Bioremediation of Binary System of Reactive Red 120 Dye and Cr(III) Using Aspergillus tamari and Statistical Validation of Response

Arpita Ghosh,Manisha Ghosh Dastidar,T. R. Sreekrishnan,Pradipta Patra 한국대기환경학회 2019 Asian Journal of Atmospheric Environment (AJAE) Vol.13 No.4

The efficiency of Aspergillus tamarii (isolated from sludge of a textile industry) was investigated to remediate the synthetic solutions of reactive red 120 (RR120) dye and chromium(III) separately. Also, parallel studies were conducted on the bioremediation of binary system of chromium(III) and RR120 dye in different ratios. The study was conducted to find the potential of the A. tamarii for removing chromium(III) and color from solutions containing only chromium or only RR120 dye or both and the effect of RR120 and chromium on the growth of the strain were observed. Maximum dye removal 81 mg/L was observed from 100 mg/L RR120 dye solution at pH 5 up to 50 hours. Maximum chromium removal 88.3 mg/L was observed from 100 mg/L chromium (III) solution at pH 5 up to 50 hours. In previous studies, A. tamarii was used as a bioremediator for removing different chromium complex dyes. The removal of chromium(III) and color were compared from solutions of synthetic mixtures and chromium complex dyes. The response of bioremediation study was validated using multiple regression analysis.

Cr(III)-picolinate 착물의 합성과 구조분석에 관한 연구

김성일,강대경,차기원,Kim, Sung-Il,Kang, Dae-Kyung,Cha, Ki-Won 한국분석과학회 2003 분석과학 Vol.16 No.1

Cr(III) picolinate는 생체이용성 물질로 동물이나 사람에게 필수 미네랄 크롬을 공급하는 물질로 알려져 있다. 본 연구에서는 두 가지 방법으로 Cr(III)- picolinate를 합성하고 원소분석, FT-IR, 고성능액체크로마토그래피 및 MALDI-MS 등으로 생성물 및 부산물의 순도와 구조를 확인하였다. Chromium(III) picolinate, a highly bioavailable compound, is known to be used for supplementing essential chromium(III) to human beings and animals. Two different methods were used to synthesize chromium(III) picolinate. The synthetic products were characterized by elemental analysis, FTI-IR, high performance liquid chromatography (HPLC) and MALDI-MS.

Elastomers and Composites : Research Papers ; Determination of Epoxy/Anhydride Mixing Ratio for the Highly Silica Filled Compounds with Chromium (III) Octoate Catalyst

( Noori Lee ),( Dong Hoon Lee ),( Jung Hoon Lee ),( Kyeongsik Min ),( Sung Yun Kang ),( Seungkil Seo ),( Byung Lae Rho ),( Wonho Kim ) 한국고무학회 2015 엘라스토머 및 콤포지트 Vol.50 No.2

In this study, epoxy/anhydride mixing ratio for the highly silica filled compounds with chromium (III) octoate catalyst was investigated at a low curing temperature (71°C for 40 hr) by evaluating the compressive strength with the weight ratio ranges from 0.3/1.0 to 1.0/1.0 of epoxy part (Part A)/anhydride part (Part B). In case of epoxy/anhydride compounds used surface unmodified silica by coupling agent, these compounds need excess anhydride unlike the weight ratio in the conventional epoxy/anhydride compounds. In curing behavior, the epoxy/anhydride compounds containing chromium (III) octoate showed high conversions at 71°C for 40 hr, even if a dipropylene glycol (DPG) was not used as a polymerization initiator. Also, DPG leads to a poor epoxy network structure. In conclusion, the appropriate weight ratio of Part A/Part B of highly silica filled epoxy/anhydride compounds with chromium (III) octoate catalyst is 0.5/1.0 and the maximum amounts of silica is 1470 phr of epoxy resin.

Synthesis, molecular structure, and spectroscopic properties of tris[<i>trans</i>-diazidobis(2,2-dimethylpropane-1,3-diamine)chromium(III)]bis[tertaazido(2,2-dimethylpropane-1,3-diamine)chromium(III)] perchlorate

Moon, Dohyun,Choi, Jong-Ha Elsevier 2019 Journal of molecular structure Vol.1177 No.-

