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- 저자 : Liangyan Liu (검색결과 2 건)
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Rapid removal of low concentrations of mercury from wastewater using coal gasification slag
Liangyan Duan,Xiude Hu,Deshuai Sun,Yongzhuo Liu,Qing-Jie Guo,Tongkai Zhang,Botao Zhang 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.7
Coal gasification slag (CGS) is a carbon-containing solid waste used as an adsorbent to remove low concentrations of mercury from wastewater in a series of batch tests to assess its adsorption properties and safe storage. The results showed that the adsorption of mercury on CGS was a very rapid and efficient process, and adsorption equilibrium was reached in only 10-40 min. A pseudo-second-order kinetics model provided a better fit to the equilibrium data. The adsorption capacity on CGS was just slightly below the value of active carbon. CGS showed the highest mercury removal efficiency at a solution pH of 4. Although the presence of other metal cations and anions affected the adsorption, CGS showed good selectivity for mercury ions. The adsorption of mercury was not affected by low concentrations of Cr3+ or Cu2+. The negative interference of anions on the removal efficiency followed the order: Cl>H2PO4 > CO3 2. The adsorption mechanism related to the functional groups included ion exchange, precipitation, coordination complexation, and surface complexation. Mercury adsorbed on CGS leached very slowly in weakly acidic or basic solution. All results of the study indicate that CGS is an economical and safe adsorbent for potential industrial applications.
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Jiansheng Wei,Liangyan Liu,Xiaolong Yuan,Dong Wang,Xinyue Wang,Wei Bi,Yan Yang,Yi Wang 한국균학회 2023 Mycobiology Vol.51 No.5
Hispidin is an important styrylpyrone produced by Sanghuangporus sanghuang. To analyzehispidin biosynthesis in S. sanghuang, the transcriptomes of hispidin-producing and non-producingS. sanghuang were determined by Illumina sequencing. Five PKSs were identifiedusing genome annotation. Comparative analysis with the reference transcriptome showedthat two PKSs (ShPKS3 and ShPKS4) had low expression levels in four types of media. Thegene expression pattern of only ShPKS1 was consistent with the yield variation of hispidin. The combined analyses of gene expression with qPCR and hispidin detection by liquid chromatography-mass spectrometry coupled with ion-trap and time-of-flight technologies(LCMS-IT-TOF) showed that ShPKS1 was involved in hispidin biosynthesis in S. sanghuang. ShPKS1 is a partially reducing PKS gene with extra AMP and ACP domains before the KSdomain. The domain architecture of ShPKS1 was AMP-ACP-KS-AT-DH-KR-ACP-ACP. Phylogenetic analysis shows that ShPKS1 and other PKS genes from Hymenochaetaceaeform a unique monophyletic clade closely related to the clade containing Agaricales hispidinsynthase. Taken together, our data indicate that ShPKS1 is a novel PKS of S. sanghuanginvolved in hispidin biosynthesis.
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