专业英语综述1

The development with MOFs in application

It is well known that Metal–organic frameworks (MOFs) plays a important role in the profession of organic and inorganic, also known as porous coordination polymers (PCPs), are an emerging type of porous materials which are formed by the self-assembly of metallic centers and bridging organic linkers. Design and synthesis of organic linkers are very critical to target MOFs with desired structures and properties. In this review, we summarize and highlight the part that the recent development of porous MOFs that are constructed from the multicarboxylate ligands containing m-benzenedicarboxylate moieties, and their promising applications in gas storage and separation and heterogeneous catalysis. 1. Introduction

With the fast development rate of our society, all kinds of technology had presented a prosperous scene ,especially in chemical profession and chemical industry. A lot of chemical productions have been manufactured, like medicine drugs, pesticide, cosmetic, fossil fuel and so on. But in this procedure, there are many harmful waste pollutant had been made, so we must come up with good ideas to settle it. It is a challenge project for us.

While much more attention of the MOF community has been devoted to adsorption and purification of gases, there is now also a vast body of data on the capability of MOFs to separate and purify liquid mixtures.

Initial studies focused on separation of petrochemicals in apolar backgrounds, but the attention has moved now to the separation of complex, e.g. chiral compounds, and to the isolation of bio-based compounds from aqueous media. We here give an overview of most of the existing literature, with an accent on separation mechanisms and structure–selectivity relationships.

A large portion of the production costs areassociated with purification steps, for instance using solvent extraction, adsorption, crystallization and distillation processes. 1,2 Presently, distillation accounts for more than 90% of all separation processes in the chemical industry. 3 Due to the reactive nature or the decomposition of certain chemicals and the high costs associated with distillation, valid alternatives are needed for a sustainable chemical industry in the future. 4 Adsorptive separation is such a promising alternative; it is already used in a multitude of processes in industry today. 5 An adsorbent is able to separate a mixture of chemicals into pure compounds, mostly based on differences in the interaction between the adsorbent and the constituents of the mixture. 6 The efficiency of separation is therefore strongly determined by the characteristics of the adsorbent. Microporous materials such as zeolites, 3 activated carbon,7 carbon molecular sieves,8 aluminophosphates,9 inorganic or polymeric resins 10 and composite materials 11 have already been studied intensively for adsorptive separations .However, in order to