<P><B>Abstract</B></P> <P>A new double complex, [<I>trans</I>-Cr(N<SUB>3</SUB>)<SUB>2</SUB>(Me<SUB>2</SUB>tn)<SUB>2</SUB>]<SUB>3</SUB>[Cr(N<SUB>3</SUB>)<SUB>4</SUB>(Me<SUB>2</SUB>tn)]<SUB>2</SUB>ClO<SUB>4</SUB> (Me<SUB>2</SUB>tn = 2,2-dimethylpropane-1,3-diamine), was prepared, and its structure determined through single-crystal X-ray diffraction at 100 K. The complex crystallizes in the space group <I>C</I>2/<I>c</I> of the monoclinic system with <I>a</I> = 34.255 (7), <I>b</I> = 11.067 (2), <I>c</I> = 24.137 (5) Å, and <I>β</I> = 120.64 (3)<SUP>o</SUP>. The asymmetric unit contains one half of a centrosymmetric <I>trans</I>-<I>anti</I>-[Cr(N<SUB>3</SUB>)<SUB>2</SUB>(Me<SUB>2</SUB>tn)<SUB>2</SUB>]<SUP>+</SUP> cation, one independent <I>trans</I>-<I>syn</I>-[Cr(N<SUB>3</SUB>)<SUB>2</SUB>(Me<SUB>2</SUB>tn)<SUB>2</SUB>]<SUP>+</SUP> cation, one <I>cis</I>-[Cr(N<SUB>3</SUB>)<SUB>4</SUB>(Me<SUB>2</SUB>tn)]<SUP>-</SUP> anion, and one half of a perchlorate anion. In two independent complex cations, the Cr<SUP>III</SUP> ions are each coordinated by four N atoms of two chelating Me<SUB>2</SUB>tn and two N atoms of the azido group in a distorted octahedral geometry, whereas the Cr<SUP>III</SUP> ion in <I>cis</I>-[Cr(N<SUB>3</SUB>)<SUB>4</SUB>(Me<SUB>2</SUB>tn)]<SUP>-</SUP> has a distorted octahedral coordination with two N atoms of one Me<SUB>2</SUB>tn and four N atoms of the azido group. Interestingly, the six-membered rings in two <I>trans</I>-[Cr(N<SUB>3</SUB>)<SUB>2</SUB>(Me<SUB>2</SUB>tn)<SUB>2</SUB>]<SUP>+</SUP> cations adopt <I>anti</I> and <I>syn</I> chair-chair conformations, independently. The CrN (Me<SUB>2</SUB>tn) bond lengths vary from 2.0556 (15) to 2.0992 (19) Å, whereas the CrN (azido) bond lengths range from 2.0205 (16) to 2.0428 (16) Å. The perchlorate anion is disordered over two sets of sites, and has a distorted tetrahedral geometry. The crystal lattice is stabilized through hydrogen bonding interactions between the nitrogen of N<SUB>3</SUB> <SUP>−</SUP> and the NH groups of the Me<SUB>2</SUB>tn ligand. The IR and electronic absorption spectral properties are also discussed herein.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of a new double chromium (III) complex with azido groups. </LI> <LI> Structural determination from synchrotron X-ray radiation data. </LI> <LI> Description of spectral properties by IR and electronic absorption spectroscopy. </LI> </UL> </P>

Removal of Chromium by Activated Carbon Fibers Plated with Copper Metal

Park, Soo-Jin,Jung, Woo-Young Korean Carbon Society 2001 Carbon Letters Vol.2 No.1

In this work, activated carbon fibers (ACFs) were plated with copper metal using electroless plating method and the effects of surface properties and pore structures on chromium adsorption properties were investigated. Surface properties of ACFs have been characterized using pH and acid/base values. BET data with $N_2$ adsorption were used to obtain the structural parameters of ACFs. The electroless copper plating did significantly lead to a decrease in the surface acidity or to an increase in the surface basicity of ACFs. However, all of the samples possessed a well-developed micropore. The adsorption capacity of Cr(III) for the electroless Cu-plated ACFs was higher than that of the as-received, whereas the adsorption capacity of Cr(VI) for the former was lower than that of the latter. The adsorption rate constants ($K_1$, $K_2$, and $K_3$) were also evaluated from chromium adsorption isotherms. It was found that $K_1$ constant for Cr(III) adsorption depended largely on surface basicity. The increase of Cr(III) adsorption and the decrease of Cr(VI) adsorption were attributed to the formation of metal oxides on ACFs, resulting in increasing the surface basicity.

Removal of Chromium by Activated Carbon Fibers Plated with Copper Metal

Soo-Jin Park,Woo-Young Jung 한국탄소학회 2001 Carbon Letters Vol.2 No.1

In this work, activated carbon fibers (ACFs) were plated with copper metal using electroless plating method and the effects of surface properties and pore structures on chromium adsorption properties were investigated. Surface properties of ACFs have been characterized using pH and acid/base values. BET data with N2 adsorption were used to obtain the structural parameters of ACFs. The electroless copper plating did significantly lead to a decrease in the surface acidity or to an increase in the surface basicity of ACFs. However, all of the samples possessed a well-developed micropore. The adsorption capacity of Cr(III) for the electroless Cu-plated ACFs was higher than that of the as-received, whereas the adsorption capacity of Cr(VI) for the former was lower than that of the latter. The adsorption rate constants (K1, K2, and K3) were also evaluated from chromium adsorption isotherms. It was found that K1 constant for Cr(III) adsorption depended largely on surface basicity. The increase of Cr(III) adsorption and the decrease of Cr(VI) adsorption were attributed to the formation of metal oxides on ACFs, resulting in increasing the surface basicity.

