Preparation of magnetic carbon nanotube nanocomposite for enhancing the separation of dissolved hydrocarbon from petroleum wastewater (original) (raw)
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Multiwalled carbon nanotubes and their magnetite derivatives were employed as adsorbents for emulsified oil removal from produced water. The experimental parameters for maximum emulsified oil removal efficiency and effective regeneration of these adsorbents were determined. The optimum parameters in terms of adsorbent dosage, contact time, salinity, pH and temperature were 3.0 g/L, 20.0 min, 0 ppm, 7.0 and 25 o C for both adsorbents. Due to their low density, multiwalledcarbon nanotubes could not be successfully employed in packed bed columns. The magnetite derivative has a larger density and hence, for the removal of emulsified oil from produced water packed bed column studies were performed utilizing multiwalled carbon magnetite nanotubes. The packed bed column efficiency and behavior were evaluated using Thomas, Clark, Yan et al. and Bohart and Adams models. The Yan model was found to best describe the column experimental data. The adsorbents were regenerated using n-hexane and reused several times for oil removal from produced water without any significant decrease in their initial adsorption capacities.
2010
Novos compósitos magnéticos anfifílicos foram preparados pelo crescimento de nanotubos e nanofibras de carbono contendo partículas magnéticas através de deposição química de vapor (CVD), utilizando etanol como fonte de carbono e lama vermelha (RM, subproduto do processo Bayer de produção de alumina) como suporte e catalisador. Monitoramento da reação CVD à temperatura programada (TPCVD), difração de raios X (XRD), espectroscopia Mössbauer, espectroscopia de energia dispersiva (EDS), espectroscopia Raman, termogravimetria (TG/DTA), análise elementar (CHN), determinação de área superficial (BET), microscopia eletrônica de varredura (SEM) e de transmissão (TEM) e medidas magnéticas mostraram que etanol reduz íons de ferro na RM para formar fases magnéticas, por exemplo Fe 3 O 4 e Fe 0 , e depósitos de carbono (5-42 wt.%) na forma de nanotubos e nanofibras. A combinação de nanoestruturas hidrofóbicas de carbono com óxidos hidrofílicos de Al, Si e Ti presentes na lama vermelha produziu materiais anfifílicos com excelente interação com a interface água-óleo. Misturas de óleo de soja ou de decalina com água (completamente imiscíveis) foram emulsificadas facilmente na presença dos compósitos anfifílicos. Quando os compósitos foram adicionados a uma emulsão água-biodiesel estável, as partículas anfifílicas difundiram-se para a interface água-óleo. As partículas do compósito foram atraídas por ímãs e carregaram com elas as gotas de óleo, levando à completa desemulsificação e separação entre biodiesel e água.
Arabian Journal for Science and Engineering, 2020
Nanomaterials were used in enhanced oil recovery methods to improve the surface activity at the solid/oil/liquid contact line and remove oil through disjoining pressure gradient mechanism. The main objective of study is to prepare a green nanocomposites (NCs) and identify its effect on the interfacial tension (IFT) reduction and wettability alteration. A simple, economical and green technique was applied to synthesize Fe 3 O 4 @SiO 2 @xanthan NCs from the Alocasia macrorrhiza plant extract. The prepared NCs were identified employing X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. The fabricated NCs at different concentrations (250 to 1500 ppm) were dispersed in distilled water to prepare the nanofluid solutions which were characterized by analyzing their viscosity, pH and conductivity properties. Additionally, the effect of the prepared nanofluids on the IFT reduction and wettability alteration of the crude-oil/aqueous-phase/rock system was examined. Obtained experimental results demonstrated a significant decrease in the values of IFT and contact angle under the effect of the synthesized NCs, which were reduced from 28.3 mN/m and 134° to 4.35 mN/m and 28°, respectively. Thus, the wettability of the used carbonate rock was greatly altered from a strong oil-wet to a strong water-wet system.
Electromagnetic waves-induced hydrophobic multiwalled carbon nanotubes for enhanced oil recovery
Journal of Petroleum Exploration and Production Technology
Extracting the trapped oil into the pores is still a massive challenging. In this work, multiwalled carbon nanotubes were utilized to investigate the influence of the nanofluid's flow rate on the oil recovery in enhanced oil recovery (EOR) stage. At the optimum conditions, comparative study was conducted to figure out the impact of EM waves on the recovery efficiency. The experimental study proved that 2 mL/min is the optimum flow rate for the utilized fluid. EM waves could enhance the recovered oil in EOR stage by 24.5% ROIP. The increment was ascribed to the extraordinary role of EM waves in increasing the viscosity of the nanofluid.