Influence of cation building blocks of metal hydroxide precipitates on their adsorption and desorption capacity for phosphate in wastewater—A screening study

2016 ◽  
Vol 488 ◽  
pp. 145-153 ◽  
Author(s):  
Asya Drenkova-Tuhtan ◽  
Michael Schneider ◽  
Karl Mandel ◽  
Carsten Meyer ◽  
Carsten Gellermann ◽  
...  
Keyword(s):  
Building Blocks ◽  
Metal Hydroxide ◽  
Adsorption And Desorption ◽  
Screening Study ◽  
Desorption Capacity

scholarly journals Reuse Feasibility of Electrocoagulated Metal Hydroxide Sludge of Textile Industry in the Manufacturing of Building Blocks

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Tanveer Mehedi Adyel ◽  
Syed Hafizur Rahman ◽  
Mohammad Moniruz Zaman ◽  
Hossain Md. Sayem ◽  
Mala Khan ◽  
...  
Keyword(s):  
Firing Temperature ◽  
Textile Industry ◽  
Water Adsorption ◽  
Construction Material ◽  
Building Blocks ◽  
Metal Hydroxide ◽  
Key Factors ◽  
Foreign Exchange Earning ◽  
Textile Industries

During the last decade, the growing load of sludge from textile industries, the top foreign exchange earning sector of Bangladesh, is a common nuisance to environmental system and community health. The present study was aimed to minimize the environmental impact from the disposal of Electrocoagulated Metal Hydroxide Sludge (EMHS) by using it as a partial substitute of clay in the manufacturing of construction material like building blocks (BBs). Different batches of normal and pressurized building blocks (NBBs and PBBs, resp.) were prepared using up to 50% EMHS with clay and then fired at a particular temperature. EMHS proportion in the mixture and firing temperature were two key factors determining the quality of BB. BB did not show any deformation or uneven surfaces at any of the examined firing temperature. At higher firing temperature and EMHS proportion, more weight loss and shrinkage of BB were noticed. Higher compressive strength and lower water adsorption were found at lower EMHS content and higher firing temperature. It was explored that NBB and PBB with 20 and 30% EMHS in clay, respectively, and fired at 1050 °C would be usable for nonloading applications; namely, ornamental bricks, decoration purposes, and fence of garden.

Study on Characters of Nitrogen Adsorption and Desorption of Sediment in Ganjiang River

2012 ◽  
Vol 212-213 ◽  
pp. 391-394
Author(s):  
Qiu Lin Ouyang ◽  
Gui Qing Gao ◽  
Su Su Liu ◽  
Xiao Ling Shi
Keyword(s):  
Theoretical Basis ◽  
Poyang Lake ◽  
Nitrogen Adsorption ◽  
Sediment Concentration ◽  
Isothermal Adsorption ◽  
Desorption Process ◽  
Adsorption And Desorption ◽  
Nitrogen Desorption ◽  
Adsorption Of Nitrogen ◽  
Desorption Capacity

Sediment has the function of adsorption and desorption of the nitrogen in water body. This study provides the theoretical basis of calculating the nitrogen content discharged into the Poyang Lake. The results show the nitrogen adsorption of sediment reaches balance basically in about 4~ 6h, the adsorption capacity is increased with the increment of the initial concentration of nitrogen, and decreased with the increment of sediment conentration.The isothermal adsorption of nitrogen by sediment can be fitted preferably by Henry and Langmuir equation.The adsorption and desorption process can be fitted by Langmuir equation.The nitrogen desorption of sediment reaches balance basically in about 8~14h.The nitrogen desorption capacity of sediment is decreased with the increment of sediment concentration.

scholarly journals Interconnection of organic–inorganic hybrid nano-building blocks towards thermally robust mesoporous structures

Nanoscale ◽  
2021 ◽  
Author(s):  
Naoki Tarutani ◽  
Riona Sato ◽  
Wataru Yamazaki ◽  
Kiyofumi Katagiri ◽  
Kei Inumaru ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Building Blocks ◽  
Organic Anions ◽  
Metal Hydroxide ◽  
Inorganic Hybrid ◽  
Mesoporous Structures

The robustness of layered metal hydroxide nanocrystal-based mesoporous materials was improved by interconnecting the nanocrystals through polymerization of intercalated organic anions.

Research on the Contaminants Adsorption and Removal by Macroporous Resins in the Textile and Dyeing

2020 ◽  
Vol 852 ◽  
pp. 32-40
Author(s):  
Shuang Han ◽  
Meng Li ◽  
Qian Zhang ◽  
Min Zhong ◽  
Fang Lu
Keyword(s):  
Flow Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Packed Column ◽  
Environmental Water ◽  
Dyeing Wastewater ◽  
Adsorption And Desorption ◽  
Initial Concentration ◽  
Macroporous Resins ◽  
Desorption Capacity