Electronic Spectroscopy and Ligand Field Analysis of mer-Chloro(1,2-ethanediamine)(1,5,9-triazanonane)chromium(III) Tetrachlorzincate(II)

Park, Jong-Ha,Park, Yu-Chul,Kim, Hag-Sung Korean Society of Photoscience 2000 Journal of Photosciences Vol.7 No.3

The 77 K emission and excitation spectra, and 298 K infrared and absorption spectra of mer-[CrCl(en)(dpt)]ZnCl$_4$(en=1,2-diaminoethane; dpt=1,5,9-triazanonane) have been measured. Ligand field electronic transitions due to spin-allowed and spin-forbidden are assigned. The zero-phonon line in the excitation spectrum splits into two components by 151$cm^{-1}$ /, and large$^2$E$^{g}$ splitting can be reproduced by the modern ligand field theory. It is confirmed that nitrogen atoms of the en and dpt ligands have a strong $\delta$-donor character, but chloride ligand has weak $\delta$-and $\pi$-donor properties toward chromium(III) ion.

Study on the removal of chromium(III) from leather waste by a two-step method

Li Wang,Jun Liu,Yang Jin,Ming Chen,JianHong Luo,Xinhua Zhu,Yuqiang Zhang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-

The removal of chromium(III) from leather solid waste was carried out by two steps: the leaching stepand the ion exchange step. Orthogonal method was applied to the leaching process with H2SO4 asleaching agent and the leaching rate was nearly 100%. The adsorption and desorption of Cr3+ with 732#cation exchange resins were investigated in the ion exchange process. The effects of the resin types,temperature, rotating speed, liquid-solid ratio, initial Cr3+ concentration and time were investigated andthe optimum conditions were as follows: 732#, 333 K, 120 r/min, 20 ml/g, 280 ppm and 5 h. The removalefficiency of Cr3+ from leather hydrolysate was over 95% under optimized conditions. The desorptionefficiency of Cr3+ from loaded resins was almost 99% by three times cross-flow with Na2SO4 solution. There-adsorption of Cr3+ could achieve 95% by regenerated resins. The adsorption isotherms, kinetics andthermodynamics of Cr3+ onto 732# resins were investigated. The adsorption process appeared to followLangmuir isotherm model and the pseudo-second-order kinetic model. 4H0 = 33,816.03 kJ/mol and4S0 = 141.35 J/(mol K) were calculated. The two-step method was proved to be a sustainable andeconomic method for separating chromium from leather waste.

Photoemission and Excitation Spectroscopy of cis-Difluoro(1,4,8,11-Tetraazacyclotetradecane) Chromium (III) Perchlorate

Park, Jong-Ha,Hong, Yong-Pyo,Park, Yu-Chul,Ryoo, Keon-Sang Korean Society of Photoscience 2000 Journal of Photosciences Vol.7 No.1

The photoemission and excitation spectra of cis-[Cr(cyclam)F$_2$]ClO$_4$ (cyclam = 1,4,8,11-tetraazacy-clotetradecane) taken at 77 K are reported. The 298 K mid- and far-infrared spectra are also measured. The vibrational intervals of the electronic ground state are extracted from the far-infrared and emission spectra. The ten electronic bands due to spin-allowed and spin-forbidden transitions are assigned. The zero-phonon line In the excitation spectrum splits into two components by 169 cm$^{1}$, and the large $^2$E$_{g}$ splitting can be reproduced by the ligand field theory. According to the ligand field analysis, we can confirm that nitrogen atoms of the cyclam ligand have a strong c-donor character, and fluoride ligand also has strong $\sigma$- and $\pi$-donor properties toward chromium(III) ion.n.

Modeling of facilitated transport of Cr(III) using (RNH3+HSO4-) ionic liquid and pseudo-emulsion hollow fiber strip dispersion (PEHFSD) technology

F.J. Alguacil,I. Garcia-Diaz,F.A. Lopez 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4

The permeation of chromium (III) using PEHFSD technology and the ionic liquid (RNH3+HSO4), formed by reaction of the primary amine PRIMENE JMT and sulphuric acid, dissolved in n-decane as mobile carrier has been investigated. The alkaline feed solution containing Cr(III) was passed through the tube side, and pseudo-emulsions of the ionic liquid + n-decane + n-decanol and sulphuric acid were passed through the shell side in counter-current mode and using a single hollow fiber module for extraction and stripping. In this advanced membrane technology, the aqueous acidic strip solution is dispersed in the organic membrane solution in a tank with an impeller stirrer to form a strip dispersion. The pseudoemulsion phase is circulated from the tank to the membrane module to provide a constant supply of the organic solution to the membrane micropores. Factors affecting chromium permeability, such as hydrodynamic conditions, carrier concentration in the organic phase, metal and NaOH concentrations in the feed phase, have been analyzed. A model is reported describing the transport mechanism, whereas the experimental data are quantitatively explained by mathematical equations describing the rate of transport. Different rate-controlling processes take place as long as the metal transport occurs.