Simultaneous Recovery of Gold and Iodine from the Waste Rinse Water of the Semiconductor Industry Using Activated Carbon

Nguyen, Nghiem V.; Jeong, Jaeseung; Shin, Dong Ju; Kim, Byung-Su; Lee, Jae-chun; Pandey, B.D.

doi:10.2320/matertrans.m2012009

Cited by 47 publications

(20 citation statements)

References 21 publications

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“…For the HKUST‐1@PES in particular, after 25 min, almost 95% of I 2 from a 1.0 × 10 −3 m starting solution was adsorbed; the calculated uptake was found to be 720 mg g −1 composite (1028 mg g −1 HKUST‐1 ). This value is higher than the uptake of 330 mg g −1 composite (measured after 96 h of adsorption) reported for the ZIF‐8@PU nanocomposite membrane and comparable to the maximum I 2 uptake of activated carbon adsorbents (835 mg g −1 material , measured after 6 h) . The variation in the adsorption rate with different polymers suggests that in a suitable polymer matrix such as PES, the I 2 molecules can diffuse easily through the pockets and reach the HKUST‐1 crystals faster.…”

Section: Resultssupporting

confidence: 51%

Porous Metal–Organic Framework@Polymer Beads for Iodine Capture and Recovery Using a Gas‐Sparged Column

Valizadeh

Nguyen

Smit

et al. 2018

Adv Funct Materials

144

102

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Iodine (I 2 ) capture and recovery is an important process in many industrial practices. Conventional materials for I 2 capture include Ag 0 -based aerogels and zeolites and C-based aerogels and powders, which suffer from expensive and/or inefficient recovery. Recently, metal-organic frameworks (MOFs) have shown potential as good adsorbents for I 2 capture with high capacity, fast uptake, and good recyclability. The powder form of MOFs, however, often makes them impractical in large-scale applications. Herein, a versatile method based on the phase inversion technique is presented to fabricate millimetersized spherical MOF@polymer composite beads, and the use of these beads for I 2 capture and recovery is demonstrated. Besides preserving the crystallinity and pore accessibility of the embedded MOFs in the polymeric matrix, the beads exhibit higher capacity and faster uptake rate for I 2 in both vapor and liquid phases compared to the bulk MOF powder. In order to showcase the applicability of these beads, a gas-sparged column is used as a proof-ofconcept device that can efficiently capture and recover more than 99% of I 2 from the feeding solution. The beads can be recycled and reused multiple times, which in combination with their easy handling and storage highlights their superiority compared to MOF powders in adsorption applications.

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Section: Resultssupporting

confidence: 51%

Porous Metal–Organic Framework@Polymer Beads for Iodine Capture and Recovery Using a Gas‐Sparged Column

Valizadeh

Nguyen

Smit

et al. 2018

Adv Funct Materials

144

102

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“…In addition, a number of methods [55,56] have been developed for iodine-based etchants which allow gold recovery and etch regeneration so the sustainability of the process is good.…”

Section: Aqueous Etchantsmentioning

confidence: 99%

Gold etching for microfabrication

2014

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The etching of gold is a key enabling technology in the fabrication of many microdevices and is widely used in the electronic, optoelectronic and microelectromechanical systems (MEMS) industries. In this review, we examine some of the available methods for patterning gold thin films using dry and wet etching techniques. Dry methods which utilise reactive ion etching (RIE) have a number of important advantages over other methods, but the low volatility of gold etch products has made the development of suitable processes problematic. More recently, the adoption of high-density plasma reactors with optimised chlorine-based chemistries has allowed improved processes to be developed, and etching in hydrogen plasmas also shows promise. Wet etching methods for gold have also been critically reviewed. Traditionally, iodine-and cyanide-based etch processes have been used, but in the last decade, a number of alternative etchants have been studied. Of particular interest is the recent development of a range of novel nonaqueous-based gold etchants, and the suitability of these etchants for microfabrication is assessed.

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“…[ 11 ] Adsorption is considered to be the most effective iodine capture method among those ones owing to its simple equipment operation, low energy consumption, and fast mass transfer speed. Recently, various organic and inorganic adsorbents have been used in the field of iodine capture, including activated carbon (AC), [ 12,13 ] inorganic porous materials, [ 14,15 ] and metal organic frameworks (MOFs). [ 16,17 ] However, their low efficiency, poor moisture stabilities, and high cost still limit these materials from practical iodine capture.…”

Section: Methodsmentioning

confidence: 99%

High‐Yield Synthesis of Pyridyl Conjugated Microporous Polymer Networks with Large Surface Areas: From Molecular Iodine Capture to Metal‐Free Heterogeneous Catalysis

Zuo

Lyu

Zhang

et al. 2020

Macromol. Rapid Commun.

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Capturing volatile radioactive nuclides including iodine (I129 or I131) is one of the major problems to be solved for environmental sustainability. Multiple types of functional microporous materials such as metal organic frameworks and covalent organic frameworks have been constructed for iodine emission control. However, most of the microporous materials are limited by their weak binding force with iodine and low stability, leading to low capture efficiencies. Herein, the synthesis of pyridyl conjugated microporous polymer networks with large surface areas (PCMP‐Y) up to 1304 m2 g−1 and high yields up to 95% via a simple Yamamoto cross‐coupling reaction, is reported. The PCMP‐Y carries amine and pyridine N groups which have stronger interactions with iodine molecules. The high specific surface areas and porosities of PCMP‐Y facilitate iodine capture, delivering a maximum adsorption capacity of 4.75 g g−1 in a short time (3 h), which is superior to a majority of porous materials reported. Moreover, the reversible desorption nature of PCMP‐Y capturing iodine imparts a platform for metal‐free heterogeneous catalyst, which can be applied to synthesize aminobenzothiazole medicines via O2‐promoted cascade reactions.

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Simultaneous Recovery of Gold and Iodine from the Waste Rinse Water of the Semiconductor Industry Using Activated Carbon

Cited by 47 publications

References 21 publications

Porous Metal–Organic Framework@Polymer Beads for Iodine Capture and Recovery Using a Gas‐Sparged Column

Porous Metal–Organic Framework@Polymer Beads for Iodine Capture and Recovery Using a Gas‐Sparged Column

Gold etching for microfabrication

High‐Yield Synthesis of Pyridyl Conjugated Microporous Polymer Networks with Large Surface Areas: From Molecular Iodine Capture to Metal‐Free Heterogeneous Catalysis

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