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Biochar-supported nZVI (nZVI/BC) for contaminant removal from soil and water: A critical review
Wang, Shengsen,Zhao, Mingyue,Zhou, Min,Li, Yuncong C.,Wang, Jun,Gao, Bin,Sato, Shinjiro,Feng, Ke,Yin, Weiqin,Igalavithana, Avanthi Deshani,Oleszczuk, Patryk,Wang, Xiaozhi,Ok, Yong Sik Elsevier 2019 Journal of hazardous materials Vol.373 No.-
<P><B>Abstract</B></P> <P>The promising characteristics of nanoscale zero-valent iron (nZVI) have not been fully exploited owing to intrinsic limitations. Carbon-enriched biochar (BC) has been widely used to overcome the limitations of nZVI and improve its reaction with environmental pollutants. This work reviews the preparation of nZVI/BC nanocomposites; the effects of BC as a supporting matrix on the nZVI crystallite size, dispersion, and oxidation and electron transfer capacity; and its interaction mechanisms with contaminants. The literature review suggests that the properties and preparation conditions of BC (e.g., pore structure, functional groups, feedstock composition, and pyrogenic temperature) play important roles in the manipulation of nZVI properties. This review discusses the interactions of nZVI/BC composites with heavy metals, nitrates, and organic compounds in soil and water. Overall, BC contributes to the removal of contaminants because it can attenuate contaminants on the surface of nZVI/BC; it also enhances electron transfer from nZVI to target contaminants owing to its good electrical conductivity and improves the crystallite size and dispersion of nZVI. This review is intended to provide insights into methods of optimizing nZVI/BC synthesis and maximizing the efficiency of nZVI in environmental cleanup.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aggregation and passivation of nZVI can be alleviated by surfactants and doping methods. </LI> <LI> BC hinders corrosion and improves the dispersion and electron transfer of nZVI. </LI> <LI> Properties of nZVI depend on those of the BC, feedstock and pyrogenic temperature. </LI> <LI> BC enhances electron transfer from nZVI to the contaminants due to the presence of quinone and graphene moieties. </LI> <LI> nZVI/BC shows strong ability to remove HMs, nitrates, and organic contaminants in soil and water. </LI> </UL> </P>
Ling Mao,Yuankai Li,Chao Pan,Jianlin Yang,Qin Hu,Yuncong Zheng,Jinbin Zhao 전력전자학회 2024 JOURNAL OF POWER ELECTRONICS Vol.24 No.4
Parallel three-level neutral point clamped (3L-NPC) inverters are widely used in power conversion applications, such as new energy generation and high voltage inverters. However, the zero-sequence circulating current (ZSCC) between two inverters degrades the whole performance of the system. To suppress the ZSCC in parallel inverters and improve the quality of output current, this study proposes an MPC strategy based on the virtual location vector. First, to reduce the computational burden of MPC, the virtual location vector is constructed by the output current of two inverters so that the control of the parallel inverters is similar to that of a single inverter. Then, the virtual location vector is obtained by using the direct power control method. Finally, the sets of candidate voltage vectors for MPC are determined on the basis of this reference voltage vector and the magnitude of ZSCC. Moreover, the optimal vectors calculated by MPC are assigned to the two inverters. Compared with the traditional MPC strategy, the MPC strategy proposed in this study has better steady state and transient performance with less computational burden. The proposed method is validated in simulation and experimental platforms.
Enhanced arsenic removal by biochar modified with nickel (Ni) and manganese (Mn) oxyhydroxides
Shengsen Wang,Bin Gao,Yuncong Li 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.37 No.-
Two biochar composites were synthesized by either pyrolysis of Ni/Mn oxide-modified pinewoodfeedstock (NMMF) or precipitation of Ni/Mn-LDHs onto pristine biochars (NMMB). Both sorbents werecharacterized and results indicated that NiO and MnO were dominant crystals in NMMF, whereas Ni/Mn-LDHs in NMMB. Sorption experiment showed that the maximum As(V) sorption capacity were 0.549 and6.52 g kg 1 for NMMF and NMMB, respectively. The As(V)-loaded sorbents can be easily desorbed with0.1 NaOH, and NMMB maintained 98% removal efficiency after two to three desorption–resorptioncycles. The As(V) sorption is mainly attributed to anion exchange and surface complexation by NMMBand surface complexation by NMMF.
