Adsorption Behavior of Lead Ions from Wastewater on Pristine and Aminopropyl-Modified Blast Furnace Slag

The potential possibility of blast furnace slag as a low-cost adsorbent to remove lead ions from wastewater was investigated in detail in the present work. Both single factor experiment and orthogonal experiment were performed to reveal the effect of pH, adsorption temperature, contact time and initial concentration of lead ions on the adsorption performance of pristine slag. In order to make clear the correlation between the lead ion adsorption performance and the structure of slag, solid state nuclear magnetic resonance (NMR) was conducted to reveal the network structure and X-ray fluorescence (XRF) was used to calculate the nonbridging oxygen in the network-forming tetrahedra. For the purpose of improving the adsorption performance, γ-aminopropyltriethoxysilane (APTES) was adopted to modify the slag via post-grafting method. The results show that the slag is predominately composed of SiO2, Al2O3, CaO and MgO, exhibiting an amorphous network structure based on SiO4 and AlO4 tetrahedra. The conditions for adsorption can be optimized as follows: a pH of 7, an adsorption temperature of 60 °C, a contact time of 120 min and an initial lead ion concentration of 40 mg·L−1. Under the optimal conditions, a removal rate of 99.98% and an adsorption capacity of 49.99 mg·g−1 are obtained for the pristine slag. The adsorption complies with the Langmuir model thermodynamically and conforms to the pseudo-second order model kinetically. It is noted that aminopropyl-modification has considerably enhanced the removal rate of lead ions from 20.71 to 64.32% and the adsorption capacity from 29.01 to 96.48 mg·g−1 since amino groups (-NH2) are more inclined to form a complex with lead ions than hydroxyl groups due to the higher nucleophilicity of amino groups than that of hydroxyl groups. However, it is necessary to develop more low-cost modification agents in the future work.

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Preparation of Hydrated Calcium Silicate Gel and its Adsorption Properties for Cu(II)

Materials Science Forum ◽

10.4028/www.scientific.net/msf.993.1445 ◽

2020 ◽

Vol 993 ◽

pp. 1445-1449

Author(s):

Shi Jie Liu ◽

Su Ping Cui ◽

Hong Xia Guo ◽

Ya Li Wang ◽

Nan Li ◽

...

Keyword(s):

Calcium Silicate ◽

High Efficiency ◽

Removal Rate ◽

Low Cost ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Adsorption Method ◽

Hydrated Calcium Silicate ◽

Adsorption Performance ◽

Optimum Reaction

Calcium silicate hydrate gel (CSH) was synthesized by calcium acetate and sodium silicate. The structure and morphology of CSH were characterized by X-ray diffraction analysis, Fourier transform infrared spectroscopy and Scanning electron microscopy. The adsorption performance of CSH was measured by static adsorption method. The results show that CSH has porous structure and large specific surface area, and the optimum reaction conditions is the reaction temperature of 25°C and calcium-silicon ratio of 1.2. It has the maximum adsorption capacity of more than 150 mg/g and the removal rate of more than 86% with Cu2+. And it shows the excellent adsorption performance, even when the concentration of Cu2+ is less than 200mg/L, the removal rate is above 90%. The research may provide a low-cost and high-efficiency adsorbent.

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Comparison and Selection of Different Medium on the Effect of Improving Soil Deodorization

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.610-613.1328 ◽

2012 ◽

Vol 610-613 ◽

pp. 1328-1332

Author(s):

Zu Xin Xu ◽

Jian Xiu Huang ◽

Huai Zheng Li ◽

Wei Bing Chen ◽

Wei Gang Wang

Keyword(s):

