Synthesis of carbon molecular sieve microspheres via amino phenolic resin as precursor formed from in-situ reaction composite micelles

The carbon molecular sieve microspheres (CMSm) is one kind of porous carbonaceous materials. Owing to its high surface area and stability, CMSm have been attracted immense attention in various fields. In this study, the CMSm with tunable pore structure has been synthesized via self-assembling, in-situ reaction and soft-templating method in aqueous system. Meanwhile, the influence of carbonization temperature, heating rate, surfactant content and the amount of pore-forming agent (1, 3, 5-trimethylbenzene) on the morphology and pore properties of CMSm were studied. The result of nitrogen adsorption/desorption analysis indicates that the volume of the micropores increases as carbonization temperature increases, and generally decreases as the heating rate increases. The amount of surfactant and pore-forming agent have little influence on the volume of the micropores. It is also found that the CMSm have good hydrogen storage performance.     

某工业园区污水厂的工艺诊断及水质优化研究

针对某工业园区污水厂出水TN超标问题,对工业园区和污水厂存在的问题进行了分析,提出源头冲击管控、推流器角度改造、进水余氯控制、跌水富氧控制、回流硝化液DO控制、外加碳源优选的6大优化措施.采取以上措施进行改造后,污水厂出水TN稳定达标,出水水质达到GB 18918—2002《城镇污水处理厂污染物排放标准》中的一级A标准...     

A new structural model of effective thermal conductivity for heterogeneous materials with co-continuous phases

A new structural model for a heterogeneous material with multiple continuous phases is proposed. The corresponding equation for effective thermal conductivity was derived using three methods. The new model is substantially different from the conventional five fundamental structural models (Series, Parallel, two forms of Maxwell–Eucken, Effective Medium Theory). The model has two applications. First, as a new fundamental structural model to produce composite models using the combinatory rules previously proposed by J.F. Wang, J.K. Carson, M.F. North, D. J. Cleland, A new approach to modelling the effective thermal conductivity of heterogeneous materials, International Journal of Heat and Mass Transfer, 49 (17–18) (2006) 3075–3083. Second, to narrow the bounds of the effective thermal conductivity for heterogeneous materials where the physical structure can be characterised into general classes.     

Excited-state absorption of meso-tetrasulfonatophenyl porphyrin: Effects of pH and micelles

The influence of the environment on the excited state transitions of meso-tetrakis(p-sulfonatophenyl) porphyrin (TPPS) is reported. TPPS was investigated in protonated and non-protonated forms, and in the presence of the cationic cetyltrimethylammonium bromide (CTAB) micelles. The singlet excited-state absorption spectra were measured by using the white-light continuum Z-scan technique and the triplet–triplet absorption spectra were acquired employing an association of laser flash photolysis and Z-scan techniques. Our results show that the perseveration of the molecular symmetry, upon excitation, depends on the state of multiplicity of the molecules, as well as on the environment and structural characteristics of the porphyrin. Additionally, it was observed that for excited molecules, the ring distortion caused by the protonation of porphyrin ring has great influence on the changes observed for the symmetry and vibronic structure. The results clearly show that the porphyrin investigated is a promising candidate for optical limiting applications for all investigated environments.     

纳米材料的生态环境暴露与生态环境效应研究及其控制体制

总结了纳米材料的生态环境暴露途径,分析了纳米材料在环境中的迁移、转化和蓄积过程,选择几种典型纳米材料研究对陆生植物的影响、对水体及水生生物的影响和对土壤的影响,并且依据毒理学或健康效应数据,结合工人的接触评价,综合判定危害的程度,提出了纳米材料的控制体制,具体的控制流程包括:上市前的检测、工艺控制、个人防护装备、生物监测与环境监测。同时对纳米材料的生态环境暴露与生态环境效应下一步研究进行了展望。