A. V. Singh

Synthesis, Characterization, and Applications of a New Ion Exchanger Tamarind 4-aminobenzoic Acid (TABA) Resin in Industrial Wastewater Treatment

Chromatographic column separations of toxic metal ions from industrial wastewater were achieved in acid media at optimized (Kd) values with a synthesized cation exchange TABA resin. The prepared TABA resin was characterized by FTIR, elemental, and thermogravimetric analysis. Studies of total ion exchange capacity, resin durability, and swelling were carried out. The distribution coefficient values of metal ions, viz Cu2+, Fe2+, Zn2+, Cd2+ and Pb2+ at different pH, were also studied using a batch equilibration method. The different factors affecting metal ions adsorption on this substrate, such as treatment time, agitation speed, and temperature, were studied in detail.

Design, Synthesis, Application and Recovery of Guar Gum 5-Amino Salicylic Acid Hydroximate [GASAH] Resin for Selective Separation and Determination of Trace and Heavy Metal Ions

The ion exchange method is applied for removal of heavy metal ions from industrial wastewater and determines the applicability of synthesized guar gum 5-amino salicylic acid hydroximate (GASAH) resin. The effect of experimental parameters such as pH, agitation speed, contact time, adsorbent dose and flow rate on the removal of metal ions has been studied. Fourier-transform infrared spectrum and elemental analysis were used to determine the physiochemical properties of this resin. The GASAH behaves as a monofunctional acid with ion-exchange capacity of 4.26 meq/g for metal ions. The distribution coefficients of heavy metal ions were determined at different pHs.

Synthesis and characterization of an ion exchanger based on tamarind kernel powder and its application for removal of some metal ions from industrial effluents

A resin synthesized from tamarind kernel powder possesses high selectivity for metal ions. Distribution coefficients for some metal ions has been determined by the batch method. The influence of pH on ion exchange capacity and K d value of metal ions were studied. The resin has been characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, chemical composition and ion exchange capacity (IEC). The selectivity order is Pb2+ > Cu2+ > Fe2+ > Zn2+ > Ni2+. Removal of metal ions from the aqueous solution and from effluents of a steel mill has been studied.

A novel finding of oligodontia and ankyloglossia in a 14‐year‐old with Floating‐Harbor syndrome

Floating-Harbor syndrome (FHS) is a rare genetic condition characterized by distinct facial features, short stature and delayed skeletal development. Here we present case of a 14-year-old boy with short stature, typical facial features, impaired voice quality, clinodactyly, cryptorchidism and unilateral agenesis of kidney. In addition he had oligodontia and ankyloglossia with features suggestive of FHS. Treatment rendered was restoration of caries, application of pit and fissure sealants followed by frenectomy. The purpose of this report is to highlight the oral developmental anomalies and the management of a patient with FHS and to add to the current knowledge of the literature on this syndrome.

Coexistence of fusion and concrescence of primary teeth: in a child with Down syndrome: FUSION AND CONCRESCENCE OF TEETH: DOWN SYNDROME

Down syndrome is one of the most common congenital anomaly. It is most frequently caused by trisomy of chromosome 21. Other causes can be mosaicism and translocation. Such patients are commonly encountered in routine dental practice. This syndrome has wide range of medical and dental abnormalities. This paper presents a unique case of fusion and concrescence of retained primary teeth in a child with Down syndrome. The incidence of such anomalies is quite low in these cases. Thus, a better awareness of such conditions on part of a dental practitioner will aid in the provision of enhanced dental care to these patients.

Infected Dental Follicle Secondary to Mandibular Parasymphyseal Fracture: A Case Report.

Mandibular fractures are one of the most common maxillofacial traumatic injuries. They are also reported to be associated with highest rate of post-operative infection. In mixed dentition, management of tooth buds in line of fracture present great challenge to the surgeon. Timely management and non-invasive techniques can help in alleviating complications associated with fractures in children. Such cases should be kept on long-term follow-up for evaluation of proper growth and development. This case report documents a child having a history of previous mandibular fracture and extra-oral sinus tract associated with infected dental follicle.

Synthesis, characterization and applications of a new cation exchanger tamarind sulphonic acid (TSA) resin

A new composite cation exchanger, tamarind sulphonic acid (TSA) resin has been synthesized. The chemically modified TSA ion exchange resin has been used for the removal and preconcentration of Zn2+, Cd2+, Fe2+, Co2+ and Cu2+ ions in aqueous solution and effluent from the Laxmi steel plant in Jodhpur, India. This type of composite represents a new class of hybrid ion exchangers with good ion exchange capacity, stability, reproducibility and selectivity for toxic metal ions found in effluent from the steel industry. The characterization of the resin was carried out by determining the ion-exchange capacity, elemental analysis, pH titration, Fourier transform infrared spectra and thermal analysis. The distribution coefficients (K d ) of toxic metal ions were determined in a reference aqueous solution and the steel plant effluent at different pH values; the absorbency of different metal ions on the TSA resin was studied for up to 10 cycles. The adsorption of different metal ions on TSA resin follows the order: Co2+>Cu2+>Zn2+>Fe2+>Cd2+. The ion exchange capacity of TSA resin is 2.87%.

Synthesis and Characterization of a New Ion Exchanger Tamarind 5‐Amino Salicylic Acid Hydroximate [TASAH] Resin and Its Application in Removal and Recovery of Toxic Metal Ions from Effluent of Karishma Textile, Jodhpur, India

A new composite ion exchanger tamarind 5‐amino salicylic acid hydroximate [TASAH] resin was synthesized for removal of toxic metal ions, which have good ion‐exchange capacity, higher stability, reproducibility and selectivity. The characterization of the resin was carried out by determining the ion exchange capacity, elemental analysis, pH titration, FT‐IR spectra and thermal analysis (TGA). The distribution coefficients (Kd) of toxic metal ions were determined in aqueous solution and effluent of Karishma Textile at different pH. On the other hand, physical property of TASAH resin was also studied. The effects of pH, agitation speed, treatment time, flow rate, contact time, temperature and adsorbent dose, on the removal of metal ions from industrial wastewater were investigated. The adsorbed metal ions were effectively eluted by different strength of acid solution. The resin is amenable for continuous process and can be regenerated several times. The adsorption of different metal ions on TASAH resin follo...