Blast Furnace ◽

Pressure Drop ◽

Blast Furnace Slag ◽

Removal Rate ◽

Packed Column ◽

Combined System ◽

Ammonia Gas ◽

Odor Concentration ◽

Furnace Slag ◽

Selection Of

Based on the investigation of odor concentration of retention tank in combined system, it aim at the removal of mixed odor and pressure drop with blast furnace slag, pebble, sand as improved medium and soil as contrast through mixed odor of ammonia gas and hydrogen sulfide made in lab-scale. The results showed that the removal rate of H2S by different medium packed column becomes stable after 12 days, and 35 days for NH3. Pressure drop of each column meets with Equation Ergum and under the same condition the order is as follows: soil>sand>pebble>blast furnace slag. And the removal rate of each medium is: soil>sand>blast furnace slag. The soil is good for removal but its pressure drop is so high that it limits flow charge, thus its removal rate is the lowest. As a result, sand and pebble as the medium for soil deodorization considering pressure drop and the effect of deodorization were chosen. It turns out that the removal rate of NH3 is higher than 65% while H2S higher than 98%.

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The Method of Introduced Amino Group for Preparation of Thermo-Responsive Textiles

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.671.267 ◽

2015 ◽

Vol 671 ◽

pp. 267-272

Author(s):

Ju He ◽

Yue Lin Jiang ◽

Jin Dan Wu ◽

Ji Ping Wang

Keyword(s):

Low Cost ◽

Water Storage ◽

Cotton Fibers ◽

Hydroxyl Groups ◽

Amino Groups ◽

Temperature Changes ◽

Responsive Polymers ◽

Angle Measurements ◽

Contact Angle Measurements ◽

Hydrophilicity And Hydrophobicity

Thermo-responsive textile is a widely studied smart material, which finds wide application in self-adjustment, water-storage and medicine control releasing etc. Cotton is one of the mostly researched textiles due to its low cost and easy-preparation. However, it is difficult to graft thermal responsive polymers on cotton because the hydroxyl groups on the surface are not reactive enough. In this study, a dye mediate, 2-Chloro-4,6-diamino-1,3,5-triazine (CDATA) was used to introduce amino groups onto cotton fibers. NIPAAm was then grafted onto cotton by atom transfer radical polymerization (ATRP), which was measured by infrared and contact angle measurements. The obtained cotton-PNIPAAm exhibited an efficient thermal responsive performance, which was indicated by transitions between hydrophilicity and hydrophobicity reversibly according to the temperature changes.

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FABRICATION OF UNFIRED BRICKS FROM INDUSTRIAL SCHEDULED WASTE (WWTS)

Jurnal Teknologi ◽

10.11113/jt.v78.8488 ◽

2016 ◽

Vol 78 (5-2) ◽

Author(s):

Umul Masikin Othman Othman ◽

Mohamad Nidzam Rahmat

Keyword(s):

Blast Furnace Slag ◽

Low Cost ◽

Hydrated Lime ◽

Point Of View ◽

Manufacturing Industries ◽

Low Carbon ◽

Secondary Products ◽

Granulated Blast Furnace Slag ◽

Furnace Slag ◽

Leaching Procedure

Manufacturing industries produce wastes or secondary products, in which it has a direct impact to the environment. The storage of such wastes remains at the disposal would pollute the air, water resource and agricultural fields. There is a huge opportunity for recycling and it uses large quantities of wastes to minimize the environmental impact. This paper investigates the effect of utilization Wastewater Treatment sludge (WWTs) blended with Laterite Clay (LC) at 50:50 ratio to produce unfired bricks. These target materials were stabilized using Hydrated Lime (HL), Portland cement (PC) on its own and combination of Ground Granulated Blast-furnace Slag (GGBS), HL:GGBS and PC:GGBS both (50:50 and 70:30 ratio) at 10%, 20% and 30% stabilizer dosage. Compressive strength, flexural strength, thermal conductivity and toxicity characteristic leaching procedure (TCLP) test were conducted and compared with the relevant standards. It was found that it is feasible to utilize WWTs as unfired bricks from the economical and environmental point of view as it will conserve natural resource, protect the environment from waste disposal, and produce a low cost, low carbon construction components.

