Preparation of Powdered Activated Carbon Matrix Composites and Their Decontamination Performance and Mechanisms for Oily Sewage

doi:10.6023/A22080375

Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (12): 1592-1599.DOI: 10.6023/A22080375 Previous Articles Next Articles

Article

粉末活性炭基复合材料制备及净化含油污水的性能和机制

宋亚瑞^a^,^b, 王凯升^b, 安广宇^c, 赵法军^a^,^*(), 门彬^c, 杜昭兮^b, 王东升^d

^a东北石油大学提高油气采收率教育部重点实验室黑龙江大庆 163318
^b东北石油大学防灾减灾及防护工程重点实验室黑龙江大庆 163318
^c中国科学院生态环境研究中心环境水质学国家重点实验室北京 100085
^d浙江大学环境与资源学院浙江杭州 310058

投稿日期:2022-08-27 发布日期:2022-11-08
通讯作者: 赵法军

Preparation of Powdered Activated Carbon Matrix Composites and Their Decontamination Performance and Mechanisms for Oily Sewage

Yarui Song^a^,^b, Kaisheng Wang^b, Guangyu An^c, Fajun Zhao^a(), Bin Men^c, Zhaoxi Du^b, Dongsheng Wang^d

^aKey Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
^bKey Laboratory of Disaster Prevention, Mitigation and Protection Engineering, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
^cState Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
^dCollege of Environmental & Resource Sciences of Zhejiang University, Hangzhou 310058, Zhejiang, China

Received:2022-08-27 Published:2022-11-08
Contact: Fajun Zhao

In order to solve the problems of low adsorption efficiency and slow precipitation rate for powdered activated carbon (PAC) in the process of removing hydrophilic organics with low molecular weight, this study successfully prepare a kind of powdered activated carbon matrix composites (PACMC) by reaction of mixed powdered activated carbon (PAC), potassium humate (HS), and polyaluminium chloride (PACl) raw materials in oily sewage as the purification adsorbent. We confirmed the micro-morphology and chemical composition of PACMC by scanning electron microscopy-X-ray energy dispersive spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy (FT-IR), certifying that PACMC was synthesized by chemical reaction of PAC, HS and PACl. PACMC has layered porous structure and functional groups, which is beneficial to the transport, diffusion and chemical adsorption of oily sewage molecules. The static adsorption experiments were carried out to investigate the adsorption properties of organic pollutants in oily sewage by PACl, PAC and PACMC respectively. The results showed that the adsorption capacity of PACMC for organic pollutants in oily sewage was 2~3 times as high as that of PAC and PACl (q_e=23.04 mg•g^‒1, C₀=300 mg•L^‒1). When the adsorption time reached 120 min, the binding of the active site on PACMC and organic pollutants in oily sewage had basically reached saturation (q_e=23.04 mg•g^‒1, C₀=300 mg•L^‒1). The pH value of the solution has a significant effect on the adsorption of organic pollutants in oily sewage by PACMC, and the best adsorption effect was observed at pH=3 (q_e=27.6 mg•g^‒1, C₀=300 mg•L^‒1). The adsorption of organic pollutants in oily sewage by PACMC can be well described by the pseudo-second-order kinetics. The kinetic fitting results revealed that the adsorption process involved several steps, where the chemical adsorption and intra-particle diffusion both played the important roles. The isothermal adsorption data were in accordance with the Dubinin-Radushkevich model, which indicated that the adsorption mechanism was chemical adsorption. Therefore, the mechanism of PACMC adsorption of oily sewage included chemical binding/chelation effect, hydrophobic effect and electrostatic adsorption effect.

Key words: powdered activated carbon, adsorption, oily sewage, powdered activated carbon matrix composites

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Yarui Song, Kaisheng Wang, Guangyu An, Fajun Zhao, Bin Men, Zhaoxi Du, Dongsheng Wang. Preparation of Powdered Activated Carbon Matrix Composites and Their Decontamination Performance and Mechanisms for Oily Sewage[J]. Acta Chimica Sinica, 2022, 80(12): 1592-1599.

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Fig. & Tab. 9

Figure 1. Infrared spectra of composite material and ingredient

Figure 2. (a) Preparation route of PACMC; (b) schematic microstructure for PACMC

Figure 3. SEM and EDS maps of PACMC and PAC. (a) PACMC-SEM; (b) PAC-SEM; (c) PACMC-EDS; (d) PAC-EDS

Figure 4. EEMs maps of supernatant of PACMC blank adsorption experiment at different pH conditions

Figure 5. (a) Particle size distribution of PACMC; (b) zero potential of PACMC at different pH

Figure 6. (a) Influence of adsorbent dosage for TOC removal efficiency of oily sewage on PACMC, PAC and PACl; (b) influence of reaction time for TOC removal efficiency of oily sewage on PACMC; (c) influence of solution pH for TOC removal efficiency of oily sewage on PACMC

Figure 7. (a) Kinetics of oily sewage adsorption on PACMC; (b) particle diffusion model for oily sewage adsorption on PACMC; (c, d) fitting of adsorption isotherms of PACMC

Figure 8. The relationship between ln Kb and reciprocal temperature of determining thermodynamic parameters

Figure 9. SEM and EDS maps of PACMC and PAC after adsorption. (a) SEM of PACMC after adsorption; (b) SEM of PAC after adsorption; (c) EDS of PACMC after adsorption; (d) EDS of PAC after adsorption

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粉末活性炭基复合材料制备及净化含油污水的性能和机制

Preparation of Powdered Activated Carbon Matrix Composites and Their Decontamination Performance and Mechanisms for Oily Sewage

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