Economical Synthesis of High Surface Area γ-Al2O3 for the Adsorption of Organic Pollutant from Wastewater
Jinjin Li,
Hao Wang,
Ronghai Zhu,
Honggang Chang,
Gang Xiong,
Jingxian Wu,
Hao Feng,
Ping Li
Issue:
Volume 8, Issue 4, July 2020
Pages:
76-89
Received:
25 July 2020
Accepted:
8 August 2020
Published:
25 August 2020
Abstract: A series of γ-Al2O3 with high surface area applied for removal of Congo red (CR) from aqueous solution was prepared from cheap inorganic aluminum precursor using simple precipitation method in presence of an inexpensive anionic surfactant (sodium dodecyl sulfate, SDS). The material characterization by several techniques revealed that SDS plays an important role on the morphology and textural properties of the resultant γ-Al2O3, and the largest surface area of γ-Al2O3 (416.65 m2/g) was obtained by varying molar ratio of SDS to aluminum precursor to be 0.375. The CR adsorption experiments identified that the adsorption isotherms on the as-synthesized γ-Al2O3 obey the Langmuir model. The maximum CR adsorption capacity of 831.7 mg/g was provided on the γ-Al2O3 having the largest surface area, verifying the importance of material surface area for achieving superior adsorption performance. The CR adsorption behaviors onto various γ-Al2O3 materials were analyzed using different kinetic models, and the results suggest a multistep adsorption mechanism. Besides, the equilibrium adsorption data well fitted the pseudo-second-order kinetic model, manifesting that the chemical adsorption process is the rate-limiting step. Moreover, the γ-Al2O3 synthesized showed good recyclability for CR removal, and thus could be a very effective and cost-saving adsorbent for the treatment of industrial wastewater containing organic pollutants.
Abstract: A series of γ-Al2O3 with high surface area applied for removal of Congo red (CR) from aqueous solution was prepared from cheap inorganic aluminum precursor using simple precipitation method in presence of an inexpensive anionic surfactant (sodium dodecyl sulfate, SDS). The material characterization by several techniques revealed that SDS plays an i...
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Technical Transformation and Innovation on Refinery Acid Gas Dry Process Acid Plant
Issue:
Volume 8, Issue 4, July 2020
Pages:
90-95
Received:
18 August 2020
Accepted:
31 August 2020
Published:
21 September 2020
Abstract: This article introduces a new and efficient process and device for acid gas recovery in refining and chemical enterprises-hydrogen sulfide dry acid production process and device. The main problems and failures in the operation of the device are explained, and the related problems and the causes of the failures are analyzed in a targeted manner. In the technical transformation of the base and lining of the acid gas incinerator and the adaptive transformation of the electric defogging system, the development and application of new all-glass steel cooling tower, the implementation of new technologies to improve the efficiency of defogging and acid separation, and the mass transfer and heat transfer efficiency of the process medium, The application of "three units" technology to improve the technical and economic level of the device, the use of sodium-alkali neutralization process to treat the wastewater and tail gas of the device, have unique insights and successful experience, and continue to carry out technical improvement, innovation, integration and application of results for the device. The safety, stability, long-term, economic operation and design and improvement of related fields have important guidance and reference significance.
Abstract: This article introduces a new and efficient process and device for acid gas recovery in refining and chemical enterprises-hydrogen sulfide dry acid production process and device. The main problems and failures in the operation of the device are explained, and the related problems and the causes of the failures are analyzed in a targeted manner. In ...
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Preparation of NixO-FexO/Ceramsite Catalyst and Its Application in Advanced Treatment of Pharmaceutical Wastewater
Wenling Yang,
Tan Wang,
Jiu Wu
Issue:
Volume 8, Issue 4, July 2020
Pages:
96-102
Received:
31 December 2019
Accepted:
3 September 2020
Published:
21 September 2020
Abstract: Using nickel oxide and ferric oxide materials, and ceramsite as carrier, the catalysts have been prepared by impregnation method including single-component and multi-component catalysts. The single-component and multi-component catalysts were used to study the COD removal performance of pharmaceutical secondary effluent respectively. First, the factors preparation parameters (i.e., calcination temperature and calcination time) of NixO-FexO/ceramsite and operational parameters (i.e., initial pH and the catalyst dosage) of O3-NixO-FexO/ceramsite system were optimized, respectively. The results showed that the optimum conditions of NixO-FexO/ceramsite catalyst oxidation reaction were as follows: calcination temperature is 600°C, the calcination time is 5 h, the optimum catalyst dosage is 8g/L, the initial pH is in alkaline condition, which is more conducive to the reaction. The average COD removal rate of the effluent can reach about 80% under the above best conditions. then, characteristics of the NixO-FexO/ceramsite catalysts were studied through scanning electron microscopy (SEM), X-ray fluorescence (XRF) and X-ray diffraction (XRD), respectively. The results show that Nickel and iron oxides was uniformly deposited on the ceramsite surface when NixO-FexO/ceramsite was prepared. Finally, The stability of the catalyst in the system of O3-NixO-FexO/ceramsite was studied. Collectively, these results suggest that the NixO-FexO/ceramsite should be proposed as a promising catalyst for the decomposition of ozone.
Abstract: Using nickel oxide and ferric oxide materials, and ceramsite as carrier, the catalysts have been prepared by impregnation method including single-component and multi-component catalysts. The single-component and multi-component catalysts were used to study the COD removal performance of pharmaceutical secondary effluent respectively. First, the fac...
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