quả xếp hạng yếu tố và phân tích nhân tố khám phá, một khung đánh giá sự quản lý ATLĐ được hoàn thiện bao gồm 14 yếu tố và 4 nhóm nhân tố chính là (1) các quy định và chính sách về ATLĐ, (2) kiến thức và thái độ đối với ATLĐ, (3) lập kế hoạch thực hiện ATLĐ, (4) kiểm tra, giám sát thực hiện ATLĐ trên công trường. Khung đánh giá hy vọng giúp các nhà thầu cải thiện sự quản lý ATLĐ trên công trường.
    Type of Medium: Online Resource
    ISSN: 2525-2267 , 2525-2267
    Language: Unknown
    Publisher: Industrial University of Ho Chi Minh City (IUH)
    Publication Date: 2022
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  • 10
    Online Resource
    Online Resource
    Springer Science and Business Media LLC ; 2022
    In:  Korea-Australia Rheology Journal Vol. 34, No. 4 ( 2022-11), p. 335-347
    In: Korea-Australia Rheology Journal, Springer Science and Business Media LLC, Vol. 34, No. 4 ( 2022-11), p. 335-347
    Type of Medium: Online Resource
    ISSN: 1226-119X , 2093-7660
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2180153-8
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