Comparative Study of Physicochemical Characteristics and Catalytic Activity of Copper Oxide over Synthetic Silicon Oxide and Silicon Oxide from Rice Husk in Non-Oxidative Dehydrogenation of Ethanol

Mambetova, Manshuk; Yergaziyeva, Gaukhar; Dossumov, K.; Askaruly, Kydyr; Azat, Seitkhan; Bexeitova, Kalampyr; Anissova, Moldir; Bedelzhan, Baizhomartov

doi:10.3390/chemengineering6050074

Cited by 1 publication

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“…For this purpose, available local biowaste could be used as a carbon source [ 11 , 12 ]. In this sense, rice husk (RH) is a substantial part of the produced rice crop [ 11 , 12 , 13 ]. RH is the outer covering of rice grains and one of the most widely available agricultural wastes in many rice-producing countries.…”

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confidence: 99%

Production of Graphene Membranes from Rice Husk Biomass Waste for Improved Desalination

Seitzhanova,

Azat,

Yeleuov

et al. 2024

Nanomaterials

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Inexpensive and efficient desalination is becoming increasingly important due to dwindling freshwater resources in view of climate change and population increase. Improving desalination techniques of brackish water using graphene-based materials has the possibility to revolutionize freshwater production and treatment. At the same time, graphene matter can be cheaply mass-produced from biowaste materials. In view of this, graphene material was obtained from a four-step production approach starting from rice husk (RH), including pre-carbonation, desilication, chemical activation, and exfoliation. The results showed that the produced samples contained a mixture of graphene layers and amorphous carbon. The activation ratio of 1:5 for carbonized RH and potassium hydroxide (KOH), respectively, provided higher graphene content than the 1:4 ratio of the same components, while the number of active layers remained unaffected. Further treatment with H2O2 did not affect the graphene content and exfoliation of the amorphous carbon. Preparation of the graphene material by the NIPS technique and vacuum filtration displayed different physicochemical characteristics of the obtained membranes. However, the membranes’ main desalination function might be related more to adsorption rather than size exclusion. In any case, the desalination properties of the different graphene material types were tested on 35 g/L saltwater samples containing NaCl, KCl, MgCl2, CaSO4, and MgSO4. The produced graphene materials efficiently reduced the salt content by up to 95%. Especially for the major constituent NaCl, the removal efficiency was high.

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