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2017



                    作     者: Liu Peng; Ptacek Carol J.*; Elena Krista M. A.; Blowes David W. ;Gould W.
               Douglas ;Finfrock Y. Zou ;Wang Alana O. ;Landis Richard C.
                    JOURNAL OF HAZARDOUS MATERIALS  卷 : 347   页 : 114-122   出版年 : APR 5

               2018

                    摘     要：The application of biochar to treat mercury (Hg) in the environment is being
               proposed on an increasing basis due to its widespread availability and cost effectiveness. However,
               the efficiency of Hg removal by biochars is variable due to differences in source material

               composition. In this study, a series of batch tests were conducted to evaluate the effectiveness o
               f sulfurizedbiochars (calcium polysulfide and a dimercapto-related compound, respectively) for

               Hg removal; Hg-loaded biochars were then characterized using synchrotron-based techniques.
               Concentrations of Hg decreased by >99.5% in solutions containing the sulfurized biochars.

               Sulfur X-ray absorption near-edge structure (XANES) analyses indicate a polysulfur-like
               structure in polysulfide-sulfurized biochar and a thiol-like structure (shifted compared to

               dimercapto) in the dimercapto-sulfurizedbiochar. Micro-X-ray fluorescence (mu-XRF) mapping
               and confocal  X-ray micro-fluorescence imaging (CXMFI) analyses indicate Hg is distributed

                                                              primarily on the edges of sulfurized biochar
                                                              and throughout unmodified biochar particles.

                                                              Hg extended X-rayabsorption fine structure
                                                              (EXAFS) analyses show Hg in enriched areas

                                                              is bound to chlorine (CI) in the unmodified
                                                              biochar and to Sin sulfurized biochars. These

                                                              results indicate that Hg removal efficiency
                                                              is enhanced after sulfurization through the

                                                              formation  of  strong  bonds  (Hg-S)  with
                                                              S-functional groups in the sulfurized biochars.

               (C) 2017 Elsevier B.V. All rights reserved.
                    论文链接：https://doi.org/10.1016/j.jhazmat.2017.12.051

                    20.Evidence  for  strong  association  of  short-duration  intense  rainfall  with

               urbanization in Beijing urban area
                    作   者 : Yang Ping； Ren Guoyu*； Yan Pengcheng
                    JOURNAL OF CLIMATE  卷 : 30   期 : 15   页 : 5851-5870   出版年 : AUG 2017

                    摘   要：Correlations of the urban heat island intensity (UHII) and key surface


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