Stefan Wan,Shengsen Wang,Yuncong Li,Bin Gao 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
This study examined phosphate adsorption of bamboo biochar functionalized with varying amount ofMg–Al and Mg–Fe (3:1) layered double hydroxides (LDH). Results indicated that the compositecontaining 40% Mg–Al LDH exhibited the highest phosphate adsorption with >95% phosphate saturationachieved within 1 h, following the pseudo-second-order kinetics model. Characterization and adsorptionisotherm of this composite revealed interlayer anion exchange and surface adsorption as thepredominant adsorption mechanism at low phosphate concentrations and phosphate precipitation athigh concentrations. A lettuce seedling bioassay further demonstrated that the spent LDH/biocharcomposite can be recycled as a slow-release fertilizer to enhance food production.
Jian Zhang,Ruidong Yang,Rong Chen,Yuncong C. Li,Yishu Peng,Xuefeng Wen 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.6
The concentrations of twenty-four elements intwenty-five peppers from three cultivated regions inGuizhou Province (China) were analyzed. The chemometricdata processing, including one-way analysis ofvariance, principal component analysis, linear discriminantanalysis (LDA), and orthogonal partial least squares discriminantanalysis (OPLS-DA) were executed to differentiatethe peppers. Consequently, the contents of 16elements (Arsenic, Ba, Cu, Co, Cr, Ni, Pb, Sn, Sb, Mo, Sr,Y, Zn, Ca, P, and Fe) were significantly different amongthe three regions (p\0.05). The correct discriminationrates of 25 peppers were 92.0% for LDA and 96.0% forOPLS-DA. The variable importance in the projection (VIP)values were ranged from 1.063 to 1.262 for seven elements(Tin, Fe, Zn, Y, Cr, Sr, and Mo) indicating that they playedan important role for the geographical origin traceability ofpepper. To sum up, multi-element concentrations togetherwith chemometric data-processing can be promising for thegeographical origin differentiation of pepper.
Polymorphisms in the Perilipin Gene May Affect Carcass Traits of Chinese Meat-type Chickens
Zhang, Lu,Zhu, Qing,Liu, Yiping,Gilbert, Elizabeth R.,Li, Diyan,Yin, Huadong,Wang, Yan,Yang, Zhiqin,Wang, Zhen,Yuan, Yuncong,Zhao, Xiaoling Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.6
Improved meat quality and greater muscle yield are highly sought after in high-quality chicken breeding programs. Past studies indicated that polymorphisms of the Perilipin gene (PLIN1) are highly associated with adiposity in mammals and are potential molecular markers for improving meat quality and carcass traits in chickens. In the present study, we screened single nucleotide polymorphisms (SNPs) in all exons of the PLIN1 gene with a direct sequencing method in six populations with different genetic backgrounds (total 240 individuals). We evaluated the association between the polymorphisms and carcass and meat quality traits. We identified three SNPs, located on the 5' flanking region and exon 1 of PLIN1 on chromosome 10 (rs315831750, rs313726543, and rs80724063, respectively). Eight main haplotypes were constructed based on these SNPs. We calculated the allelic and genotypic frequencies, and genetic diversity parameters of the three SNPs. The polymorphism information content (PIC) ranged from 0.2768 to 0.3750, which reflected an intermediate genetic diversity for all chickens. The CC, CT, and TT genotypes influenced the percentage of breast muscle (PBM), percentage of leg muscle (PLM) and percentage of abdominal fat at rs315831750 (p<0.05). Diplotypes (haplotype pairs) affected the percentage of eviscerated weight (PEW) and PBM (p<0.05). Compared with chickens carrying other diplotypes, H3H7 had the greatest PEW and H2H2 had the greatest PBM, and those with diplotype H7H7 had the smallest PEW and PBM. We conclude that PLIN1 gene polymorphisms may affect broiler carcass and breast muscle yields, and diplotypes H3H7 and H2H2 could be positive molecular markers to enhance PEW and PBM in chickens.