Reduction of Lead and Antimony Ions from the Crystal Glass Wastewaters Utilising Adsorption

The presented research examined five adsorbents, i.e., zeolite 4A, a mixture of three zeolites (4A, 13X, and ZSM-5), natural zeolite (tuff), activated carbon, and peat, and their potential capability for removal of exceeded ions of lead (Pb), antimony (Sb), sulphates (SO42−), and fluorides (F−) from real wastewater generated in the crystal glass industry, which was previously treated in-situ by flocculation, with the aim to attain the statutory values for discharge into watercourses or possible recycling. The screening experiment evidenced that the tuff was the most suitable adsorbent for the reduction of Pb (93.8%) and F− (98.1%). It also lowered wastewater’s pH sufficiently from 9.6 to 7.8, although it was less appropriate for the reduction of Sb (66.7%) as compared to activated carbon (96.7%) or peat (99.9%). By adjusting the pH of the initial wastewater to pH 5, its adsorption capacity even enlarged. Results from the tuff-filled column experiment revealed reduction of Pb up to 97%, Sb up to 80%, and F− up to 96%, depending on the velocity flow, and thus it could be used for post-treatment (and recycling) of wastewaters from the crystal glass industry. Moreover, the system showed an explicit buffering capacity, but negligible reduction of the SO42−.

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Reviewing Fundamental CO2 Adsorption Characteristics of Zeolite and Activated Carbon by In-situ Measurements With Radioactively Labelled CO2

Separation and Purification Reviews ◽

10.1080/15422119.2021.1934699 ◽

2021 ◽

pp. 1-12

Author(s):

Yimin Deng ◽

Jonathan Peter Kyle Seville ◽

Sarah Dawn Bell ◽

Andrew Ingram ◽

Huili Zhang ◽

...

Keyword(s):

Activated Carbon ◽

Co2 Adsorption ◽

In Situ Measurements ◽

Adsorption Characteristics

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Sulfur-anchored palm shell waste-based activated carbon for ultrahigh sorption of Hg(II) for in-situ groundwater treatment

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2021.125995 ◽

2021 ◽

pp. 125995

Author(s):

So Yeon Yoon ◽

Seok Byum Jang ◽

Kien Tiek Wong ◽

Hyeseong Kim ◽

Min Ji Kim ◽

...

Keyword(s):

Activated Carbon ◽

Groundwater Treatment ◽

Palm Shell ◽

Shell Waste

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In Situ Fabrication of Activated Carbon from a Bio-Waste Desmostachya bipinnata for the Improved Supercapacitor Performance

Nanoscale Research Letters ◽

10.1186/s11671-021-03545-8 ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Gopal Krishna Gupta ◽

Pinky Sagar ◽

Sumit Kumar Pandey ◽

Monika Srivastava ◽

A. K. Singh ◽

...

Keyword(s):

Activated Carbon ◽

Energy Density ◽

Power Density ◽

Supercapacitor Electrode ◽

In Situ Fabrication ◽

Transmission Electron ◽

Good Energy ◽

Supercapacitor Performance ◽

Operating Potential

AbstractHerein, we demonstrate the fabrication of highly capacitive activated carbon (AC) using a bio-waste Kusha grass (Desmostachya bipinnata), by employing a chemical process followed by activation through KOH. The as-synthesized few-layered activated carbon has been confirmed through X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy techniques. The chemical environment of the as-prepared sample has been accessed through FTIR and UV–visible spectroscopy. The surface area and porosity of the as-synthesized material have been accessed through the Brunauer–Emmett–Teller method. All the electrochemical measurements have been performed through cyclic voltammetry and galvanometric charging/discharging (GCD) method, but primarily, we focus on GCD due to the accuracy of the technique. Moreover, the as-synthesized AC material shows a maximum specific capacitance as 218 F g−1 in the potential window ranging from − 0.35 to + 0.45 V. Also, the AC exhibits an excellent energy density of ~ 19.3 Wh kg−1 and power density of ~ 277.92 W kg−1, respectively, in the same operating potential window. It has also shown very good capacitance retention capability even after 5000th cycles. The fabricated supercapacitor shows a good energy density and power density, respectively, and good retention in capacitance at remarkably higher charging/discharging rates with excellent cycling stability. Henceforth, bio-waste Kusha grass-derived activated carbon (DP-AC) shows good promise and can be applied in supercapacitor applications due to its outstanding electrochemical properties. Herein, we envision that our results illustrate a simple and innovative approach to synthesize a bio-waste Kusha grass-derived activated carbon (DP-AC) as an emerging supercapacitor electrode material and widen its practical application in electrochemical energy storage fields.

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