Asif Jan, Mingliang Chen, Michiel Nijboer, Mieke W J Luiten-Olieman, Luuk C Rietveld, Sebastiaan G J Heijman
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引用次数: 0
摘要
次氯酸钠(NaClO)被广泛用于污垢超滤膜的化学清洗。对聚合物膜进行的各种研究表明,长期(大于 100 小时)接触 NaClO 会恶化膜的物理化学特性,导致性能和使用寿命降低。然而,NaClO 清洁对陶瓷膜的影响,特别是陶瓷膜为减轻不可逆污垢而可进行的清洁循环次数,仍然鲜为人知。碳化硅(SiC)膜在水和废水处理方面受到广泛关注,但其在 NaClO 中的化学稳定性尚未得到研究。低压化学气相沉积(LP-CVD)为制备/改性陶瓷膜提供了一条简单而经济的途径。因此,低压化学气相沉积法有利于制备碳化硅膜:(a) 一步到位;(b) 与溶胶凝胶法(约 2000 ℃)相比,温度更低(700-900 ℃)。在这项工作中,通过 LP-CVD 在两种不同的沉积温度和压力下制备了 SiC 超滤膜。随后,对其在 NaClO 中 200 小时的老化过程中的化学稳定性进行了研究。随后,对老化前后制备的碳化硅超滤膜的特性和性能进行了评估,以确定最佳沉积条件。我们的结果表明,在 860 °C 和 100 mTorr 下通过 LP-CVD 制备的 SiC 超滤膜对 NaClO 老化具有极佳的耐受性,而在 750 °C 和 600 mTorr 下制备的膜则明显变差。这些发现不仅强调了通过 LP-CVD 一步法制备 SiC 膜的新路线,而且为仔细选择 SiC 膜的 LP-CVD 条件以确保其在苛刻的化学清洗条件下的长期性能和稳健性提供了新的见解。
Effect of Long-Term Sodium Hypochlorite Cleaning on Silicon Carbide Ultrafiltration Membranes Prepared via Low-Pressure Chemical Vapor Deposition.
Sodium hypochlorite (NaClO) is widely used for the chemical cleaning of fouled ultrafiltration (UF) membranes. Various studies performed on polymeric membranes demonstrate that long-term (>100 h) exposure to NaClO deteriorates the physicochemical properties of the membranes, leading to reduced performance and service life. However, the effect of NaClO cleaning on ceramic membranes, particularly the number of cleaning cycles they can undergo to alleviate irreversible fouling, remains poorly understood. Silicon carbide (SiC) membranes have garnered widespread attention for water and wastewater treatment, but their chemical stability in NaClO has not been studied. Low-pressure chemical vapor deposition (LP-CVD) provides a simple and economical route to prepare/modify ceramic membranes. As such, LP-CVD facilitates the preparation of SiC membranes: (a) in a single step; and (b) at much lower temperatures (700-900 °C) in comparison with sol-gel methods (ca. 2000 °C). In this work, SiC ultrafiltration (UF) membranes were prepared via LP-CVD at two different deposition temperatures and pressures. Subsequently, their chemical stability in NaClO was investigated over 200 h of aging. Afterward, the properties and performance of as-prepared SiC UF membranes were evaluated before and after aging to determine the optimal deposition conditions. Our results indicate that the SiC UF membrane prepared via LP-CVD at 860 °C and 100 mTorr exhibited excellent resistance to NaClO aging, while the membrane prepared at 750 °C and 600 mTorr significantly deteriorated. These findings not only highlight a novel preparation route for SiC membranes in a single step via LP-CVD, but also provide new insights about the careful selection of LP-CVD conditions for SiC membranes to ensure their long-term performance and robustness under harsh chemical cleaning conditions.
MembranesChemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍:
Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.