Artificial neural network modelling of As(III) removal from water by novel hybrid material

The present study reported a method for removal of As(III) from water solution by a novel hybrid material (Ce-HAHCl). The hybrid material was synthesized by sol–gel method and was characterized by XRD, FTIR, SEM–EDS and TGA–DTA. Batch adsorption experiments were conducted as a function of different variables like adsorbent dose, pH, contact time, agitation speed, initial concentration and temperature. The experimental studies revealed that maximum removal percentage is 98.85 at optimum condition: pH = 5.0, agitation speed = 180 rpm, temperature = 60 °C and contact time = 80 min using 9 g L⁻¹ of adsorbent dose for initial As(III) concentration of 10 mg L⁻¹. Using adsorbent dose of 10 g L⁻¹, the maximum removal percentage remains same with initial As(III) concentration of 25 mg L⁻¹ (or 50 mg L⁻¹). The maximum adsorption capacity of the material is found to be 182.6 mg g⁻¹. Subsequently, the experimental results are used for developing a valid model based on back propagation (BP) learning algorithm with artificial neural networking (BP-ANN) for prediction of removal efficiency. The adequacy of the model (BP-ANN) is checked by value of the absolute relative percentage error (0.293) and correlation coefficient (R² = 0.975). Comparison of experimental and predictive model results show that the model can predict the adsorption efficiency with acceptable accuracy.     

蜂窝纸板动态压缩性能试验研究

首先介绍了缓冲材料的特性以及蜂窝纸板作为近些年来出现的一种新型缓冲材料的优越性,接着对缓冲材料动态压缩性能试验方法进行了阐述说明,最后通过一系列试验数据对蜂窝纸板的动态压缩性能进行了分析研究,重点研究了温湿度预处理对蜂窝纸板动态压缩性能的影响。     

功能化多孔材料对CO_2的吸附分离研究进展

功能化多孔材料拥有优越的CO_2吸附和存储性能,在燃煤电厂、玻璃炉窑、水泥厂、钢铁厂等高耗能工矿企业采用CO_2吸附技术,对CO_2减排、减缓温室效应具有重要意义。随着研究的不断深入,新型CO_2吸附材料呈现出廉价、易获取、高吸附率等趋势,当前研究重点集中在介孔硅、金属有机框架、沸石、活性炭、聚合物等的表面功能化。总结了上述典型吸附剂功能化的最新成果,重点介绍多孔吸附材料的功能化方法、吸附机理与吸附动力学的研究进展,并提出多孔材料对CO_2的吸附分离的研究空间和发展趋势。     

应用绿色材料的室内设计对室内空气质量的影响分析研究

多数室内装饰材料中含有氡、苯、甲醛等挥发性有害物质,对室内空气造成污染的同时,还危害人体健康.采用绿色材料进行室内设计,可降低室内空气污染.对室内空气中的污染源进行研究,分析可吸入颗粒、甲醛、人造板材、地毯、壁纸及涂料等对空气质量的影响.通过对涂料、抗菌材料、无机木材和无机玻璃的应用进行论述,完成应用绿色材料的室内空气质量分析.采用绿色材料装饰后,对室内各区域空气质量进行检测,全面分析绿色材料对室内空气质量的影响.     

模糊聚类法在化学事故中未知化学品判断的应用研究

介绍一种基于微机的有毒有害物质判定方法。用模糊聚类分析法对已有化学品知识库分类。通过对化学品事故现场观察到的综合信息的核查和量化，根据一个判定准则和优化方案，找到未知化学品的归属，同时给出一个比较保守的判断结果，作为突发事故的急救处理和对环境危害的快速评估依据。     

用废砖制作利废型轻质墙体材料试验研究

采用正交试验的方法,研究了废砖、废聚苯粒及天然砂的不同配比对利废型轻质墙材性能的影响,配制出了抗压强度5.0 MPa以上,表观密度1 100 kg/m3以下,导热系数0.2 W(/m.K)以下,50次冻循环强度损失率20%以下,质量损失率5%以下的利废型轻质墙材,并讨论了骨料的不同配比与性能的关系。     

Materials for alternative plant protection

Abstract

Information will be presented as to the use of various materials for alternative protection of crop plants against fungal pathogens.     

Properties of alkali-activated fly ash: high performance to lightweight

Alkali ash material (AAM) concrete is a unique material that is sustainable and cost-effective because it utilises waste fly ash, and has properties superior to other concrete products. The AAM concrete described here is produced from the addition of inexpensive chemicals to fly ash. AAM can be used to create a wide range of materials including high performance concrete (HPC-AAM) and lightweight (LW-AAM). The high performance AAM provides rapid strength gain along with high ultimate strengths of more than 110 MPa (16000 psi). LW-AAM can produce materials with densities ranging from 1200 to 2200 kg/m³ and compressive strengths from 2 (290 psi) to 65 MPa (9500 psi). Both HPC-AAM and LW-AAM have far better environmental resistance than Portland cement concrete, resisting attack from sulphuric acid (H₂SO₄), hydrochloric acid (HCl) and organic acids. AAMs resists freeze–thaw attack and high abrasion, possesses low chloride permeability and does not exhibit alkali silica reactivity.