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Yongqiu Cai

Bio: Yongqiu Cai is an academic researcher from University of Nottingham Malaysia Campus. The author has co-authored 1 publications. Previous affiliations of Yongqiu Cai include Dongguan University of Technology.

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TL;DR: In this paper, a comprehensive review on multi-product biorefinery was carried out from upstream processing stage to downstream processing stage, and identify critical processes and factors that impact bioactive material acquisition and retention.

14 citations


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TL;DR: In this paper , a review mainly focused on the potential of algae and their specific mechanisms involved in wastewater treatment and energy recovery systems leading to important industrial precursors, which is highly beneficial for scientists, wastewater treatment plant operators, freshwater managers, and industrial communities to support the sustainable development of natural resources.

23 citations

Journal ArticleDOI
TL;DR: Algae can biosynthesis nanoparticles in intercellular or extracellular ways, depending on their cellular reactions inside the cells, their secondary metabolites, or extraction of the algal contents as mentioned in this paper .

12 citations

Journal ArticleDOI
TL;DR: In this article , the green synthesis of silver nanoparticles using AgNO 3 salt and the peel extract of bitter orange (Citrus aurantium) as a reducing agent was modeled and optimized by central composite design.
Abstract: Nowadays, the biosynthesis of metal nanoparticles (NPs) through eco-friendly, cost-effective, and sustainable methods has drawn considerable attention. In this study, the green synthesis of silver NPs using AgNO 3 salt and the peel extract of bitter orange (Citrus aurantium) as a reducing agent was modeled and optimized by central composite design (CCD). Accordingly, the process parameters including pH (7–11), time (0–4 h), and the ratio of extract/salt solution (0:100–20:80 v/v) were considered to model the responses including the spectrophotometric wavelength of maximum absorbance ( λ max ) and the maximum absorbance value at λ max (A max ), which represented the size and concentration of Ag NPs, respectively. Additionally, the stabilizing effect of glycerol (ratio of glycerol to salt 0–10 g/g) on the optimum treatment was studied using spectrophotometric and SEM analyses. The results showed that the quadratic and linear models were acceptably fitted to the experimental responses of A max and λ max , respectively. The optimization results demonstrated that the optimal reaction parameters to achieve the maximum A max were pH = 10.92, time = 3.5 h and ratio of extract/salt = 17.94:82.06 (v/v). Furthermore, glycerol could favorably play a stabilizer role in the optimum biosynthesized Ag NPs during the reaction and 14 days of storage at room temperature. The ICP-OES and TEM analyses of the stabilized Ag NPs (with 2.5 g/g glycerol) showed the presence of Ag element as nanospheres with ∼20 nm in size. The Ag NPs had great antibacterial properties against Staphylococcus aureus and Escherichia coli . Therefore, the bitter orange peel extract and glycerol could be promisingly used as novel reducing and stabilizing agents, respectively, to synthesize nanosilver via an eco-friendly and economical green approach. • Green synthesis of nanosilver using the bitter orange peel extract was investigated. • Central composite design was used to model and optimize the process parameters. • Glycerol favorably played a stabilizer role in the biosynthesized Ag NPs. • The ICP-OES and TEM analyses showed the presence of 20 nm Ag nanospheres. • These Ag NPs had great antibacterial properties against S. aureus and E. coli.

3 citations

Journal ArticleDOI
10 Jan 2023-Energies
TL;DR: Algae have the potential to be used as a feedstock for the synthesis of valuable compounds and biofuels as mentioned in this paper , and can be further transformed into biofuel, biogas, and biochar using different thermochemical processes such as microwave pyrolysis, pyropolysis, torrefaction, and hydrothermal conversion.
Abstract: Algae have the potential to be used as a feedstock for the synthesis of valuable compounds and biofuels. In addition, algal waste can be further transformed into biofuel, biogas, and biochar using different thermochemical processes such as microwave pyrolysis, pyrolysis, torrefaction, and hydrothermal conversion. Due to its high specific surface area, rapid electron transport, and graphitic carbon structure, algal biochar carbonized at high temperatures has shown outstanding performance for applications as CO2 adsorbents, supercapacitors, and persulfate activation. Due to the combination of various functional groups and porous structures, the algae biomass pyrolysis at a moderate temperature produced high-quality biochar that shows high performance in terms of pollutant removal, while low-temperature pyrolysis produces coal fuel from algae via torrefaction. Over time, there have been exponentially more petroleum-based polymers created that have harmful impacts on both humans and the environment. As a result, researchers are becoming more interested in algae-based biopolymers as a potential alternative strategy for establishing a sustainable circular economy globally. The advantages of microalgal biopolymer over other feedstocks are its capacity to compost, which provides greenhouse gas credits, its quick growth ability with flexibility in a variety of settings, and its ability to minimize greenhouse gas emissions.

3 citations