SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
Gongduan Fan,Chongguo Chen,Xiaolei Chen,Zhongsheng Li,Shulei Bao,Jing Luo,Dingsheng Tang,Zhongsen Yan
Ultrafiltration is an environmentally friendly water treatment technology, but membrane fouling significantly impacts membrane performance and service life. Photocatalytic modification of membrane is regarded as an effective way for membrane fouling control. In this study, graphite oxide (GO), Ag 3 PO 4 and Ag 3 PO 4 -GO nanomaterials were applied in polyvinylidene fluoride (PVDF) ultrafiltration membranes modification, and the membranes was denoted as P-GO, P-AgP and P-AgP@GO, respectively. Filtration of humic acid (HA) at different operating conditions was adopted in evaluation of membrane performance. Among them, P-AgP@GO had the best permeation, rejection and antifouling performances, and could maintain excellent properties when operation conditions (HA concentration, operation pressure, pH and ionic strength) were changed. Furthermore, the effect of photocatalysis on the self-cleaning performance and its mechanism were revealed. The overall performance of P-AgP@GO could be enhanced by visible light irradiation, and extending the visible illumination time during the filtration was conducive to the reusability.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Catalysis Science & Technology
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2017
·Vol. 8
·期 2
·632-641
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IF 5.773
Xuli Miao,Xiaoyang Yue,Xiaoping Shen,Zhenyuan Ji,Hu Zhou,Guoxing Zhu,Jiheng Wang,Lirong Kong,Miaomiao Liu,Chunsen Song
In this paper, an all solid Z-scheme Ag3PO4/GO/NCD photocatalyst has been prepared through anchoring nitrogen-doped carbon dots (NCDs) on the Ag3PO4/GO (GO = graphene oxide) composite. The Ag3PO4/GO/NCD photocatalyst exhibits excellent photocatalytic activity for the degradation of organic pollutants, methylene blue (MB), rhodamine B (RhB) and phenol, under visible-light irradiation. The pollutants MB (10 mg L−1), RhB (10 mg L−1) and phenol (50 mg L−1) could be efficiently degraded within 2.5 min, 5 min and 120 min, respectively, which are much better than that over Ag3PO4 and Ag3PO4/GO, indicating that the introduction of NCDs can further improve the photocatalytic activity of Ag3PO4/GO. Moreover, after four photocatalytic cycles, the photocatalytic activity of Ag3PO4/GO/NCDs shows only a slight decrease, demonstrating high photocatalytic stability. It is revealed that GO in the photocatalyst acts as a semiconductor and forms a Z-scheme heterojunction with Ag3PO4, while NCDs improve the oxygen activation, enhance the light harvesting capacity and serve as the reaction sites during the photocatalytic process. This study highlights the potential application of highly efficient NCD-modified photocatalysts in waste water purification.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Rui Zhang,Yu Li,Youfeng Cai,Qiong Han,Tongqing Zhang,Yi Liu,Kunling Zeng,Chen Zhao
Silver-phosphate/graphene oxide/APTES (Ag 3 PO 4 /GO/APTES) composite materials modified by 3-aminopropyltriethoxysilane (APTES) were incorporated into polyvinylidene fluoride (PVDF) membrane to obtain light catalytic membrane. The structure and morphology of Ag 3 PO 4 /GO/APTES were characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and thermogravimetric analyzer (TGA). Next, the morphology structure and roughness of Ag 3 PO 4 /GO/APTES/PVDF membrane were studied using SEM and Atomic force microscopy (AFM). The hydrophilicity and water flux of blended membranes were enhanced by the presence of a large number of hydrophilic groups on the surfaces of GO and APTES. Using Bovine serum albumin (BSA) solution as a pollution model, the multi-cycle anti-organic pollution ability of composite membranes was explored, and the anti-pollution performance was improved. The results showed that with the increase of Ag 3 PO 4 /GO/APTES content in the composite membrane, the rejection rate of dyes increases significantly. The enhanced photocatalytic degradation can be attributed to the presence of RGO which facilitates electron mediation and shuttle. This work provide a method for the efficient removal of dyes from wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Environmental Science and Ecotechnology
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2021
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IF 0
Guanhan Chen,Wenyi Dong,Hongjie Wang,Zilong Zhao,Feng Wang,Feifei Wang,Cesar Nieto-Delgado
Carbamazepine (CBZ), as one of the most frequently detected pharmaceuticals, is of great concern due to its potential impact on the ecosystem and human health. This study provides an effective approach to remove CBZ by using photocatalyst silver phosphate combined with graphene oxide (Ag 3 PO 4 /GO) under visible irradiation. The morphology, composition, and optical properties of Ag 3 PO 4 /GO were characterized employing SEM, XRD, and DRS. Graphene oxide could improve the visible-light utilization and promote electron's charge to enhance the photocatalytic performance of Ag 3 PO 4 /GO. With the optimal reaction condition of 5.86 mW/cm 2 light intensity, 15–25 °C temperature, 5–7 pH, and 0.5 mg/L catalytic dosages, 5 mg/L CBZ could be completely degraded in 30 min, and the apparent rate constant could reach 0.12 min −1 . Additionally, the radical trapping experiments indicated •OH and O 2 ˉ• were the main reactive oxygen species employed to eliminate CBZ. The decay pathways of CBZ had been proposed accordingly, and the main product was the low-molecular products.
研究领域:
环境科学
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药学
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材料科学
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产品关联
DOI
PubMed
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