Search

An increasing textile industry has exacerbated the serious problem of dealing with industrial effluent that contains toxic dye molecules. Despite the development of various techniques for adsorbing dyes in wastewater, many researchers have yet to expand a highly efficient technique for the revival of dye molecules from textile waste water. However, adsorption techniques using low cost, eco-friendly, effective adsorbents are extensively used due to their simplicity and good efficiency. A novel approach for the capture of dye molecules using a composite inexpensive activated carbon (AC) adsorbent synthesized from Gulmohar (GM) plant seeds has been proposed in this study. Prepared AC before and after adsorption of Methyl Orange (MO) has been characterized by SEM, EDX and FT-IR. Experimental adsorption data of chosen anionic dyes fits several kinetic and isotherm models. Kinetic studies reveal that a pseudo-second order is the mainly suitable model in the adsorption process. The equilibrium adsorption data of anionic dye show that the system followed the Langmuir adsorption isotherm. In addition, through thermodynamic calculations the negative value of ΔG° and negative value of ΔH° show that the adsorption is a spontaneous and exothermic process. All the above results conclude that the GMAC can be used as an effective absorbent for removing dyes from wastewater. [ABSTRACT FROM AUTHOR]

Reticulate pigmentary dyschromatoses primarily include dyschromatosis universalis hereditaria (DUH), dyschromatosis symmetrica hereditaria (DSH) (Reticulate acropigmentation of Dohi), and unilateral dermatomal pigmentary dermatosis, which differ in their patterns of distribution. The disease was initially described by Ichikawa and Hiraga in Germany in 1933. The prevalence of DUH is 0.3 per 100,000 with a female preponderance. The skin lesions usually appear in infancy or early childhood and cease to progress beyond adolescence. The subtypes DUH 1 and DUH 3 are found to have autosomal dominant inheritance, which is the most common inheritance pattern, while DUH 2 has an autosomal recessive pattern. The most common gene involved in DUH is ABCB6, while the other genes include SASH 1, PER 3, and KITLG (DUH type 2). DUH is characterized by multiple irregular hyperpigmented macules interspersed with hypopigmented macules in a mottled pattern over the trunk and extremities. The face is involved in 50% of individuals. Rarely, it can also involve hairs, nails, mucous membranes, palms, and soles. Other varied presentations include localized forms, localization of lesions to sun-exposed areas, large macules, uniform palmar hypopigmentation, diffuse hyperpigmentation with spotty depigmented macules, and unilateral involvement. DUH has been reported to be associated with various cutaneous and systemic diseases. The authors have observed cases of DUH associated with hepatocellular carcinoma, solitary keratoacanthoma, and dermoid cyst. The various diagnostic modalities include dermoscopy, histopathology, electron microscopy, and targeted gene sequencing. Though various treatment modalities like NBUVB and lasers have been tried, no treatment is promising., (© 2023 the International Society of Dermatology.)