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Metal reduction from landfill leachate by using blast furnace slag and pine bark - discussion about the parameters significant for metal removal

Linnaeus Eco-Tech ◽

10.15626/eco-tech.2005.028 ◽

2019 ◽

pp. 277-286

Author(s):

Emma Nehrenheim

Keyword(s):

Blast Furnace ◽

Landfill Leachate ◽

Blast Furnace Slag ◽

Metal Removal ◽

Low Cost ◽

Paper Industry ◽

Filter Material ◽

Pine Bark ◽

Cost Treatment ◽

Furnace Slag

In Sweden there are many old landfills of which the content is more or less unknown, Theleachates from these are of varying quality, mirroring the waste deposited in the landfills,Metals commonly occurring in leachates are i,e, zink (Zn), lead (Pb), cupper (Cu) and nickel(Ni), Ni is of particular interest due to the un-predictable mobility of the metal, For small,weak leachates a passive low-cost treatment system can be suitable, Reactive filter technologyis one alternative and by using by-products from national and global industries theenvironmental benefit could be further increased, Pine bark (from pulp and paper industry)and blast furnace slag (from steel manufacturing) are examples of such materials, Designingfilters for removal of metals from leachate includes taking a series of parameters into accountAt the landfill site in Eskilstuna, Sweden, a facility was designed as a pilot study, Fourcolumns were filled with filter material, The materials were sand, amorphous and crystallineblast furnace slag and pine bark, The aim was to investigate parameters significant for metaluptake from landfill leachate, A screening of the metals, physio-chemical parameters andsome organic pollutants was conducted for a period of five months, A part from this, a batchexperiment was conducted, Contact time, initial concentration, other leachate components andpH are examples of parameters that have a significant influence on the metal removingcapacity of a filter,

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Preparation of a New Unburned Brick from Ti-Bearing Blast Furnace Slag and PVA Modified by Epikote

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.785-786.328 ◽

2013 ◽

Vol 785-786 ◽

pp. 328-331 ◽

Cited By ~ 3

Author(s):

Xiang Wen Kong ◽

Li Li Ren ◽

Xia Ai ◽

Jing Zhang

Keyword(s):

Blast Furnace ◽

Blast Furnace Slag ◽

Low Cost ◽

Mixing Time ◽

Cementitious Materials ◽

Test Method ◽

Process Conditions ◽

Curing Time ◽

Orthogonal Test Method ◽

Furnace Slag

A new unburned brick was prepared from the Ti-bearing blast furnace slag as an aggregate and PVA modified by epikote as cementitious materials. The effects of modified PVA and auxiliaries on compressive strength of unburned brick were studied by the orthogonal test method. The results show that samples have better properties and low cost when the samples have a composition of slag dosage 72 %, modified PVA dosage 6%, auxiliary 1 dosage 6%, auxiliary 2 dosage 10%, water 6% and the process conditions of preparing the brick sample were mixing time 1 h, forming time 10 min, forming pressure 40 MPa, and curing time 7 d. The study reveals that the samples properties can meet the standard requirements of excellent grade products (MU20) in GB11945-1999.

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A direct conversion of blast furnace slag to a mesoporous silica–calcium oxide composite and its application in CO2 captures

Green Chemistry ◽

10.1039/d0gc00722f ◽

2020 ◽

Vol 22 (12) ◽

pp. 3759-3768

Author(s):

Yasutaka Kuwahara ◽

Aiko Hanaki ◽

Hiromi Yamashita

Keyword(s):

Blast Furnace ◽

Mesoporous Silica ◽

Calcium Oxide ◽

Blast Furnace Slag ◽

Cost Effective ◽

Direct Conversion ◽

Oxide Composite ◽

Adsorption Performance ◽

Cost Effective Approach ◽

Furnace Slag

A facile and cost-effective approach is presented that converts blast furnace slag into a mesoporous silica-CaO composite possessing high CO2 adsorption performance.

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