Efficient heavy metal recycling and water reuse from industrial wastewater using new reusable and inexpensive polyphenylene sulfide derivatives

Heavy metal(HM)pollution is a serious environment problem.Recovering HM from industrial wastewater by efficient adsorbents is a sustainable method due to recycling HM and acquiring reusable water.However,popular efficient adsorbents are usually expensive or non-reusable.In this paper,methods of efficient HM recycling and water reuse from industrial wastewater were developed using efficient adsorbents,new polyphenylene sulfide derivatives,which are recyclable and stable in an acidic,alkaline or oxidative aqueous solution.Moreover,they can efficiently and quickly adsorb HM ions.The maximum adsorption capacities of these adsorbents for HM ions are at the range from 51.3-184.2 mg·g^(-1).The adsorption equilibrium times of them for HM ions are at the range from 10 to 80 min.Therefore,this paper suggests sustainable methods of HM recovery and water reuse from industrial wastewater.

世界遗产申报能促进旅游发展吗?

近年来,世界遗产申报特别是自然遗产申报进入前所未有的激烈竞争阶段。之所以竞争激烈,背后的原因大家心知肚明:通过世界遗产申报拉动当地旅游发展,但是,世界自然遗产申报真的是旅游发展的'灵丹妙药',能促进当地旅游快速发展吗?当下大部分人给出了肯定的回答。一方面,目前国内成功的旅游地大多是世界遗产地,如黄山、泰山、九寨沟、张家界(武陵源)等,人们很容易想当然地认为,有了世界遗产的'金字招牌',不愁游客不过来。另一方面,国内媒体经常会刊发如某地世界遗产申报成功后,游客人数爆长,为当地创造可观经济收入的报道,对受众的认知也会造成一定影响。

Introduction:tourism and built heritage

Built heritage,an important part of the cultural heritage of towns and cities,is always involved in both industry practices and scholarly discussions regarding tourism.As one of the original forms of heritage,built heritage enjoys a popular image;in the eyes of the public,built heritage represents one of the most conceivable heritage types.When discussing heritage tourism,appealing pictures can always be evoked in tourists'minds-ancient gardens where summer breeze blows,faded castles that spread fairy tales and mysteries,and labyrinthine streets in which traditional lifestyles are preserved.Visiting these sites is inspirational;built heritage sites encourage visitors to deeply enjoy themselves,appreciate the historical layers of the built environment,and sustain a strong sense of connectedness with places and belonging in our societies.Over the past decades,the world has observed these marvels and continues to promote this market.

Anomalous enhancement oxidation of few-layer MoS_(2)and MoS_(2)/h-BN heterostructure

Because of profound applications of two-dimensional molybdenum disulfide(MoS_(2))and its heterostructures in electronics,its thermal stability has been spurred substantial interest.We employ a precision muffle furnace at a series of increasing temperatures up to 340℃to study the oxidation behavior of continuous MoS_(2)films by either directly growing mono-and fewlayer MoS_(2)on SiO_(2)/Si substrate,or by mechanically transferring monolayer MoS_(2)or hexagonal boron nitride(h-BN)onto monolayer MoS_(2)substrate.Results show that monolayer MoS_(2)can withstand high temperature at 340℃with less oxidation while the few-layer MoS_(2)films are completely oxidized just at 280℃,resulting from the growth-induced tensile strain in few-layer MoS_(2).When the tensile strain of films is released by transfer method,the stacked few-layer MoS_(2)films exhibit superior thermal stability and typical layer-by-layer oxidation behavior at similarly high temperature.Counterintuitively,for the MoS_(2)/h-BN heterostructure,the h-BN film itself stacked on top is not damaged and forms many bubbles at 340℃,whereas the underlying monolayer MoS_(2)film is oxidized completely.By comprehensively using various experimental characterization and molecular dynamics calculations,such anomalous oxidation behavior of MoS_(2)/h-BN heterostructure is mainly due to the increased tensile strain in MoS_(2)film at elevated temperature.

Effects of seed particles Al2O3, Al2（SO4）3 and H2SO4 on secondary organic aerosol

Seed particles Al2O3, Al2（SO4）3 and H2SO4 were selected to investigate their effects on secondary aerosol （SA） formation in toluene/NOx photooxidation under sulfur dioxide （SO2） and ammonia （NH3）. Effect of seed particles on SA formation was related to their acid-base properties and the presence of acid or alkaline gases. Under NH3-poor condition, SA formation increased with increasing SO2 concentration due to the acid-catalyzing effect of the oxidation products of SO2 （i.e. H2SO4）, The enhancing effect of SO2 became unobvious under NH3-rieh condition, because NH3 would eliminate the acid-catalyzing effect by neutralizing the acid products. Acidic seeds H2SO4 accelerated SA formation under either SO2 or NH3 condition. Weak acidic Al2（SO4）3 seeds didn＇t affect obviously on SA formation. The inhibiting effect of amphoteric seeds Al2O3 on SA formation was related to the presence of SO2 / NH3 due to their acid-base property. Under NH3-poor condition, the inhibiting effect of Al2O3 on SA formation decreased with increasing concentration of SO2, while under NH3-rich condition, the inhibiting effect wasn＇t remarkable.