Textile and dyeing wastewater is the major source of environmental water pollution all over the world, which has complex composition so that conventional methods are difficult to remove and degrade. Based on the relevant research, this paper proposes to add further treatment by using macroporous resins on the basic of the conventional treatment and explore the effects of the adsorption and desorption, such as the pH value, initial concentration of , temperature and the flow rate. The performance of six kinds of macroporous resins (DA-2, D280, DA201, D3520, AB-8 and DA-201) for the advanced treatment in the textile and dyeing wastewater has been evaluated. The adsorption and desorption properties of the contaminants, which tested by the six kinds of the macroporous resins in the textile and dyeing, have been compared. According to the results, D3520 resin holds the highest adsorption and desorption capacity. (15.6mg/g for adsorption capacity, 15.1mg/g for desorption capacity). The effects of the pH value, initial concentration of , temperature and the flow rate on removal of by D3520 macroporous resin have been tested. The results showed that the removal of increased with the pH value and initial concentration of COD increasing and the data of its adsorption fitted the Langmuir isotherm best. Besides, 92.49% could be removed after 8h of adsorption at 25 °C. Dynamic adsorption and desorption experiments have been carried out on the packed column of D3520 resins as a reference for engineering applications, the results showed that the D3520 resin could still reach 79.5% removal rate after adsorptions-regeneration for five times.

scholarly journals Synthesis and Grafted NH2-Al/MCM-41 with Amine Functional Groups as Humidity Control Material from Silicon Carbide Sludge and Granite Sludge

Processes ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 2107
Author(s):  
Ya-Wen Lin ◽  
Wei-Hao Lee ◽  
Kae-Long Lin ◽  
Bo-Yi Kuo
Keyword(s):  
Silicon Carbide ◽  
Surface Properties ◽  
Functional Groups ◽  
Low Cost ◽  
Moisture Adsorption ◽  
Adsorption And Desorption ◽  
Japanese Industrial Standard ◽  
Building Engineering ◽  
Desorption Capacity ◽  
Mcm 41

Mesoporous Al/MCM-41 was synthesized by extracting silicon carbide sludge and granite sludge as the sources of silicon and aluminum. Different concentrations of aminosilane (2.5, 5, 7.5 vol.%) were used to reflux the grafted NH2-Al/MCM-41 with amine functional groups (NH2-Al/MCM-41). The physical and chemical characteristics were analyzed. The results confirmed that silicon carbide sludge and granite sludge can effectively synthesize Al/MCM-41 with low cost and environmental protection. Reflow grafted amine functional groups can effectively improve the surface properties of NH2-Al/MCM-41. The moisture adsorption and desorption capacity of grafted NH2-Al/MCM-41 with amine functional groups was also studied. Based on moisture adsorption and desorption capacity, the surface properties of NH2-Al/MCM-41 were studied. When 5 vol.% of NH2-Al/MCM-41 amine functional groups is added, the moisture adsorption and desorption capacity is best. When the relative humidity = 95%, the equilibrium moisture content is 39.4 kg/kg, which complies with the standard of Japanese Industrial Standard (JIS A 1475). Therefore, the use of waste derived from the industry to replace expensive commercial materials was simple and environmentally friendly, and the grafted NH2-Al/MCM-41 with amine functional groups can be utilized in multiple applications, particularly as moisture regulation materials in building engineering.

scholarly journals An Experimental Study on the Adsorption and Desorption of Cu(II) in Silty Clay

Geofluids ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Shuang Xie ◽  
Zhang Wen ◽  
Hongbin Zhan ◽  
Menggui Jin
Keyword(s):  
Heavy Metals ◽  
Organic Matter ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Silty Clay ◽  
Isothermal Adsorption ◽  
Adsorption Activity ◽  
Adsorption And Desorption ◽  
The Impact ◽  
Desorption Capacity

Heavy metals such as Cu(II) are widespread in the environment, and the impact of heavy metals on the environment of soils depends on the ability of soils to immobilize these pollutants. It is necessary to investigate the mechanism of interaction between heavy metal and soil from a soil remediation perspective. In this study, a series of experiments were conducted to investigate the adsorption and desorption behavior of Cu(II) in silty clay. Several impact factors such as pH, organic matter, temperature, and coexisted ions Zn(II) were considered. It was found that the adsorption process reached equilibrium after 4 hours of the experiment, and the data can be fitted well by the Elovich model and the double-constant model for the kinetic sorption process. The isothermal adsorption results showed that the adsorption rate reached a peak value when the initial concentration was about 20 mg L−1. The decrease of H+ can increase the adsorption activity of Cu(II) and reduce the ability of the desorption of Cu(II) ions. The adsorption capacity of Cu(II) is less than the desorption capacity under the condition of strong acidity and low concentration of Cu(II). In addition, the adsorption capacity of the native soil on Cu(II) was larger than that of the soil with the removal of organic matter, while the opposite was true for the desorption capacity on Cu(II). The maximum adsorption of Cu(II) occurred at 35°C for this study, and the binding energy increased as the temperature increased. Thermodynamic analysis revealed that the adsorption process of Cu(II) was spontaneous and endothermic. The Freundlich, Langmuir, Temkin, and Henry adsorption models were used for analyzing the adsorption isotherm of Cu(II), and it was found that the Freundlich model agreed the best with the experimental data compared with other three models. The results of the competitive adsorption experiments indicated that the competitive capacity of Cu(II) was greater than that of Zn(II) in low-permeability media such as silty clay, and the existence of binary metals can weaken the adsorption force between the single metal and the soil surface.

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